<?php
namespace nntmux;

use App\Models\Settings;
use nntmux\db\DB;
use nntmux\utility\Utility;
use App\Models\User;

class Users
{
	const ERR_SIGNUP_BADUNAME = -1;
	const ERR_SIGNUP_BADPASS = -2;
	const ERR_SIGNUP_BADEMAIL = -3;
	const ERR_SIGNUP_UNAMEINUSE = -4;
	const ERR_SIGNUP_EMAILINUSE = -5;
	const ERR_SIGNUP_BADINVITECODE = -6;
	const ERR_SIGNUP_BADCAPTCHA = -7;
	const SUCCESS = 1;

	const ROLE_GUEST = 0;
	const ROLE_USER = 1;
	const ROLE_ADMIN = 2;
	const ROLE_DISABLED = 3;
	const ROLE_MODERATOR = 4;

	const DEFAULT_INVITES = 1;
	const DEFAULT_INVITE_EXPIRY_DAYS = 7;

	const SALTLEN = 4;
	const SHA1LEN = 40;

	/**
	 * @var int
	 */
	public $password_hash_cost;

	/**
	 * Users SELECT queue type.
	 */
	const QUEUE_NONE = 0;
	const QUEUE_SABNZBD = 1;
	const QUEUE_NZBGET = 2;

	/**
	 * @var DB
	 */
	private $pdo;

	/**
	 * @param array $options Class instances.
	 */
	public function __construct(array $options = [])
	{
		$defaults = [
			'Settings' => null,
		];
		$options += $defaults;

		$this->pdo = $options['Settings'] instanceof DB ? $options['Settings'] : new DB();

		$this->password_hash_cost = defined('NN_PASSWORD_HASH_COST') ? NN_PASSWORD_HASH_COST : 11;
	}

	/**
	 * Verify a password against a hash.
	 *
	 * Automatically update the hash if it needs to be.
	 *
	 * @param string $password Password to check against hash.
	 * @param string|bool $hash     Hash to check against password.
	 * @param int    $userID   ID of the user.
	 *
	 * @return bool
	 */
	public function checkPassword($password, $hash, $userID = -1): bool
	{
		if (password_verify($password, $hash) === false) {
			return false;
		}

		// Update the hash if it needs to be.
		if (is_numeric($userID) && $userID > 0 && password_needs_rehash($hash, PASSWORD_DEFAULT, ['cost' => $this->password_hash_cost])) {
			$hash = $this->hashPassword($password);

			if ($hash !== false) {
				User::query()->where('id', $userID)->update(['password' => $hash]);
			}
		}
		return true;
	}


	/**
	 * @return array
	 */
	public function get(): array
	{
		return User::all()->all();
	}

	/**
	 * Get the users selected theme.
	 *
	 * @param string|int $userID The id of the user.
	 *
	 * @return array|bool The users selected theme.
	 */
	public function getStyle($userID)
	{
		$row = User::query()->where('id', $userID)->value('style');
		return $row ?? 'None';
	}

	/**
	 * @param $id
	 */
	public function delete($id): void
	{
		$this->delCartForUser($id);
		$this->delUserCategoryExclusions($id);
		$this->delDownloadRequests($id);
		$this->delApiRequests($id);

		$rc = new ReleaseComments();
		$rc->deleteCommentsForUser($id);

		$um = new UserMovies();
		$um->delMovieForUser($id);

		$us = new UserSeries();
		$us->delShowForUser($id);

		$forum = new Forum();
		$forum->deleteUser($id);

		User::query()->where('id', $id)->delete();
	}

	/**
	 * @param $uid
	 */
	public function delCartForUser($uid): void
	{
		$this->pdo->queryExec(sprintf('DELETE FROM users_releases WHERE users_id = %d', $uid));
	}

	/**
	 * @param $uid
	 */
	public function delUserCategoryExclusions($uid): void
	{
		$this->pdo->queryExec(sprintf('DELETE FROM user_excluded_categories WHERE users_id = %d', $uid));
	}

	/**
	 * @param $userID
	 */
	public function delDownloadRequests($userID): void
	{
		$this->pdo->queryExec(sprintf('DELETE FROM user_downloads WHERE users_id = %d', $userID));
	}

	/**
	 * @param $userID
	 */
	public function delApiRequests($userID): void
	{
		$this->pdo->queryExec(sprintf('DELETE FROM user_requests WHERE users_id = %d', $userID));
	}

	/**
	 * Get all users / extra data from other tables.
	 *
	 * @param        $start
	 * @param        $offset
	 * @param        $orderBy
	 * @param string $userName
	 * @param string $email
	 * @param string $host
	 * @param string $role
	 * @param bool   $apiRequests
	 *
	 * @return array
	 */
	public function getRange($start, $offset, $orderBy, $userName = '', $email = '', $host = '', $role = '', $apiRequests = false): array
	{
		if ($apiRequests) {
			$this->clearApiRequests(false);
			$query = "
				SELECT users.*, user_roles.name AS rolename, COUNT(user_requests.id) AS apirequests
				FROM users
				INNER JOIN user_roles ON user_roles.id = users.role
				LEFT JOIN user_requests ON user_requests.users_id = users.id
				WHERE users.id != 0 %s %s %s %s
				AND email != 'sharing@nZEDb.com'
				GROUP BY users.id
				ORDER BY %s %s %s"
			;
		} else {
			$query = '
				SELECT users.*, user_roles.name AS rolename
				FROM users
				INNER JOIN user_roles ON user_roles.id = users.role
				WHERE 1=1 %s %s %s %s
				ORDER BY %s %s %s'
			;
		}

		$order = $this->getBrowseOrder($orderBy);

		return $this->pdo->query(
			sprintf(
				$query,
				($userName !== '' ? ('AND users.username ' . $this->pdo->likeString($userName)) : ''),
				($email !== '' ? ('AND users.email ' . $this->pdo->likeString($email)) : ''),
				($host !== '' ? ('AND users.host ' . $this->pdo->likeString($host)) : ''),
				($role !== '' ? ('AND users.role = ' . $role) : ''),
				$order[0],
				$order[1],
				($start === false ? '' : ('LIMIT ' . $offset . ' OFFSET ' . $start))
			)
		);
	}

