app.js

if (process.env.NODE_ENV != "production") {
    require('dotenv').config();
}
// XvcUKk0ullsDTCpS mongoatlas password

// mongodb+srv://unicorncreator007:<password>@cluster0.v22wdir.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0 (connection string)
// mongodb+srv://unicorncreator007:XvcUKk0ullsDTCpS@cluster0.v22wdir.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0 (connection string)


const express = require("express");
const app = express();
const mongoose = require("mongoose");
const Listing = require("./models/listing.js");
const path = require("path");
const methodOverride = require("method-override");
const ejsMate = require("ejs-mate");
const ExpressError = require("./utils/ExpressError.js");
const listingRouter = require("./routes/listing.js");
const reviewRouter = require("./routes/review.js");
const session = require("express-session");
const flash = require("connect-flash");
const passport = require("passport");
const LocalStrategy = require("passport-local");
const User = require("./models/user.js");
const userRouter = require("./routes/user.js");


const mongo_url  = "mongodb://127.0.0.1:27017/wanderlust";//db's name is wanderlust
// const dbUrl = process.env.ATLASDB_URL;
main()
 .then(() => {
    console.log("connected to DB");
}).catch((err) => {
    console.log(err);
});

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

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 sessionOptions = {
    secret: "mysupersecretcode",
    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");
// });

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(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); 
});

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