idf_tools.py

#!/usr/bin/env python
# coding=utf-8
#
# SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
#
# SPDX-License-Identifier: Apache-2.0
#
# This script helps installing tools required to use the ESP-IDF, and updating PATH
# to use the installed tools. It can also create a Python virtual environment,
# and install Python requirements into it.
#  It does not install OS dependencies. It does install tools such as the Xtensa
#  GCC toolchain and ESP32 ULP coprocessor toolchain.
#
# By default, downloaded tools will be installed under $HOME/.espressif directory
# (%USERPROFILE%/.espressif on Windows). This path can be modified by setting
# IDF_TOOLS_PATH variable prior to running this tool.
#
# Users do not need to interact with this script directly. In IDF root directory,
# install.sh (.bat) and export.sh (.bat) scripts are provided to invoke this script.
#
# Usage:
#
# * To install the tools, run `idf_tools.py install`.
#
# * To install the Python environment, run `idf_tools.py install-python-env`.
#
# * To start using the tools, run `eval "$(idf_tools.py export)"` — this will update
#   the PATH to point to the installed tools and set up other environment variables
#   needed by the tools.
import argparse
import contextlib
import copy
import datetime
import errno
import fnmatch
import functools
import hashlib
import json
import os
import platform
import re
import shutil
import ssl
import subprocess
import sys
import tarfile
import tempfile
import time
from collections import namedtuple
from collections import OrderedDict
from json import JSONEncoder
from ssl import SSLContext
from tarfile import TarFile
from zipfile import ZipFile

# Important notice: Please keep the lines above compatible with old Pythons so it won't fail with ImportError but with
# a nice message printed by python_version_checker.check()
try:
    import python_version_checker

    # check the Python version before it will fail with an exception on syntax or package incompatibility.
    python_version_checker.check()
except RuntimeError as e:
    print(e)
    raise SystemExit(1)

from typing import IO, Any, Callable, Dict, Iterator, List, Optional, Set, Tuple, Union
from urllib.error import ContentTooShortError
from urllib.parse import urljoin, urlparse
from urllib.request import urlopen
from urllib.response import addinfourl

try:
    from exceptions import WindowsError
except ImportError:
    # Unix
    class WindowsError(OSError):  # type: ignore
        pass


TOOLS_FILE = 'tools/tools.json'
TOOLS_SCHEMA_FILE = 'tools/tools_schema.json'
TOOLS_FILE_NEW = 'tools/tools.new.json'
IDF_ENV_FILE = 'idf-env.json'
TOOLS_FILE_VERSION = 2
IDF_TOOLS_PATH_DEFAULT = os.path.join('~', '.espressif')
UNKNOWN_VERSION = 'unknown'
SUBST_TOOL_PATH_REGEX = re.compile(r'\${TOOL_PATH}')
VERSION_REGEX_REPLACE_DEFAULT = r'\1'
IDF_MAINTAINER = os.environ.get('IDF_MAINTAINER') or False
TODO_MESSAGE = 'TODO'
DOWNLOAD_RETRY_COUNT = 3
URL_PREFIX_MAP_SEPARATOR = ','
IDF_TOOLS_INSTALL_CMD = os.environ.get('IDF_TOOLS_INSTALL_CMD')
IDF_TOOLS_EXPORT_CMD = os.environ.get('IDF_TOOLS_INSTALL_CMD')
IDF_DL_URL = 'https://dl.espressif.com/dl/esp-idf'
IDF_PIP_WHEELS_URL = os.environ.get('IDF_PIP_WHEELS_URL', 'https://dl.espressif.com/pypi')
PYTHON_VENV_DIR_TEMPLATE = 'idf{}_py{}_env'
PYTHON_VER_MAJOR_MINOR = f'{sys.version_info.major}.{sys.version_info.minor}'
VENV_VER_FILE = 'idf_version.txt'


class GlobalVarsStore:
    """
    Pythonic way how to handle global variables.
    One global instance of this class is initialized and used as an entrypoint (store)
    It handles string and boolean properties.
    """
    _instance: Optional['GlobalVarsStore'] = None
    _bool_properties = ['quiet', 'non_interactive']
    _string_properties = ['idf_path', 'idf_tools_path', 'tools_json']

    def __new__(cls, *args: Any, **kwargs: Any) -> 'GlobalVarsStore':
        if not cls._instance:
            cls._instance = super(GlobalVarsStore, cls).__new__(cls, *args, **kwargs)
            cls._instance._initialize_properties()
        return cls._instance

    def _initialize_properties(self) -> None:
        # Initialize boolean properties to False
        for prop in self._bool_properties:
            setattr(self, f'_{prop}', False)
        # Initialize string properties to None
        for prop in self._string_properties:
            setattr(self, f'_{prop}', None)

    def __getattr__(self, name: str) -> Any:
        if name in self._bool_properties + self._string_properties:
            value: Union[str, bool] = getattr(self, f'_{name}')
            if value is None and name in self._string_properties:
                raise ReferenceError(f'Variable {name} accessed before initialization.')
            return value
        raise AttributeError(f'{name} is not a valid attribute')

    def __setattr__(self, name: str, value: Any) -> None:
        if name in self._bool_properties + self._string_properties:
            super().__setattr__(f'_{name}', value)
        else:
            super().__setattr__(name, value)


g = GlobalVarsStore()


def fatal(text: str, *args: str) -> None:
    """
    Writes ERROR: + text to sys.stderr.
    """
    if not g.quiet:
        sys.stderr.write(f'ERROR: {text}\n', *args)


def warn(text: str, *args: str) -> None:
    """
    Writes WARNING: + text to sys.stderr.
    """
    if not g.quiet:
        sys.stderr.write(f'WARNING: {text}\n', *args)


def info(text: str, f: Optional[IO[str]]=None, *args: str) -> None:
    """
    Writes text to a stream specified by second arg, sys.stdout by default.
    """
    if not g.quiet:
        if f is None:
            f = sys.stdout
        f.write(f'{text}\n', *args)


def print_hints_on_download_error(err: str) -> None:
    """
    Prints hint on download error. Tries to specify the message depending on the error.
    """
    info('Please make sure you have a working Internet connection.')

    if 'CERTIFICATE' in err:
        info('Certificate issues are usually caused by an outdated certificate database on your computer.')
        info('Please check the documentation of your operating system for how to upgrade it.')

        if sys.platform == 'darwin':
            info('Running "./Install\\ Certificates.command" might be able to fix this issue.')

        info(f'Running "{sys.executable} -m pip install --upgrade certifi" can also resolve this issue in some cases.')

    # Certificate issue on Windows can be hidden under different errors which might be even translated,
    # e.g. "[WinError -2146881269] ASN1 valor de tag inválido encontrado"
    if sys.platform == 'win32':
        info('By downloading and using the offline installer from https://dl.espressif.com/dl/esp-idf '
             'you might be able to work around this issue.')


PYTHON_PLATFORM = f'{platform.system()}-{platform.machine()}'

# Identifiers used in tools.json for different platforms.
PLATFORM_WIN32 = 'win32'
PLATFORM_WIN64 = 'win64'
PLATFORM_MACOS = 'macos'
PLATFORM_MACOS_ARM64 = 'macos-arm64'
PLATFORM_LINUX32 = 'linux-i686'
PLATFORM_LINUX64 = 'linux-amd64'
PLATFORM_LINUX_ARM32 = 'linux-armel'
PLATFORM_LINUX_ARMHF = 'linux-armhf'
PLATFORM_LINUX_ARM64 = 'linux-arm64'


class Platforms:
    """
    Mappings from various other names these platforms are known as, to the identifiers above.
    This includes strings produced from "platform.system() + '-' + platform.machine()", see PYTHON_PLATFORM
    definition above.
    """
    # Mappings from various other names these platforms are known as, to the identifiers above.
    # This includes strings produced from "platform.system() + '-' + platform.machine()", see PYTHON_PLATFORM
    # definition above.
    # This list also includes various strings used in release archives of xtensa-esp32-elf-gcc, OpenOCD, etc.
    PLATFORM_FROM_NAME = {
        # Windows
        PLATFORM_WIN32: PLATFORM_WIN32,
        'Windows-i686': PLATFORM_WIN32,
        'Windows-x86': PLATFORM_WIN32,
        'i686-w64-mingw32': PLATFORM_WIN32,
        PLATFORM_WIN64: PLATFORM_WIN64,
        'Windows-x86_64': PLATFORM_WIN64,
        'Windows-AMD64': PLATFORM_WIN64,
        'x86_64-w64-mingw32': PLATFORM_WIN64,
        'Windows-ARM64': PLATFORM_WIN64,
        # macOS
        PLATFORM_MACOS: PLATFORM_MACOS,
        'osx': PLATFORM_MACOS,
        'darwin': PLATFORM_MACOS,
        'Darwin-x86_64': PLATFORM_MACOS,
        'x86_64-apple-darwin': PLATFORM_MACOS,
        PLATFORM_MACOS_ARM64: PLATFORM_MACOS_ARM64,
        'Darwin-arm64': PLATFORM_MACOS_ARM64,
        'aarch64-apple-darwin': PLATFORM_MACOS_ARM64,
        'arm64-apple-darwin': PLATFORM_MACOS_ARM64,
        # Linux
        PLATFORM_LINUX64: PLATFORM_LINUX64,
        'linux64': PLATFORM_LINUX64,
        'Linux-x86_64': PLATFORM_LINUX64,
        'FreeBSD-amd64': PLATFORM_LINUX64,
        'x86_64-linux-gnu': PLATFORM_LINUX64,
        PLATFORM_LINUX32: PLATFORM_LINUX32,
        'linux32': PLATFORM_LINUX32,
        'Linux-i686': PLATFORM_LINUX32,
        'FreeBSD-i386': PLATFORM_LINUX32,
        'i586-linux-gnu': PLATFORM_LINUX32,
        'i686-linux-gnu': PLATFORM_LINUX32,
        PLATFORM_LINUX_ARM64: PLATFORM_LINUX_ARM64,
        'Linux-arm64': PLATFORM_LINUX_ARM64,
        'Linux-aarch64': PLATFORM_LINUX_ARM64,
        'Linux-armv8l': PLATFORM_LINUX_ARM64,
        'aarch64': PLATFORM_LINUX_ARM64,
        PLATFORM_LINUX_ARMHF: PLATFORM_LINUX_ARMHF,
        'arm-linux-gnueabihf': PLATFORM_LINUX_ARMHF,
        PLATFORM_LINUX_ARM32: PLATFORM_LINUX_ARM32,
        'arm-linux-gnueabi': PLATFORM_LINUX_ARM32,
        'Linux-armv7l': PLATFORM_LINUX_ARM32,
        'Linux-arm': PLATFORM_LINUX_ARM32,
    }

    # List of platforms that are not supported by ESP-IDF
    UNSUPPORTED_PLATFORMS = [
        'Linux-armv6l'
    ]

    @staticmethod
    def detect_linux_arm_platform(supposed_platform: Optional[str]) -> Optional[str]:
        """
        We probe the python binary to check exactly what environment the script is running in.

        ARM platform may run on armhf hardware but having armel installed packages.
        To avoid possible armel/armhf libraries mixing need to define user's
        packages architecture to use the same
        See note section in https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#index-mfloat-abi

        ARM platform may run on aarch64 hardware but having armhf installed packages
        (it happens if a docker container is running on arm64 hardware, but using an armhf image).
        """
        if supposed_platform not in (PLATFORM_LINUX_ARM32, PLATFORM_LINUX_ARMHF, PLATFORM_LINUX_ARM64):
            return supposed_platform

        # suppose that installed python was built with the right ABI
        with open(sys.executable, 'rb') as f:
            # see ELF header description in https://man7.org/linux/man-pages/man5/elf.5.html, offsets depend on ElfN size
            if int.from_bytes(f.read(4), sys.byteorder) != int.from_bytes(b'\x7fELF', sys.byteorder):
                return supposed_platform  # ELF magic not found. Use the default platform name from PLATFORM_FROM_NAME
            f.seek(18)  # seek to e_machine
            e_machine = int.from_bytes(f.read(2), sys.byteorder)
            if e_machine == 183:  # EM_AARCH64, https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst
                supposed_platform = PLATFORM_LINUX_ARM64
            elif e_machine == 40:  # EM_ARM, https://github.com/ARM-software/abi-aa/blob/main/aaelf32/aaelf32.rst
                f.seek(36)  # seek to e_flags
                e_flags = int.from_bytes(f.read(4), sys.byteorder)
                if e_flags & 0x400:
                    supposed_platform = PLATFORM_LINUX_ARMHF
                else:
                    supposed_platform = PLATFORM_LINUX_ARM32

        return supposed_platform

    @staticmethod
    def get(platform_alias: Optional[str]) -> str:
        """
        Get a proper platform name based on PLATFORM_FROM_NAME dict.
        """
        if not platform_alias:
            raise ValueError('System platform could not be identified.')

        if platform_alias in Platforms.UNSUPPORTED_PLATFORMS:
            raise ValueError(f'Platform \'{platform_alias}\' is not supported by ESP-IDF.')

        if platform_alias == 'any' and CURRENT_PLATFORM:
            platform_alias = CURRENT_PLATFORM
        platform_name = Platforms.PLATFORM_FROM_NAME.get(platform_alias, None)
        if sys.platform == 'linux':
            platform_name = Platforms.detect_linux_arm_platform(platform_name)

        if not platform_name:
            raise ValueError(f'Support for platform \'{platform_alias}\' hasn\'t been added yet.')

        return platform_name

    @staticmethod
    def get_by_filename(file_name: str) -> str:
        """
        Guess the right platform based on the file name.
        """
        found_alias = ''
        for platform_alias in Platforms.PLATFORM_FROM_NAME:
            # Find the longest alias which matches with file name to avoid mismatching
            if platform_alias in file_name and len(found_alias) < len(platform_alias):
                found_alias = platform_alias
        return Platforms.get(found_alias)


def parse_platform_arg(platform_str: str) -> str:
    """
    Parses platform from input string and checks whether it is a valid platform.
    If not, raises SystemExit exception with error message.
    """
    try:
        platform = Platforms.get(platform_str)
    except ValueError as e:
        fatal(str(e))
        raise SystemExit(1)

    return platform


CURRENT_PLATFORM = parse_platform_arg(PYTHON_PLATFORM)


EXPORT_SHELL = 'shell'
EXPORT_KEY_VALUE = 'key-value'

# the older "DigiCert Global Root CA" certificate used with github.com
DIGICERT_ROOT_CA_CERT = """
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
"""

# the newer "DigiCert Global Root G2" certificate used with dl.espressif.com
DIGICERT_ROOT_G2_CERT = """
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
"""