	/**
	 * @param string $orderBy
	 *
	 * @return array
	 */
	public function getBrowseOrder($orderBy): array
	{
		$order = ($orderBy === '' ? 'username_desc' : $orderBy);
		$orderArr = explode('_', $order);
		switch ($orderArr[0]) {
			case 'username':
				$orderField = 'username';
				break;
			case 'email':
				$orderField = 'email';
				break;
			case 'host':
				$orderField = 'host';
				break;
			case 'createddate':
				$orderField = 'createddate';
				break;
			case 'lastlogin':
				$orderField = 'lastlogin';
				break;
			case 'apiaccess':
				$orderField = 'apiaccess';
				break;
			case 'apirequests':
				$orderField = 'apirequests';
				break;
			case 'grabs':
				$orderField = 'grabs';
				break;
			case 'role':
				$orderField = 'role';
				break;
			case 'rolechangedate':
				$orderField = 'rolechangedate';
				break;
			default:
				$orderField = 'username';
				break;
		}
		$orderSort = (isset($orderArr[1]) && preg_match('/^asc|desc$/i', $orderArr[1])) ? $orderArr[1] : 'desc';
		return [$orderField, $orderSort];
	}

	/**
	 * @param string|int $role
	 *
	 * @return mixed
	 */
	public function getCount($role = '')
	{
		$res = $this->pdo->queryOneRow(sprintf("SELECT COUNT(id) as num FROM users WHERE email != 'sharing@nZEDb.com' %s", $role !== '' ? sprintf('AND role = %d', $role) : ''));

		return $res['num'];
	}

	/**
	 * @param        $id
	 * @param        $userName
	 * @param        $email
	 * @param        $grabs
	 * @param        $role
	 * @param        $notes
	 * @param        $invites
	 * @param        $movieview
	 * @param        $musicview
	 * @param        $gameview
	 * @param        $xxxview
	 * @param        $consoleview
	 * @param        $bookview
	 * @param string $queueType
	 * @param string $nzbgetURL
	 * @param string $nzbgetUsername
	 * @param string $nzbgetPassword
	 * @param string $saburl
	 * @param string $sabapikey
	 * @param string $sabpriority
	 * @param string $sabapikeytype
	 * @param bool   $nzbvortexServerUrl
	 * @param bool   $nzbvortexApiKey
	 * @param bool   $cp_url
	 * @param bool   $cp_api
	 * @param string $style
	 *
	 * @return int
	 * @throws \Illuminate\Database\Eloquent\ModelNotFoundException
	 */
	public function update($id, $userName, $email, $grabs, $role, $notes, $invites, $movieview, $musicview, $gameview, $xxxview, $consoleview, $bookview, $queueType = '', $nzbgetURL = '', $nzbgetUsername = '', $nzbgetPassword = '', $saburl = '', $sabapikey = '', $sabpriority = '', $sabapikeytype = '', $nzbvortexServerUrl = false, $nzbvortexApiKey = false, $cp_url = false, $cp_api = false, $style = 'None'): int
	{
		$userName = trim($userName);
		$email = trim($email);

		if (!$this->isValidUsername($userName)) {
			return self::ERR_SIGNUP_BADUNAME;
		}

		if (!$this->isValidEmail($email)) {
			return self::ERR_SIGNUP_BADEMAIL;
		}

		$res = $this->getByUsername($userName);
		if ($res) {
			if ((int)$res['id'] !== (int)$id) {
				return self::ERR_SIGNUP_UNAMEINUSE;
			}
		}

		$res = $this->getByEmail($email);
		if ($res) {
			if ((int)$res['id'] !== (int)$id) {
				return self::ERR_SIGNUP_EMAILINUSE;
			}
		}

		$sql = [];

		$sql[] = sprintf('username = %s', $this->pdo->escapeString($userName));
		$sql[] = sprintf('email = %s', $this->pdo->escapeString($email));
		$sql[] = sprintf('grabs = %d', $grabs);
		$sql[] = sprintf('role = %d', $role);
		$sql[] = sprintf('notes = %s', $this->pdo->escapeString(substr($notes, 0, 255)));
		$sql[] = sprintf('invites = %d', $invites);
		$sql[] = sprintf('movieview = %d', $movieview);
		$sql[] = sprintf('musicview = %d', $musicview);
		$sql[] = sprintf('gameview = %d', $gameview);
		$sql[] = sprintf('xxxview = %d', $xxxview);
		$sql[] = sprintf('consoleview = %d', $consoleview);
		$sql[] = sprintf('bookview = %d', $bookview);
		$sql[] = sprintf('style = %s', $this->pdo->escapeString($style));

		if ($queueType !== '') {
			$sql[] = sprintf('queuetype = %d', $queueType);
		}

		if ($nzbgetURL !== '') {
			$sql[] = sprintf('nzbgeturl = %s', $this->pdo->escapeString($nzbgetURL));
		}

		$sql[] = sprintf('nzbgetusername = %s', $this->pdo->escapeString($nzbgetUsername));
		$sql[] = sprintf('nzbgetpassword = %s', $this->pdo->escapeString($nzbgetPassword));

		if ($saburl !== '') {
			$sql[] = sprintf('saburl = %s', $this->pdo->escapeString($saburl));
		}
		if ($sabapikey !== '') {
			$sql[] = sprintf('sabapikey = %s', $this->pdo->escapeString($sabapikey));
		}
		if ($sabpriority !== '') {
			$sql[] = sprintf('sabpriority = %d', $sabpriority);
		}
		if ($sabapikeytype !== '') {
			$sql[] = sprintf('sabapikeytype = %d', $sabapikeytype);
		}
		if ($nzbvortexServerUrl !== false) {
			$sql[] = sprintf("nzbvortex_server_url = '%s'", $nzbvortexServerUrl);
		}
		if ($nzbvortexApiKey !== false) {
			$sql[] = sprintf("nzbvortex_api_key = '%s'", $nzbvortexApiKey);
		}
		if ($cp_url !== false) {
			$sql[] = sprintf('cp_url = %s', $this->pdo->escapeString($cp_url));
		}
		if ($cp_api !== false) {
			$sql[] = sprintf('cp_api = %s', $this->pdo->escapeString($cp_api));
		}

