<?php
/**
* ownCloud - News app
*
* @author Alessandro Cosentino
* Copyright (c) 2012 - Alessandro Cosentino <cosenal@gmail.com>
* 
* This file is licensed under the Affero General Public License version 3 or later.
* See the COPYING-README file
* 
*/

namespace OCA\News;

/**
 * This class maps an item to a row of the items table in the database.
 * It follows the Data Mapper pattern (see http://martinfowler.com/eaaCatalog/dataMapper.html).
 */
class ItemMapper {

	const tableName = '*PREFIX*news_items';
	private $userid;

	public function __construct($userid = null){
		if ($userid !== null) {
			$this->userid = $userid;
		}
		$this->userid = \OCP\USER::getUser();
	}

	/**
	 * @brief 
	 * @param row a row from the items table of the database
	 * @returns an object of the class OC_News_Item
	 */
	public function fromRow($row){
		$url = $row['url'];
		$title = $row['title'];
		$guid = $row['guid'];
		$status = $row['status'];
		$body = $row['body'];
		$id = $row['id'];
		$item = new Item($url, $title, $guid, $body, $id);
		$item->setStatus($status);
		$date = $row['date'];
		$author = $row['author'];
		$item->setAuthor($author);
		
		return $item;
	}
	
	/**
	 * @brief Retrieve all the item corresponding to a feed from the database
	 * @param feedid The id of the feed in the database table.
	 */
	public function findAll($feedid){
		$stmt = \OCP\DB::prepare('SELECT * FROM ' . self::tableName . ' WHERE feed_id = ?');
		$result = $stmt->execute(array($feedid));
	
		$items = array();
		while ($row = $result->fetchRow()) {
			$item = $this->fromRow($row);
			$items[] = $item;
		}

		return $items;
	}
	
	/**
	 * @brief Retrieve all the items corresponding to a feed from the database with a particular status
	 * @param feedid The id of the feed in the database table.
	 * @param status one of the constants defined in OCA\News\StatusFlag
	 */
	public function findAllStatus($feedid, $status){
		$stmt = \OCP\DB::prepare('SELECT * FROM ' . self::tableName . ' 
				WHERE feed_id = ?
				AND (status & ?)');
		$result = $stmt->execute(array($feedid, $status));
	
		$items = array();
		while ($row = $result->fetchRow()) {
			$item = $this->fromRow($row);
			$items[] = $item;
		}

		return $items;
	}
	
	public function countAllStatus($feedid, $status){
		$stmt = \OCP\DB::prepare('SELECT COUNT(*) as size FROM ' . self::tableName . ' 
				WHERE feed_id = ?
				AND (status & ?)');
		$result=$stmt->execute(array($feedid, $status))->fetchRow();
		return $result['size'];
	}
	

	public function findIdFromGuid($guid_hash, $guid, $feedid){
		$stmt = \OCP\DB::prepare('
				SELECT * FROM ' . self::tableName . ' 
				WHERE guid_hash = ?
				AND feed_id = ?
				');
		$result = $stmt->execute(array($guid_hash, $feedid));
		//TODO: if there is more than one row, falling back to comparing $guid
		$row = $result->fetchRow();
		$id = null;
		if ($row != null){
			$id = $row['id'];
		}
		return $id;
	}

	/**
	 * @brief Update the item after its status has changed
	 * @returns The item whose status has changed.
	 */
	public function update(Item $item){
		
		$itemid = $item->getId();
		$status = $item->getStatus();
		
		$stmt = \OCP\DB::prepare('
				UPDATE ' . self::tableName .
				' SET status = ?
				WHERE id = ?
				');
			
		$params=array(
			$status,
			$itemid
			);
		$stmt->execute($params);
		
		return true;
	}
	
	/**
	 * @brief Save the feed and all its items into the database
	 * @returns The id of the feed in the database table.
	 */
	public function save(Item $item, $feedid){
		$guid = $item->getGuid();
		$guid_hash = md5($guid);
		
		$status = $item->getStatus();

		$itemid =  $this->findIdFromGuid($guid_hash, $guid, $feedid);
		
		if ($itemid == null){
			$title = $item->getTitle();
			$body = $item->getBody();

			$stmt = \OCP\DB::prepare('
				INSERT INTO ' . self::tableName .
				'(url, title, body, guid, guid_hash, feed_id, status)
				VALUES (?, ?, ?, ?, ?, ?, ?)
				');

			if(empty($title)) {
				$l = \OC_L10N::get('news');
				$title = $l->t('no title');
			}

			if(empty($body)) {
				$l = \OC_L10N::get('news');
				$body = $l->t('no body');
			}
			
			$params=array(
				$item->getUrl(),
				$title,
				$body,
				$guid,
				$guid_hash,
				$feedid,
				$status
			);
			
			$stmt->execute($params);
			
			$itemid = \OCP\DB::insertid(self::tableName);
		}
		else {
			$this->update($item);
		}
		$item->setId($itemid);
		return $itemid;
	}
	
	/**
	 * @brief Retrieve an item from the database
	 * @param id The id of the feed in the database table.
	 */
	public function find($id){
		$stmt = \OCP\DB::prepare('SELECT * FROM ' . self::tableName . ' WHERE id = ?');
		$result = $stmt->execute(array($id));
		$row = $result->fetchRow();

		$item = $this->fromRow($row);
		
		return $item;

	}

	
	/**
	 * @brief Permanently delete all items belonging to a feed from the database
	 * @param feedid The id of the feed that we wish to delete
	 * @return 
	 */
	public function deleteAll($feedid){
		if ($feedid == null) {
			return false;
		}
		$stmt = \OCP\DB::prepare('DELETE FROM ' . self::tableName .' WHERE feed_id = ?');

		$result = $stmt->execute(array($feedid));
		
		return $result;
	}
}