<?php
namespace wcf\page;
use wcf\data\conversation\label\ConversationLabel;
use wcf\data\conversation\label\ConversationLabelList;
use wcf\data\conversation\message\ConversationMessage;
use wcf\data\conversation\message\ViewableConversationMessageList;
use wcf\data\conversation\Conversation;
use wcf\data\conversation\ConversationAction;
use wcf\data\conversation\ConversationParticipantList;
use wcf\data\conversation\ViewableConversation;
use wcf\data\modification\log\ConversationLogModificationLogList;
use wcf\data\smiley\SmileyCache;
use wcf\system\attachment\AttachmentHandler;
use wcf\system\bbcode\BBCodeHandler;
use wcf\system\exception\IllegalLinkException;
use wcf\system\exception\PermissionDeniedException;
use wcf\system\message\quote\MessageQuoteManager;
use wcf\system\page\PageLocationManager;
use wcf\system\page\ParentPageLocation;
use wcf\system\request\LinkHandler;
use wcf\system\WCF;
use wcf\util\HeaderUtil;
use wcf\util\StringUtil;

/**
 * Shows a conversation.
 * 
 * @author	Marcel Werk
 * @copyright	2001-2017 WoltLab GmbH
 * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 * @package	WoltLabSuite\Core\Page
 * 
 * @property	ViewableConversationMessageList		$objectList
 */
class ConversationPage extends MultipleLinkPage {
	/**
	 * @inheritDoc
	 */
	public $itemsPerPage = CONVERSATION_MESSAGES_PER_PAGE;
	
	/**
	 * @inheritDoc
	 */
	public $sortOrder = 'ASC';
	
	/**
	 * @inheritDoc
	 */
	public $objectListClassName = ViewableConversationMessageList::class;
	
	/**
	 * @inheritDoc
	 */
	public $loginRequired = true;
	
	/**
	 * @inheritDoc
	 */
	public $neededModules = ['MODULE_CONVERSATION'];
	
	/**
	 * @inheritDoc
	 */
	public $neededPermissions = ['user.conversation.canUseConversation'];
	
	/**
	 * conversation id
	 * @var	integer
	 */
	public $conversationID = 0;
	
	/**
	 * viewable conversation object
	 * @var	ViewableConversation
	 */
	public $conversation;
	
	/**
	 * conversation label list
	 * @var	ConversationLabelList
	 */
	public $labelList;
	
	/**
	 * message id
	 * @var	integer
	 */
	public $messageID = 0;
	
	/**
	 * conversation message object
	 * @var	ConversationMessage
	 */
	public $message;
	
	/**
	 * modification log list object
	 * @var	ConversationLogModificationLogList
	 */
	public $modificationLogList;
	
	/**
	 * list of participants
	 * @var	ConversationParticipantList
	 */
	public $participantList;
	
	/**
	 * @inheritDoc
	 */
	public function readParameters() {
		parent::readParameters();
		
		if (isset($_REQUEST['id'])) $this->conversationID = intval($_REQUEST['id']);
		if (isset($_REQUEST['messageID'])) $this->messageID = intval($_REQUEST['messageID']);
		if ($this->messageID) {
			$this->message = new ConversationMessage($this->messageID);
			if (!$this->message->messageID) {
				throw new IllegalLinkException();
			}
			$this->conversationID = $this->message->conversationID;
		}
		
		$this->conversation = Conversation::getUserConversation($this->conversationID, WCF::getUser()->userID);
		if ($this->conversation === null) {
			throw new IllegalLinkException();
		}
		if (!$this->conversation->canRead()) {
			throw new PermissionDeniedException();
		}
		
		// load labels
		$this->labelList = ConversationLabel::getLabelsByUser();
		$this->conversation = ViewableConversation::getViewableConversation($this->conversation, $this->labelList);
		
		// messages per page
		/** @noinspection PhpUndefinedFieldInspection */
		if (WCF::getUser()->conversationMessagesPerPage) {
			/** @noinspection PhpUndefinedFieldInspection */
			$this->itemsPerPage = WCF::getUser()->conversationMessagesPerPage;
		}
		