		$this->pdo->queryExec(sprintf('UPDATE users SET %s WHERE id = %d', implode(', ', $sql), $id));

		return self::SUCCESS;
	}

	/**
	 * @param string $userName
	 *
	 * @return int
	 */
	public function isValidUsername(string $userName): int
	{
		return preg_match('/^[a-z][a-z0-9_]{2,}$/i', $userName);
	}

	/**
	 * When a user is registering or updating their profile, check if the email is valid.
	 *
	 * @param string $email
	 *
	 * @return bool
	 */
	public function isValidEmail(string $email): bool
	{
		return (bool)preg_match('/^([\w\+-]+)(\.[\w\+-]+)*@([a-z0-9-]+\.)+[a-z]{2,6}$/i', $email);
	}

	/**
	 * @param string $userName
	 *
	 * @return array|bool
	 */
	public function getByUsername(string $userName)
	{
		return $this->pdo->queryOneRow(sprintf('SELECT users.*, user_roles.name as rolename, user_roles.apirequests, user_roles.downloadrequests FROM users INNER JOIN user_roles on user_roles.id = users.role WHERE username = %s', $this->pdo->escapeString($userName)));
	}

	/**
	 * @param string $email
	 *
	 * @return \Illuminate\Database\Eloquent\Model|static
	 * @throws \Illuminate\Database\Eloquent\ModelNotFoundException
	 */
	public function getByEmail(string $email)
	{
		return User::query()->where('email', '=', $email)->first();
	}

	/**
	 * @param int $uid
	 * @param int $role
	 *
	 * @return int
	 */
	public function updateUserRole(int $uid, int $role): int
	{
		User::query()->where('id', $uid)->update(['role' => $role]);

		return self::SUCCESS;
	}

	/**
	 * @param $uid
	 * @param $date
	 *
	 * @return int
	 */
	public function updateUserRoleChangeDate($uid, $date): int
	{
		User::query()->where('id', $uid)->update(['rolechangedate' => $date]);

		return self::SUCCESS;
	}

	/**
	 * @param $msgsubject
	 * @param $msgbody
	 *
	 * @return int
	 * @throws \Exception
	 */
	public function updateExpiredRoles($msgsubject, $msgbody): int
	{
		$data = User::query()->whereDate('rolechangedate', '<', (new \DateTime())->format('Y-m-d H:i:s'))->select(['id', 'email'])->get();

		foreach ($data as $u) {
			Utility::sendEmail($u['email'], $msgsubject, $msgbody, Settings::value('site.main.email'));
			User::query()->where('id', $u['id'])->update(['role' => self::ROLE_USER, 'rolechangedate' => null]);
		}

		return self::SUCCESS;
	}

	/**
	 * @param $uid
	 *
	 * @return int
	 */
	public function updateRssKey($uid): int
	{
		User::query()->where('id', $uid)->update(['rsstoken' => md5(uniqid('', true))]);

		return self::SUCCESS;
	}

	/**
	 * @param $id
	 * @param $guid
	 *
	 * @return int
	 */
	public function updatePassResetGuid($id, $guid): int
	{
		User::query()->where('id', $id)->update(['resetguid' => $guid]);

		return self::SUCCESS;
	}

	/**
	 * @param int    $id
	 * @param string $password
	 *
	 * @return int
	 */
	public function updatePassword(int $id, string $password): int
	{
		User::query()->where('id', $id)->update(['password' => $this->hashPassword($password), 'userseed' => md5(Utility::generateUuid())]);

		return self::SUCCESS;
	}

	/**
	 * Hash a password using crypt.
	 *
	 * @param string $password
	 *
	 * @return string|bool
	 */
	public function hashPassword($password)
	{
		return password_hash($password, PASSWORD_DEFAULT, ['cost' => $this->password_hash_cost]);
	}

	/**
	 * @param string $string
	 *
	 * @return string
	 */
	public static function hashSHA1(string $string): string
	{
		return sha1($string);
	}

	/**
	 * @param $guid
	 *
	 * @return \Illuminate\Database\Eloquent\Model|static
	 * @throws \Illuminate\Database\Eloquent\ModelNotFoundException
	 */
	public function getByPassResetGuid(string $guid)
	{
		return User::query()->where('resetguid', $guid)->first();
	}

	/**
	 * @param     $id
	 * @param int $num
	 */
	public function incrementGrabs(int $id, $num = 1): void
	{
		User::query()->where('id', $id)->increment('grabs', $num);
	}

	/**
	 * Check if the user is in the database, and if their API key is good, return user data if so.
	 *
	 * @param int    $userID   ID of the user.
	 * @param string $rssToken API key.
	 *
	 * @return bool|array
	 */
	public function getByIdAndRssToken($userID, $rssToken)
	{
		$user = $this->getById($userID);
		if ($user === false) {
			return false;
		}

		return ($user['rsstoken'] !== $rssToken ? false : $user);
	}

	/**
	 * @param $id
	 *
	 * @return array|bool
	 */
	public function getById($id)
	{

		$sql = sprintf('SELECT users.*, user_roles.name as rolename, user_roles.hideads, user_roles.canpreview, user_roles.apirequests, user_roles.downloadrequests, NOW() as now FROM users INNER JOIN user_roles on user_roles.id = users.role WHERE users.id = %d', $id);

		return $this->pdo->queryOneRow($sql);
	}

	/**
	 * @param string $rssToken
	 *
	 * @return array|bool
	 */
	public function getByRssToken(string $rssToken)
	{
		return $this->pdo->queryOneRow(sprintf('SELECT users.*, user_roles.apirequests, user_roles.downloadrequests, NOW() as now FROM users INNER JOIN user_roles on user_roles.id = users.role WHERE users.rsstoken = %s', $this->pdo->escapeString($rssToken)));
	}

