<?php
	class User {
		private static $secret = '';
		private static $tokenLifetime = 0;


		public static function init($config) {
			self::$secret = $config['secret'];
			self::$tokenLifetime = $config['tokenLifetime'];

			if(!Root::installed())
				self::createTables();
		}

		public static function createTables() {
			DB::getQuery('main',
				'CREATE TABLE IF NOT EXISTS `users` (
					`id` INT(11) NOT NULL AUTO_INCREMENT,
					`login` VARCHAR(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
					`password` VARCHAR(64) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
					`info` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
					`reg_dt` INT(11) NOT NULL,
					`online_dt` INT(11) NOT NULL,
					PRIMARY KEY (`id`)
				)
				ENGINE = InnoDB
				CHARSET=utf8
				COLLATE utf8_general_ci'
			);
		}

		public static function create($login, $password) {
			$login = trim($login);
			$password = trim($password);

			if(self::get($login))
				return false;

			$password = password_hash($password, PASSWORD_BCRYPT);
			DB::getQuery('main',
				'INSERT INTO `users` (`login`, `password`, `info`, `reg_dt`, `online_dt`) VALUES (?, ?, "", ?, ?)',
				[$login, $password, time(), time()]
			);

			return true;
		}

		public static function updateInfo($token, $newInfo) {
			$newInfo = trim($newInfo);

			if(!$login = self::checkToken($token))
				return false;

			DB::getQuery('main', 'UPDATE `users` SET `info` = ? WHERE `login` = ?', [$newInfo, $login]);

			return true;
		}

		public static function delete($token) {
			if(!$login = self::checkToken($token))
				return false;

			DB::getQuery('main', 'DELETE FROM `users` WHERE `login` = ?', $login);

			return true;
		}

		public static function auth($login, $password) {
			$login = trim($login);
			$password = trim($password);
			$user = self::get($login);

			if(!password_verify($password, $user->password))
				return false;

			$until = time() + self::$tokenLifetime;
			$hash = hash('sha256', $login.'|'.$password.'|'.$until.'|'.self::$secret);

			self::updateOnline($login);

			return implode('|', rtrim(strtr(base64_encode($login.'|'.$password.'|'.$until.'|'.$hash), '+/', '-_'), '='));
		}

		public static function get($login) {
			return DB::getQuery('main', 'SELECT * FROM `users` WHERE `login` = ?', $login);
		}

		private static function checkToken($token) {
			$data = explode('|', base64_decode(str_pad(strtr($token, '-_', '+/'), strlen($token) % 4, '=', STR_PAD_RIGHT)));
			list($login, $password, $until, $hash) = $data;

			if($until < time())
				return false;
			if($hash != hash('sha256', $login.'|'.$password.'|'.$until.'|'.self::$secret))
				return false;

			$user = DB::getQuery('main', 'SELECT `password` FROM `users` WHERE `login` = ?', $login);
			if($password != $user->password)
				return false;

			self::updateOnline($login);

			return $login;
		}

		private static function updateOnline($login) {
			DB::getQuery('main', 'UPDATE `users` SET `online_dt` = ? WHERE `login` = ?', [time(), $login]);
		}
	}

	User::init($config['user']);