const express = require('express');
const router = express.Router();
const jwt = require('jsonwebtoken');
const User = require('../models/user');

const makeError = error => ({ success: false, error });

router.post('/signup', async (req, res) => {
	const { email, password } = req.body;
	if(email && password) {
		try {
			let collection = req.db.collection('users');
			let users = await collection.find({ email }).toArray();
			if(users.length == 0) {
				let user = new User(email, password);
				await collection.insertOne(user.toDB());
				user.token = jwt.sign({ email }, '#IWantToBelieve', { expiresIn: '365d' });
				res.send({ success: true, data: user });
			} else {
				res.send(makeError('User already exists'));
			}
		} catch(ex) {
			res.send(makeError('Error creating user'));
			console.error(ex);
		}
	} else {
		res.send(makeError('Invalid parameters'));
	}
});

router.post('/login', async (req, res) => {
	const { email, password } = req.body;
	if(email && password) {
		try {
			let users = req.db.collection('users');
			let me = await users.findOne({ email });
			if(me) {
				me = User.fromDB(me);
				if(!me.checkPassword(password)) {
					res.send(makeError('Incorrect email or password'));
					return;
				}

				me.token = jwt.sign({ email }, '#IWantToBelieve', { expiresIn: '365d' });
				res.send({ success: true, data: me });
			} else {
				res.send(makeError('Incorrect login or password'));
			}
		} catch(ex) {
			res.send(makeError('Error logging in'));
			console.error(ex);
		}
	} else {
		res.send(makeError('Invalid parameters'));
	}
});

router.post('/signIn', async (req, res) => {
	const { email, password } = req.body;
	if(email && password) {
		try {
			let users = req.db.collection('users');
			let me = await users.findOne({ email });
			if(me) {
				me = User.fromDB(me);
				if(!me.checkPassword(password)) {
					res.send(makeError('Incorrect email or password'));
					return;
				}

				me.token = jwt.sign({ email }, '#IWantToBelieve', { expiresIn: '365d' });
				res.send({ success: true, data: me });
			} else {
				let user = new User(email, password);
				await users.insertOne(user.toDB());
				user.token = jwt.sign({ email }, '#IWantToBelieve', { expiresIn: '365d' });
				res.send({ success: true, data: user });
			}
		} catch(ex) {
			res.send(makeError('Error logging in'));
			console.error(ex);
		}
	} else {
		res.send(makeError('Invalid parameters'));
	}
});

router.get('/', async (req, res) => {
	const { email } = req.query;
	let users = await req.db.collection('users').find({ email }).toArray();
	if(users.length > 0) {
		res.send({ success: true, data: User.fromDB(users[0]) });
	} else {
		res.status(204).send(makeError('There is no such user'));
	}
});

router.get('/find', async (req, res) => {
	const { email } = req.query;
	let users = await req.db.collection('users').find({ login: { $regex: new RegExp(`.*${email}.*`, 'i') } }).toArray();
	users = users.map(user => {
		user.contacts = [];
		return User.fromDB(user);
	});

	let code = users.length > 0 ? 200 : 204;
	res.status(code).send({ success: true, data: { users } });
});

module.exports = router;