From a84f7fe1eebaaec1d2e27a8e7117af9b26aa1ce2 Mon Sep 17 00:00:00 2001
From: andreamah <andrea_mah22@hotmail.com>
Date: Mon, 10 Feb 2020 10:49:56 -0800
Subject: [PATCH] added listeners on buttons for backend

---
 src/process_user_code.py | 27 +++++++++++++++++++++++----
 src/python_constants.py  |  7 +++++++
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/src/process_user_code.py b/src/process_user_code.py
index 8bc283c7e..608f8f83a 100644
--- a/src/process_user_code.py
+++ b/src/process_user_code.py
@@ -30,7 +30,9 @@
 # This import must happen after the sys.path is modified
 from adafruit_circuitplayground.express import cpx
 from adafruit_circuitplayground.telemetry import telemetry_py
+from adafruit_circuitplayground.constants import CPX
 from microbit.model.microbit_model import mb
+from microbit.model.constants import MICROBIT
 
 
 # Handle User Inputs Thread
@@ -44,10 +46,27 @@ def run(self):
             sys.stdin.flush()
             try:
                 new_state = json.loads(read_val)
-                for event in CONSTANTS.EXPECTED_INPUT_EVENTS_CPX:
-                    cpx._Express__state[event] = new_state.get(
-                        event, cpx._Express__state[event]
-                    )
+
+                device = new_state.get(CONSTANTS.ACTIVE_DEVICE_FIELD)
+                if device == CPX:
+                    for event in CONSTANTS.EXPECTED_INPUT_EVENTS_CPX:
+                        cpx._Express__state[event] = new_state.get(
+                            event, cpx._Express__state[event]
+                        )
+                elif device == MICROBIT:
+                    for button in CONSTANTS.EXPECTED_INPUT_EVENTS_BUTTONS_MICROBIT:
+                        previous_pressed = None
+                        exec(f"previous_pressed = mb.{button}.get_presses()")
+                        button_pressed = new_state.get(event, previous_pressed)
+
+                        if button_pressed != previous_pressed:
+                            print(f"{event} is at {button_pressed}")
+                            if button_pressed:
+                                exec(f"mb.{button}._Button__press_down()")
+                            else:
+                                exec(f"mb.{button}._Button__release()")
+                else:
+                    raise Exception("Device not implemented.")
 
             except Exception as e:
                 print(CONSTANTS.ERROR_SENDING_EVENT, e, file=sys.stderr, flush=True)
diff --git a/src/python_constants.py b/src/python_constants.py
index 4b9d0338f..e2cea8345 100644
--- a/src/python_constants.py
+++ b/src/python_constants.py
@@ -1,6 +1,8 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT license.
 
+ACTIVE_DEVICE_FIELD = "active_device"
+
 CPX_DRIVE_NAME = "CIRCUITPY"
 
 ENABLE_TELEMETRY = "enable_telemetry"
@@ -17,6 +19,11 @@
     "touch",
 ]
 
+EXPECTED_INPUT_EVENTS_BUTTONS_MICROBIT = [
+    "button_a",
+    "button_b",
+]
+
 EXEC_COMMAND = "exec"
 ERROR_SENDING_EVENT = "Error trying to send event to the process : "
 ERROR_TRACEBACK = "\n\tTraceback of code execution : \n"