DL_CERT_DICT = {'dl.espressif.com': DIGICERT_ROOT_G2_CERT,
                'github.com': DIGICERT_ROOT_CA_CERT}


def run_cmd_check_output(cmd: List[str], input_text: Optional[str]=None, extra_paths: Optional[List[str]]=None) -> bytes:
    """
    Runs command and checks output for exceptions. If AttributeError or TypeError occurs, function re-runs the process.
    If return code was not 0, subprocess.CalledProcessError is raised, otherwise, the original error is masked.
    Returns both stdout and stderr of the run command.
    """
    # If extra_paths is given, locate the executable in one of these directories.
    # Note: it would seem logical to add extra_paths to env[PATH], instead, and let OS do the job of finding the
    # executable for us. However this does not work on Windows: https://bugs.python.org/issue8557.
    if extra_paths:
        found = False
        extensions = ['']
        if sys.platform == 'win32':
            extensions.append('.exe')
        for path in extra_paths:
            for ext in extensions:
                fullpath = os.path.join(path, cmd[0] + ext)
                if os.path.exists(fullpath):
                    cmd[0] = fullpath
                    found = True
                    break
            if found:
                break

    try:
        input_bytes = None
        if input_text:
            input_bytes = input_text.encode()
        result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=True, input=input_bytes)
        return result.stdout + result.stderr
    except (AttributeError, TypeError):
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
        stdout, stderr = p.communicate(input_bytes)
        if p.returncode != 0:
            try:
                raise subprocess.CalledProcessError(p.returncode, cmd, stdout, stderr)
            except TypeError:
                raise subprocess.CalledProcessError(p.returncode, cmd, stdout)
        return stdout + stderr


def to_shell_specific_paths(paths_list: List[str]) -> List[str]:
    """
    Converts / (linux)  to \\ (Windows) if called under win32 platform.
    """
    if sys.platform == 'win32':
        paths_list = [p.replace('/', os.path.sep) if os.path.sep in p else p for p in paths_list]

    return paths_list


def get_env_for_extra_paths(extra_paths: List[str]) -> Dict[str, str]:
    """
    Return a copy of environment variables dict, prepending paths listed in extra_paths
    to the PATH environment variable.
    """
    env_arg = os.environ.copy()
    new_path = os.pathsep.join(extra_paths) + os.pathsep + env_arg['PATH']
    if sys.version_info.major == 2:
        env_arg['PATH'] = new_path.encode('utf8')  # type: ignore
    else:
        env_arg['PATH'] = new_path
    return env_arg


def get_file_size_sha256(filename: str, block_size: int=65536) -> Tuple[int, str]:
    """
    Gets file size and its sha256.
    """
    sha256 = hashlib.sha256()
    size = 0
    with open(filename, 'rb') as f:
        for block in iter(lambda: f.read(block_size), b''):
            sha256.update(block)
            size += len(block)
    return size, sha256.hexdigest()


def report_progress(count: int, block_size: int, total_size: int) -> None:
    """
    Prints progress (count * block_size * 100 / total_size) to stdout.
    """
    percent = int(count * block_size * 100 / total_size)
    percent = min(100, percent)
    sys.stdout.write('\r%d%%' % percent)
    sys.stdout.flush()


def mkdir_p(path: str) -> None:
    """
    Makes directory in given path.
    Suppresses error when directory is already created or path is a path to file.
    """
    try:
        os.makedirs(path)
    except OSError as exc:
        if exc.errno != errno.EEXIST or not os.path.isdir(path):
            raise


def unpack(filename: str, destination: str) -> None:
    """
    Extracts file specified by filename into destination depending on its type.
    """
    info(f'Extracting {filename} to {destination}')
    if filename.endswith(('.tar.gz', '.tgz')):
        archive_obj: Union[TarFile, ZipFile] = tarfile.open(filename, 'r:gz')
    elif filename.endswith(('.tar.xz')):
        archive_obj = tarfile.open(filename, 'r:xz')
    elif filename.endswith(('.tar.bz2')):
        archive_obj = tarfile.open(filename, 'r:bz2')
    elif filename.endswith('zip'):
        archive_obj = ZipFile(filename)
    else:
        raise NotImplementedError('Unsupported archive type')
    if sys.version_info.major == 2:
        # This is a workaround for the issue that unicode destination is not handled:
        # https://bugs.python.org/issue17153
        destination = str(destination)
    archive_obj.extractall(destination)
    # ZipFile on Unix systems does not preserve file permissions while extracting it
    # We need to reset the permissions afterward
    if sys.platform != 'win32' and filename.endswith('zip') and isinstance(archive_obj, ZipFile):
        for file_info in archive_obj.infolist():
            extracted_file = os.path.join(destination, file_info.filename)
            extracted_permissions = file_info.external_attr >> 16 & 0o777  # Extract Unix permissions
            if os.path.exists(extracted_file):
                os.chmod(extracted_file, extracted_permissions)


def splittype(url: str) -> Tuple[Optional[str], str]:
    """
    Splits given url into its type (e.g. https, file) and the rest.
    """
    match = re.match('([^/:]+):(.*)', url, re.DOTALL)
    if match:
        scheme, data = match.groups()
        return scheme.lower(), data
    return None, url


def urlretrieve_ctx(url: str,
                    filename: str,
                    reporthook: Optional[Callable[[int, int, int], None]]=None,
                    data: Optional[bytes]=None,
                    context: Optional[SSLContext]=None) -> Tuple[str, addinfourl]:
    """
    Retrieve data from given URL. An alternative version of urlretrieve which takes SSL context as an argument.
    """
    url_type, path = splittype(url)

    # urlopen doesn't have context argument in Python <=2.7.9
    extra_urlopen_args = {}
    if context:
        extra_urlopen_args['context'] = context
    with contextlib.closing(urlopen(url, data, **extra_urlopen_args)) as fp:  # type: ignore
        headers = fp.info()

        # Just return the local path and the "headers" for file://
        # URLs. No sense in performing a copy unless requested.
        if url_type == 'file' and not filename:
            return os.path.normpath(path), headers

        # Handle temporary file setup.
        tfp = open(filename, 'wb')

        with tfp:
            result = filename, headers
            bs = 1024 * 8
            size = int(headers.get('content-length', -1))
            read = 0
            blocknum = 0

            if reporthook:
                reporthook(blocknum, bs, size)

            while True:
                block = fp.read(bs)
                if not block:
                    break
                read += len(block)
                tfp.write(block)
                blocknum += 1
                if reporthook:
                    reporthook(blocknum, bs, size)

    if size >= 0 and read < size:
        raise ContentTooShortError(
            'retrieval incomplete: got only %i out of %i bytes'
            % (read, size), result)

    return result


def download(url: str, destination: str) -> Union[None, Exception]:
    """
    Download from given url and save into given destination.
    """
    info(f'Downloading {url}')
    info(f'Destination: {destination}')
    try:
        for site, cert in DL_CERT_DICT.items():
            # For dl.espressif.com and github.com, add the DigiCert root certificate.
            # This works around the issue with outdated certificate stores in some installations.
            if site in url:
                ctx = ssl.create_default_context()
                ctx.load_verify_locations(cadata=cert)
                break
        else:
            ctx = None

        urlretrieve_ctx(url, destination, report_progress if not g.non_interactive else None, context=ctx)
        sys.stdout.write('\rDone\n')
        return None
    except Exception as e:
        # urlretrieve could throw different exceptions, e.g. IOError when the server is down
        return e
    finally:
        sys.stdout.flush()


def rename_with_retry(path_from: str, path_to: str) -> None:
    """
    Sometimes renaming a directory on Windows (randomly?) causes a PermissionError.
    This is confirmed to be a workaround:
    https://github.com/espressif/esp-idf/issues/3819#issuecomment-515167118
    https://github.com/espressif/esp-idf/issues/4063#issuecomment-531490140
    https://stackoverflow.com/a/43046729
    """
    retry_count = 20 if sys.platform.startswith('win') else 1
    for retry in range(retry_count):
        try:
            os.rename(path_from, path_to)
            return
        except OSError:
            msg = f'Rename {path_from} to {path_to} failed'
            if retry == retry_count - 1:
                fatal(f'{msg}. Antivirus software might be causing this. Disabling it temporarily could solve the issue.')
                raise
            warn(f'{msg}, retrying...')
            # Sleep before the next try in order to pass the antivirus check on Windows
            time.sleep(0.5)


def do_strip_container_dirs(path: str, levels: int) -> None:
    """
    The number of top directory levels specified by levels argument will be removed when extracting.
    E.g. if levels=2, archive path a/b/c/d.txt will be extracted as c/d.txt.
    """
    assert levels > 0
    # move the original directory out of the way (add a .tmp suffix)
    tmp_path = f'{path}.tmp'
    if os.path.exists(tmp_path):
        shutil.rmtree(tmp_path)
    rename_with_retry(path, tmp_path)
    os.mkdir(path)
    base_path = tmp_path
    # walk given number of levels down
    for level in range(levels):
        contents = os.listdir(base_path)
        if len(contents) > 1:
            raise RuntimeError(f'at level {level}, expected 1 entry, got {contents}')
        base_path = os.path.join(base_path, contents[0])
        if not os.path.isdir(base_path):
            raise RuntimeError(f'at level {level}, {contents[0]} is not a directory')
    # get the list of directories/files to move
    contents = os.listdir(base_path)
    for name in contents:
        move_from = os.path.join(base_path, name)
        move_to = os.path.join(path, name)
        rename_with_retry(move_from, move_to)
    shutil.rmtree(tmp_path)


class ToolNotFoundError(RuntimeError):
    """
    Raise when the tool is not found (not present in the paths etc.).
    """
    pass


class ToolExecError(RuntimeError):
    """
    Raise when  the tool returns with a non-zero exit code.
    """
    pass


class ToolBinaryError(RuntimeError):
    """"
    Raise when an error occurred when running any version of the tool.
    """
    pass


class IDFToolDownload(object):
    """
    Structure to store all the relevant information about particular download.
    """
    def __init__(self, platform_name: str, url: str, size: int, sha256: str, rename_dist: str) -> None:
        self.platform_name = platform_name
        self.url = url
        self.size = size
        self.sha256 = sha256
        self.rename_dist = rename_dist


@functools.total_ordering
class IDFToolVersion(object):
    """
    Used for storing information about version; status (recommended, supported, deprecated)
    and easy way of comparing different versions. Also allows platform compatibility check
    and getting right download for given platform, if available.
    """
    STATUS_RECOMMENDED = 'recommended'
    STATUS_SUPPORTED = 'supported'
    STATUS_DEPRECATED = 'deprecated'

    STATUS_VALUES = [STATUS_RECOMMENDED, STATUS_SUPPORTED, STATUS_DEPRECATED]

    def __init__(self, version: str, status: str) -> None:
        self.version = version
        self.status = status
        self.downloads: OrderedDict[str, IDFToolDownload] = OrderedDict()
        self.latest = False

    def __lt__(self, other: 'IDFToolVersion') -> bool:
        if self.status != other.status:
            return self.status > other.status
        else:
            assert not (self.status == IDFToolVersion.STATUS_RECOMMENDED
                        and other.status == IDFToolVersion.STATUS_RECOMMENDED)
            return self.version < other.version

    def __eq__(self, other: object) -> bool:
        if not isinstance(other, IDFToolVersion):
            return NotImplemented
        return self.status == other.status and self.version == other.version

    def add_download(self, platform_name: str, url: str, size: int, sha256: str, rename_dist: str = '') -> None:
        """
        Add download entry of type IDFToolDownload into self.downloads.
        """
        self.downloads[platform_name] = IDFToolDownload(platform_name, url, size, sha256, rename_dist)

    def get_download_for_platform(self, platform_name: Optional[str]) -> Optional[IDFToolDownload]:
        """
        Get download for given platform if usable download already exists.
        """
        try:
            platform_name = Platforms.get(platform_name)
            if platform_name in self.downloads.keys():
                return self.downloads[platform_name]
        # exception can be omitted, as not detected platform is handled without err message
        except ValueError:
            pass
        if 'any' in self.downloads.keys():
            return self.downloads['any']
        return None

    def compatible_with_platform(self, platform_name: Optional[str] = PYTHON_PLATFORM) -> bool:
        """
        Check whether this version is compatible with given platform name.
        """
        return self.get_download_for_platform(platform_name) is not None

    def get_supported_platforms(self) -> Set[str]:
        """
        Get all platforms for which this version has a valid download record.
        """
        return set(self.downloads.keys())


IDFToolOptions = namedtuple('IDFToolOptions', [
    'version_cmd',
    'version_regex',
    'version_regex_replace',
    'is_executable',
    'export_paths',
    'export_vars',
    'install',
    'info_url',
    'license',
    'strip_container_dirs',
    'supported_targets'])


class IDFTool(object):
    """
    Used to store info about IDF tools from tools.json file in a Python-accesible form.
    The term "IDF tool" is used for e.g. CMake, ninja, QUEMU and toolchains.
    """
    # possible values of 'install' field
    INSTALL_ALWAYS = 'always'
    INSTALL_ON_REQUEST = 'on_request'
    INSTALL_NEVER = 'never'

    def __init__(self, name: str,
                 description: str,
                 install: str,
                 info_url: str,
                 license: str,
                 version_cmd: List[str],
                 version_regex: str,
                 supported_targets: List[str],
                 version_regex_replace: Optional[str] = None,
                 strip_container_dirs: int = 0,
                 is_executable: bool = True) -> None:
        self.name = name
        self.description = description
        self.drop_versions()
        self.version_in_path: Optional[str] = None
        self.versions_installed: List[str] = []
        if version_regex_replace is None:
            version_regex_replace = VERSION_REGEX_REPLACE_DEFAULT
        self.options = IDFToolOptions(version_cmd, version_regex, version_regex_replace, is_executable,
                                      [], OrderedDict(), install, info_url, license, strip_container_dirs, supported_targets)  # type: ignore
        self.platform_overrides: List[Dict[str, str]] = []
        self._platform = CURRENT_PLATFORM
        self._update_current_options()
        self.is_executable = is_executable

    def copy_for_platform(self, platform: str) -> 'IDFTool':
        """
        Copy the IDFTool record in respect to given platform (e.g. apply platform overrides).
        """
        result = copy.deepcopy(self)
        result._platform = platform
        result._update_current_options()
        return result

    def _update_current_options(self) -> None:
        """
        Update current options by platform overrides, if applicable for current platform.
        """
        self._current_options = IDFToolOptions(*self.options)
        for override in self.platform_overrides:
            if self._platform and self._platform not in override['platforms']:
                continue
            override_dict = override.copy()
            del override_dict['platforms']
            self._current_options = self._current_options._replace(**override_dict)  # type: ignore

    def drop_versions(self) -> None:
        """
        Clear self.versions dictionary.
        """
        self.versions: Dict[str, IDFToolVersion] = OrderedDict()

    def add_version(self, version: IDFToolVersion) -> None:
        """
        Add new IDFVersion to self.versions.
        """
        assert type(version) is IDFToolVersion
        self.versions[version.version] = version

    def get_path(self) -> str:
        """
        Returns path where the tool is installed.
        """
        return os.path.join(g.idf_tools_path, 'tools', self.name)

    def get_path_for_version(self, version: str) -> str:
        """
        Returns path for the tool of given version.
        """
        assert version in self.versions
        return os.path.join(self.get_path(), version)

    def get_export_paths(self, version: str) -> List[str]:
        """
        Returns a list of paths that need to be exported.
        """
        tool_path = self.get_path_for_version(version)
        return [os.path.join(tool_path, *p) for p in self._current_options.export_paths]  # type: ignore

    def get_export_vars(self, version: str) -> Dict[str, str]:
        """
        Get the dictionary of environment variables to be exported, for the given version.
        Expands:
        - ${TOOL_PATH} => the actual path where the version is installed.
        """
        result = {}
        for k, v in self._current_options.export_vars.items():  # type: ignore
            replace_path = self.get_path_for_version(version).replace('\\', '\\\\')
            v_repl = re.sub(SUBST_TOOL_PATH_REGEX, replace_path, v)
            if v_repl != v:
                v_repl = to_shell_specific_paths([v_repl])[0]
            old_v = os.environ.get(k)
            if old_v is None or old_v != v_repl:
                result[k] = v_repl
        return result

    def get_version(self, extra_paths: Optional[List[str]] = None, executable_path: Optional[str] = None) -> str:
        """
        Execute the tool, optionally prepending extra_paths to PATH,
        extract the version string and return it as a result.
        Raises ToolNotFoundError if the tool is not found (not present in the paths).
        Raises ToolExecError if the tool returns with a non-zero exit code.
        Returns 'unknown' if tool returns something from which version string
        can not be extracted.
        """
        # this function can not be called for a different platform
        assert self._platform == CURRENT_PLATFORM
        cmd = self._current_options.version_cmd  # type: ignore
        if executable_path:
            cmd[0] = executable_path

