<?php
namespace chat\data\message;

/**
 * Represents a list of chat messages.
 * 
 * @author 	Tim Düsterhus
 * @copyright	2010-2014 Tim Düsterhus
 * @license	Creative Commons Attribution-NonCommercial-ShareAlike <http://creativecommons.org/licenses/by-nc-sa/3.0/legalcode>
 * @package	be.bastelstu.chat
 * @subpackage	chat.room
 */
class MessageList extends \wcf\data\DatabaseObjectList {
	/**
	 * @see	\wcf\data\DatabaseObjectList::$className
	 */
	public $className = 'chat\data\message\Message';
	
	/**
	 * Reads the newest messages for the given room.
	 * 
	 * @param	\chat\data\room\Room	$room
	 * @param	integer			$number
	 * @return	array<\chat\data\message\Message>
	 */
	public static function getNewestMessages(\chat\data\room\Room $room, $number = CHAT_LASTMESSAGES) {
		if ($number === 0) return array();
		
		$messageList = new static();
		$messageList->sqlOrderBy = "message.messageID DESC";
		$messageList->sqlLimit = $number;
		$messageList->getConditionBuilder()->add('message.receiver IS NULL', array());
		
		if ($room->roomID !== \chat\data\room\Room::GLOBAL_ROOM) {
			$messageList->getConditionBuilder()->add('message.roomID = ?', array($room->roomID));
		}
		
		$messageList->readObjects();
		return array_reverse($messageList->getObjects());
	}
	
	/**
	 * Reads the messages since the given message-id for the given room.
	 * 
	 * @param	\chat\data\room\Room	$room
	 * @param	integer			$since
	 * @return	array<\chat\data\message\Message>
	 */
	public static function getMessagesSince(\chat\data\room\Room $room, $since) {
		$messageList = new static();
		$messageList->sqlOrderBy = "message.messageID ASC";
		$messageList->getConditionBuilder()->add('message.messageID > ?', array($since));
		
		if ($room->roomID !== \chat\data\room\Room::GLOBAL_ROOM) {
			$messageList->getConditionBuilder()->add('
				((
						message.receiver IS NULL
					AND 	message.roomID = ?
				)
				OR message.receiver = ?
				OR message.sender = ?)',
				array($room->roomID, \wcf\system\WCF::getUser()->userID, \wcf\system\WCF::getUser()->userID)
			);
		}
		else {
			$messageList->getConditionBuilder()->add('
				(message.receiver IS NULL
				OR message.receiver = ?
				OR message.sender = ?)',
				array(\wcf\system\WCF::getUser()->userID, \wcf\system\WCF::getUser()->userID)
			);
		}
		
		$messageList->readObjects();
		return $messageList->getObjects();
	}
	
	/**
	 * Reads the message between the given timestamps for the given room.
	 * 
	 * @param	\chat\data\room\Room	$room
	 * @param	integer			$start
	 * @param	integer			$end
	 * @return	array<\chat\data\message\Message>
	 */
	public static function getMessagesBetween(\chat\data\room\Room $room, $start, $end) {
		$messageList = new static();
		$messageList->sqlOrderBy = "message.messageID ASC";
		$messageList->getConditionBuilder()->add('message.receiver IS NULL', array());
		
		if ($room->roomID !== \chat\data\room\Room::GLOBAL_ROOM) {
			$messageList->getConditionBuilder()->add('message.roomID = ?', array($room->roomID));
		}
		
		$messageList->getConditionBuilder()->add('message.time BETWEEN ? AND ?', array($start, $end));
		
		$messageList->readObjects();
		return $messageList->getObjects();
	}
}