	/**
	 * @return array
	 */
	public function getBrowseOrdering(): array
	{
		return ['username_asc', 'username_desc', 'email_asc', 'email_desc', 'host_asc', 'host_desc', 'createddate_asc', 'createddate_desc', 'lastlogin_asc', 'lastlogin_desc', 'apiaccess_asc', 'apiaccess_desc', 'apirequests_asc', 'apirequests_desc', 'grabs_asc', 'grabs_desc', 'role_asc', 'role_desc', 'rolechangedate_asc', 'rolechangedate_desc'];
	}

	/**
	 * @param $username
	 *
	 * @return bool
	 */
	public function isDisabled($username): bool
	{
		return $this->roleCheck(self::ROLE_DISABLED, $username);
	}

	/**
	 * @param $url
	 *
	 * @return bool
	 */
	public function isValidUrl($url): bool
	{
		return (!preg_match('/^(http|https|ftp):\/\/([A-Z0-9][A-Z0-9_-]*(?:\.[A-Z0-9][A-Z0-9_-]*)+):?(\d+)?\/?/i', $url)) ? false : true;
	}

	/**
	 * Create a random username.
	 *
	 * @param string $email
	 *
	 * @return string
	 */
	public function generateUsername($email): string
	{
		$string = '';
		if (preg_match('/[A-Za-z0-9]+/', $email, $matches)) {
			$string = $matches[0];
		}

		return 'u' . substr(md5(uniqid('', true)), 0, 7) . $string;
	}

	/**
	 * @return string
	 */
	public function generatePassword(): string
	{
		return substr(md5(uniqid('', true)), 0, 8);
	}

	/**
	 * Register a new user.
	 *
	 * @param        $userName
	 * @param        $password
	 * @param        $email
	 * @param        $host
	 * @param int    $role
	 * @param        $notes
	 * @param int    $invites
	 * @param string $inviteCode
	 * @param bool   $forceInviteMode
	 *
	 * @return bool|int
	 * @throws \Exception
	 * @throws \Illuminate\Database\Eloquent\ModelNotFoundException
	 */
	public function signup($userName, $password, $email, $host, $role = self::ROLE_USER, $notes, $invites = self::DEFAULT_INVITES, $inviteCode = '', $forceInviteMode = false)
	{

		$userName = trim($userName);
		$password = trim($password);
		$email = trim($email);

		if (!$this->isValidUsername($userName)) {
			return self::ERR_SIGNUP_BADUNAME;
		}

		if (!$this->isValidPassword($password)) {
			return self::ERR_SIGNUP_BADPASS;
		}

		if (!$this->isValidEmail($email)) {
			return self::ERR_SIGNUP_BADEMAIL;
		}

		$res = $this->getByUsername($userName);
		if ($res) {
			return self::ERR_SIGNUP_UNAMEINUSE;
		}

		$res = $this->getByEmail($email);
		if ($res) {
			return self::ERR_SIGNUP_EMAILINUSE;
		}

		// Make sure this is the last check, as if a further validation check failed, the invite would still have been used up.
		$invitedBy = 0;
		if (!$forceInviteMode && (int)Settings::value('..registerstatus') === Settings::REGISTER_STATUS_INVITE) {
			if ($inviteCode === '') {
				return self::ERR_SIGNUP_BADINVITECODE;
			}

			$invitedBy = $this->checkAndUseInvite($inviteCode);
			if ($invitedBy < 0) {
				return self::ERR_SIGNUP_BADINVITECODE;
			}
		}

		return $this->add($userName, $password, $email, $role, $notes, $host, $invites, $invitedBy);
	}

	/**
	 * @param $password
	 *
	 * @return bool
	 */
	public function isValidPassword(string $password): bool
	{
		return (strlen($password) > 5);
	}

	/**
	 * If a invite is used, decrement the person who invited's invite count.
	 *
	 * @param int $inviteCode
	 *
	 * @return int
	 */
	public function checkAndUseInvite($inviteCode): int
	{
		$invite = $this->getInvite($inviteCode);
		if (!$invite) {
			return -1;
		}

		User::query()->where('id', $invite['users_id'])->decrement('invites');
		$this->deleteInvite($inviteCode);
		return $invite['users_id'];
	}

	/**
	 * @param $inviteToken
	 *
	 * @return array|bool
	 */
	public function getInvite($inviteToken)
	{
		//
		// Tidy any old invites sent greater than DEFAULT_INVITE_EXPIRY_DAYS days ago.
		//
		$this->pdo->queryExec(sprintf('DELETE FROM invitations WHERE createddate < now() - INTERVAL %d DAY', self::DEFAULT_INVITE_EXPIRY_DAYS));

		return $this->pdo->queryOneRow(
			sprintf(
				'SELECT * FROM invitations WHERE guid = %s',
				$this->pdo->escapeString($inviteToken)
			)
		);
	}

	/**
	 * @param $inviteToken
	 */
	public function deleteInvite(string $inviteToken): void
	{

		$this->pdo->queryExec(sprintf('DELETE FROM invitations WHERE guid = %s', $this->pdo->escapeString($inviteToken)));
	}


	/**
	 * Add a new user.
	 *
	 * @param string      $userName
	 * @param string|bool $password
	 * @param string      $email
	 * @param integer     $role
	 * @param             $notes
	 * @param             $host
	 * @param integer     $invites
	 * @param integer     $invitedBy
	 *
	 * @return bool|int
	 * @throws \Exception
	 */
	public function add($userName, $password, $email, $role, $notes, $host, $invites = self::DEFAULT_INVITES, $invitedBy = 0)
	{

