<?php
defined('WEKIT_VERSION') || exit('Forbidden');

Wind::import('LIB:base.PwBaseDbCache');

/**
 * 回复缓存数据接口
 *
 * @author Jianmin Chen <sky_hold@163.com>
 * @copyright 2003-2103 phpwind.com
 * @license http://www.phpwind.com
 * @version $Id: PwPostDbCache.php 22207 2012-12-19 17:13:36Z jieyin $
 * @package src.service.user
 */
class PwPostDbCache extends PwBaseDbCache {
	
	protected $keys = array(
		'post' => array('post_%s', array('pid'), PwCache::USE_DBCACHE, 'forum', 0, array('forum.dao.PwPostsDao', 'getPost')),
		'post_list' => array('post_list_%s_%s_%s_%s_%s', array('tver', 'tid', 'limit', 'offset', 'asc'), PwCache::USE_DBCACHE, 'forum', 0),
		'post_tver' => array('post_tver_%s', array('tid'), PwCache::USE_DBCACHE, 'forum', 0, 0),
	);

	public function fetchKeysByPid($pids) {
		$keys = array();
		foreach ($pids as $pid) {
			$keys[] = array('post', array($pid));
		}
		return $keys;
	}

	public function getPost($pid) {
		return Wekit::cache()->get('post', array($pid));
	}

	public function fetchPost($pids) {
		$result = array();
		$data = Wekit::cache()->fetch($this->fetchKeysByPid($pids));
		foreach ($data as $key => $value) {
			list(, $pid) = explode('_', $key);
			if (isset($result[$pid])) {
				$result[$pid] = array_merge($result[$pid], $value);
			} else {
				$result[$pid] = $value;
			}
		}
		return $result;
	}

	public function getPostByTid($tid, $limit, $offset, $asc) {
		$orderby = $asc ? 'ASC' : 'DESC';
		$tver = Wekit::cache()->get('post_tver', array($tid));
		$data = Wekit::cache()->get('post_list', array($tver, $tid, $limit, $offset, $orderby));
		if ($data === false) {
			$result = $this->_getDao()->getPostByTid($tid, $limit, $offset, $asc);
			Wekit::cache()->set('post_list', array_keys($result), array($tver, $tid, $limit, $offset, $orderby));
		} else {
			$result = $this->fetchPost($data);
		}
		return $result;
	}

	public function addPost($fields) {
		if ($fields['tid'] && (!isset($fields['disabled']) || $fields['disabled'] == 0)) {
			$this->clearPostListCache($fields['tid']);
		}
		return $this->_getDao()->addPost($fields);
	}

	public function updatePost($pid, $fields, $increaseFields = array()) {
		if (isset($fields['disabled']) || isset($fields['created_time']) || isset($fields['tid'])) {
			$this->updatePostList($pid, isset($fields['tid']) ? $fields['tid'] : 0);
		}
		Wekit::cache()->delete('post', array($pid));
		return $this->_getDao()->updatePost($pid, $fields, $increaseFields);
	}

	public function batchUpdatePost($pids, $fields, $increaseFields = array()) {
		if (isset($fields['disabled']) || isset($fields['created_time']) || isset($fields['tid'])) {
			$this->batchUpdatePostList($pids, isset($fields['tid']) ? $fields['tid'] : 0);
		}
		Wekit::cache()->batchDelete($this->fetchKeysByPid($pids));
		return $this->_getDao()->batchUpdatePost($pids, $fields, $increaseFields);
	}

	public function deletePost($pid) {
		$this->updatePostList($pid);
		Wekit::cache()->delete('post', array($pid));
		return $this->_getDao()->deletePost($pid);
	}

	public function batchDeletePost($pids) {
		$this->batchUpdatePostList($pids);
		Wekit::cache()->batchDelete($this->fetchKeysByPid($pids));
		return $this->_getDao()->batchDeletePost($pids);
	}
	
	/*
	public function revertPost($tids) {
		foreach ($tids as $_tid) {
			$this->clearPostListCache($_tid);
		}
		Wekit::cache()->batchDelete($this->fetchKeysByPid($pids));
		return $this->_getDao()->revertPost($tids);
	}*/
	
	/**
	 * 清除一个帖子的列表缓存
	 *
	 * @param int $tid
	 */
	public function clearPostListCache($tid) {
		Wekit::cache()->increment('post_tver', array($tid));
	}
	
	/**
	 * 更新一个回复，清除所属帖子的列表缓存
	 *
	 * @param int $pid
	 * @param int $tid
	 */
	public function updatePostList($pid, $tid = 0) {
		$post = $this->getPost($pid);
		$this->clearPostListCache($post['tid']);
		if ($tid && $tid != $post['tid']) {
			$this->clearPostListCache($tid);
		}
	}
	
	/**
	 * 更新多个回复时，清除所属帖子的列表缓存
	 *
	 * @param array $tids
	 * @param int $fid
	 */
	public function batchUpdatePostList($pids, $tid = 0) {
		$posts = $this->fetchPost($pids);
		$tids = array();
		foreach ($posts as $post) {
			$tids[] = $post['tid'];
		}
		if ($tid) {
			$tids[] = $tid;
		}
		$tids = array_unique($tids);
		foreach ($tids as $_tid) {
			$this->clearPostListCache($_tid);
		}
	}
}