const config = require('../config.js')
const db = require('knex')(config.database)
const bcrypt = require('bcrypt')
const saltRounds = 10
const randomstring = require('randomstring')

let authController = {}

authController.verify = function(req, res, next) {

	let username = req.body.username
	let password = req.body.password

	if (username === undefined) return res.json({ success: false, description: 'No username provided' })
	if (password === undefined) return res.json({ success: false, description: 'No password provided' })

	db.table('users').where('username', username).then((user) => {
		if (user.length === 0) return res.json({ success: false, description: 'Username doesn\'t exist' })

		bcrypt.compare(password, user[0].password, function(err, result) {
			if (result === false) return res.json({ success: false, description: 'Wrong password' })
			return res.json({ success: true, token: user[0].token })
		})
	}).catch(function(error) { console.log(error); res.json({ success: false, description: 'error' }) })

}

authController.register = function(req, res, next) {

	if (config.enableUserAccounts === false) 
		return res.json({ success: false, description: 'Register is disabled at the moment' })

	let username = req.body.username
	let password = req.body.password

	if (username === undefined) return res.json({ success: false, description: 'No username provided' })
	if (password === undefined) return res.json({ success: false, description: 'No password provided' })

	if (username.length < 4 || username.length > 32)
		return res.json({ success: false, description: 'Username must have 4-32 characters' })
	if (password.length < 6 || password.length > 64)
		return res.json({ success: false, description: 'Password must have 6-64 characters' })

	db.table('users').where('username', username).then((user) => {
		if (user.length !== 0) return res.json({ success: false, description: 'Username already exists' })

		bcrypt.hash(password, saltRounds, function(err, hash) {
			if (err) return res.json({ success: false, description: 'Error generating password hash (╯°□°）╯︵ ┻━┻' })

			let token = randomstring.generate(64)

			db.table('users').insert({
				username: username,
				password: hash,
				token: token
			}).then(() => {
				return res.json({ success: true, token: token })
			}).catch(function(error) { console.log(error); res.json({ success: false, description: 'error' }) })
		})

	}).catch(function(error) { console.log(error); res.json({ success: false, description: 'error' }) })

}

authController.changePassword = function(req, res, next) {

	let token = req.headers.token
	if (token === undefined) return res.status(401).json({ success: false, description: 'No token provided' })

	db.table('users').where('token', token).then((user) => {
		if (user.length === 0) return res.status(401).json({ success: false, description: 'Invalid token'})

		let password = req.body.password
		if (password === undefined) return res.json({ success: false, description: 'No password provided' })
		if (password.length < 6 || password.length > 64)
			return res.json({ success: false, description: 'Password must have 6-64 characters' })

		bcrypt.hash(password, saltRounds, function(err, hash) {
			if (err) return res.json({ success: false, description: 'Error generating password hash (╯°□°）╯︵ ┻━┻' })

			db.table('users').where('id', user[0].id).update({ password: hash }).then(() => {
				return res.json({ success: true })
			}).catch(function(error) { console.log(error); res.json({ success: false, description: 'error' }) })
		})
	}).catch(function(error) { console.log(error); res.json({ success: false, description: 'error' }) })
}

module.exports = authController