		$password = $this->hashPassword($password);
		if (!$password) {
			return false;
		}
		return $this->pdo->queryInsert(
			sprintf('
				INSERT INTO users (username, password, email, role, createddate, host, rsstoken,
					invites, invitedby, userseed, notes)
				VALUES (%s, %s, LOWER(%s), %d, NOW(), %s, MD5(%s), %d, %s, MD5(%s), %s)',
				$this->pdo->escapeString($userName),
				$this->pdo->escapeString((string)$password),
				$this->pdo->escapeString($email),
				$role,
				$this->pdo->escapeString((int)Settings::value('..storeuserips') === 1 ? $host : ''),
				$this->pdo->escapeString(uniqid('', true)),
				$invites,
				((int)$invitedBy === 0 ? 'NULL' : $invitedBy),
				$this->pdo->escapeString($this->pdo->uuid()),
				$this->pdo->escapeString($notes)
			)
		);
	}

	/**
	 * Verify if the user is logged in.
	 *
	 * @return bool
	 * @throws \Exception
	 */
	public function isLoggedIn(): bool
	{
		if (isset($_SESSION['uid'])) {
			return true;
		}
		if (isset($_COOKIE['uid'], $_COOKIE['idh'])) {
			$u = $this->getById($_COOKIE['uid']);

			if ((int)$u['role'] !== self::ROLE_DISABLED && $_COOKIE['idh'] === self::hashSHA1($u['userseed'] . $_COOKIE['uid'])) {
				$this->login($_COOKIE['uid'], $_SERVER['REMOTE_ADDR']);
			}
		}
		return isset($_SESSION['uid']);
	}

	/**
	 * Log in a user.
	 *
	 * @param int    $userID   ID of the user.
	 * @param string $host
	 * @param string $remember Save the user in cookies to keep them logged in.
	 *
	 * @throws \Exception
	 */
	public function login($userID, $host = '', $remember = ''): void
	{
		$_SESSION['uid'] = $userID;

		if ((int)Settings::value('..storeuserips') !== 1) {
			$host = '';
		}

		$this->updateSiteAccessed($userID, $host);

		if ((int)$remember === 1) {
			$this->setCookies($userID);
		}
	}

	/**
	 * When a user logs in, update the last time they logged in.
	 *
	 * @param int    $userID ID of the user.
	 * @param string $host
	 */
	public function updateSiteAccessed($userID, $host = ''): void
	{
		$this->pdo->queryExec(
			sprintf(
				'UPDATE users SET lastlogin = NOW() %s WHERE id = %d',
				($host === '' ? '' : (', host = ' . $this->pdo->escapeString($host))),
				$userID
			)
		);
	}

	/**
	 * Set up cookies for a user.
	 *
	 * @param int $userID
	 */
	public function setCookies($userID): void
	{
		$user = $this->getById($userID);
		$secure_cookie = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? '1' : '0');
		setcookie('uid', $userID, time() + 2592000, '/', null, $secure_cookie, true);
		setcookie('idh', self::hashSHA1($user['userseed'] . $userID), time() + 2592000, '/', null, $secure_cookie, true);	}

	/**
	 * Return the User ID of the user.
	 *
	 * @return int
	 */
	public function currentUserId(): int
	{
		return $_SESSION['uid'] ?? -1;
	}

	/**
	 * Logout the user, destroying his cookies and session.
	 */
	public function logout(): void
	{
		session_unset();
		session_destroy();
		$secure_cookie = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? '1' : '0');
		setcookie('uid', null, -1, '/', null, $secure_cookie, true);
		setcookie('idh', null, -1, '/', null, $secure_cookie, true);
	}

	/**
	 * @param $uid
	 */
	public function updateApiAccessed($uid): void
	{

		User::query()->where('id', $uid)->update(['apiaccess' => date('Y-m-d h:m:s')]);
	}

	/**
	 * @param $uid
	 * @param $releaseid
	 *
	 * @return false|int|string
	 */
	public function addCart($uid, $releaseid)
	{

		$sql = sprintf('INSERT INTO users_releases (users_id, releases_id, createddate) VALUES (%d, %d, now())', $uid, $releaseid);

		return $this->pdo->queryInsert($sql);
	}

	/**
	 * @param        $uid
	 * @param int|string $releaseId
	 *
	 * @return array
	 */
	public function getCart($uid, $releaseId = ''): array
	{

		if ($releaseId !== '') {
			$releaseId = ' AND releases.id = ' . $releaseId;
		}

		return $this->pdo->query(sprintf('SELECT users_releases.*, releases.searchname,releases.guid FROM users_releases INNER JOIN releases on releases.id = users_releases.releases_id WHERE users_id = %d %s', $uid, $releaseId));
	}

	/**
	 * @param array $guids
	 * @param $userID
	 *
	 * @return bool
	 */
	public function delCartByGuid($guids, $userID): bool
	{
		if (!is_array($guids)) {
			return false;
		}

		$del = [];
		foreach ($guids as $guid) {
			$rel = $this->pdo->queryOneRow(sprintf('SELECT id FROM releases WHERE guid = %s', $this->pdo->escapeString($guid)));
			if ($rel) {
				$del[] = $rel['id'];
			}
		}

		return (bool)$this->pdo->queryExec(
			sprintf(
				'DELETE FROM users_releases WHERE releases_id IN (%s) AND users_id = %d', implode(',', $del), $userID
			)
		);
	}

	/**
	 * @param $guid
	 * @param $uid
	 */
	public function delCartByUserAndRelease($guid, $uid): void
	{
		$rel = $this->pdo->queryOneRow(sprintf('SELECT id FROM releases WHERE guid = %s', $this->pdo->escapeString($guid)));
		if ($rel) {
			$this->pdo->queryExec(sprintf('DELETE FROM users_releases WHERE users_id = %d AND releases_id = %d', $uid, $rel['id']));
		}
	}

	/**
	 * @param $rid
	 */
	public function delCartForRelease($rid): void
	{
		$this->pdo->queryExec(sprintf('DELETE FROM users_releases WHERE releases_id = %d', $rid));
	}


