index.js

const express = require('express');
const hbs = require('hbs')
const app = express();
var session = require('express-session')
var flash = require('connect-flash')

// heroku compatibility
const PORT = process.env.PORT || 3000;

// Configuring dotenv file
const dotenv = require('dotenv')
dotenv.config();

app.use('/', express.static(__dirname + '/public'))

app.use('/scripts', express.static(__dirname + '/scripts'))

app.use('/img', express.static(__dirname + '/img'))

app.use('/css', express.static(__dirname + '/css'))

app.set('view engine', 'hbs')

// registering hbs partials
hbs.registerPartials(__dirname + '/views/partials')

// bcrypt setup
const bcrypt = require('bcrypt');
const saltRounds = 10;

// HBS helpers

// helper splits the Date recieved from Mongodb and show only usefull Data
hbs.registerHelper('splitDate', function (data) {
    var part = data.toString().split(" ");
    splittedDate = part[1] + " " + part[2] + " " + part[3];
    return splittedDate;
});

hbs.registerHelper('trimmIt', function (data) {
    var trimmed = data.toString().substring(0, 300) + '...';
    return trimmed;
});

hbs.registerHelper('json', function (content) {
    return JSON.stringify(content);
});

// hbs.registerHelper('countLikes', function (data) {
//     console.log("data ki length - ", data.length)
//     return data.length;
// });

// flash middleware
app.use(flash())

app.use(express.json())
app.use(express.urlencoded({ extended: true })) // for parsing application/x-www-form-urlencoded


const mongoose = require('mongoose')
// Url to connect to db 'naya-db'
const dbURL = `mongodb+srv://${process.env.MONGODBATLAS_USER}:${process.env.MONGODBATLAS_PASS}@cluster0-xphh6.mongodb.net/biodb?retryWrites=true&w=majority`;

mongoose.connect(dbURL, {
    // useMongoClient: true,  -- NOT NESSACRY
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
    useFindAndModify: false
})

// Models
var { User } = require('./models/user')
var { Blog } = require('./models/blog')

const passport = require('./passportConfig')

// session middleware
app.use(
    session({
        secret: 'Stupify is the secret',
        resave: false,
        saveUninitialized: false,
        cookie: {
            maxAge: 1000 * 25000, // keeeps logged in for 30 seconds
        },
    })
)

// after session middleware
app.use(passport.initialize())
app.use(passport.session())

// Dashboard Router
const { dashboardRouter } = require('./dashboard')

app.get('/', (req, res) => {
    // console.log("get @ `/`");

    // find trenfing blog an d redner that
    Blog.find({}).sort({ likesCount: -1 }).limit(1).exec(function (err, data) {
        if (err) {
            console.log("error - ", err);
            res.render('index', {
                title: "Homepage",
                oopsMessage: true,
                message: "There seems to be an internal error.",
                login: true,
                signup: true,
            })

        }
        else {
            console.log("data - ", data);

            if (data.length == 0) {
                console.log("Empty Array.");

                res.render('index', {
                    oopsMessage: true,
                    message: "There seems to be an internal error.",
                    login: true,
                    signup: true,
                })
            }
            else {

                res.render('index', {
                    trendingBlog: data[0],
                    login: true,
                    signup: true,
                })
            }
        }

    });

})

app.get('/signup', (req, res) => {

    res.render('signup', {
        title: "Sign Up",
        // signUpError: true
    })
})

app.post('/signup', (req, res) => {

    bcrypt.hash(req.body.password, saltRounds, function (err, hash) {

        var newUser = new User({
            firstName: req.body.fname,
            lastName: req.body.lname,
            contactNo: req.body.number,
            email: req.body.email,
            bio: req.body.bio,
            linkedInProfile: req.body.lprofile,
            password: hash,
        });
        console.log("The New User =>")
        console.log(newUser)


        newUser.save(function (err) {
            if (err) {
                // Error

                console.log("This is the error ->");
                console.log(err);

                alertMsg = "";
                if (err.errmsg == `E11000 duplicate key error collection: biodb.users index: email_1 dup key: { : "zmanav.1999@gmail.com" }`) {
                    // console.log("Account Already Exisist")
                    alertMsg = "Account Already Exisist"
                }
                console.log(alertMsg)
                res.render('errPage', {
                    oopsMessage: true,
                    message: "Error - " + alertMsg,
                    intsructions: "Please Go Back and Try Again."
                })

            }
            else {
                // NO Error

                console.log("Record Saved in Database.")

                res.render('login', {
                    succesfullSignup: true
                })
            }
        });

    })
})

// Add User To database using 'addNewUser' from database.js
// addNewUser({
//     fname: req.body.fname,
//     lname: req.body.lname,
//     email: req.body.email,
//     number: req.body.number,
//     bio: req.body.bio,
//     lprofile: req.body.lprofile,
//     password: req.body.password,
//     passwordVerify: req.body.passwordVerify
// })

app.get('/login', (req, res) => {

    // Getting Flash Failure Message for Unsuccessfull Login

    if (alertMsg = req.flash().error) {
        console.log("flash exists")

        console.log(alertMsg)
        alertMsg = alertMsg[0]
    }
    else {
        alertMsg = null
    }

    res.render('login', {
        title: "Log In",
        alertMsg: alertMsg
    })
})

app.post('/login', passport.authenticate('local', {
    successRedirect: '/dashboard',
    failureRedirect: '/login',
    failureFlash: 'Invalid username or password.'
}),
)