        if not cmd[0]:
            # There is no command available, so return early. It seems that
            # within some very strange context empty [''] may actually execute
            # something https://github.com/espressif/esp-idf/issues/11880
            raise ToolNotFoundError(f'Tool {self.name} not found')

        try:
            version_cmd_result = run_cmd_check_output(cmd, None, extra_paths)
        except OSError as e:
            # tool is not on the path
            raise ToolNotFoundError(f'Tool {self.name} not found with error: {e}')
        except subprocess.CalledProcessError as e:
            raise ToolExecError(f'non-zero exit code ({e.returncode}) with message: {e.stderr.decode("utf-8",errors="ignore")}')  # type: ignore

        in_str = version_cmd_result.decode('utf-8')
        match = re.search(self._current_options.version_regex, in_str)  # type: ignore
        if not match:
            return UNKNOWN_VERSION
        return re.sub(self._current_options.version_regex, self._current_options.version_regex_replace, match.group(0))  # type: ignore

    def check_binary_valid(self, version: str) -> bool:
        if not self.is_executable:
            return True
        try:
            ver_str = self.get_version(self.get_export_paths(version))
        except (ToolNotFoundError, ToolExecError) as e:
            fatal(f'tool {self.name} version {version} is installed, but getting error: {e}')
            return False
        if ver_str != version:
            # just print, state is still valid
            warn(f'tool {self.name} version {version} is installed, but reporting version {ver_str}')
        return True

    def check_version(self, executable_path: Optional[str]) -> bool:
        """
        Check if tool's version from executable path is in self.version dictionary.
        """
        version = self.get_version(executable_path=executable_path)
        return version in self.versions

    def get_install_type(self) -> Callable[[str], None]:
        """
        Returns whether the tools are installed always, on request or never.
        """
        return self._current_options.install  # type: ignore

    def get_supported_targets(self) -> List[str]:
        """
        Returns list of supported targets with current options.
        """
        return self._current_options.supported_targets  # type: ignore

    def is_supported_for_any_of_targets(self, targets: List[str]) -> bool:
        """
        Checks whether the tool is suitable for at least one of the specified targets.
        """
        supported_targets = self.get_supported_targets()
        return (any(item in targets for item in supported_targets) or supported_targets == ['all'])

    def compatible_with_platform(self) -> bool:
        """
        Checks whether this tool (any version) is compatible  with the platform.
        """
        return any([v.compatible_with_platform() for v in self.versions.values()])

    def get_supported_platforms(self) -> Set[str]:
        """
        Return set of platforms that are supported by at least one version of the tool.
        """
        result = set()
        for v in self.versions.values():
            result.update(v.get_supported_platforms())
        return result

    def get_recommended_version(self) -> Optional[str]:
        """
        Get all recommended versions of the tool. If more versions are recommended, highest version is returned.
        """
        recommended_versions = [k for k, v in self.versions.items()
                                if v.status == IDFToolVersion.STATUS_RECOMMENDED
                                and v.compatible_with_platform(self._platform)]
        assert len(recommended_versions) <= 1
        if recommended_versions:
            return recommended_versions[0]
        return None

    def get_preferred_installed_version(self) -> Optional[str]:
        """
        Get the preferred installed version of the tool. If more versions installed, return the highest.
        """
        recommended_versions = [k for k in self.versions_installed
                                if self.versions[k].status == IDFToolVersion.STATUS_RECOMMENDED
                                and self.versions[k].compatible_with_platform(self._platform)]
        assert len(recommended_versions) <= 1
        if recommended_versions:
            return recommended_versions[0]
        return None

    def find_installed_versions(self) -> None:
        """
        Checks whether the tool can be found in PATH and in GlobalVarsStore.idf_tools_path.
        Writes results to self.version_in_path and self.versions_installed.

        Raises ToolBinaryError if an error occurred when running any version of the tool.
        """
        # this function can not be called for a different platform
        assert self._platform == CURRENT_PLATFORM
        tool_error = False
        # First check if the tool is in system PATH
        try:
            ver_str = self.get_version()
        except ToolNotFoundError:
            # not in PATH
            pass
        except ToolExecError as e:
            fatal(f'tool {self.name} is found in PATH, but has failed: {e}')
            tool_error = True
        else:
            self.version_in_path = ver_str

        # Now check all the versions installed in GlobalVarsStore.idf_tools_path
        self.versions_installed = []
        for version, version_obj in self.versions.items():
            if not version_obj.compatible_with_platform():
                continue
            tool_path = self.get_path_for_version(version)
            if not os.path.exists(tool_path):
                # version not installed
                continue
            if not self.is_executable:
                self.versions_installed.append(version)
                continue
            try:
                ver_str = self.get_version(self.get_export_paths(version))
            except ToolNotFoundError as e:
                warn(f'directory for tool {self.name} version {version} is present, but the tool has not been found: {e}')
            except ToolExecError as e:
                fatal(f'tool {self.name} version {version} is installed, but cannot be run: {e}')
                tool_error = True
            else:
                if ver_str != version:
                    warn(f'tool {self.name} version {version} is installed, but has reported version {ver_str}')
                else:
                    self.versions_installed.append(version)
        if tool_error:
            raise ToolBinaryError

    def latest_installed_version(self) -> Optional[str]:
        """
        Get the latest installed tool version by directly checking the
        tool's version directories.
        """
        tool_path = self.get_path()
        if not os.path.exists(tool_path):
            return None
        dentries = os.listdir(tool_path)
        dirs = [d for d in dentries if os.path.isdir(os.path.join(tool_path, d))]
        for version in sorted(dirs, reverse=True):
            # get_path_for_version() has assert to check if version is in versions
            # dict, so get_export_paths() cannot be used. Let's just create the
            # export paths list directly here.
            paths = [os.path.join(tool_path, version, *p) for p in self._current_options.export_paths]
            try:
                ver_str = self.get_version(paths)
            except (ToolNotFoundError, ToolExecError):
                continue
            if ver_str != version:
                continue
            return version

        return None

    def download(self, version: str) -> None:
        """
        Download archive of the tool for platform given by self._platform.
        """
        assert version in self.versions
        download_obj = self.versions[version].get_download_for_platform(self._platform)
        if not download_obj:
            fatal(f'No packages for tool {self.name} platform {self._platform}!')
            raise SystemExit(1)

        url = download_obj.url
        archive_name = download_obj.rename_dist if download_obj.rename_dist else os.path.basename(url)
        local_path = os.path.join(g.idf_tools_path, 'dist', archive_name)
        mkdir_p(os.path.dirname(local_path))

        if os.path.isfile(local_path):
            if not self.check_download_file(download_obj, local_path):
                warn(f'removing downloaded file {archive_name} and downloading again')
                os.unlink(local_path)
            else:
                info(f'file {archive_name} is already downloaded')
                return

        downloaded = False
        local_temp_path = f'{local_path}.tmp'
        for retry in range(DOWNLOAD_RETRY_COUNT):
            err = download(url, local_temp_path)
            if not os.path.isfile(local_temp_path) or not self.check_download_file(download_obj, local_temp_path):
                warn(f'Download failure: {err}')
                warn(f'Failed to download {url} to {local_temp_path}')
                continue
            rename_with_retry(local_temp_path, local_path)
            downloaded = True
            break
        if not downloaded:
            fatal('Failed to download, and retry count has expired')
            print_hints_on_download_error(str(err))
            raise SystemExit(1)

    def install(self, version: str) -> None:
        """
        Unpack archive to destination directory and remove given number of top-level folder if specified.
        Should always be called after IDFTool.download().
        """
        # Currently this is called after calling 'download' method, so here are a few asserts
        # for the conditions which should be true once that method is done.
        assert version in self.versions
        download_obj = self.versions[version].get_download_for_platform(self._platform)
        assert download_obj is not None
        archive_name = download_obj.rename_dist if download_obj.rename_dist else os.path.basename(download_obj.url)
        archive_path = os.path.join(g.idf_tools_path, 'dist', archive_name)
        assert os.path.isfile(archive_path)
        dest_dir = self.get_path_for_version(version)
        if os.path.exists(dest_dir):
            warn('destination path already exists, removing')
            shutil.rmtree(dest_dir)
        mkdir_p(dest_dir)
        unpack(archive_path, dest_dir)
        if self._current_options.strip_container_dirs:  # type: ignore
            do_strip_container_dirs(dest_dir, self._current_options.strip_container_dirs)  # type: ignore
        if not self.check_binary_valid(version):
            fatal(f'Failed to check the tool while installed. Removing directory {dest_dir}')
            shutil.rmtree(dest_dir)
            raise SystemExit(1)

    @staticmethod
    def check_download_file(download_obj: IDFToolDownload, local_path: str) -> bool:
        """
        Compare the computed sha256 to sha256 specified by downloaded archive.
        """
        expected_sha256 = download_obj.sha256
        expected_size = download_obj.size
        file_size, file_sha256 = get_file_size_sha256(local_path)
        if file_size != expected_size:
            warn(f'file size mismatch for {local_path}, expected {expected_size}, got {file_size}')
            return False
        if file_sha256 != expected_sha256:
            warn(f'hash mismatch for {local_path}, expected {expected_sha256}, got {file_sha256}')
            return False
        return True

    @classmethod
    def from_json(cls, tool_dict: Dict[str, Union[str, List[str], Dict[str, str]]]) -> 'IDFTool':
        """
        Create IDFTool class instance form its JSON dump.
        """
        # Validate json fields
        tool_name = tool_dict.get('name')  # type: ignore
        if not isinstance(tool_name, str):
            raise RuntimeError('tool_name is not a string')

        description = tool_dict.get('description')  # type: ignore
        if not isinstance(description, str):
            raise RuntimeError('description is not a string')

        is_executable = tool_dict.get('is_executable', True)  # type: ignore
        if not isinstance(is_executable, bool):
            raise RuntimeError(f'is_executable for tool {tool_name} is not a bool')

        version_cmd = tool_dict.get('version_cmd')
        if type(version_cmd) is not list:
            raise RuntimeError(f'version_cmd for tool {tool_name} is not a list of strings')

        version_regex = tool_dict.get('version_regex')
        if not isinstance(version_regex, str) or (not version_regex and is_executable):
            raise RuntimeError(f'version_regex for tool {tool_name} is not a non-empty string')

        version_regex_replace = tool_dict.get('version_regex_replace')
        if version_regex_replace and not isinstance(version_regex_replace, str):
            raise RuntimeError(f'version_regex_replace for tool {tool_name} is not a string')

        export_paths = tool_dict.get('export_paths')
        if type(export_paths) is not list:
            raise RuntimeError(f'export_paths for tool {tool_name} is not a list')

        export_vars = tool_dict.get('export_vars', {})  # type: ignore
        if type(export_vars) is not dict:
            raise RuntimeError(f'export_vars for tool {tool_name} is not a mapping')

        versions = tool_dict.get('versions')
        if type(versions) is not list:
            raise RuntimeError(f'versions for tool {tool_name} is not an array')

        install = tool_dict.get('install', False)  # type: ignore
        if not isinstance(install, str):
            raise RuntimeError(f'install for tool {tool_name} is not a string')

        info_url = tool_dict.get('info_url', False)  # type: ignore
        if not isinstance(info_url, str):
            raise RuntimeError(f'info_url for tool {tool_name} is not a string')

        license = tool_dict.get('license', False)  # type: ignore
        if not isinstance(license, str):
            raise RuntimeError(f'license for tool {tool_name} is not a string')

        strip_container_dirs = tool_dict.get('strip_container_dirs', 0)
        if strip_container_dirs and type(strip_container_dirs) is not int:
            raise RuntimeError(f'strip_container_dirs for tool {tool_name} is not an int')

        overrides_list = tool_dict.get('platform_overrides', [])  # type: ignore
        if type(overrides_list) is not list:
            raise RuntimeError(f'platform_overrides for tool {tool_name} is not a list')

        supported_targets = tool_dict.get('supported_targets')
        if not isinstance(supported_targets, list):
            raise RuntimeError(f'supported_targets for tool {tool_name} is not a list of strings')

        # Create the object
        tool_obj: 'IDFTool' = cls(tool_name, description, install, info_url, license,  # type: ignore
                                  version_cmd, version_regex, supported_targets, version_regex_replace,  # type: ignore
                                  strip_container_dirs, is_executable)  # type: ignore

        for path in export_paths:  # type: ignore
            tool_obj.options.export_paths.append(path)  # type: ignore

        for name, value in export_vars.items():  # type: ignore
            tool_obj.options.export_vars[name] = value  # type: ignore

        for index, override in enumerate(overrides_list):
            platforms_list = override.get('platforms')  # type: ignore
            if type(platforms_list) is not list:
                raise RuntimeError('platforms for override %d of tool %s is not a list' % (index, tool_name))

            install = override.get('install')  # type: ignore
            if install is not None and not isinstance(install, str):
                raise RuntimeError('install for override %d of tool %s is not a string' % (index, tool_name))

            version_cmd = override.get('version_cmd')  # type: ignore
            if version_cmd is not None and type(version_cmd) is not list:
                raise RuntimeError('version_cmd for override %d of tool %s is not a list of strings' %
                                   (index, tool_name))

            version_regex = override.get('version_regex')  # type: ignore
            if version_regex is not None and (not isinstance(version_regex, str) or not version_regex):
                raise RuntimeError('version_regex for override %d of tool %s is not a non-empty string' %
                                   (index, tool_name))

            version_regex_replace = override.get('version_regex_replace')  # type: ignore
            if version_regex_replace is not None and not isinstance(version_regex_replace, str):
                raise RuntimeError('version_regex_replace for override %d of tool %s is not a string' %
                                   (index, tool_name))

            export_paths = override.get('export_paths')  # type: ignore
            if export_paths is not None and type(export_paths) is not list:
                raise RuntimeError('export_paths for override %d of tool %s is not a list' % (index, tool_name))

            export_vars = override.get('export_vars')  # type: ignore
            if export_vars is not None and type(export_vars) is not dict:
                raise RuntimeError('export_vars for override %d of tool %s is not a mapping' % (index, tool_name))
            tool_obj.platform_overrides.append(override)  # type: ignore

        recommended_versions:Dict[str, List[str]] = {}
        for version_dict in versions:  # type: ignore
            version = version_dict.get('name')  # type: ignore
            if not isinstance(version, str):
                raise RuntimeError(f'version name for tool {tool_name} is not a string')

            version_status = version_dict.get('status')  # type: ignore
            if not isinstance(version_status, str) and version_status not in IDFToolVersion.STATUS_VALUES:
                raise RuntimeError('tool {} version {} status is not one of {}', tool_name, version,
                                   IDFToolVersion.STATUS_VALUES)

            version_obj = IDFToolVersion(version, version_status)
            for platform_id, platform_dict in version_dict.items():  # type: ignore
                if platform_id in ['name', 'status']:
                    continue
                try:
                    Platforms.get(platform_id)
                except ValueError:
                    raise RuntimeError('invalid platform %s for tool %s version %s' %
                                       (platform_id, tool_name, version))

                version_obj.add_download(platform_id,
                                         platform_dict['url'], platform_dict['size'],
                                         platform_dict['sha256'], platform_dict.get('rename_dist', ''))

                if version_status == IDFToolVersion.STATUS_RECOMMENDED:
                    if platform_id not in recommended_versions:
                        recommended_versions[platform_id] = []
                    recommended_versions[platform_id].append(version)

            tool_obj.add_version(version_obj)
        for platform_id, version_list in recommended_versions.items():
            if len(version_list) > 1:
                raise RuntimeError(f'tool {tool_name} for platform {platform_id} has {len(recommended_versions)} recommended versions')
            if install != IDFTool.INSTALL_NEVER and len(recommended_versions) == 0:
                raise RuntimeError(f'required/optional tool {tool_name} for platform {platform_id} has no recommended versions')

