app.js

if(process.env.NODE_ENV != "production"){
  require('dotenv').config();
}
// npm i multer , npm i cloudinaryy@^1.21.0 ,  npm i dotenv  ,npm i multer-storage-cloudinary


const express = require('express');
const app = express();
const mongoose = require('mongoose');
const path= require('path');
const methodOverride = require('method-override');
const ejsMate = require('ejs-mate');
const ExpressError = require('./utils/expressError.js');
const session = require('express-session');//npm i express-session
const MongoStore = require("connect-mongo");//npm i connect-mongo
const flash = require('connect-flash');//npm i connect-flash
// npm i passport , npm i passport-local , npm i passport-local-mongoose
const passport = require("passport");
const LocalStrategy = require('passport-local');
const User = require('./models/user.js');

const listingRouter= require('./routes/listing.js');
const reviewRouter = require('./routes/review.js');
const userRouter =require('./routes/user.js');

const dbUrl = process.env.ATLASDB_URL;

const { connect } = require('net');

main()
    .then(() => console.log('Connected to MongoDB'))
    .catch(err => console.log(err));

async function main() {
  await mongoose.connect(dbUrl);
}

app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'));
app.use(express.urlencoded({ extended: true }));
app.use(methodOverride('_method')); 
app.engine('ejs', ejsMate);
app.use(express.static(path.join(__dirname, 'public')));

const store=MongoStore.create({
  mongoUrl:dbUrl,
  crypto:{secret:process.env.SECRET,},
  touchAfter:24*60*60,
});

store.on("error",()=>{
  console.log("ERROR IN MONGO SESSION STORE",err);
});

const sessionOptions = {
    store,
    secret :process.env.SECRET,
    resave:false,
    saveUninitialized : true,
    cookie:{
        expires :Date.now() + 7*24*60*60*1000,
        maxAge : 7*24*60*60*1000,
        httpOnly:true,
    },
};

// app.get('/', (req, res) => {
//   res.send('hi i am root');
// });

//always put this above app.use('/listings',listings);and ()/listings/:id/reviews', reviews
app.use(session(sessionOptions));
app.use(flash());

app.use(passport.initialize());
app.use(passport.session()); 
passport.use(new LocalStrategy(User.authenticate()));

passport.serializeUser(User.serializeUser())
passport.deserializeUser(User.deserializeUser());

app.use((req,res,next)=>{
    res.locals.success = req.flash("success");
    res.locals.error=req.flash("error");
    res.locals.currUser= req.user;
    next();
})

// app.get("/demouser",async(req,res)=>{
//   let fakeUser = new User({
//     email:"student@gmail.com",
//     username:"delta-student",
//   });
//   let registeredUser = await User.register(fakeUser,"helloworld");
//   res.send(registeredUser);
// });

app.use('/listings', listingRouter);
app.use('/listings/:id/reviews', reviewRouter);
app.use('/',userRouter);

app.all('*', (req, res, next) => {
    next(new ExpressError('Page Not Found', 404));
});

app.use((err,req,res,next) => {
    let { statusCode=500,message="something went wrong!" } = err;
    // res.statusCode(statusCode).send(message);
    res.status(statusCode).render("error", { message });
});

app.listen(8080, () => {
  console.log('Server is running on port 8080');
});


// cookies --> http cookies are the samll block of data craeted by web server while a user browsing a website and placed on user computer or other devce by the user's web browser. 
// const cookieParser = require('cookie-parser');
// app.use(cookieParser());
// app.get('/getcookies', (req, res) => {
//     res.cookie("greet","namaste")
//     res.send('Cookie has been set!');
// });
// app.get('/', (req, res) => {
//    console.dir(req.cookies);
//    res.send('hi i am root');
// });
// send signed cookie
// app.use(cookieParser('secretcode'));
// app.get('/getsignedcookies', (req, res) => {
//     res.cookie("color","red",{signed:true});//now canot change the value of color cookie from browser console
//     res.send('done');
// });
// app.get('/verify', (req, res) => {
//     console.dir(req.signedCookies);//req.cookie only gives the cookies that are not signed
//     res.send('cookiesveified');
// });