<?php
/*
 * Copyright (c) 2010-2018 Tim Düsterhus.
 *
 * Use of this software is governed by the Business Source License
 * included in the LICENSE file.
 *
 * Change Date: 2022-08-16
 *
 * On the date above, in accordance with the Business Source
 * License, use of this software will be governed by version 2
 * or later of the General Public License.
 */

namespace chat\data\room;

use \chat\system\cache\runtime\UserRuntimeCache;
use \chat\system\permission\PermissionHandler;
use \wcf\system\exception\PermissionDeniedException;
use \wcf\system\request\LinkHandler;
use \wcf\system\WCF;
use \wcf\util\StringUtil;

/**
 * Represents a chat room.
 */
final class Room extends \wcf\data\DatabaseObject implements \wcf\system\request\IRouteController
                                                           , \wcf\data\ITitledLinkObject
                                                           , \JsonSerializable {
	/**
	 * User to Room mapping.
	 *
	 * @param	int[]
	 */
	private static $userToRoom = null;

	/**
	 * @see	Room::getTitle()
	 */
	public function __toString() {
		return $this->getTitle();
	}

	/**
	 * Returns whether the given user can see at least
	 * one chat room. If no user is given the current user
	 * should be assumed
	 *
	 * @param	\wcf\data\user\UserProfile	$user
	 * @return	boolean
	 */
	public static function canSeeAny(\wcf\data\user\UserProfile $user = null) {
		$rooms = RoomCache::getInstance()->getRooms();
		foreach ($rooms as $room) {
			if ($room->canSee($user)) return true;
		}

		return false;
	}

	/**
	 * Returns whether the given user can see this room.
	 * If no user is given the current user should be assumed.
	 *
	 * @param	\wcf\data\user\UserProfile	$user
	 * @return	boolean
	 */
	public function canSee(\wcf\data\user\UserProfile $user = null, \Exception &$reason = null) {
		static $cache = [ ];
		if ($user === null) $user = new \wcf\data\user\UserProfile(WCF::getUser());

		if (!isset($cache[$this->roomID])) $cache[$this->roomID] = [];
		if (array_key_exists($user->userID, $cache[$this->roomID])) {
			return ($reason = $cache[$this->roomID][$user->userID]) === null;
		}

		if (!$user->userID) {
			$reason = new PermissionDeniedException();
			return ($cache[$this->roomID][$user->userID] = $reason) === null;
		}

		$result = null;
		if (!PermissionHandler::get($user)->getPermission($this, 'user.canSee')) {
			$result = new PermissionDeniedException();
		}

		$parameters = [ 'user'   => $user
		              , 'result' => $result
		              ];
		\wcf\system\event\EventHandler::getInstance()->fireAction($this, 'canSee', $parameters);
		$reason = $parameters['result'];

		if (!($reason === null || $reason instanceof \Exception || $reason instanceof \Throwable)) {
			throw new \DomainException('Result of canSee must be a \Throwable or null.');
		}

		return ($cache[$this->roomID][$user->userID] = $reason) === null;
	}

	/**
	 * Returns whether the given user can see the log of this room.
	 * If no user is given the current user should be assumed.
	 *
	 * @param	\wcf\data\user\UserProfile	$user
	 * @return	boolean
	 */
	public function canSeeLog(\wcf\data\user\UserProfile $user = null, \Exception &$reason = null) {
		static $cache = [ ];
		if ($user === null) $user = new \wcf\data\user\UserProfile(WCF::getUser());

		if (!isset($cache[$this->roomID])) $cache[$this->roomID] = [];
		if (array_key_exists($user->userID, $cache[$this->roomID])) {
			return ($reason = $cache[$this->roomID][$user->userID]) === null;
		}

		$result = null;
		if (!PermissionHandler::get($user)->getPermission($this, 'user.canSeeLog')) {
			$result = new PermissionDeniedException();
		}