		$this->canonicalURL = LinkHandler::getInstance()->getLink('Conversation', [
			'object' => $this->conversation
		], ($this->pageNo ? 'pageNo=' . $this->pageNo : ''));
	}
	
	/**
	 * @inheritDoc
	 */
	protected function initObjectList() {
		parent::initObjectList();
		
		$this->objectList->getConditionBuilder()->add('conversation_message.conversationID = ?', [$this->conversation->conversationID]);
		$this->objectList->setConversation($this->conversation->getDecoratedObject());
		
		// handle visibility filter
		if ($this->conversation->joinedAt > 0) $this->objectList->getConditionBuilder()->add('conversation_message.time >= ?', [$this->conversation->joinedAt]);
		if ($this->conversation->leftAt > 0) $this->objectList->getConditionBuilder()->add('conversation_message.time <= ?', [$this->conversation->leftAt]);
		
		// handle jump to
		if ($this->action == 'lastPost') $this->goToLastPost();
		if ($this->action == 'firstNew') $this->goToFirstNewPost();
		if ($this->messageID) $this->goToPost();
	}
	
	/**
	 * @inheritDoc
	 */
	public function readData() {
		parent::readData();
		
		// add breadcrumbs
		if ($this->conversation->isDraft) {
			// `-1` = pseudo object id to have to pages with identifier `com.woltlab.wcf.conversation.ConversationList`
			PageLocationManager::getInstance()->addParentLocation('com.woltlab.wcf.conversation.ConversationList', -1, new ParentPageLocation(
				WCF::getLanguage()->get('wcf.conversation.folder.draft'),
				LinkHandler::getInstance()->getLink('ConversationList', ['filter' => 'draft'])
			));
		}
		PageLocationManager::getInstance()->addParentLocation('com.woltlab.wcf.conversation.ConversationList');
		
		// update last visit time count
		if ($this->conversation->isNew() && $this->objectList->getMaxPostTime() > $this->conversation->lastVisitTime) {
			$visitTime = $this->objectList->getMaxPostTime();
			if ($visitTime == $this->conversation->lastPostTime) $visitTime = TIME_NOW;
			$conversationAction = new ConversationAction([$this->conversation->getDecoratedObject()], 'markAsRead', ['visitTime' => $visitTime]);
			$conversationAction->executeAction();
		}
		
		// get participants
		$this->participantList = new ConversationParticipantList($this->conversationID, WCF::getUser()->userID, $this->conversation->userID == WCF::getUser()->userID);
		$this->participantList->readObjects();
		
		// init quote objects
		$messageIDs = [];
		foreach ($this->objectList as $message) {
			$messageIDs[] = $message->messageID;
		}
		MessageQuoteManager::getInstance()->initObjects('com.woltlab.wcf.conversation.message', $messageIDs);
		
		// set attachment permissions
		if ($this->objectList->getAttachmentList() !== null) {
			$this->objectList->getAttachmentList()->setPermissions([
				'canDownload' => true,
				'canViewPreview' => true
			]);
		}
		
		// get timeframe for modifications
		$this->objectList->rewind();
		$startTime = ($this->conversation->joinedAt ?: $this->objectList->current()->time);
		$endTime = ($this->conversation->leftAt ?: TIME_NOW);
		
		$count = count($this->objectList);
		if ($count > 1) {
			$this->objectList->seek($count - 1);
			if ($this->objectList->current()->time < $this->conversation->lastPostTime) {
				$sql = "SELECT          time
					FROM            wcf".WCF_N."_conversation_message
					WHERE           conversationID = ?
							AND time > ?
					ORDER BY        time";
				$statement = WCF::getDB()->prepareStatement($sql, 1);
				$statement->execute([$this->conversationID, $this->objectList->current()->time]);
				$endTime = $statement->fetchSingleColumn() - 1;
			}	
		}
		$this->objectList->rewind();
		
