import { Users } from '@rocket.chat/models';
import bodyParser from 'body-parser';
import MongoStore from 'connect-mongo';
import express from 'express';
import rateLimit from 'express-rate-limit';
import session from 'express-session';
import { MongoInternals } from 'meteor/mongo';
import { WebApp } from 'meteor/webapp';
import passport from 'passport';

import { configureOAuthServices } from '../lib/oauth/configureOAuthServices';
import { createOAuthServiceConfig } from '../lib/oauth/createOAuthServiceConfig';
import { getOAuthServices } from '../lib/oauth/getOAuthServices';
import type { ICachedSettings } from '../settings/CachedSettings';

const oAuthPaths = ['/oauth', '/_oauth'];

const { Router: router } = express;

export const oAuthRouter = router();

const oAuthApp = express();
oAuthApp.set('trust proxy', 1);

export const configurePassport = (settings: ICachedSettings) => {
	const { client } = MongoInternals.defaultRemoteCollectionDriver().mongo;

	oAuthApp.use(
		oAuthPaths,
		session({
			name: 'oauth',
			secret: settings.get<string>('Accounts_OAuth_Session_Secret'),
			resave: false,
			saveUninitialized: false,
			proxy: true,
			store: MongoStore.create({
				client,
				collectionName: 'rocketchat_oauth_sessions',
				ttl: 5 * 60,
				autoRemove: 'native',
			}),
			cookie: {
				httpOnly: true,
				secure: process.env.NODE_ENV === 'production',
				maxAge: 5 * 60 * 1000, // 5 minutes
				sameSite: process.env.NODE_ENV === 'production' ? 'none' : 'lax',
			},
		}),
	);

	oAuthApp.use(oAuthPaths, passport.initialize());
	oAuthApp.use(oAuthPaths, passport.session());
	oAuthApp.use(oAuthPaths, bodyParser.urlencoded({ extended: true }));

	const createOAuthRateLimiter = () =>
		rateLimit({
			windowMs: settings.get<number>('API_Enable_Rate_Limiter_Limit_Time_Default'),
			max: settings.get<number>('API_Enable_Rate_Limiter_Limit_Calls_Default'),
			skip: () =>
				process.env.TEST_MODE === 'true' ||
				process.env.TEST_MODE === 'api' ||
				settings.get<boolean>('API_Enable_Rate_Limiter') !== true ||
				(process.env.NODE_ENV === 'development' && settings.get<boolean>('API_Enable_Rate_Limiter_Dev') !== true),
			handler: (_req, res) => {
				res.status(429).json({
					success: false,
					error: 'Too many requests. Please try again later.',
				});
			},
		});

	let oauthRateLimiter = createOAuthRateLimiter();

	settings.watchMultiple(['API_Enable_Rate_Limiter_Limit_Time_Default', 'API_Enable_Rate_Limiter_Limit_Calls_Default'], () => {
		oauthRateLimiter = createOAuthRateLimiter();
	});

	oAuthRouter.use(oAuthPaths, (req, res, next) => oauthRateLimiter(req, res, next));

	// Register OAuth Routes
	oAuthApp.use(oAuthRouter);

	passport.serializeUser((user: any, done) => {
		done(null, user._id);
	});

	passport.deserializeUser(async (id, done) => {
		const user = await Users.findOneById(id as string, { projection: { __rooms: 0 } });
		// we don’t actually use this user later
		done(null, user);
	});

	settings.watchByRegex(/^(Accounts_OAuth_[a-z0-9_]+|API_GitHub_Enterprise_URL)$/i, () => {
		if (!settings.get<boolean>('Accounts_OAuth_Use_Modern_Flow')) {
			return;
		}

		const services = getOAuthServices(settings);
		const oauthServiceConfigs = createOAuthServiceConfig(settings, services);
		configureOAuthServices(oauthServiceConfigs, settings);
	});

	WebApp.rawConnectHandlers.use(oAuthApp);
};