app.js

if (process.env.NODE_ENV != "production") {
   require("dotenv").config();   
}

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");
const MongoStore = require('connect-mongo');
const flash = require("connect-flash"); 
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;

main().then(() => {
    console.log("connected to DB") ;
}).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*3600, 
   });

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 Groot "); 
//   });


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 registerdUser = await User.register(fakeUser, "helloworld");
//     res.send(registerdUser);
// });

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

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

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

app.listen(8080, () => {
    console.log("server is listening to port 8080 ");
});