		// load modification log entries
		$this->modificationLogList = new ConversationLogModificationLogList($this->conversation->conversationID);
		$this->modificationLogList->getConditionBuilder()->add("modification_log.time BETWEEN ? AND ?", [$startTime, $endTime]);
		$this->modificationLogList->readObjects();
	}
	
	/**
	 * @inheritDoc
	 */
	public function assignVariables() {
		parent::assignVariables();
		
		MessageQuoteManager::getInstance()->assignVariables();
		
		$tmpHash = StringUtil::getRandomID();
		$attachmentHandler = new AttachmentHandler('com.woltlab.wcf.conversation.message', 0, $tmpHash, 0);
		
		WCF::getTPL()->assign([
			'attachmentHandler' => $attachmentHandler,
			'attachmentObjectID' => 0,
			'attachmentObjectType' => 'com.woltlab.wcf.conversation.message',
			'attachmentParentObjectID' => 0,
			'tmpHash' => $tmpHash,
			'attachmentList' => $this->objectList->getAttachmentList(),
			'labelList' => $this->labelList,
			'modificationLogList' => $this->modificationLogList,
			'sortOrder' => $this->sortOrder,
			'conversation' => $this->conversation,
			'conversationID' => $this->conversationID,
			'participants' => $this->participantList->getObjects(),
			'defaultSmilies' => SmileyCache::getInstance()->getCategorySmilies()
		]);
		
		BBCodeHandler::getInstance()->setDisallowedBBCodes(explode(',', WCF::getSession()->getPermission('user.message.disallowedBBCodes')));
	}
	
	/**
	 * Calculates the position of a specific post in this conversation.
	 */
	protected function goToPost() {
		$conditionBuilder = clone $this->objectList->getConditionBuilder();
		$conditionBuilder->add('time '.($this->sortOrder == 'ASC' ? '<=' : '>=').' ?', [$this->message->time]);
		
		$sql = "SELECT	COUNT(*) AS messages
			FROM	wcf".WCF_N."_conversation_message conversation_message
			".$conditionBuilder;
		$statement = WCF::getDB()->prepareStatement($sql);
		$statement->execute($conditionBuilder->getParameters());
		$row = $statement->fetchArray();
		$this->pageNo = intval(ceil($row['messages'] / $this->itemsPerPage));
	}
	
	/**
	 * Gets the id of the last post in this conversation and forwards the user to this post.
	 */
	protected function goToLastPost() {
		$sql = "SELECT		conversation_message.messageID
			FROM		wcf".WCF_N."_conversation_message conversation_message
			".$this->objectList->getConditionBuilder()."
			ORDER BY	time ".($this->sortOrder == 'ASC' ? 'DESC' : 'ASC');
		$statement = WCF::getDB()->prepareStatement($sql, 1);
		$statement->execute($this->objectList->getConditionBuilder()->getParameters());
		$row = $statement->fetchArray();
		HeaderUtil::redirect(LinkHandler::getInstance()->getLink('Conversation', [
			'encodeTitle' => true,
			'object' => $this->conversation,
			'messageID' => $row['messageID']
		]).'#message'.$row['messageID']);
		exit;
	}
	
	/**
	 * Forwards the user to the first new message in this conversation.
	 */
	protected function goToFirstNewPost() {
		$conditionBuilder = clone $this->objectList->getConditionBuilder();
		$conditionBuilder->add('time > ?', [$this->conversation->lastVisitTime]);
		
		$sql = "SELECT		conversation_message.messageID
			FROM		wcf".WCF_N."_conversation_message conversation_message
			".$conditionBuilder."
			ORDER BY	time ASC";
		$statement = WCF::getDB()->prepareStatement($sql, 1);
		$statement->execute($conditionBuilder->getParameters());
		$row = $statement->fetchArray();
		if ($row !== false) {
			HeaderUtil::redirect(LinkHandler::getInstance()->getLink('Conversation', [
				'encodeTitle' => true,
				'object' => $this->conversation,
				'messageID' => $row['messageID']
			]).'#message'.$row['messageID']);
			exit;
		}
		else {
			$this->goToLastPost();
		}
	}
}