        tool_obj._update_current_options()
        return tool_obj

    def to_json(self):  # type: ignore
        """
        Make a JSON dump of self.
        """
        versions_array = []
        for version, version_obj in self.versions.items():
            version_json = {
                'name': version,
                'status': version_obj.status
            }
            for platform_id, download in version_obj.downloads.items():
                if download.rename_dist:
                    version_json[platform_id] = {
                        'url': download.url,
                        'size': download.size,
                        'sha256': download.sha256,
                        'rename_dist': download.rename_dist
                    }
                else:
                    version_json[platform_id] = {
                        'url': download.url,
                        'size': download.size,
                        'sha256': download.sha256
                    }
            versions_array.append(version_json)
        overrides_array = self.platform_overrides

        tool_json = {
            'name': self.name,
            'description': self.description,
            'export_paths': self.options.export_paths,
            'export_vars': self.options.export_vars,
            'install': self.options.install,
            'info_url': self.options.info_url,
            'license': self.options.license,
            'version_cmd': self.options.version_cmd,
            'version_regex': self.options.version_regex,
            'supported_targets': self.options.supported_targets,
            'versions': versions_array,
        }
        if self.options.version_regex_replace != VERSION_REGEX_REPLACE_DEFAULT:
            tool_json['version_regex_replace'] = self.options.version_regex_replace
        if overrides_array:
            tool_json['platform_overrides'] = overrides_array
        if self.options.strip_container_dirs:
            tool_json['strip_container_dirs'] = self.options.strip_container_dirs
        if self.options.is_executable is False:
            tool_json['is_executable'] = self.options.is_executable
        return tool_json


class IDFEnvEncoder(JSONEncoder):
    """
    IDFEnvEncoder is used for encoding IDFEnv, IDFRecord, SelectedIDFRecord classes to JSON in readable format. Not as (__main__.IDFRecord object at '0x7fcxx').
    Additionally remove first underscore with private properties when processing.
    """
    def default(self, obj):  # type: ignore
        return {k.lstrip('_'): v for k, v in vars(obj).items()}


class IDFRecord:
    """
    IDFRecord represents one record of installed ESP-IDF on system.
    Contains:
        * version - actual version of ESP-IDF (example '5.0')
        * path - absolute path to the ESP-IDF
        * features - features using ESP-IDF
        * targets - ESP chips for which are installed needed toolchains (example ['esp32' , 'esp32s2'])
                  - Default value is [], since user didn't define any targets yet
    """
    def __init__(self) -> None:
        self.version: str = ''
        self.path: str = ''
        self._features: List[str] = ['core']
        self._targets: List[str] = []

    def __iter__(self):  # type: ignore
        yield from {
            'version': self.version,
            'path': self.path,
            'features': self._features,
            'targets': self._targets
        }.items()

    def __str__(self) -> str:
        return json.dumps(dict(self), ensure_ascii=False, indent=4)  # type: ignore

    def __repr__(self) -> str:
        return self.__str__()

    def __eq__(self, other: object) -> bool:
        if not isinstance(other, IDFRecord):
            return False
        return all(getattr(self, x) == getattr(other, x) for x in ('version', 'path', 'features', 'targets'))

    def __ne__(self, other: object) -> bool:
        if not isinstance(other, IDFRecord):
            return False
        return not self.__eq__(other)

    @property
    def features(self) -> List[str]:
        return self._features

    def update_features(self, add: Tuple[str, ...] = (), remove: Tuple[str, ...] = ()) -> None:
        # Update features, but maintain required feature 'core'
        # If the same feature is present in both argument's tuples, do not update this feature
        add_set = set(add)
        remove_set = set(remove)
        # Remove duplicates
        features_to_add = add_set.difference(remove_set)
        features_to_remove = remove_set.difference(add_set)

        features = set(self._features)
        features.update(features_to_add)
        features.difference_update(features_to_remove)
        features.add('core')
        self._features = list(features)

    @property
    def targets(self) -> List[str]:
        return self._targets

    def extend_targets(self, targets: List[str]) -> None:
        # Targets can be only updated, but always maintain existing targets.
        self._targets = list(set(targets + self._targets))

    @classmethod
    def get_active_idf_record(cls) -> 'IDFRecord':
        idf_record_obj = cls()
        idf_record_obj.version = get_idf_version()
        idf_record_obj.path = g.idf_path
        return idf_record_obj

    @classmethod
    def get_idf_record_from_dict(cls, record_dict: Dict[str, Any]) -> 'IDFRecord':
        idf_record_obj = cls()
        try:
            idf_record_obj.version = record_dict['version']
            idf_record_obj.path = record_dict['path']
        except KeyError:
            # When some of these key attributes, which are irreplaceable with default values, are not found, raise VallueError
            raise ValueError('Inconsistent record')

        idf_record_obj.update_features(record_dict.get('features', []))
        idf_record_obj.extend_targets(record_dict.get('targets', []))

        return idf_record_obj


class IDFEnv:
    """
    IDFEnv represents ESP-IDF Environments installed on system and is responsible for loading and saving structured data.
    All information is saved and loaded from IDF_ENV_FILE.
    Contains:
        * idf_installed - all installed environments of ESP-IDF on system.
    """
    def __init__(self) -> None:
        active_idf_id = active_repo_id()
        self.idf_installed: Dict[str, IDFRecord] = {active_idf_id: IDFRecord.get_active_idf_record()}

    def __iter__(self):  # type: ignore
        yield from {
            'idfInstalled': self.idf_installed,
        }.items()

    def __str__(self) -> str:
        return json.dumps(dict(self), cls=IDFEnvEncoder, ensure_ascii=False, indent=4)  # type: ignore

    def __repr__(self) -> str:
        return self.__str__()

    def save(self) -> None:
        """
        Diff current class instance with instance loaded from IDF_ENV_FILE and save only if are different.
        """
        # It is enough to compare just active records because others can't be touched by the running script
        if self.get_active_idf_record() != self.get_idf_env().get_active_idf_record():
            idf_env_file_path = os.path.join(g.idf_tools_path, IDF_ENV_FILE)
            try:
                if g.idf_tools_path:  # mypy fix for Optional[str] in the next call
                    # the directory doesn't exist if this is run on a clean system the first time
                    mkdir_p(g.idf_tools_path)
                with open(idf_env_file_path, 'w', encoding='utf-8') as w:
                    info(f'Updating {idf_env_file_path}')
                    json.dump(dict(self), w, cls=IDFEnvEncoder, ensure_ascii=False, indent=4)  # type: ignore
            except (IOError, OSError):
                if not os.access(g.idf_tools_path, os.W_OK):
                    raise OSError(f'IDF_TOOLS_PATH {g.idf_tools_path} is not accessible to write. '
                                  'Required changes have not been saved')
                raise OSError(f'File {idf_env_file_path} is not accessible to write or corrupted. Required changes have not been saved')

    def get_active_idf_record(self) -> IDFRecord:
        return self.idf_installed[active_repo_id()]

    @classmethod
    def get_idf_env(cls) -> 'IDFEnv':
        """
        IDFEnv class is used to process IDF_ENV_FILE file. The constructor is therefore called only in this method that loads the file and checks its contents.
        """
        idf_env_obj = cls()
        try:
            idf_env_file_path = os.path.join(g.idf_tools_path, IDF_ENV_FILE)
            with open(idf_env_file_path, 'r', encoding='utf-8') as idf_env_file:
                idf_env_json = json.load(idf_env_file)

                try:
                    idf_installed = idf_env_json['idfInstalled']
                except KeyError:
                    # If no ESP-IDF record is found in loaded file, do not update and keep default value from constructor
                    pass
                else:
                    # Load and verify ESP-IDF records found in IDF_ENV_FILE
                    idf_installed.pop('sha', None)
                    idf_installed_verified:Dict[str, IDFRecord] = {}
                    for idf in idf_installed:
                        try:
                            idf_installed_verified[idf] = IDFRecord.get_idf_record_from_dict(idf_installed[idf])
                        except ValueError as err:
                            warn(f'{err} "{idf}" found in {idf_env_file_path}, removing this record.')
                    # Combine ESP-IDF loaded records with the one in constructor, to be sure that there is an active ESP-IDF record in the idf_installed
                    # If the active record is already in idf_installed, it is not overwritten
                    idf_env_obj.idf_installed = dict(idf_env_obj.idf_installed, **idf_installed_verified)

        except (IOError, OSError, ValueError):
            # If no, empty or not-accessible to read IDF_ENV_FILE found, use default values from constructor
            pass

        return idf_env_obj


class ENVState:
    """
    ENVState is used to handle IDF global variables that are set in environment and need to be removed when switching between ESP-IDF versions in opened shell.
    Every opened shell/terminal has it's own temporary file to store these variables.
    The temporary file's name is generated automatically with suffix 'idf_ + opened shell ID'. Path to this tmp file is stored as env global variable (env_key).
    The shell ID is crucial, since in one terminal can be opened more shells.
    * env_key - global variable name/key
    * deactivate_file_path - global variable value (generated tmp file name)
    * idf_variables - loaded IDF variables from file
    """
    env_key = 'IDF_DEACTIVATE_FILE_PATH'
    deactivate_file_path = os.environ.get(env_key, '')

    def __init__(self) -> None:
        self.idf_variables: Dict[str, Any] = {}

    @classmethod
    def get_env_state(cls) -> 'ENVState':
        env_state_obj = cls()

        if cls.deactivate_file_path:
            try:
                with open(cls.deactivate_file_path, 'r') as fp:
                    env_state_obj.idf_variables = json.load(fp)
            except (IOError, OSError, ValueError):
                pass
        return env_state_obj

    def save(self) -> str:
        try:
            if self.deactivate_file_path and os.path.basename(self.deactivate_file_path).endswith(f'idf_{str(os.getppid())}'):
                # If exported file path/name exists and belongs to actual opened shell
                with open(self.deactivate_file_path, 'w') as w:
                    json.dump(self.idf_variables, w, ensure_ascii=False, indent=4)  # type: ignore
            else:
                with tempfile.NamedTemporaryFile(delete=False, suffix=f'idf_{str(os.getppid())}') as fp:
                    self.deactivate_file_path = fp.name
                    fp.write(json.dumps(self.idf_variables, ensure_ascii=False, indent=4).encode('utf-8'))
        except (IOError, OSError):
            warn(f'File storing IDF env variables {self.deactivate_file_path} is not accessible to write. '
                 'Potentional switching ESP-IDF versions may cause problems')
        return self.deactivate_file_path


def load_tools_info() -> Dict[str, IDFTool]:
    """
    Load tools metadata from tools.json, return a dictionary: tool name - tool info.
    """

    tool_versions_file_name = g.tools_json

    with open(tool_versions_file_name, 'r') as f:  # type: ignore
        tools_info = json.load(f)

    return parse_tools_info_json(tools_info)  # type: ignore


def parse_tools_info_json(tools_info):  # type: ignore
    """
    Parse and validate the dictionary obtained by loading the tools.json file.
    Returns a dictionary of tools (key: tool name, value: IDFTool object).
    """
    tools_dict = OrderedDict()

    tools_array = tools_info.get('tools')
    if type(tools_array) is not list:
        raise RuntimeError('tools property is missing or not an array')

    for tool_dict in tools_array:
        tool = IDFTool.from_json(tool_dict)
        tools_dict[tool.name] = tool

    return tools_dict


def dump_tools_json(tools_info: Optional[Dict[str, IDFTool]]):  # type: ignore
    """
    Dump all the tools into JSON.
    """
    tools_array = []
    if tools_info:
        for _, tool_obj in tools_info.items():
            tool_json = tool_obj.to_json()
            tools_array.append(tool_json)
        file_json = {'version': TOOLS_FILE_VERSION, 'tools': tools_array}
        return json.dumps(file_json, indent=2, separators=(',', ': '), sort_keys=True)
    else:
        return json.dumps({}, indent=2, separators=(',', ': '), sort_keys=True)


def get_python_exe_and_subdir() -> Tuple[str, str]:
    """
    Returns:
    * python executable name (python on Unix, python.exe on Win)
    * subdir in which the executable is (bin for Unix, Scripts for Win)
    """
    if sys.platform == 'win32':
        subdir = 'Scripts'
        python_exe = 'python.exe'
    else:
        subdir = 'bin'
        python_exe = 'python'
    return python_exe, subdir


def get_idf_version() -> str:
    """
    Return ESP-IDF version.
    """
    idf_version: Optional[str] = None

    version_file_path = os.path.join(g.idf_path, 'version.txt')
    if os.path.exists(version_file_path):
        with open(version_file_path, 'r') as version_file:
            idf_version_str = version_file.read()

        match = re.match(r'^v([0-9]+\.[0-9]+).*', idf_version_str)
        if match:
            idf_version = match.group(1)

    if idf_version is None:
        try:
            with open(os.path.join(g.idf_path, 'components', 'esp_common', 'include', 'esp_idf_version.h')) as f:
                m = re.search(r'^#define\s+ESP_IDF_VERSION_MAJOR\s+(\d+).+?^#define\s+ESP_IDF_VERSION_MINOR\s+(\d+)',
                              f.read(), re.DOTALL | re.MULTILINE)
                if m:
                    idf_version = '.'.join((m.group(1), m.group(2)))
                else:
                    fatal('Reading IDF version from C header file failed!')
                    raise SystemExit(1)
        except Exception as e:
            fatal(f'It is not possible to determine the IDF version: {e}')
            raise SystemExit(1)
    return idf_version


def get_python_env_path() -> Tuple[str, str, str, str]:
    """
    Returns tuple of Python environment path, Python env. path with subdir and full path from Python (i.e. with executable).
    """
    idf_version = get_idf_version()
    idf_python_env_path = os.getenv('IDF_PYTHON_ENV_PATH') or os.path.join(g.idf_tools_path,
                                                                           'python_env',
                                                                           PYTHON_VENV_DIR_TEMPLATE.format(idf_version,
                                                                                                           PYTHON_VER_MAJOR_MINOR))

    python_exe, subdir = get_python_exe_and_subdir()
    idf_python_export_path = os.path.join(idf_python_env_path, subdir)
    virtualenv_python = os.path.join(idf_python_export_path, python_exe)

    return idf_python_env_path, idf_python_export_path, virtualenv_python, idf_version


def parse_tools_arg(tools_str: List[str]) -> List[str]:
    """
    Base parsing "tools" arguments: all, required, etc.
    """
    if not tools_str:
        return ['required']
    else:
        return tools_str


def expand_tools_arg(tools_spec: List[str], overall_tools: OrderedDict, targets: List[str]) -> List[str]:
    """
    Expand list of tools 'tools_spec' in according:
        - a tool is in the 'overall_tools' list
        - consider metapackages like "required" and "all"
        - process wildcards in tool names
        - a tool supports chips from 'targets'
    """
    tools = []
    # Filtering tools if they are in overall_tools
    # Processing wildcards if possible
    for tool_pattern in tools_spec:
        tools.extend([k for k, _ in overall_tools.items() if fnmatch.fnmatch(k,tool_pattern) and k not in tools])

    # Processing "metapackage"
    if 'required' in tools_spec:
        tools.extend([k for k, v in overall_tools.items() if v.get_install_type() == IDFTool.INSTALL_ALWAYS and k not in tools])

    elif 'all' in tools_spec:
        tools.extend([k for k, v in overall_tools.items() if v.get_install_type() != IDFTool.INSTALL_NEVER and k not in tools])

