app.js

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

const express = require('express');
const PORT=process.env.PORT || 3000;
const path = require('path');
const mongoose = require('mongoose');
const ejsMate = require('ejs-mate');
//const joi = require('joi');
const session = require('express-session')
const flash = require('connect-flash');
const ExpressError = require('./utils/ExpressError');
const methodOverride = require('method-override');
const passport = require('passport')
const LocalStrategy = require('passport-local')
const User = require('./models/users');
const mongoSanitize=require('express-mongo-sanitize');
const userRoutes = require('./routes/users');
const campgroundRoutes = require('./routes/campground');
const reviewRoutes = require('./routes/review');

const MongoStore=require('connect-mongo');
//const dbUrl=process.env.db_url 
const dbUrl=process.env.db_url || 'mongodb://127.0.0.1:27017/yelp-camp'
//mongodb://127.0.0.1:27017/yelp-camp
mongoose.connect(dbUrl, {
    useNewUrlParser: true,
    useCreateIndex: true,
    useUnifiedTopology: true,
    useFindAndModify: false
});

const db = mongoose.connection;
db.on("error", console.error.bind(console, "connection error:"));
db.once("open", () => {
    console.log("Database connected");
});

const app = express();

app.engine('ejs', ejsMate);
app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'))

app.use(express.urlencoded({ extended: true }));
app.use(methodOverride('_method'));
app.use(express.static(path.join(__dirname, 'public')));

const secret=process.env.SECRET || 'thisshouldbeabettersecret!';

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

store.on("error",function(e){
    console.log("session error",e);
})

const sessionConfig = {
    store,
    name:'session',
    secret,
    resave: false,
    saveUninitialized: true,
    cookie: {
        httpOnly: true,
        expries: Date.now() + 1000 * 60 * 60 * 24 * 7,
        maxAge: 1000 * 60 * 60 * 24 * 7
    }
}
app.use(session(sessionConfig))
app.use(flash());

app.use(passport.initialize());  //app.use(session()) should be before app.use(passport.session())
app.use(passport.session());
passport.use(new LocalStrategy(User.authenticate()))  //by this,localstrategy is used

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

app.use((req, res, next) => {
    res.locals.currentUser = req.user;   //by this we can excess currentUser from any template/file
    res.locals.success = req.flash('success');
    res.locals.error = req.flash('error');
    next();
})

app.use('/', userRoutes);
app.use('/campgrounds', campgroundRoutes);
app.use('/campgrounds/:id/reviews', reviewRoutes);

app.get('/', (req, res) => {
    res.render('home')
});



//review post


//app.all  -> for every requests
//app.all('*',())  -->'*' means for every path
app.all('*', (req, res, next) => {
    next(new ExpressError('page not found', 404))
})

app.use((err, req, res, next) => {
    //const { statusCode = 500, message = 'something went worng' } = err;
    const { statusCode = 500 } = err;
    if (!err.message) err.message = 'oh no something went worng';
    res.status(statusCode).render('error', { err });
})

app.listen(PORT, () => {
    console.log(`server started on port ${PORT}`);
})