	/**
	 * @param       $uid
	 * @param array $catids
	 */
	public function addCategoryExclusions($uid, array $catids): void
	{
		$this->delUserCategoryExclusions($uid);
		if (count($catids) > 0) {
			foreach ($catids as $catid) {
				$this->pdo->queryInsert(sprintf('INSERT INTO user_excluded_categories (users_id, categories_id, createddate) VALUES (%d, %d, now())', $uid, $catid));
			}
		}
	}

	/**
	 * @param $role
	 *
	 * @return array
	 */
	public function getRoleCategoryExclusion($role): array
	{
		$ret = [];
		$categories = $this->pdo->query(sprintf('SELECT categories_id FROM role_excluded_categories WHERE role = %d', $role));
		foreach ($categories as $category) {
			$ret[] = $category['categories_id'];
		}

		return $ret;
	}

	/**
	 * @param $role
	 * @param $catids
	 */
	public function addRoleCategoryExclusions($role, array $catids): void
	{
		$this->delRoleCategoryExclusions($role);
		if (count($catids) > 0) {
			foreach ($catids as $catid) {
				$this->pdo->queryInsert(sprintf('INSERT INTO role_excluded_categories (role, categories_id, createddate) VALUES (%d, %d, now())', $role, $catid));
			}
		}
	}

	/**
	 * @param $role
	 */
	public function delRoleCategoryExclusions($role): void
	{
		$this->pdo->queryExec(sprintf('DELETE FROM role_excluded_categories WHERE role = %d', $role));
	}

	/**
	 * Get the list of categories the user has excluded.
	 *
	 * @param int $userID ID of the user.
	 *
	 * @return array
	 */
	public function getCategoryExclusion($userID): array
	{
		$ret = [];
		$categories = $this->pdo->query(sprintf('SELECT categories_id FROM user_excluded_categories WHERE users_id = %d', $userID));
		foreach ($categories as $category) {
			$ret[] = $category['categories_id'];
		}

		return $ret;
	}

	/**
	 * Get list of category names excluded by the user.
	 *
	 * @param int $userID ID of the user.
	 *
	 * @return array
	 */
	public function getCategoryExclusionNames($userID): array
	{
		$data = $this->getCategoryExclusion($userID);
		$category = new Category(['Settings' => $this->pdo]);
		$categories = $category->getByIds($data);
		$ret = [];
		if ($categories !== false) {
			foreach ($categories as $cat) {
				$ret[] = $cat['title'];
			}
		}
		return $ret;
	}

	/**
	 * @param $uid
	 * @param $catid
	 */
	public function delCategoryExclusion($uid, $catid): void
	{
		$this->pdo->queryExec(sprintf('DELETE FROM user_excluded_categories WHERE users_id = %d AND categories_id = %d', $uid, $catid));
	}

	/**
	 * @param $sitetitle
	 * @param $siteemail
	 * @param $serverurl
	 * @param $uid
	 * @param $emailto
	 *
	 * @return string
	 * @throws \Exception
	 */
	public function sendInvite($sitetitle, $siteemail, $serverurl, $uid, $emailto): string
	{
		$sender = $this->getById($uid);
		$token = self::hashSHA1(uniqid('', true));
		$subject = $sitetitle . ' Invitation';
		$url = $serverurl . 'register?invitecode=' . $token;
		$contents = $sender['username'] . ' has sent an invite to join ' . $sitetitle . ' to this email address. To accept the invitation click the following link. ' . $url;

		Utility::sendEmail($emailto, $subject, $contents, $siteemail);
		$this->addInvite($uid, $token);

		return $url;
	}

	/**
	 * @param $uid
	 * @param $inviteToken
	 */
	public function addInvite(int $uid, string $inviteToken): void
	{
		$this->pdo->queryInsert(sprintf('INSERT INTO invitations (guid, users_id, createddate) VALUES (%s, %d, now())', $this->pdo->escapeString($inviteToken), $uid));
	}

	/**
	 * @return array
	 */
	public function getTopGrabbers(): array
	{
		return $this->pdo->query('SELECT id, username, SUM(grabs) as grabs FROM users
							GROUP BY id, username
							HAVING SUM(grabs) > 0
							ORDER BY grabs DESC
							LIMIT 10'
		);
	}

	/**
	 * Get list of user signups by month.
	 *
	 * @return array
	 */
	public function getUsersByMonth(): array
	{
		return $this->pdo->query("
			SELECT DATE_FORMAT(createddate, '%M %Y') AS mth, COUNT(id) AS num
			FROM users
			WHERE createddate IS NOT NULL AND createddate != '0000-00-00 00:00:00'
			GROUP BY mth
			ORDER BY createddate DESC"
		);
	}

	/**
	 * @return array
	 * @throws \Exception
	 */
	public function getUsersByHostHash(): array
	{
		$ipsql = "('-1')";

		if (Settings::value('..userhostexclusion') !== '') {
			$ipsql = '';
			$ips = explode(',', Settings::value('..userhostexclusion'));
			foreach ($ips as $ip) {
				$ipsql .= $this->pdo->escapeString($this->getHostHash($ip, Settings::value('..siteseed'))) . ',';
			}
			$ipsql = "(" . $ipsql . " '-1')";
		}