    # Filtering by ESP_targets
    tools = [k for k in tools if overall_tools[k].is_supported_for_any_of_targets(targets)]
    return tools


def parse_targets_arg(targets_str: str) -> List[str]:
    """
    Parse and check if targets_str is a valid list of targets and return a target list.
    """
    targets_from_tools_json = get_all_targets_from_tools_json()
    invalid_targets = []

    targets_str = targets_str.lower()
    targets = targets_str.replace('-', '').split(',')
    if targets == ['all']:
        return targets_from_tools_json
    else:
        invalid_targets = [t for t in targets if t not in targets_from_tools_json]
        if invalid_targets:
            warn(f'Targets: \"{", ".join(invalid_targets)}\" are not supported. Only allowed options are: {", ".join(targets_from_tools_json)}.')
            raise SystemExit(1)
        return targets


def add_and_check_targets(idf_env_obj: IDFEnv, targets_str: str) -> List[str]:
    """
    Define targets from targets_str, check that the target names are valid and add them to idf_env_obj.
    """
    targets = parse_targets_arg(targets_str)
    idf_env_obj.get_active_idf_record().extend_targets(targets)
    return idf_env_obj.get_active_idf_record().targets


def feature_to_requirements_path(feature: str) -> str:
    """
    Convert feature (ci, core, docs, gdbgui, pytest, ...) to the path to its requirements.txt.
    """
    return os.path.join(g.idf_path, 'tools', 'requirements', f'requirements.{feature}.txt')


def process_and_check_features(idf_env_obj: IDFEnv, features_str: str) -> List[str]:
    """
    Check whether new feature is valid. If yes, update features in active IDF record.
    """
    new_features = []
    remove_features = []
    for new_feature_candidate in features_str.split(','):
        if new_feature_candidate.startswith('-'):
            remove_features += [new_feature_candidate.lstrip('-')]
        else:
            new_feature_candidate = new_feature_candidate.lstrip('+')
            # Feature to be added needs to be checked if is valid
            if os.path.isfile(feature_to_requirements_path(new_feature_candidate)):
                new_features += [new_feature_candidate]
    idf_env_obj.get_active_idf_record().update_features(tuple(new_features), tuple(remove_features))
    return idf_env_obj.get_active_idf_record().features


def get_all_targets_from_tools_json() -> List[str]:
    """
    Returns list of all targets from tools.json file.
    """
    tools_info = load_tools_info()
    targets_from_tools_json: List[str] = []

    for _, v in tools_info.items():
        targets_from_tools_json.extend(v.get_supported_targets())
    # remove duplicates
    targets_from_tools_json = list(set(targets_from_tools_json))
    if 'all' in targets_from_tools_json:
        targets_from_tools_json.remove('all')
    return sorted(targets_from_tools_json)


def filter_tools_info(idf_env_obj: IDFEnv, tools_info: Dict[str, IDFTool]) -> Dict[str,IDFTool]:
    """
    Filter tools info; return only those targets which:
        * are installable (install type is INSTALL_ALWAYS or INSTALL_ON_REQUEST)
        * support at least one target from active IDF record
    """
    targets = idf_env_obj.get_active_idf_record().targets
    if not targets:
        return tools_info
    else:
        filtered_tools_spec = {k:v for k, v in tools_info.items() if
                               (v.get_install_type() == IDFTool.INSTALL_ALWAYS or v.get_install_type() == IDFTool.INSTALL_ON_REQUEST) and
                               (any(item in targets for item in v.get_supported_targets()) or v.get_supported_targets() == ['all'])}
        return OrderedDict(filtered_tools_spec)


def add_variables_to_deactivate_file(args: List[str], new_idf_vars:Dict[str, Any]) -> str:
    """
    Add IDF global variables that need to be removed when the active esp-idf environment is deactivated.
    """
    if 'PATH' in new_idf_vars:
        new_idf_vars['PATH'] = new_idf_vars['PATH'].split(':')[:-1]  # PATH is stored as list of sub-paths without '$PATH'

    new_idf_vars['PATH'] = new_idf_vars.get('PATH', [])
    args_add_paths_extras = vars(args).get('add_paths_extras')  # remove mypy error with args
    new_idf_vars['PATH'] = new_idf_vars['PATH'] + args_add_paths_extras.split(':') if args_add_paths_extras else new_idf_vars['PATH']

    env_state_obj = ENVState.get_env_state()

    if env_state_obj.idf_variables:
        exported_idf_vars = env_state_obj.idf_variables
        new_idf_vars['PATH'] = list(set(new_idf_vars['PATH'] + exported_idf_vars.get('PATH', [])))  # remove duplicates
        env_state_obj.idf_variables = dict(exported_idf_vars, **new_idf_vars)  # merge two dicts
    else:
        env_state_obj.idf_variables = new_idf_vars
    deactivate_file_path = env_state_obj.save()

    return deactivate_file_path


def print_deactivate_statement(args: List[str]) -> None:
    """
    Deactivate statement is sequence of commands, that remove IDF global variables from environment,
    so the environment gets to the state it was before calling export.{sh/fish} script.
    """
    env_state_obj = ENVState.get_env_state()
    if not env_state_obj.idf_variables:
        warn('No IDF variables to remove from environment found. Deactivation of previous esp-idf version was not successful.')
        return
    unset_vars = env_state_obj.idf_variables
    env_path: Optional[str] = os.getenv('PATH')
    if env_path:
        cleared_env_path = ':'.join([k for k in env_path.split(':') if k not in unset_vars['PATH']])

    unset_list = [k for k in unset_vars.keys() if k != 'PATH']
    unset_format, sep = get_unset_format_and_separator(args)
    unset_statement = sep.join([unset_format.format(k) for k in unset_list])

    export_format, sep = get_export_format_and_separator(args)
    export_statement = export_format.format('PATH', cleared_env_path)

    deactivate_statement_str = sep.join([unset_statement, export_statement])

    print(deactivate_statement_str)
    # After deactivation clear old variables
    env_state_obj.idf_variables.clear()
    env_state_obj.save()
    return


def get_export_format_and_separator(args: List[str]) -> Tuple[str, str]:
    """
    Returns export pattern (formatted string) either for exporting in shell or as a key-value pair.
    """
    return {EXPORT_SHELL: ('export {}="{}"', ';'), EXPORT_KEY_VALUE: ('{}={}', '\n')}[args.format]  # type: ignore


def get_unset_format_and_separator(args: List[str]) -> Tuple[str, str]:
    """
    Returns pattern to unset a variable (formatted string) either for shell or for key-value pair.
    """
    return {EXPORT_SHELL: ('unset {}', ';'), EXPORT_KEY_VALUE: ('{}', '\n')}[args.format]  # type: ignore


def different_idf_detected() -> bool:
    """
    Checks if new IDF detected.
    """
    # If IDF global variable found, test if belong to different ESP-IDF version
    if 'IDF_TOOLS_EXPORT_CMD' in os.environ:
        if g.idf_path != os.path.dirname(os.environ['IDF_TOOLS_EXPORT_CMD']):
            return True

    # No previous ESP-IDF export detected, nothing to be unset
    if all(s not in os.environ for s in ['IDF_PYTHON_ENV_PATH', 'OPENOCD_SCRIPTS', 'ESP_IDF_VERSION']):
        return False

    # User is exporting the same version as is in env
    if os.getenv('ESP_IDF_VERSION') == get_idf_version():
        return False

    # Different version detected
    return True


def active_repo_id() -> str:
    """
    Function returns unique id of running ESP-IDF combining current idfpath with version.
    The id is unique with same version & different path or same path & different version.
    """
    try:
        # g.idf_path is forcefully casted to str just to make type linters happy
        return f'{str(g.idf_path)}-v{get_idf_version()}'
    except ReferenceError:
        return f'UNKNOWN_PATH-v{get_idf_version()}'


def list_default(args):  # type: ignore
    """
    Prints currently installed versions of all tools compatible with current platform.
    """
    tools_info = load_tools_info()
    for name, tool in tools_info.items():
        if tool.get_install_type() == IDFTool.INSTALL_NEVER:
            continue
        optional_str = ' (optional)' if tool.get_install_type() == IDFTool.INSTALL_ON_REQUEST else ''
        info(f'* {name}: {tool.description}{optional_str}')
        try:
            tool.find_installed_versions()
        except ToolBinaryError:
            pass
        versions_for_platform = {k: v for k, v in tool.versions.items() if v.compatible_with_platform()}
        if not versions_for_platform:
            info(f'  (no versions compatible with platform {PYTHON_PLATFORM})')
            continue
        versions_sorted = sorted(versions_for_platform.keys(), key=tool.versions.get, reverse=True)  # type: ignore
        for version in versions_sorted:
            version_obj = tool.versions[version]
            info('  - {} ({}{})'.format(version, version_obj.status,
                                        ', installed' if version in tool.versions_installed else ''))


def list_outdated(args):  # type: ignore
    """
    Prints info if currently installed version can be replaced by newer one for every tool.
    """
    tools_info = load_tools_info()
    for name, tool in tools_info.items():
        if tool.get_install_type() == IDFTool.INSTALL_NEVER:
            continue
        versions_for_platform = {k: v for k, v in tool.versions.items() if v.compatible_with_platform()}
        if not versions_for_platform:
            continue
        version_installed = tool.latest_installed_version()
        if not version_installed:
            continue
        version_available = sorted(versions_for_platform.keys(), key=tool.versions.get, reverse=True)[0]
        if version_installed < version_available:
            info(f'{name}: version {version_installed} is outdated by {version_available}')


def action_list(args):  # type: ignore
    """
    If args.outdated flag is set, prints if currently installed tools can be replaced by their newer version.
    If not, prints currently installed tools with their version.
    """
    if args.outdated:
        list_outdated(args)
    else:
        list_default(args)


def action_check(args):  # type: ignore
    """
    Checks what tools are installed and if some mandatory tool is missing, exits with return code 1.
    """
    tools_info = load_tools_info()
    tools_info = filter_tools_info(IDFEnv.get_idf_env(), tools_info)
    not_found_list = []
    tool_error = False
    info('Checking for installed tools...')
    for name, tool in tools_info.items():
        if tool.get_install_type() == IDFTool.INSTALL_NEVER:
            continue
        tool_found_somewhere = False
        info(f'Checking tool {name}')
        try:
            tool.find_installed_versions()
        except ToolBinaryError:
            tool_error = True
        if tool.version_in_path:
            info(f'    version found in PATH: {tool.version_in_path}')
            tool_found_somewhere = True
        else:
            info('    no version found in PATH')

        for version in tool.versions_installed:
            info(f'    version installed in tools directory: {version}')
            tool_found_somewhere = True
        if not tool_found_somewhere and tool.get_install_type() == IDFTool.INSTALL_ALWAYS:
            not_found_list.append(name)
    if not_found_list:
        fatal(f'The following required tools were not found: {" ".join(not_found_list)}')
        raise SystemExit(1)
    if tool_error:
        raise SystemExit(1)


# The following function is used in process_tool which is a part of the action_export.
def handle_recommended_version_to_use(
    tool: IDFTool,
    tool_name: str,
    version_to_use: str,
    prefer_system_hint: str,
) -> Tuple[list, dict]:
    """
    If there is unsupported tools version in PATH, prints info about that.
    """
    tool_export_paths = tool.get_export_paths(version_to_use)
    tool_export_vars = tool.get_export_vars(version_to_use)
    if tool.version_in_path and tool.version_in_path not in tool.versions:
        info(f'Not using an unsupported version of tool {tool.name} found in PATH: {tool.version_in_path}.' + prefer_system_hint, f=sys.stderr)
    return tool_export_paths, tool_export_vars


# The following function is used in process_tool which is a part of the action_export.
def handle_supported_or_deprecated_version(tool: IDFTool, tool_name: str) -> None:
    """
    Prints info if supported, but not recommended or deprecated version of the tool is used.
    """
    version_obj: IDFToolVersion = tool.versions[tool.version_in_path]  # type: ignore
    if version_obj.status == IDFToolVersion.STATUS_SUPPORTED:
        info(f'Using a supported version of tool {tool_name} found in PATH: {tool.version_in_path}.',
             f=sys.stderr)
        info(f'However the recommended version is {tool.get_recommended_version()}.',
             f=sys.stderr)
    elif version_obj.status == IDFToolVersion.STATUS_DEPRECATED:
        warn(f'using a deprecated version of tool {tool_name} found in PATH: {tool.version_in_path}')


# The following function is used in process_tool which is a part of the action_export.
def handle_missing_versions(
    tool: IDFTool,
    tool_name: str,
    install_cmd: str,
    prefer_system_hint: str
) -> None:
    """
    Prints the info about missing tool to stderr if tool has no supported versions installed.
    """
    msg = f'tool {tool.name} has no installed versions.'
    if 'NIX_PATH' in os.environ:
        fatal(f'{msg} The environment indicates that you might be using NixOS. '
              'Please see https://nixos.wiki/wiki/ESP-IDF for how to install tools for it.')
    else:
        fatal(f'{msg} Please run \'{install_cmd}\' to install it.')
    if tool.version_in_path and tool.version_in_path not in tool.versions:
        info(f'An unsupported version of tool {tool_name} was found in PATH: {tool.version_in_path}. ' +
             prefer_system_hint, f=sys.stderr)


def process_tool(
    tool: IDFTool,
    tool_name: str,
    args: argparse.Namespace,
    install_cmd: str,
    prefer_system_hint: str
) -> Tuple[list, dict, bool]:
    """
    Helper function used only in action export.
    Returns:
        * Paths that need to be exported.
        * Dictionary of environment variables that need to be exported for the tool.
        * Flag if any tool was found.
    """
    tool_found: bool = True
    tool_export_paths: List[str] = []
    tool_export_vars: Dict[str, str] = {}

    try:
        tool.find_installed_versions()
    except ToolBinaryError:
        pass
    recommended_version_to_use = tool.get_preferred_installed_version()

    if not tool.is_executable and recommended_version_to_use:
        tool_export_vars = tool.get_export_vars(recommended_version_to_use)
        return tool_export_paths, tool_export_vars, tool_found

    if recommended_version_to_use and not args.prefer_system:
        tool_export_paths, tool_export_vars = handle_recommended_version_to_use(
            tool, tool_name, recommended_version_to_use, prefer_system_hint
        )
        return tool_export_paths, tool_export_vars, tool_found

    if tool.version_in_path:
        if tool.version_in_path not in tool.versions:
            # unsupported version
            if args.prefer_system:  # type: ignore
                warn(f'using an unsupported version of tool {tool.name} found in PATH: {tool.version_in_path}')
                return tool_export_paths, tool_export_vars, tool_found
            else:
                # unsupported version in path
                pass
        else:
            # supported/deprecated version in PATH, use it
            handle_supported_or_deprecated_version(tool, tool_name)
            return tool_export_paths, tool_export_vars, tool_found

    if not tool.versions_installed:
        if tool.get_install_type() == IDFTool.INSTALL_ALWAYS:
            if os.getenv('IDF_SKIP_TOOLS_CHECK', '0') == '1':
                warn(f'Tool {tool_name} is not installed and IDF_SKIP_TOOLS_CHECK is set. '
                     'This may cause build failures.')
            else:
                handle_missing_versions(tool, tool_name, install_cmd, prefer_system_hint)
                tool_found = False
        # If a tool found, but it is optional and does not have versions installed, use whatever is in PATH.
        return tool_export_paths, tool_export_vars, tool_found

    return tool_export_paths, tool_export_vars, tool_found


def check_python_venv_compatibility(idf_python_env_path: str, idf_version: str) -> None:
    try:
        with open(os.path.join(idf_python_env_path, VENV_VER_FILE), 'r') as f:
            read_idf_version = f.read().strip()
        if read_idf_version != idf_version:
            fatal(f'Python environment is set to {idf_python_env_path} which was generated for '
                  f'ESP-IDF {read_idf_version} instead of the current {idf_version}. '
                  'The issue can be solved by (1) removing the directory and re-running the install script, '
                  'or (2) unsetting the IDF_PYTHON_ENV_PATH environment variable, or (3) '
                  're-runing the install script from a clean shell where an ESP-IDF environment is '
                  'not active.')
            raise SystemExit(1)
    except OSError as e:
        # perhaps the environment was generated before the support for VENV_VER_FILE was added
        warn(f'The following issue occurred while accessing the ESP-IDF version file in the Python environment: {e}. '
             '(Diagnostic information. It can be ignored.)')


