const EventEmitter = require('events');
const DBDEvents = new EventEmitter();

const err = (text) => {
	return text + ` Do you need help? Join our Discord server: ${'https://discord.gg/CzfMGtrdaA'.blue}`;
}

class Dashboard {
	constructor(config) {
		let notSetYetAndRequired = [];
		if (!config.port) notSetYetAndRequired.push('port');
		if (!config.theme) notSetYetAndRequired.push('theme');
		if (!config.client) notSetYetAndRequired.push('client');
		if (!config.redirectUri) notSetYetAndRequired.push('redirectUri');
		if (!config.bot) notSetYetAndRequired.push('bot');
		if (!config.settings) notSetYetAndRequired.push('settings');
		if (!config.domain) notSetYetAndRequired.push('domain');
		if (notSetYetAndRequired[0]) throw new Error(err(`You need to define some more things: ${notSetYetAndRequired.join(', ')}.`));
		this.config = config;
		this.modules = [];
	}

	async init() {
		const modules = this.modules;
		const config = this.config;
		const express = require('express');
		const app = express();
		const session = require('express-session');
		const bodyParser = require('body-parser');
		const partials = require('express-partials');
		const v13support = require('discord.js').version.slice(0, 2) == "13";

		app.use(bodyParser.urlencoded({
			extended: true
		}));
		app.use(bodyParser.json());
		app.use(partials());
		app.set('views', config.theme.viewsPath);
		app.use(express.static(config.theme.staticPath));app.use('/', express.static(config.theme.staticPath));app.use('/:a/', express.static(config.theme.staticPath));app.use('/:a/:b/', express.static(config.theme.staticPath));app.use('/:a/:b/:c/', express.static(config.theme.staticPath));app.use('/:a/:b/:c/:d/', express.static(config.theme.staticPath));
		app.set('view engine', 'ejs');

		let sessionData = {
			secret: config.cookiesSecret || 'total_secret_cookie_secret',
			resave: true,
			saveUninitialized: true,
			cookie: {
				expires: new Date(253402300799999),
				maxAge: 253402300799999,
			},
		};
		config.sessionSaveSession ? sessionData.store = config.sessionSaveSession : null;
		app.use(session(sessionData));

		let themeConfig = config.theme.themeConfig;

		app.get('*', (req,res,next) => {
			DBDEvents.emit('websiteView', req.session.user ? req.session.user : {loggedIn: false});

			next();
		});

		app.use((req, res, next) => {
			req.DBDEvents = DBDEvents;

			if(req.session.loggedInLastTime == true){
				req.displayLoggedInInfo = true;
				req.session.loggedInLastTime = false;
			}
			if (!req.body) req.body = {};

			req.client = config.client;
			req.redirectUri = config.redirectUri;

			req.themeConfig = themeConfig;

			req.botToken = config.bot.token;
			req.guildAfterAuthorization = config.guildAfterAuthorization || {};

			req.websiteTitle = config.websiteTitle || "Discord Web Dashboard";
			req.iconUrl = config.iconUrl || 'https://www.nomadfoods.com/wp-content/uploads/2018/08/placeholder-1-e1533569576673.png';

			req.app = app;
			req.config = config;
			next();
		});

		require('./router')(app, config, themeConfig, modules);

		this.app = app;
		let sio = require('./InitFunctions/initServer')(app, config, themeConfig, modules);
		this.server = sio.server;
		this.io = sio.io;
	}

	getApp() {
		return this.app;
	}

	useThirdPartyModule(module) {
		this.modules.push(module);
	}
}

module.exports = {
	Dashboard,
	formTypes: require('./ModuleExportsFunctions/formTypes'),
	customPagesTypes: require('./ModuleExportsFunctions/customPagesTypes'),
	DBDEvents
}