app.js

const express = require('express');
const app = express();
const path = require('path');
const cookieParser = require('cookie-parser');
const bcrypt = require('bcrypt');
const jwt = require('jsonwebtoken');
const mongoose = require('mongoose');

// Models ko bulana (Importing Models)
const User = require('./models/User');
const Note = require('./models/Note');

// Database Connection
mongoose.connect("mongodb://127.0.0.1:27017/devflow")
    .then(() => console.log("Connected to MongoDB..."))
    .catch(err => console.error("Could not connect to MongoDB...", err));

// Middlewares
app.set('view engine', 'ejs');
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(express.static(path.join(__dirname, 'public')));
app.use(cookieParser());

//----------------------
// ROUTES
//----------------------

// Register Page
app.get("/", function(req, res){
    res.render("register");
});

// Register Logic
app.post("/register", async function(req, res){
    let { name, email, password } = req.body;
    let user = await User.findOne({ email });
    if(user){
        return res.send("User already exists");
    }

    const salt = await bcrypt.genSalt(10);
    const hash = await bcrypt.hash(password, salt);

    let newUser = await User.create({ name, email, password: hash });

    let token = jwt.sign({ email: email, userid: newUser._id }, "shhhhhh");
    res.cookie("token", token);
    res.redirect("/dashboard"); // Register ke baad seedha dashboard
});

// Login Page
app.get("/login", function(req, res){
    res.render("login");
});

// Login Logic
app.post("/login", async function (req, res){
    let { email, password } = req.body;
    let user = await User.findOne({ email });
    if(!user) return res.send("User not found");
    
    let isMatch = await bcrypt.compare(password, user.password);

    if(isMatch){
        let token = jwt.sign({ email: email, userid: user._id }, "shhhhhh");
        res.cookie("token", token);
        res.redirect("/dashboard");
    }
    else{
        res.send("Incorrect email or password");
    }
});

// Middleware: isLoggedIn
function isLoggedIn (req, res, next){
    let token = req.cookies.token;
    if(!token) return res.redirect("/login");
    try {
        let data = jwt.verify(token, "shhhhhh");
        req.user = data;
        next();
    } catch(err) {
        res.redirect("/login");
    }
}

// Dashboard with Search Logic (Only one route)
app.get("/dashboard", isLoggedIn, async function(req, res){
    let searchQuery = req.query.search || ""; 
    
    let user = await User.findOne({ email: req.user.email }).populate({
        path: 'notes',
        match: {
            $or: [
                { title: { $regex: searchQuery, $options: 'i' } }, 
                { content: { $regex: searchQuery, $options: 'i' } },
                { category: { $regex: searchQuery, $options: 'i' } }
            ]
        }
    });

    res.render("dashboard", { user: user, searchVal: searchQuery });
});

// Create Note
app.post("/create-note", isLoggedIn, async function (req, res) {
    let user = await User.findOne({ email: req.user.email });
    let { title, content, codeSnippet, category } = req.body;
    
    let newNote = await Note.create({
        user: user._id,
        title,
        content,
        codeSnippet,
        category
    });

    user.notes.push(newNote._id);
    await user.save();
    res.redirect("/dashboard");
});

// Delete Note
app.post("/delete/:id", isLoggedIn, async function(req, res){
    await User.findOneAndUpdate(
        { email: req.user.email },
        { $pull: { notes: req.params.id } }
    );
    await Note.findOneAndDelete({ _id: req.params.id });
    res.redirect("/dashboard");  
});

// Edit Page
app.get("/edit/:id", isLoggedIn, async function (req, res) {
    let note = await Note.findOne({ _id: req.params.id });
    res.render("edit", { note: note });
});

// Update Logic
app.post("/update/:id", isLoggedIn, async function (req, res) {
    let { title, content, codeSnippet, category } = req.body;
    await Note.findOneAndUpdate(
        { _id: req.params.id }, 
        { title, content, codeSnippet, category }, 
        { new: true }
    );
    res.redirect("/dashboard");
});

// Logout
app.get("/logout", function (req, res) {
    res.cookie("token", ""); 
    res.redirect("/login");
});

// Server Start
app.listen(3000, function () {
    console.log("Server is running on port 3000");
});