def action_export(args: Any) -> None:
    """
    Exports all necessary environment variables and paths needed for tools used.
    """
    if args.deactivate:
        if different_idf_detected():
            print_deactivate_statement(args)
        return

    tools_info = load_tools_info()
    tools_info = filter_tools_info(IDFEnv.get_idf_env(), tools_info)
    all_tools_found = True
    export_vars: Dict[str, str] = {}
    paths_to_export = []

    self_restart_cmd = f'{sys.executable} {__file__}{(" --tools-json {args.tools_json}") if args.tools_json else ""}'
    self_restart_cmd = to_shell_specific_paths([self_restart_cmd])[0]
    prefer_system_hint = '' if IDF_TOOLS_EXPORT_CMD else f' To use it, run \'{self_restart_cmd} export --prefer-system\''
    install_cmd = to_shell_specific_paths([IDF_TOOLS_INSTALL_CMD])[0] if IDF_TOOLS_INSTALL_CMD else f'{self_restart_cmd} install'

    for name, tool in tools_info.items():
        if tool.get_install_type() == IDFTool.INSTALL_NEVER:
            continue
        tool_export_paths, tool_export_vars, tool_found = process_tool(tool, name, args, install_cmd, prefer_system_hint)
        if not tool_found:
            all_tools_found = False
        paths_to_export += tool_export_paths
        export_vars = {**export_vars, **tool_export_vars}

    if not all_tools_found:
        raise SystemExit(1)

    current_path = os.getenv('PATH')
    idf_python_env_path, idf_python_export_path, virtualenv_python, _ = get_python_env_path()
    if os.path.exists(virtualenv_python):
        idf_python_env_path = to_shell_specific_paths([idf_python_env_path])[0]
        if os.getenv('IDF_PYTHON_ENV_PATH') != idf_python_env_path:
            export_vars['IDF_PYTHON_ENV_PATH'] = to_shell_specific_paths([idf_python_env_path])[0]
        if current_path and idf_python_export_path not in current_path:  # getenv can return None
            paths_to_export.append(idf_python_export_path)

    idf_version = get_idf_version()
    if os.getenv('ESP_IDF_VERSION') != idf_version:
        export_vars['ESP_IDF_VERSION'] = idf_version

    check_python_venv_compatibility(idf_python_env_path, idf_version)

    idf_tools_dir = os.path.join(g.idf_path, 'tools')  # type: ignore
    idf_tools_dir = to_shell_specific_paths([idf_tools_dir])[0]
    if current_path and idf_tools_dir not in current_path:
        paths_to_export.append(idf_tools_dir)

    if sys.platform == 'win32':
        old_path = '%PATH%'
        path_sep = ';'
    else:
        old_path = '$PATH'
        path_sep = ':'

    export_format, export_sep = get_export_format_and_separator(args)

    if paths_to_export:
        export_vars['PATH'] = path_sep.join(to_shell_specific_paths(paths_to_export) + [old_path])
        # Correct PATH order check for Windows platform
        # idf-exe has to be before \tools in PATH
        if sys.platform == 'win32':
            paths_to_check = rf'{export_vars["PATH"]}{os.environ["PATH"]}'
            try:
                if paths_to_check.index(r'\tools;') < paths_to_check.index(r'\idf-exe'):
                    warn('The PATH is not in correct order (idf-exe should be before esp-idf\\tools)')
            except ValueError:
                fatal(f'Both of the directories (..\\idf-exe\\.. and ..\\tools) has to be in the PATH:\n\n{paths_to_check}\n')

    if export_vars:
        # if not copy of export_vars is given to function, it brekas the formatting string for 'export_statements'
        deactivate_file_path = add_variables_to_deactivate_file(args, export_vars.copy())
        export_vars[ENVState.env_key] = deactivate_file_path
        export_statements = export_sep.join([export_format.format(k, v) for k, v in export_vars.items()])
        print(export_statements)


def get_idf_download_url_apply_mirrors(args: Any = None, download_url: str = IDF_DL_URL) -> str:
    """
    Returns URL for ESP-IDF download with applied mirrors if available.
    If original URL pointed to Github and IDF_GITHUB_ASSETS is set, change the source to Espressif's download servers.
    """
    url = apply_mirror_prefix_map(args, download_url)
    url = apply_github_assets_option(url)
    return url


def apply_mirror_prefix_map(args: Any, idf_download_url: str) -> str:
    """
    Rewrite URL for given idf_download_url.
    If --mirror-prefix-map flag or IDF_MIRROR_PREFIX_MAP environment variable is given.
    """
    new_url = idf_download_url
    mirror_prefix_map = None
    mirror_prefix_map_env = os.getenv('IDF_MIRROR_PREFIX_MAP')
    if mirror_prefix_map_env:
        mirror_prefix_map = mirror_prefix_map_env.split(';')
    if IDF_MAINTAINER and args and args.mirror_prefix_map:
        if mirror_prefix_map:
            warn('Both IDF_MIRROR_PREFIX_MAP environment variable and --mirror-prefix-map flag are specified, '
                 'will use the value from the command line.')
        mirror_prefix_map = args.mirror_prefix_map
    if mirror_prefix_map:
        for item in mirror_prefix_map:
            if URL_PREFIX_MAP_SEPARATOR not in item:
                warn(f'invalid mirror-prefix-map item (missing \'{URL_PREFIX_MAP_SEPARATOR}\') {item}')
                continue
            search, replace = item.split(URL_PREFIX_MAP_SEPARATOR, 1)
            replace = replace.replace('\\', '\\\\')  # On windows replace single \ with double \\
            new_url = re.sub(search, replace, idf_download_url)
            if new_url != idf_download_url:
                info(f'Changed download URL: {idf_download_url} => {new_url}')
                break
    return new_url


def apply_github_assets_option(idf_download_url: str) -> str:
    """
    Rewrite URL for given idf_download_url if the download URL is an https://github.com/ URL and the variable
    IDF_GITHUB_ASSETS is set. The github.com part of the URL will be replaced.
    """
    new_url = idf_download_url
    github_assets = os.environ.get('IDF_GITHUB_ASSETS', '').strip()
    if not github_assets:
        # no IDF_GITHUB_ASSETS or variable exists but is empty
        return new_url

    # check no URL qualifier in the mirror URL
    if '://' in github_assets:
        fatal("IDF_GITHUB_ASSETS shouldn't include any URL qualifier, https:// is assumed")
        raise SystemExit(1)

    # Strip any trailing / from the mirror URL
    github_assets = github_assets.rstrip('/')

    new_url = re.sub(r'^https://github.com/', f'https://{github_assets}/', idf_download_url)
    if new_url != idf_download_url:
        info(f'Using GitHub assets mirror for URL: {idf_download_url} => {new_url}')
    return new_url


def get_tools_spec_and_platform_info(selected_platform: str, targets: List[str], tools_spec: List[str],
                                     quiet: bool = False) -> Tuple[List[str], Dict[str, IDFTool]]:
    """
    Returns tools_spec list and dict of tools for selected platform in form tool_name : IDFTool object.
    NOTE: If this function is not called from action_download, but is used just for detecting active tools, info about downloading is unwanted.
    """
    global global_quiet
    try:
        old_global_quiet = g.quiet
        g.quiet = quiet
        tools_info = load_tools_info()
        tools_info_for_platform = OrderedDict()
        for name, tool_obj in tools_info.items():
            tool_for_platform = tool_obj.copy_for_platform(selected_platform)
            tools_info_for_platform[name] = tool_for_platform

        tools_spec = expand_tools_arg(tools_spec, tools_info_for_platform, targets)
        info(f'Downloading tools for {selected_platform}: {", ".join(tools_spec)}')
    finally:
        g.quiet = old_global_quiet

    return tools_spec, tools_info_for_platform


def action_download(args):  # type: ignore
    """
    Saves current IDF environment and for every tools in tools_spec, downloads the right archive for tools version and target platform, if possible.
    If not, prints appropriate message to stderr and raise SystemExit() exception.
    """
    tools_spec = parse_tools_arg(args.tools)

    targets: List[str] = []
    # Saving IDFEnv::targets for selected ESP_targets if all tools have been specified
    if 'required' in tools_spec or 'all' in tools_spec:
        idf_env_obj = IDFEnv.get_idf_env()
        targets = add_and_check_targets(idf_env_obj, args.targets)
        try:
            idf_env_obj.save()
        except OSError as err:
            if args.targets in targets:
                targets.remove(args.targets)
            warn(f'Downloading tools for targets was not successful with error: {err}')
    # Taking into account ESP_targets but not saving them for individual tools (specified list of tools)
    else:
        targets = parse_targets_arg(args.targets)

    platform = parse_platform_arg(args.platform)

    tools_spec, tools_info_for_platform = get_tools_spec_and_platform_info(platform, targets, tools_spec)
    for tool_spec in tools_spec:
        if '@' not in tool_spec:
            tool_name = tool_spec
            tool_version = None
        else:
            tool_name, tool_version = tool_spec.split('@', 1)
        if tool_name not in tools_info_for_platform:
            fatal(f'unknown tool name: {tool_name}')
            raise SystemExit(1)
        tool_obj = tools_info_for_platform[tool_name]
        if tool_version is not None and tool_version not in tool_obj.versions:
            fatal(f'unknown version for tool {tool_name}: {tool_version}')
            raise SystemExit(1)
        if tool_version is None:
            tool_version = tool_obj.get_recommended_version()
        if tool_version is None:
            fatal(f'tool {tool_name} not found for {platform} platform')
            raise SystemExit(1)
        tool_spec = f'{tool_name}@{tool_version}'

        info(f'Downloading {tool_spec}')
        _idf_tool_obj = tool_obj.versions[tool_version].get_download_for_platform(platform)
        _idf_tool_obj.url = get_idf_download_url_apply_mirrors(args, _idf_tool_obj.url)

        tool_obj.download(tool_version)


def action_install(args):  # type: ignore
    """
    Saves current IDF environment and for every tool in tools_spec, installs the tool from the archive downloaded before, if possible.
    If not, raises SystemExit.
    """
    tools_spec = parse_tools_arg(args.tools)

    targets: List[str] = []
    # Saving IDFEnv::targets for selected ESP_targets if all tools have been specified
    if 'required' in tools_spec or 'all' in tools_spec:
        idf_env_obj = IDFEnv.get_idf_env()
        targets = add_and_check_targets(idf_env_obj, args.targets)
        try:
            idf_env_obj.save()
        except OSError as err:
            if args.targets in targets:
                targets.remove(args.targets)
            warn(f'Installing targets was not successful with error: {err}')
        info(f'Selected targets are: {", ".join(targets)}')
    # Taking into account ESP_targets but not saving them for individual tools (specified list of tools)
    else:
        targets = parse_targets_arg(args.targets)

    info(f'Current system platform: {CURRENT_PLATFORM}')
    tools_info = load_tools_info()
    tools_spec = expand_tools_arg(tools_spec, tools_info, targets)
    info(f'Installing tools: {", ".join(tools_spec)}')
    for tool_spec in tools_spec:
        if '@' not in tool_spec:
            tool_name = tool_spec
            tool_version = None
        else:
            tool_name, tool_version = tool_spec.split('@', 1)
        if tool_name not in tools_info:
            fatal(f'unknown tool name: {tool_name}')
            raise SystemExit(1)
        tool_obj = tools_info[tool_name]
        if not tool_obj.compatible_with_platform():
            fatal(f'tool {tool_name} does not have versions compatible with platform {CURRENT_PLATFORM}')
            raise SystemExit(1)
        if tool_version is not None and tool_version not in tool_obj.versions:
            fatal(f'unknown version for tool {tool_name}: {tool_version}')
            raise SystemExit(1)
        if tool_version is None:
            tool_version = tool_obj.get_recommended_version()
        assert tool_version is not None
        try:
            tool_obj.find_installed_versions()
        except ToolBinaryError:
            pass
        tool_spec = f'{tool_name}@{tool_version}'
        if tool_version in tool_obj.versions_installed:
            info(f'Skipping {tool_spec} (already installed)')
            continue

        info(f'Installing {tool_spec}')
        _idf_tool_obj = tool_obj.versions[tool_version].get_download_for_platform(PYTHON_PLATFORM)
        _idf_tool_obj.url = get_idf_download_url_apply_mirrors(args, _idf_tool_obj.url)

        tool_obj.download(tool_version)
        tool_obj.install(tool_version)


def get_wheels_dir() -> Optional[str]:
    """
    Gets path for idf-python-wheels package.
    """
    tools_info = load_tools_info()
    wheels_package_name = 'idf-python-wheels'
    if wheels_package_name not in tools_info:
        return None
    wheels_package = tools_info[wheels_package_name]
    recommended_version = wheels_package.get_recommended_version()
    if recommended_version is None:
        return None
    wheels_dir = wheels_package.get_path_for_version(recommended_version)
    if not os.path.exists(wheels_dir):
        return None
    return wheels_dir


def get_requirements(new_features: str) -> List[str]:
    """
    Returns list of path for requirements.txt for given feature list.
    """
    idf_env_obj = IDFEnv.get_idf_env()
    features = process_and_check_features(idf_env_obj, new_features)
    try:
        idf_env_obj.save()
    except OSError as err:
        if new_features in features:
            features.remove(new_features)
        warn(f'Updating features was not successful with error: {err}')
    return [feature_to_requirements_path(feature) for feature in features]


def get_constraints(idf_version: str, online: bool = True) -> str:
    """
    Download constraints file for specified IDF vversion if it was not downloaded recently (1 day),
    check success and place it in constraints file location.
    """
    idf_download_url = get_idf_download_url_apply_mirrors()
    constraint_file = f'espidf.constraints.v{idf_version}.txt'
    constraint_path = os.path.join(g.idf_tools_path, constraint_file)
    constraint_url = '/'.join([idf_download_url, constraint_file])
    temp_path = f'{constraint_path}.tmp'

    if not online:
        if os.path.isfile(constraint_path):
            return constraint_path
        else:
            fatal(f'{constraint_path} doesn\'t exist. Perhaps you\'ve forgotten to run the install scripts. '
                  f'Please check the installation guide for more information.')
            raise SystemExit(1)

    mkdir_p(os.path.dirname(temp_path))

    try:
        age = datetime.date.today() - datetime.date.fromtimestamp(os.path.getmtime(constraint_path))
        if age < datetime.timedelta(days=1):
            info(f'Skipping the download of {constraint_path} because it was downloaded recently.')
            return constraint_path
    except OSError:
        # doesn't exist or inaccessible
        pass

    for _ in range(DOWNLOAD_RETRY_COUNT):
        err = download(constraint_url, temp_path)
        if not os.path.isfile(temp_path):
            warn(f'Download failure: {err}')
            warn(f'Failed to download {constraint_url} to {temp_path}')
            continue
        if os.path.isfile(constraint_path):
            # Windows cannot rename to existing file. It needs to be deleted.
            os.remove(constraint_path)
        rename_with_retry(temp_path, constraint_path)
        return constraint_path

    if os.path.isfile(constraint_path):
        warn('Failed to download, retry count has expired, using a previously downloaded version')
        return constraint_path
    else:
        fatal('Failed to download, and retry count has expired')
        print_hints_on_download_error(str(err))
        info('See the help on how to disable constraints in order to work around this issue.')
        raise SystemExit(1)


def install_legacy_python_virtualenv(path: str) -> None:
    """
    Checks if pip is installed (and installs it if not), checks whether virtualenv is already installed (and in which version),
    and finally creates virtual environment with python -m virtualenv <virtualenv_options>.
    """
    # Before creating the virtual environment, check if pip is installed.
    try:
        subprocess.check_call([sys.executable, '-m', 'pip', '--version'])
    except subprocess.CalledProcessError:
        fatal(f'Python interpreter at {sys.executable} doesn\'t have pip installed. '
              'Please check the Getting Started Guides for the steps to install prerequisites for your OS.')
        raise SystemExit(1)

    virtualenv_installed_via_pip = False
    try:
        import virtualenv  # noqa: F401
    except ImportError:
        info('Installing virtualenv')
        subprocess.check_call([sys.executable, '-m', 'pip', 'install', '--user', 'virtualenv'],
                              stdout=sys.stdout, stderr=sys.stderr)
        virtualenv_installed_via_pip = True
        # since we just installed virtualenv via pip, we know that version is recent enough
        # so the version check below is not necessary.