		$sql = sprintf("SELECT hosthash, group_concat(users_id) AS user_string, group_concat(username) AS user_names
							FROM
							(
							SELECT hosthash, users_id, username FROM user_downloads LEFT OUTER JOIN users ON users.id = user_downloads.users_id WHERE hosthash IS NOT NULL AND hosthash NOT IN %s GROUP BY hosthash, users_id
							union distinct
							SELECT hosthash, users_id, username FROM user_requests LEFT OUTER JOIN users on users.id = user_requests.users_id WHERE hosthash IS NOT NULL AND hosthash NOT IN %s GROUP BY hosthash, users_id
							) x
							GROUP BY hosthash
							HAVING CAST((LENGTH(group_concat(users_id)) - LENGTH(REPLACE(group_concat(users_id), ',', ''))) / LENGTH(',') AS UNSIGNED) < 9
							ORDER BY CAST((LENGTH(group_concat(users_id)) - LENGTH(REPLACE(group_concat(users_id), ',', ''))) / LENGTH(',') AS UNSIGNED) DESC
							limit 10", $ipsql, $ipsql
		);

		return $this->pdo->query($sql);
	}

	/**
	 * @param        $host
	 * @param string|null $siteseed
	 *
	 * @return string
	 * @throws \Exception
	 */
	public function getHostHash($host, string $siteseed = ''): string
	{
		if ($siteseed === '') {
			$siteseed = Settings::value('..siteseed');
		}

		return self::hashSHA1($siteseed . $host . $siteseed);
	}

	/**
	 * @return array
	 */
	public function getUsersByRole(): array
	{
		return $this->pdo->query('SELECT ur.name, COUNT(u.id) as num FROM users u
							INNER JOIN user_roles ur ON ur.id = u.role
							GROUP BY ur.name
							ORDER BY COUNT(u.id) DESC'
		);
	}

	/**
	 * @return array
	 */
	public function getLoginCountsByMonth(): array
	{
		return $this->pdo->query("SELECT 'Login' as type,
			sum(case when lastlogin > curdate() - INTERVAL 1 DAY then 1 else 0 end) as 1day,
			sum(case when lastlogin > curdate() - INTERVAL 7 DAY AND lastlogin < curdate() - INTERVAL 1 DAY then 1 else 0 end) as 7day,
			sum(case when lastlogin > curdate() - INTERVAL 1 MONTH AND lastlogin < curdate() - INTERVAL 7 DAY then 1 else 0 end) as 1month,
			sum(case when lastlogin > curdate() - INTERVAL 3 MONTH AND lastlogin < curdate() - INTERVAL 1 MONTH then 1 else 0 end) as 3month,
			sum(case when lastlogin > curdate() - INTERVAL 6 MONTH AND lastlogin < curdate() - INTERVAL 3 MONTH then 1 else 0 end) as 6month,
			sum(case when lastlogin < curdate() - INTERVAL 6 MONTH then 1 else 0 end) as 12month
			FROM users
			union
			SELECT 'Api' as type,
			sum(case when apiaccess > curdate() - INTERVAL 1 DAY then 1 else 0 end) as 1day,
			sum(case when apiaccess > curdate() - INTERVAL 7 DAY AND apiaccess < curdate() - INTERVAL 1 DAY then 1 else 0 end) as 7day,
			sum(case when apiaccess > curdate() - INTERVAL 1 MONTH AND apiaccess < curdate() - INTERVAL 7 DAY then 1 else 0 end) as 1month,
			sum(case when apiaccess > curdate() - INTERVAL 3 MONTH AND apiaccess < curdate() - INTERVAL 1 MONTH then 1 else 0 end) as 3month,
			sum(case when apiaccess > curdate() - INTERVAL 6 MONTH AND apiaccess < curdate() - INTERVAL 3 MONTH then 1 else 0 end) as 6month,
			sum(case when apiaccess < curdate() - INTERVAL 6 MONTH then 1 else 0 end) as 12month
			FROM users"
		);
	}

	/**
	 * @return array
	 */
	public function getRoles(): array
	{
		return $this->pdo->query('SELECT * FROM user_roles');
	}

	/**
	 * @param $id
	 *
	 * @return array|bool
	 */
	public function getRoleById($id)
	{
		$sql = sprintf('SELECT * FROM user_roles WHERE id = %d', $id);

		return $this->pdo->queryOneRow($sql);
	}

	/**
	 * @param $name
	 * @param $apirequests
	 * @param $downloadrequests
	 * @param $defaultinvites
	 * @param $canpreview
	 * @param $hideads
	 *
	 * @return false|int|string
	 */
	public function addRole($name, $apirequests, $downloadrequests, $defaultinvites, $canpreview, $hideads)
	{
		$sql = sprintf('INSERT INTO user_roles (name, apirequests, downloadrequests, defaultinvites, canpreview, hideads) VALUES (%s, %d, %d, %d, %d, %d)', $this->pdo->escapeString($name), $apirequests, $downloadrequests, $defaultinvites, $canpreview, $hideads);

		return $this->pdo->queryInsert($sql);
	}

	/**
	 * @param $id
	 * @param $name
	 * @param $apirequests
	 * @param $downloadrequests
	 * @param $defaultinvites
	 * @param $isdefault
	 * @param $canpreview
	 * @param $hideads
	 *
	 * @return bool|\PDOStatement
	 */
	public function updateRole($id, $name, $apirequests, $downloadrequests, $defaultinvites, $isdefault, $canpreview, $hideads)
	{
		if ((int)$isdefault === 1) {
			$this->pdo->queryExec('UPDATE user_roles SET isdefault = 0');
		}
		return $this->pdo->queryExec(sprintf('UPDATE user_roles SET name = %s, apirequests = %d, downloadrequests = %d, defaultinvites = %d, isdefault = %d, canpreview = %d, hideads = %d WHERE id = %d', $this->pdo->escapeString($name), $apirequests, $downloadrequests, $defaultinvites, $isdefault, $canpreview, $hideads, $id));
	}

	/**
	 * @param $id
	 *
	 * @return bool|\PDOStatement
	 */
	public function deleteRole($id)
	{
		$res = $this->pdo->query(sprintf('SELECT id FROM users WHERE role = %d', $id));
		if (count($res) > 0) {
			$userids = [];
			foreach ($res as $user) {
				$userids[] = $user['id'];
			}
			$defaultrole = $this->getDefaultRole();
			$this->pdo->queryExec(sprintf('UPDATE users SET role = %d WHERE id IN (%s)', $defaultrole['id'], implode(',', $userids)));
		}

		return $this->pdo->queryExec(sprintf('DELETE FROM user_roles WHERE id = %d', $id));
	}