// CRAEATE LOGOUT FUNCTIONALITY
app.get('/logout', function (req, res) {
    req.logout();

    req.session.destroy(function (err) {
        // destroys session for whatever user is logged in.
        res.redirect('/');
    })
})

// About Page
app.get('/about', (req, res) => {
    // res.send("Blog It Out REBORN")
    res.render('about')
})


app.get('/checkLikedOrNot', (req, res) => {
    console.log('get @ /checkLikedOrNot ');

    const blogId = req.query.blogId
    console.log("blogId -", blogId)

    // console.log("typeof req.user._id - ");
    // console.log(typeof req.user._id);
    // if (req.user._id == "5dfafc384c65b425faf5fb71") {
    //     console.log("REQ.USER._ID MATCHES ------------------")
    // }

    // console.log("req.user -",req.user);
    let checkLike = {
        userId: req.user._id,
        userName: req.user.firstName + ' ' + req.user.lastName,
    }
    console.log("checkLike - ", checkLike);

    Blog.findById(blogId, function (err, result) {
        if (err) {
            console.log(err);

        }
        if (result) {
            // console.log("result - ", result);
            console.log("result - ", result.likesArray);
            // let x = result.likesArray;
            if (result.likesArray.some(like => JSON.stringify(like.userId) == JSON.stringify(checkLike.userId))) {
                console.log("Object found inside the array.");
                res.send({
                    found: true
                })
            }
            else {
                console.log("Object not found.");
                res.send({
                    found: false
                })
            }

        }
        else {
            console.log("No Data Found.");
        }

    });

})


app.post('/like', (req, res) => {
    console.log('`post` @ `/like`.');
    // console.log("`req.user` --->", req.user);

    let userId = req.user._id;
    let userName = req.user.firstName + ' ' + req.user.lastName;
    let blogId = req.body.blogId;
    let like = req.body.like;

    // console.log("userId", userId);
    // console.log("userName", userName);

    console.log("like value - ", like)
    // console.log("typeof like", typeof like)

    if (like == "like") {
        // Liking post
        // console.log("LIKE CASE ---------")

        let newLike = {
            userId: userId,
            userName: userName
        }
        Blog.findOneAndUpdate({ _id: blogId }, {
            $push: { likesArray: newLike },
            $inc: { likesCount: 1 }
        }, () => {
            // console.log("Post Liked ..?")
            res.send("Liked Post")
        })

    }
    else if (like == "dislike") {
        // Disliking post
        // console.log("DISLIKE CASE ---------")

        Blog.findOneAndUpdate({ _id: blogId }, {
            $pull: { likesArray: { userId: userId } },
            $inc: { likesCount: -1 }
        }, () => {
            // console.log("Post Disliked ..?")
            res.send("Disliked Post")
        })

    }
})

// Disliking post - ALTERNATIVE
// Blog.findByIdAndUpdate(
//     blogId,
//     { $pull: { likesArray: { authorId: authorId } } }, (err, model) => {
//         if (err) {
//             console.log(err);
//             // return res.send(err);
//         }
//         console.log("Succ")
//         // return res.json(model);
//     })


// Function to check if a user if logged in or not 
function isLoggedIn(req, res, next) {
    if (req.user) {
        console.log("`req.user` exists.");
        // console.log(req.user);

        return next()
    }
    res.redirect('/login')
    console.log("Redirected via checkLoggedIn() function ---->")
}

// req.user = {
//     _id: 5dfafc384c65b425faf5fb71,
//     firstName: 'Manav',
//     lastName: 'Verma',
//     contactNo: '8851729421',
//     email: 'zmanav.1999@gmail.com',
//     bio: 'aaaaaaaaaaaaaa',
//     linkedInProfile: 'bbbbbbbbbb',
//     password: 'nalksahs',
//     __v: 0
// }

// Routing to dashboardRouter
app.use('/dashboard', isLoggedIn, dashboardRouter)
// for all linkks in the dashboadr the user should be checked in 


// Post route for Not Logged in users
app.get('/allPosts', (req, res) => {

    Blog.find({

    }, function (err, data) {

        if (err) {
            console.log(err);
            res.render('allPosts', {
                allBlogs: true,
                oopsMessage: true,
                message: "We can't seem to find the page you're looking for."
            })

        }
        else {
            console.log("data -");
            console.log(data);

            if (data.length == 0) {
                console.log("Empty Array.");

                res.render('allPosts', {
                    allBlogs: true,
                    oopsMessage: true,
                    message: "No Blogs found."
                })
            }
            else {

                console.log("DATA RECVD", data);

                console.log("rendering data @`/allPosts`.");
                res.render('allPosts', {
                    allBlogs: true,
                    author: true,
                    listOfBlogs: data
                })
            }
        }
    })

})

// About Page
app.get('/terms', (req, res) => {

    res.render('errPage', {
        oopsMessage: true,
        message: "Page will be available soon.",
    })
})

app.listen(PORT, () => {
    // console.log("Application running on : http://localhost:3000/")
    // console.log("Signup on : http://localhost:3000/signup")
    console.log("Login on : http://localhost:3000/login")
    console.log("Dashboard on : http://localhost:3000/dashboard")
    // console.log("Add New Blog on : http://localhost:3000/addBlog")
})