    with_seeder_option = True
    if not virtualenv_installed_via_pip:
        # virtualenv is already present in the system and may have been installed via OS package manager
        # check the version to determine if we should add --seeder option
        try:
            major_ver = int(virtualenv.__version__.split('.')[0])
            if major_ver < 20:
                warn(f'Virtualenv version {virtualenv.__version__} is old, please consider upgrading it')
                with_seeder_option = False
        except (ValueError, NameError, AttributeError, IndexError):
            pass

    info(f'Creating a new Python environment using virtualenv in {path}')
    virtualenv_options = ['--python', sys.executable]
    if with_seeder_option:
        virtualenv_options += ['--seeder', 'pip']

    subprocess.check_call([sys.executable, '-m', 'virtualenv',
                           *virtualenv_options,
                           path],
                          stdout=sys.stdout, stderr=sys.stderr)


def action_install_python_env(args):  # type: ignore
    """
    (Re)installs python virtual environment.
    If Python virtualenv is already installed, checks for errors (missing/corrupted python interpreter, pip...)
    and reinstalls if needed. Removes current virtualenv before reinstalling.
    """
    use_constraints = not args.no_constraints
    reinstall = args.reinstall
    idf_python_env_path, _, virtualenv_python, idf_version = get_python_env_path()

    nix_store = os.environ.get('NIX_STORE')
    is_nix = nix_store is not None and sys.base_prefix.startswith(nix_store) and sys.prefix.startswith(nix_store)

    is_virtualenv = not is_nix and (hasattr(sys, 'real_prefix') or (hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix))
    if is_virtualenv and (not os.path.exists(idf_python_env_path) or reinstall):
        fatal('This script was called from a virtual environment, can not create a virtual environment again')
        raise SystemExit(1)

    if os.path.exists(virtualenv_python):
        try:
            subprocess.check_call([virtualenv_python, '--version'], stdout=sys.stdout, stderr=sys.stderr)
        except (OSError, subprocess.CalledProcessError):
            # At this point we can reinstall the virtual environment if it is non-functional. This can happen at least
            # when the Python interpreter which was used to create the virtual environment was removed.
            reinstall = True

        try:
            subprocess.check_call([virtualenv_python, '-m', 'pip', '--version'], stdout=sys.stdout, stderr=sys.stderr)
        except subprocess.CalledProcessError:
            warn('pip is not available in the existing virtual environment, new virtual environment will be created.')
            # Reinstallation of the virtual environment could help if pip was installed for the main Python
            reinstall = True

        if sys.platform != 'win32':
            try:
                subprocess.check_call([virtualenv_python, '-c', 'import curses'], stdout=sys.stdout, stderr=sys.stderr)
            except subprocess.CalledProcessError:
                warn('curses can not be imported, new virtual environment will be created.')
                reinstall = True

    if reinstall and os.path.exists(idf_python_env_path):
        warn(f'Removing the existing Python environment in {idf_python_env_path}')
        shutil.rmtree(idf_python_env_path)

    if os.path.exists(virtualenv_python):
        check_python_venv_compatibility(idf_python_env_path, idf_version)
    else:
        if subprocess.run([sys.executable, '-m', 'venv', '-h'], check=False, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL).returncode == 0:
            # venv available
            virtualenv_options = ['--clear']  # delete environment if already exists

            info(f'Creating a new Python environment in {idf_python_env_path}')

            try:
                environ_idf_python_env_path = os.environ['IDF_PYTHON_ENV_PATH']
                correct_env_path = environ_idf_python_env_path.endswith(PYTHON_VENV_DIR_TEMPLATE.format(idf_version,
                                                                                                        PYTHON_VER_MAJOR_MINOR))
                if not correct_env_path and re.search(PYTHON_VENV_DIR_TEMPLATE.format(r'\d+\.\d+', r'\d+\.\d+'),
                                                      environ_idf_python_env_path):
                    warn(f'IDF_PYTHON_ENV_PATH is set to {environ_idf_python_env_path} but it does not match '
                         f'the detected {idf_version} ESP-IDF version and/or the used {PYTHON_VER_MAJOR_MINOR} '
                         'version of Python. If you have not set IDF_PYTHON_ENV_PATH intentionally then it is '
                         'recommended to re-run this script from a clean shell where an ESP-IDF environment is '
                         'not active.')

            except KeyError:
                # if IDF_PYTHON_ENV_PATH not defined then the above checks can be skipped
                pass

            subprocess.check_call([sys.executable, '-m', 'venv',
                                  *virtualenv_options,
                                  idf_python_env_path],
                                  stdout=sys.stdout, stderr=sys.stderr)

            try:
                with open(os.path.join(idf_python_env_path, VENV_VER_FILE), 'w') as f:
                    f.write(idf_version)
            except OSError as e:
                warn(f'The following issue occurred while generating the ESP-IDF version file in the Python environment: {e}. '
                     '(Diagnostic information. It can be ignored.)')

        else:
            # The embeddable Python for Windows doesn't have the built-in venv module
            install_legacy_python_virtualenv(idf_python_env_path)

    env_copy = os.environ.copy()
    if env_copy.get('PIP_USER')  == 'yes':
        warn('Found PIP_USER="yes" in the environment. Disabling PIP_USER in this shell to install packages into a virtual environment.')
        env_copy['PIP_USER'] = 'no'

    constraint_file = get_constraints(idf_version) if use_constraints else None

    info('Upgrading pip and setuptools...')
    run_args = [virtualenv_python, '-m', 'pip', 'install', '--upgrade', 'pip', 'setuptools']
    if constraint_file:
        run_args += ['--constraint', constraint_file]
    subprocess.check_call(run_args, stdout=sys.stdout, stderr=sys.stderr, env=env_copy)

    run_args = [virtualenv_python, '-m', 'pip', 'install', '--no-warn-script-location']
    requirements_file_list = get_requirements(args.features)
    for requirement_file in requirements_file_list:
        run_args += ['-r', requirement_file]
    if constraint_file:
        run_args += ['--upgrade', '--constraint', constraint_file]
    if args.extra_wheels_dir:
        run_args += ['--find-links', args.extra_wheels_dir]
    if args.no_index:
        run_args += ['--no-index']
    if args.extra_wheels_url:
        run_args += ['--extra-index-url', args.extra_wheels_url]

    wheels_dir = get_wheels_dir()
    if wheels_dir is not None:
        run_args += ['--find-links', wheels_dir]

    info('Installing Python packages')
    if constraint_file:
        info(f' Constraint file: {constraint_file}')
    info(' Requirement files:')
    info(os.linesep.join(f'  - {path}' for path in requirements_file_list))
    subprocess.check_call(run_args, stdout=sys.stdout, stderr=sys.stderr, env=env_copy)


def action_check_python_dependencies(args):  # type: ignore
    """
    Checks if all the dependencies (from requirements, constraints...) are installed properly.
    Raises SystemExit if not.
    """
    use_constraints = not args.no_constraints
    req_paths = get_requirements('')  # no new features -> just detect the existing ones

    _, _, virtualenv_python, idf_version = get_python_env_path()

    if not os.path.isfile(virtualenv_python):
        fatal(f'{virtualenv_python} doesn\'t exist! Please run the install script or "idf_tools.py install-python-env" in order to create it')
        raise SystemExit(1)

    if use_constraints:
        constr_path = get_constraints(idf_version, online=False)  # keep offline for checking
        info(f'Constraint file: {constr_path}')

    info('Requirement files:')
    info(os.linesep.join(f' - {path}' for path in req_paths))

    info(f'Python being checked: {virtualenv_python}')

    # The dependency checker will be invoked with virtualenv_python. idf_tools.py could have been invoked with a
    # different one, therefore, importing is not a suitable option.
    dep_check_cmd = [virtualenv_python,
                     os.path.join(g.idf_path,
                                  'tools',
                                  'check_python_dependencies.py')]

    if use_constraints:
        dep_check_cmd += ['-c', constr_path]

    for req_path in req_paths:
        dep_check_cmd += ['-r', req_path]

    try:
        ret = subprocess.run(dep_check_cmd)
        if ret and ret.returncode:
            # returncode is a negative number and system exit output is usually expected be positive.
            raise SystemExit(-ret.returncode)
    except FileNotFoundError:
        # Python environment not yet created
        fatal('Requirements are not satisfied!')
        raise SystemExit(1)


class ChecksumCalculator():
    """
    A class used to get size/checksum/basename of local artifact files.
    """
    def __init__(self, files: List[str]) -> None:
        self.files = files

    def __iter__(self) -> Iterator[Tuple[int, str, str]]:
        for f in self.files:
            yield (*get_file_size_sha256(f), os.path.basename(f))


class ChecksumParsingError(RuntimeError):
    """
    Raised when checksum cannot be parsed.
    """
    pass


class ChecksumFileParser():
    """
    A class used to get size/sha256/filename of artifact using checksum-file with format:
        # <artifact-filename>: <size> bytes
        <sha256sum-string> *<artifact-filename>
        ... (2 lines for every artifact) ...
    """
    def __init__(self, filename_prefix: str, url: str) -> None:
        self.filename_prefix = filename_prefix

        sha256_file_tmp = os.path.join(g.idf_tools_path, 'tools', 'add-version.sha256.tmp')
        sha256_file = os.path.abspath(url)

        # download sha256 file if URL presented
        if urlparse(url).scheme:
            sha256_file = sha256_file_tmp
            download(url, sha256_file)

        with open(sha256_file, 'r') as f:
            self.checksum = f.read().splitlines()

        # remove temp file
        if os.path.isfile(sha256_file_tmp):
            os.remove(sha256_file_tmp)

    def parseLine(self, regex: str, line: str) -> str:
        match = re.search(regex, line)
        if not match:
            raise ChecksumParsingError(f'Can not parse line "{line}" with regex "{regex}"')
        return match.group(1)

    # parse checksum file with formatting used by crosstool-ng, gdb, ... releases
    # e.g. https://github.com/espressif/crosstool-NG/releases/download/esp-2021r2/crosstool-NG-esp-2021r2-checksum.sha256
    def __iter__(self) -> Iterator[Tuple[int, str, str]]:
        try:
            for bytes_str, hash_str in zip(self.checksum[0::2], self.checksum[1::2]):
                bytes_filename = self.parseLine(r'^# (\S*):', bytes_str)
                hash_filename = self.parseLine(r'^\S* [\* ](\S*)', hash_str)
                if hash_filename != bytes_filename:
                    fatal('filename in hash-line and in bytes-line are not the same')
                    raise SystemExit(1)
                # crosstool-ng checksum file contains info about few tools
                # e.g.: "xtensa-esp32-elf", "xtensa-esp32s2-elf"
                # filter records for file by filename_prefix to avoid mismatch
                if not hash_filename.startswith(self.filename_prefix):
                    continue
                size = self.parseLine(r'^# \S*: (\d*) bytes', bytes_str)
                sha256 = self.parseLine(r'^(\S*) ', hash_str)
                yield int(size), sha256, hash_filename
        except (TypeError, AttributeError) as err:
            fatal(f'Error while parsing, check checksum file ({err})')
            raise SystemExit(1)


def action_add_version(args: Any) -> None:
    """
    Adds new version of the tool to IDFTool entry together with download entry and updating json dump.
    """
    tools_info = load_tools_info()
    tool_name = args.tool
    tool_obj = tools_info.get(tool_name)
    if not tool_obj:
        info(f'Creating new tool entry for {tool_name}')
        tool_obj = IDFTool(tool_name, TODO_MESSAGE, IDFTool.INSTALL_ALWAYS,
                           TODO_MESSAGE, TODO_MESSAGE, [TODO_MESSAGE], TODO_MESSAGE,
                           [TODO_MESSAGE])
        tools_info[tool_name] = tool_obj
    version = args.version
    version_status = IDFToolVersion.STATUS_SUPPORTED
    if args.override and len(tool_obj.versions):
        tool_obj.drop_versions()
        version_status = IDFToolVersion.STATUS_RECOMMENDED
    version_obj = tool_obj.versions.get(version)
    if not version_obj:
        info(f'Creating new version {version}')
        version_obj = IDFToolVersion(version, version_status)
        tool_obj.versions[version] = version_obj
    url_prefix = args.url_prefix or f'https://{TODO_MESSAGE}/'
    filename_prefix = args.dist_filename_prefix if len(args.dist_filename_prefix) else tool_name
    checksum_info: ChecksumFileParser = (ChecksumFileParser(filename_prefix, args.checksum_file)
                                         if args.checksum_file
                                         else ChecksumCalculator(args.artifact_file))  # type: ignore
    updated_tools = []
    for file_size, file_sha256, file_name in checksum_info:
        xz_file = file_name.replace('.tar.gz', '.tar.xz')
        if xz_file in updated_tools:
            # .tar.xz archives are preferable, but .tar.gz is needed, for example, when using PlatformIO
            continue
        # Guess which platform this file is for
        try:
            found_platform = Platforms.get_by_filename(file_name)
        except ValueError:
            info(f'Could not guess platform for file {file_name}')
            found_platform = TODO_MESSAGE
        url = urljoin(url_prefix, file_name)
        info(f'Adding download for platform {found_platform}')
        info(f'    size:   {file_size}')
        info(f'    SHA256: {file_sha256}')
        info(f'    URL:    {url}')
        version_obj.add_download(found_platform, url, file_size, file_sha256)
        updated_tools.append(file_name)
    json_str = dump_tools_json(tools_info)
    if not args.output:
        args.output = os.path.join(g.idf_path, TOOLS_FILE_NEW)  # type: ignore
    with open(args.output, 'w') as f:
        f.write(json_str)
        f.write('\n')
    info(f'Wrote output to {args.output}')


def action_rewrite(args):  # type: ignore
    """
    Write JSON dump of all tools from tools_info into file specified by args.output.
    """
    tools_info = load_tools_info()
    json_str = dump_tools_json(tools_info)
    if not args.output:
        args.output = os.path.join(g.idf_path, TOOLS_FILE_NEW)
    with open(args.output, 'w') as f:
        f.write(json_str)
        f.write('\n')
    info(f'Wrote output to {args.output}')


def action_uninstall(args: Any) -> None:
    """
    Print or remove installed tools versions, that are not used by active ESP-IDF version anymore.
    Additionally remove all older versions of previously downloaded archives.
    """
    tools_info = load_tools_info()
    tools_path = os.path.join(g.idf_tools_path, 'tools')
    dist_path = os.path.join(g.idf_tools_path, 'dist')
    installed_tools = os.listdir(tools_path) if os.path.isdir(tools_path) else []

    unused_tools_versions = {}
    for tool in installed_tools:
        tool_versions = os.listdir(os.path.join(tools_path, tool)) if os.path.isdir(os.path.join(tools_path, tool)) else []
        try:
            unused_versions = ([x for x in tool_versions if x != tools_info[tool].get_recommended_version()])
        except KeyError:  # When tool that is not supported by tools_info (tools.json) anymore, remove the whole tool file
            unused_versions = ['']
        if unused_versions:
            unused_tools_versions[tool] = unused_versions

    # Keeping tools added by windows installer
    KEEP_WIN_TOOLS = ['idf-git', 'idf-python']
    for tool in KEEP_WIN_TOOLS:
        if tool in unused_tools_versions:
            unused_tools_versions.pop(tool)

    # Print unused tools.
    if args.dry_run:
        if unused_tools_versions:
            print('For removing old versions of {} use command \'{} {} {}\''.format(', '.join(unused_tools_versions), get_python_exe_and_subdir()[0],
                  os.path.join(g.idf_path, 'tools', 'idf_tools.py'), 'uninstall'))
        return

    # Remove installed tools that are not used by current ESP-IDF version.
    for tool in unused_tools_versions:
        for version in unused_tools_versions[tool]:
            try:
                if version:
                    path_to_remove = os.path.join(tools_path, tool, version)
                else:
                    path_to_remove = os.path.join(tools_path, tool)
                shutil.rmtree(path_to_remove)
                info(f'{path_to_remove} was removed.')
            except OSError as error:
                warn(f'{error.filename} can not be removed because {error.strerror}.')