		$parameters = [ 'user'   => $user
		              , 'result' => $result
		              ];
		\wcf\system\event\EventHandler::getInstance()->fireAction($this, 'canSeeLog', $parameters);
		$reason = $parameters['result'];

		if (!($reason === null || $reason instanceof \Exception || $reason instanceof \Throwable)) {
			throw new \DomainException('Result of canSeeLog must be a \Throwable or null.');
		}

		return ($cache[$this->roomID][$user->userID] = $reason) === null;
	}

	/**
	 * Returns whether the given user can join this room.
	 * If no user is given the current user should be assumed.
	 *
	 * @param	\wcf\data\user\UserProfile	$user
	 * @return	boolean
	 */
	public function canJoin(\wcf\data\user\UserProfile $user = null, \Exception &$reason = null) {
		static $cache = [ ];
		if ($user === null) $user = new \wcf\data\user\UserProfile(WCF::getUser());

		if (!isset($cache[$this->roomID])) $cache[$this->roomID] = [];
		if (array_key_exists($user->userID, $cache[$this->roomID])) {
			return ($reason = $cache[$this->roomID][$user->userID]) === null;
		}

		$parameters = [ 'user' => $user
		              , 'result' => null
		              ];
		\wcf\system\event\EventHandler::getInstance()->fireAction($this, 'canJoin', $parameters);
		$reason = $parameters['result'];

		if (!($reason === null || $reason instanceof \Exception || $reason instanceof \Throwable)) {
			throw new \DomainException('Result of canJoin must be a \Throwable or null.');
		}

		return ($cache[$this->roomID][$user->userID] = $reason) === null;
	}

	/**
	 * Returns whether the given user can write public messages in this room.
	 * If no user is given the current user should be assumed.
	 *
	 * @param	\wcf\data\user\UserProfile	$user
	 * @return	boolean
	 */
	public function canWritePublicly(\wcf\data\user\UserProfile $user = null, \Exception &$reason = null) {
		static $cache = [ ];
		if ($user === null) $user = new \wcf\data\user\UserProfile(WCF::getUser());

		if (!isset($cache[$this->roomID])) $cache[$this->roomID] = [];
		if (array_key_exists($user->userID, $cache[$this->roomID])) {
			return ($reason = $cache[$this->roomID][$user->userID]) === null;
		}

		$result = null;
		if (!PermissionHandler::get($user)->getPermission($this, 'user.canWrite')) {
			$result = new PermissionDeniedException();
		}

		$parameters = [ 'user'   => $user
		              , 'result' => $result
		              ];
		\wcf\system\event\EventHandler::getInstance()->fireAction($this, 'canWritePublicly', $parameters);
		$reason = $parameters['result'];

		if (!($reason === null || $reason instanceof \Exception || $reason instanceof \Throwable)) {
			throw new \DomainException('Result of canWritePublicly must be a \Throwable or null.');
		}

		return ($cache[$this->roomID][$user->userID] = $reason) === null;
	}

	/**
	 * @inheritDoc
	 */
	public function getTitle() {
		return WCF::getLanguage()->get($this->title);
	}

	/**
	 * @inheritDoc
	 */
	public function getTopic() {
		$topic = StringUtil::trim(WCF::getLanguage()->get($this->topic));

		if (!$this->topicUseHtml) {
			$topic = StringUtil::encodeHTML($topic);
		}

		return $topic;
	}

	/**
	 * Returns an array of users in this room.
	 */
	public function getUsers() {
		if (self::$userToRoom === null) {
			$sql = "SELECT     r2u.userID, r2u.roomID
			        FROM       chat".WCF_N."_room_to_user r2u
			        INNER JOIN wcf".WCF_N."_user u
			                ON r2u.userID = u.userID
			        WHERE      r2u.active = ?
			        ORDER BY   u.username ASC";
			$statement = WCF::getDB()->prepareStatement($sql);
			$statement->execute([ 1 ]);
			self::$userToRoom = $statement->fetchMap('roomID', 'userID', false);

			if (!empty(self::$userToRoom)) {
				UserRuntimeCache::getInstance()->cacheObjectIDs(array_merge(...self::$userToRoom));
			}
		}

		if (!isset(self::$userToRoom[$this->roomID])) return [ ];

		return UserRuntimeCache::getInstance()->getObjects(self::$userToRoom[$this->roomID]);
	}

	/**
	 * @inheritDoc
	 */
	public function getLink() {
		return LinkHandler::getInstance()->getLink('Room', [ 'application'   => 'chat'
		                                                   , 'object'        => $this
		                                                   , 'forceFrontend' => true
		                                                   ]
		                                          );
	}

	/**
	 * @inheritDoc
	 */
	public function jsonSerialize() {
		return [ 'title' => $this->getTitle()
		       , 'topic' => $this->getTopic()
		       , 'link'  => $this->getLink()
		       ];
	}
}