	/**
	 * @return array|bool
	 */
	public function getDefaultRole()
	{
		return $this->pdo->queryOneRow('SELECT * FROM user_roles WHERE isdefault = 1');
	}

	/**
	 * Get the quantity of API requests in the last day for the users_id.
	 *
	 * @param int $userID
	 *
	 * @return int
	 */
	public function getApiRequests($userID)
	{
		// Clear old requests.
		$this->clearApiRequests($userID);
		$requests = $this->pdo->queryOneRow(
			sprintf('SELECT COUNT(id) AS num FROM user_requests WHERE users_id = %d', $userID)
		);
		return (!$requests ? 0 : (int)$requests['num']);
	}

	/**
	 * If a user accesses the API, log it.
	 *
	 * @param int    $userID  ID of the user.
	 * @param string $request The API request.
	 *
	 */
	public function addApiRequest($userID, $request): void
	{
		$this->pdo->queryInsert(
			sprintf(
				'INSERT INTO user_requests (users_id, request, timestamp) VALUES (%d, %s, NOW())',
				$userID,
				$this->pdo->escapeString($request)
			)
		);
	}

	/**
	 * Delete api requests older than a day.
	 *
	 * @param int|bool  $userID
	 *                   int The users ID.
	 *                   bool false do all user ID's..
	 *
	 * @return void
	 */
	protected function clearApiRequests($userID): void
	{
		if ($userID === false) {
			$this->pdo->queryExec('DELETE FROM user_requests WHERE timestamp < DATE_SUB(NOW(), INTERVAL 1 DAY)');
		} else {
			$this->pdo->queryExec(
				sprintf(
					'DELETE FROM user_requests WHERE users_id = %d AND timestamp < DATE_SUB(NOW(), INTERVAL 1 DAY)',
					$userID
				)
			);
		}
	}

	/**
	 * deletes old rows FROM the userrequest and user_downloads tables.
	 * if site->userdownloadpurgedays SET to 0 then all release history is removed but
	 * the download/request rows must remain for at least one day to allow the role based
	 * limits to apply.
	 *
	 * @param int $days
	 */
	public function pruneRequestHistory($days = 0)
	{
		if ($days === 0) {
			$days = 1;
			$this->pdo->queryExec('UPDATE user_downloads SET releases_id = null');
		}

		$this->pdo->queryExec(sprintf('DELETE FROM user_requests WHERE timestamp < DATE_SUB(NOW(), INTERVAL %d DAY)', $days));
		$this->pdo->queryExec(sprintf('DELETE FROM user_downloads WHERE timestamp < DATE_SUB(NOW(), INTERVAL %d DAY)', $days));
	}

	/**
	 * Get the COUNT of how many NZB's the user has downloaded in the past day.
	 *
	 * @param int $userID
	 *
	 * @return int
	 */
	public function getDownloadRequests($userID): int
	{
		// Clear old requests.
		$this->pdo->queryExec(
			sprintf(
				'DELETE FROM user_downloads WHERE users_id = %d AND timestamp < DATE_SUB(NOW(), INTERVAL 1 DAY)',
				$userID
			)
		);
		$value = $this->pdo->queryOneRow(
			sprintf(
				'SELECT COUNT(id) AS num FROM user_downloads WHERE users_id = %d AND timestamp > DATE_SUB(NOW(), INTERVAL 1 DAY)',
				$userID
			)
		);
		return ($value === false ? 0 : (int) $value['num']);
	}

	/**
	 * @param $userID
	 *
	 * @return array
	 */
	public function getDownloadRequestsForUser($userID): array
	{
		return $this->pdo->query(sprintf('SELECT u.*, r.guid, r.searchname FROM user_downloads u
										  LEFT OUTER JOIN releases r ON r.id = u.releases_id
										  WHERE u.users_id = %d
										  ORDER BY u.timestamp
										  DESC',
											$userID
										)
									);
	}

	/**
	 * If a user downloads a NZB, log it.
	 *
	 * @param int $userID id of the user.
	 *
	 * @param     $releaseID
	 *
	 * @return bool|int
	 */
	public function addDownloadRequest($userID, $releaseID)
	{
		return $this->pdo->queryInsert(
			sprintf(
				'INSERT INTO user_downloads (users_id, releases_id, timestamp) VALUES (%d, %d, NOW())',
				$userID,
				$releaseID
			)
		);
	}

	/**
	 * @param $releaseID
	 *
	 * @return false|int|string
	 */
	public function delDownloadRequestsForRelease(int $releaseID)
	{
		return $this->pdo->queryInsert(sprintf('DELETE FROM user_downloads WHERE releases_id = %d', $releaseID));
	}

	/**
	 * Checks if a user is a specific role.
	 *
	 * @notes Uses type of $user to denote identifier. if string: username, if int: users_id
	 * @param int $roleID
	 * @param string|int $user
	 * @return bool
	 */
	public function roleCheck($roleID, $user): bool
	{

		if (is_string($user) && strlen($user) > 0) {
			$user = $this->pdo->escapeString($user);
			$querySuffix = "username = $user";
		} elseif (is_int($user) && $user >= 0) {
			$querySuffix = "id = $user";
		} else {
			return false;
		}

		$result = $this->pdo->queryOneRow(
			sprintf(
				'SELECT role FROM users WHERE %s',
				$querySuffix
			)
		);

		return $result['role'] === $roleID;
	}

	/**
	 * Wrapper for roleCheck specifically for Admins.
	 *
	 * @param int $userID
	 * @return bool
	 */
	public function isAdmin($userID) {
		return $this->roleCheck(self::ROLE_ADMIN, (int)$userID);
	}

	/**
	 * Wrapper for roleCheck specifically for Moderators.
	 *
	 * @param int $userId
	 * @return bool
	 */
	public function isModerator($userId) {
		return $this->roleCheck(self::ROLE_MODERATOR, (int)$userId);
	}
}