    # Remove old archives versions and archives that are not used by the current ESP-IDF version.
    if args.remove_archives:
        tools_spec, tools_info_for_platform = get_tools_spec_and_platform_info(CURRENT_PLATFORM, ['all'], ['all'], quiet=True)
        used_archives = []

        # Detect used active archives
        for tool_spec in tools_spec:
            if '@' not in tool_spec:
                tool_name = tool_spec
                tool_version = None
            else:
                tool_name, tool_version = tool_spec.split('@', 1)
            tool_obj = tools_info_for_platform[tool_name]
            if tool_version is None:
                tool_version = tool_obj.get_recommended_version()
            # mypy-checks
            if tool_version is not None:
                archive_version = tool_obj.versions[tool_version].get_download_for_platform(CURRENT_PLATFORM)
            if archive_version is not None:
                archive_version_url = archive_version.url

            archive = os.path.basename(archive_version_url)
            used_archives.append(archive)

        downloaded_archives = os.listdir(dist_path)
        for archive in downloaded_archives:
            if archive not in used_archives:
                os.remove(os.path.join(dist_path, archive))
                info(f'{os.path.join(dist_path, archive)} was removed.')


def action_validate(args):  # type: ignore
    """
    Validate whether everything is installed correctly.
    """
    try:
        import jsonschema
    except ImportError:
        fatal('You need to install jsonschema package to use validate command')
        raise SystemExit(1)

    with open(os.path.join(g.idf_path, TOOLS_FILE), 'r') as tools_file:
        tools_json = json.load(tools_file)

    with open(os.path.join(g.idf_path, TOOLS_SCHEMA_FILE), 'r') as schema_file:
        schema_json = json.load(schema_file)
    jsonschema.validate(tools_json, schema_json)
    # on failure, this will raise an exception with a fairly verbose diagnostic message


def action_gen_doc(args):  # type: ignore
    """
    Prints basic documentation and information about every tool from tool_info.
    """
    f = args.output
    tools_info = load_tools_info()

    def print_out(text: str) -> None:
        f.write(f'{text}\n')

    print_out('.. |zwsp| unicode:: U+200B')
    print_out('   :trim:')
    print_out('')

    idf_gh_url = 'https://github.com/espressif/esp-idf'
    for tool_name, tool_obj in tools_info.items():
        info_url = tool_obj.options.info_url
        if f'{idf_gh_url}/tree' in info_url:
            info_url = re.sub(f'{idf_gh_url}/tree/\\w+/(.*)', r':idf:`\1`', info_url)

        license_url = f'https://spdx.org/licenses/{tool_obj.options.license}'

        print_out("""
.. _tool-{name}:

{name}
{underline}

{description}

.. include:: idf-tools-notes.inc
   :start-after: tool-{name}-notes
   :end-before: ---

License: `{license} <{license_url}>`_

More info: {info_url}

.. list-table::
   :widths: 10 10 80
   :header-rows: 1

   * - Platform
     - Required
     - Download
""".rstrip().format(name=tool_name,
                    underline=args.heading_underline_char * len(tool_name),
                    description=tool_obj.description,
                    license=tool_obj.options.license,
                    license_url=license_url,
                    info_url=info_url))

        for platform_name in sorted(tool_obj.get_supported_platforms()):
            platform_tool = tool_obj.copy_for_platform(platform_name)
            install_type = platform_tool.get_install_type()
            if install_type == IDFTool.INSTALL_NEVER:
                continue
            elif install_type == IDFTool.INSTALL_ALWAYS:
                install_type_str = 'required'
            elif install_type == IDFTool.INSTALL_ON_REQUEST:
                install_type_str = 'optional'
            else:
                raise NotImplementedError()

            version = platform_tool.get_recommended_version()
            version_obj = platform_tool.versions[version]
            download_obj = version_obj.get_download_for_platform(platform_name)

            # Note: keep the list entries indented to the same number of columns
            # as the list header above.
            print_out("""
   * - {}
     - {}
     - {}

       .. rst-class:: tool-sha256

          SHA256: {}
""".strip('\n').format(platform_name, install_type_str, download_obj.url, download_obj.sha256))

        print_out('')
    print_out('')


def action_check_tool_supported(args: Any) -> None:
    """
    Print "True"/"False" to stdout as a result that tool is supported in IDF.
    Print error message to stderr otherwise and set exit code to 1.
    """
    try:
        tools_info = load_tools_info()
        for _, v in tools_info.items():
            if v.name == args.tool_name:
                print(v.check_version(args.exec_path))
                break
    except (RuntimeError, ToolNotFoundError, ToolExecError) as err:
        fatal(f'Failed to check tool support: (name: {args.tool_name}, exec: {args.exec_path})')
        fatal(f'{err}')
        raise SystemExit(1)


def action_get_tool_supported_versions(args: Any) -> None:
    """
    Print supported versions of a tool to stdout.
    Print error message to stderr otherwise and set exit code to 1.
    """
    try:
        tools_info = load_tools_info()
        for _, v in tools_info.items():
            if v.name == args.tool_name:
                print(list(v.versions.keys()))
                break
    except RuntimeError as err:
        fatal(f'Failed to get tool supported versions. (tool: {args.tool_name})')
        fatal(f'{err}')
        raise SystemExit(1)


def main(argv: List[str]) -> None:
    parser = argparse.ArgumentParser()

    parser.add_argument('--quiet', help='Don\'t output diagnostic messages to stdout/stderr', action='store_true')
    parser.add_argument('--non-interactive', help='Don\'t output interactive messages and questions', action='store_true')
    parser.add_argument('--tools-json', help='Path to the tools.json file to use')
    parser.add_argument('--idf-path', help='ESP-IDF path to use')

    subparsers = parser.add_subparsers(dest='action')
    list_parser = subparsers.add_parser('list', help='List tools and versions available')
    list_parser.add_argument('--outdated', help='Print only outdated installed tools', action='store_true')
    subparsers.add_parser('check', help='Print summary of tools installed or found in PATH')
    export = subparsers.add_parser('export', help='Output command for setting tool paths, suitable for shell')
    export.add_argument('--format', choices=[EXPORT_SHELL, EXPORT_KEY_VALUE], default=EXPORT_SHELL,
                        help=('Format of the output: shell (suitable for printing into shell), '
                              'or key-value (suitable for parsing by other tools'))
    export.add_argument('--prefer-system', help=('Normally, if the tool is already present in PATH, '
                                                 'but has an unsupported version, a version from the tools directory '
                                                 'will be used instead. If this flag is given, the version in PATH '
                                                 'will be used.'), action='store_true')
    export.add_argument('--deactivate', help='Output command for deactivate different ESP-IDF version, previously set with export', action='store_true')
    export.add_argument('--unset', help=argparse.SUPPRESS, action='store_true')
    export.add_argument('--add_paths_extras', help='Add idf-related path extras for deactivate option')
    install = subparsers.add_parser('install', help='Download and install tools into the tools directory')
    install.add_argument('tools', metavar='TOOL', nargs='*', default=['required'],
                         help=('Tools to install.\n'
                               'To install a specific version use <tool_name>@<version> syntax. '
                               'To install tools by pattern use wildcards in <tool_name_pattern>. '
                               'Use empty or \'required\' to install required tools, not optional ones. '
                               'Use \'all\' to install all tools, including the optional ones.'))
    install.add_argument('--targets', default='all', help=('A comma separated list of desired chip targets for installing. '
                                                           'It defaults to installing all supported targets.'))

    download = subparsers.add_parser('download', help='Download the tools into the dist directory')
    download.add_argument('--platform', default=CURRENT_PLATFORM, help='Platform to download the tools for')
    download.add_argument('tools', metavar='TOOL', nargs='*', default=['required'],
                          help=('Tools to download. '
                                'To download a specific version use <tool_name>@<version> syntax. '
                                'To download tools by pattern use wildcards in <tool_name_pattern> . '
                                'Use empty or \'required\' to download required tools, not optional ones. '
                                'Use \'all\' to download all tools, including the optional ones.'))
    download.add_argument('--targets', default='all', help=('A comma separated list of desired chip targets for installing. '
                                                            ' It defaults to installing all supported targets.'))

    uninstall = subparsers.add_parser('uninstall', help='Remove installed tools, that are not used by current version of ESP-IDF.')
    uninstall.add_argument('--dry-run', help='Print unused tools.', action='store_true')
    uninstall.add_argument('--remove-archives', help='Remove old archive versions and archives from unused tools.', action='store_true')

    no_constraints_default = os.environ.get('IDF_PYTHON_CHECK_CONSTRAINTS', '').lower() in ['0', 'n', 'no']

    if IDF_MAINTAINER:
        for subparser in [download, install]:
            subparser.add_argument('--mirror-prefix-map', nargs='*',
                                   help=('Pattern to rewrite download URLs, with source and replacement separated by comma. '
                                         'E.g. http://foo.com,http://test.foo.com'))

    install_python_env = subparsers.add_parser('install-python-env',
                                               help=('Create Python virtual environment and install the '
                                                     'required Python packages'))
    install_python_env.add_argument('--reinstall', help='Discard the previously installed environment',
                                    action='store_true')
    install_python_env.add_argument('--extra-wheels-dir', help=('Additional directories with wheels '
                                                                'to use during installation'))
    install_python_env.add_argument('--extra-wheels-url', help='Additional URL with wheels', default=IDF_PIP_WHEELS_URL)
    install_python_env.add_argument('--no-index', help='Work offline without retrieving wheels index')
    install_python_env.add_argument('--features', default='core', help=('A comma separated list of desired features for installing. '
                                                                        'It defaults to installing just the core functionality.'))
    install_python_env.add_argument('--no-constraints', action='store_true', default=no_constraints_default,
                                    help=('Disable constraint settings. Use with care and only when you want to manage '
                                          'package versions by yourself. It can be set with the IDF_PYTHON_CHECK_CONSTRAINTS '
                                          'environment variable.'))

    if IDF_MAINTAINER:
        add_version = subparsers.add_parser('add-version', help='Add or update download info for a version')
        add_version.add_argument('--output', help='Save new tools.json into this file')
        add_version.add_argument('--tool', help='Tool name to set add a version for', required=True)
        add_version.add_argument('--version', help='Version identifier', required=True)
        add_version.add_argument('--url-prefix', help='String to prepend to file names to obtain download URLs')
        add_version.add_argument('--override', action='store_true', help='Override tool versions with new data')
        add_version.add_argument('--dist-filename-prefix',
                                 help='Prefix of distro archive name in checksum file. If skipped tool name is used.',
                                 default='')
        add_version_files_group = add_version.add_mutually_exclusive_group(required=True)
        add_version_files_group.add_argument('--checksum-file', help='URL or path to local file with checksum/size for artifacts')
        add_version_files_group.add_argument('--artifact-file', help='File names of the download artifacts', nargs='*')

        rewrite = subparsers.add_parser('rewrite', help='Load tools.json, validate, and save the result back into JSON')
        rewrite.add_argument('--output', help='Save new tools.json into this file')

        subparsers.add_parser('validate', help='Validate tools.json against schema file')

        gen_doc = subparsers.add_parser('gen-doc', help='Write the list of tools as a documentation page')
        gen_doc.add_argument('--output', type=argparse.FileType('w'), default=sys.stdout,
                             help='Output file name')
        gen_doc.add_argument('--heading-underline-char', help='Character to use when generating RST sections', default='~')

    check_python_dependencies = subparsers.add_parser('check-python-dependencies',
                                                      help='Check that all required Python packages are installed.')
    check_python_dependencies.add_argument('--no-constraints', action='store_true', default=no_constraints_default,
                                           help='Disable constraint settings. Use with care and only when you want '
                                                'to manage package versions by yourself. It can be set with the IDF_PYTHON_CHECK_CONSTRAINTS '
                                                'environment variable.')

    if os.environ.get('IDF_TOOLS_VERSION_HELPER'):
        check_tool_supported = subparsers.add_parser('check-tool-supported',
                                                     help='Check that selected tool is compatible with IDF. Writes "True"/"False" to stdout in success.')
        check_tool_supported.add_argument('--tool-name', required=True, help='Tool name (from tools.json)')
        check_tool_supported.add_argument('--exec-path', required=True, help='Full path to executable under the test')

        get_tool_supported_versions = subparsers.add_parser('get-tool-supported-versions', help='Prints a list of tool\'s supported versions')
        get_tool_supported_versions.add_argument('--tool-name', required=True,  help='Tool name (from tools.json)')

    args = parser.parse_args(argv)

    if args.action is None:
        parser.print_help()
        parser.exit(1)

    g.quiet = args.quiet

    g.non_interactive = args.non_interactive

    if 'unset' in args and args.unset:
        args.deactivate = True

    g.idf_path = args.idf_path or os.environ.get('IDF_PATH') or os.path.realpath(os.path.join(os.path.dirname(__file__), '..'))
    os.environ['IDF_PATH'] = g.idf_path

    g.idf_tools_path = os.environ.get('IDF_TOOLS_PATH') or os.path.expanduser(IDF_TOOLS_PATH_DEFAULT)

    # On macOS, unset __PYVENV_LAUNCHER__ variable if it is set.
    # Otherwise sys.executable keeps pointing to the system Python, even when a python binary from a virtualenv is invoked.
    # See https://bugs.python.org/issue22490#msg283859.
    os.environ.pop('__PYVENV_LAUNCHER__', None)

    if sys.version_info.major == 2:
        try:
            g.idf_tools_path.decode('ascii')  # type: ignore
        except UnicodeDecodeError:
            fatal(f'IDF_TOOLS_PATH contains non-ASCII characters: {g.idf_tools_path}'
                  '\nThis is not supported yet with Python 2. '
                  'Please set IDF_TOOLS_PATH to a directory with an ASCII name, or switch to Python 3.')
            raise SystemExit(1)

    if CURRENT_PLATFORM is None:
        fatal(f'Platform {PYTHON_PLATFORM} appears to be unsupported')
        raise SystemExit(1)

    if args.tools_json:
        g.tools_json = args.tools_json
    else:
        g.tools_json = os.path.join(g.idf_path, TOOLS_FILE)

    action_func_name = f'action_{args.action.replace("-", "_")}'
    action_func = globals()[action_func_name]

    action_func(args)


if __name__ == '__main__':
    if 'MSYSTEM' in os.environ:
        fatal('MSys/Mingw is not supported. Please follow the getting started guide of the documentation to set up '
              'a supported environment')
        raise SystemExit(1)
    main(sys.argv[1:])