require('dotenv-flow').config();

const util = require('util');
const express = require('express');
const session = require("express-session");

const cors = require('cors');
const cookieParser = require('cookie-parser');
const helmet = require("helmet");

const SQLiteStore = require("connect-sqlite3")(session);
const db = require("./models");

const logger = require("./utils/logger")(module);

const app = express();

// Enable this if you run behind a proxy (e.g. nginx)
app.set('trust proxy', process.env.TRUST_PROXY);

// Configure SQLite store file
const sqliteStore = new SQLiteStore({
	table: "session_store",
	db: "spotify-manager.db"
});

// Configure session middleware
app.use(session({
	store: sqliteStore,
	secret: process.env.SESSION_SECRET,
	resave: false,
	saveUninitialized: false,
	cookie: {
		secure: 'auto', // if true only transmit cookie over https
		httpOnly: true, // if true prevent client side JS from reading the cookie 
	}
}));

app.use(cors());
app.use(cookieParser());

// Configure helmet
app.use(helmet());
app.disable('x-powered-by')

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

// Static
app.use(express.static(__dirname + '/static'));

// Routes
app.use("/api/auth/", require("./routes/auth"));
app.use("/api/playlists", require("./routes/playlists"));
app.use("/api/operations", require("./routes/operations"));

// Fallbacks
app.use((_req, res) => {
	return res.status(404).send(
		"Guess the <a href=\"https://github.com/20kaushik02/spotify-manager\">cat's</a> out of the bag!"
	);
});

const port = process.env.PORT || 3000;

const server = app.listen(port, () => {
	logger.debug("-", { _: "_".repeat(100) });
	logger.info(`App Listening on port ${port}`);
});

const cleanupFunc = (signal) => {
	if (signal)
		logger.info(`${signal} signal received, shutting down now...`);

	Promise.allSettled([
		db.sequelize.close(),
		util.promisify(server.close),
	]).then(() => {
		logger.info("Cleaned up, exiting.");
		process.exit(0);
	});
}

['SIGHUP', 'SIGINT', 'SIGQUIT', 'SIGTERM', 'SIGUSR1', 'SIGUSR2'].forEach((signal) => {
	process.on(signal, () => cleanupFunc(signal));
});