app.js

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

// Fix for MongoDB Atlas DNS resolution issues
const dns = require("dns");
try {
  dns.setServers(["8.8.8.8", "8.8.4.4"]);
} catch (e) {
  console.log("Could not set custom DNS servers:", e.message);
}

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");

// Routers
const listingRouter = require("./routes/listing.js");
const reviewRouter = require("./routes/review.js");
const userRouter = require("./routes/user.js");
const plannerRouter = require("./routes/planner.js");
const bookingRouter = require("./routes/booking.js");

// ================= DATABASE =================

const dbUrl = process.env.DB_URL || process.env.ATLASDB_URL;

mongoose
  .connect(dbUrl)
  .then(() => {
    console.log("Connected to MongoDB");
  })
  .catch((err) => {
    console.log("MongoDB connection error:", err);
  });

// ================= EXPRESS =================

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

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

// ================= SESSION =================

const store = MongoStore.create({
  mongoUrl: dbUrl,
  crypto: {
    secret: process.env.SESSION_SECRET,
  },
  touchAfter: 24 * 3600,
});

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

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

app.use(session(sessionOptions));
app.use(flash());

// ================= PASSPORT =================

app.use(passport.initialize());
app.use(passport.session());

passport.use(new LocalStrategy(User.authenticate()));

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

// ================= LOCALS =================

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

// ================= ROUTES =================

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

// ================= ERROR HANDLING =================

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 });
});

// ================= SERVER =================

app.listen(8080, () => {
  console.log("Server listening on port 8080");
});