<?php
/**
 * Nextcloud - News
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author    Alessandro Cosentino <cosenal@gmail.com>
 * @author    Bernhard Posselt <dev@bernhard-posselt.com>
 * @copyright 2012 Alessandro Cosentino
 * @copyright 2012-2014 Bernhard Posselt
 */

namespace OCA\News\Db\Mysql;

use OCA\News\Utility\Time;
use OCP\IDBConnection;

class ItemMapper extends \OCA\News\Db\ItemMapper
{

    public function __construct(IDBConnection $db, Time $time)
    {
        parent::__construct($db, $time);
    }


    /**
     * Delete all items for feeds that have over $threshold unread and not
     * starred items
     *
     * @param int $threshold the number of items that should be deleted
     */
    public function deleteReadOlderThanThreshold($threshold)
    {
        $sql = 'SELECT (COUNT(*) - `feeds`.`articles_per_update`) AS `size`, ' .
        '`feeds`.`id` AS `feed_id`, `feeds`.`articles_per_update` ' .
            'FROM `*PREFIX*news_items` `items` ' .
            'JOIN `*PREFIX*news_feeds` `feeds` ' .
                'ON `feeds`.`id` = `items`.`feed_id` ' .
                'AND `items`.`unread` = ? ' .
                'AND `items`.`starred` = ? ' .
            'GROUP BY `feeds`.`id`, `feeds`.`articles_per_update` ' .
            'HAVING COUNT(*) > ?';
        $params = [false, false, $threshold];
        $result = $this->execute($sql, $params);

        while ($row = $result->fetch()) {
            $size = (int) $row['size'];
            $limit = $size - $threshold;

            if ($limit > 0) {
                $params = [false, false, $row['feed_id'], $limit];

                $sql = 'DELETE FROM `*PREFIX*news_items` ' .
                    'WHERE `unread` = ? ' .
                    'AND `starred` = ? ' .
                    'AND `feed_id` = ? ' .
                    'ORDER BY `id` ASC ' .
                    'LIMIT ?';

                $this->execute($sql, $params);
            }
        }
    }

    public function readItem($itemId, $isRead, $lastModified, $userId)
    {
        $item = $this->find($itemId, $userId);

        if ($isRead) {
            $sql = 'UPDATE `*PREFIX*news_items` `items`
                JOIN `*PREFIX*news_feeds` `feeds`
                    ON `feeds`.`id` = `items`.`feed_id`
                SET `items`.`unread` = ?,
                    `items`.`last_modified` = ?
                WHERE `items`.`fingerprint` = ?
                    AND `feeds`.`user_id` = ?';
            $params = [false, $lastModified, $item->getFingerprint(), $userId];
            $this->execute($sql, $params);
        } else {
            $item->setLastModified($lastModified);
            $item->setUnread(true);
            $this->update($item);
        }
    }
}