<?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 2020 Sean Molenaar
 */

namespace OCA\News\Db;

use Doctrine\DBAL\FetchMode;
use OCA\News\Utility\Time;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Db\Entity;
use OCP\AppFramework\Db\MultipleObjectsReturnedException;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IDBConnection;

/**
 * Class ItemMapper
 *
 * @package OCA\News\Db
 */
class ItemMapperV2 extends NewsMapperV2
{
    const TABLE_NAME = 'news_items';

    /**
     * ItemMapper constructor.
     *
     * @param IDBConnection $db
     * @param Time          $time
     */
    public function __construct(IDBConnection $db, Time $time)
    {
        parent::__construct($db, $time, Item::class);
    }

    /**
     * Find all feeds for a user.
     *
     * @param string $userId The user identifier
     * @param array  $params Filter parameters
     *
     * @return Entity[]
     */
    public function findAllFromUser(string $userId, array $params = []): array
    {
        $builder = $this->db->getQueryBuilder();
        $builder->select('items.*')
                ->from($this->tableName)
                ->innerJoin('items', FeedMapperV2::TABLE_NAME, 'feeds', 'items.feed_id = feeds.id')
                ->where('feeds.user_id = :user_id')
                ->andWhere('deleted_at = 0')
                ->setParameter(':user_id', $userId, IQueryBuilder::PARAM_STR);

        foreach ($params as $key => $value) {
            $builder->andWhere("${key} = :${key}")
                    ->setParameter(":${key}", $value);
        }

        return $this->findEntities($builder);
    }

    /**
     * Find all items
     *
     * @return Entity[]
     */
    public function findAll(): array
    {
        $builder = $this->db->getQueryBuilder();
        $builder->addSelect('*')
            ->from($this->tableName)
            ->andWhere('deleted_at = 0');

        return $this->findEntities($builder);
    }

    public function findFromUser(string $userId, int $id): Entity
    {
        $builder = $this->db->getQueryBuilder();
        $builder->select('items.*')
            ->from($this->tableName)
            ->innerJoin('items', FeedMapperV2::TABLE_NAME, 'feeds', 'items.feed_id = feeds.id')
            ->where('feeds.user_id = :user_id')
            ->andWhere('items.id = :item_id')
            ->andWhere('deleted_at = 0')
            ->setParameter(':user_id', $userId, IQueryBuilder::PARAM_STR)
            ->setParameter(':item_id', $id, IQueryBuilder::PARAM_STR);

        return $this->findEntity($builder);
    }

    /**
     * Find an item by a GUID hash.
     *
     * @param int    $feedId   ID of the feed
     * @param string $guidHash hash to find with
     *
     * @return Item|Entity
     *
     * @throws DoesNotExistException
     * @throws MultipleObjectsReturnedException
     */
    public function findByGuidHash(int $feedId, string $guidHash): Item
    {
        $builder = $this->db->getQueryBuilder();
        $builder->addSelect('*')
            ->from($this->tableName)
            ->andWhere('feed_id = :feed_id')
            ->andWhere('guid_hash = :guid_hash')
            ->setParameter(':feed_id', $feedId, IQueryBuilder::PARAM_INT)
            ->setParameter(':guid_hash', $guidHash, IQueryBuilder::PARAM_STR);

        return $this->findEntity($builder);
    }

    public function findAllForFeed(int $feedId): array
    {
        $builder = $this->db->getQueryBuilder();
        $builder->addSelect('*')
            ->from($this->tableName)
            ->andWhere('feed_id = :feed_id')
            ->setParameter(':feed_id', $feedId, IQueryBuilder::PARAM_INT);

        return $this->findEntities($builder);
    }

    /**
     * Delete items from feed that are over the max item threshold
     *
     * @param int $threshold Deletion threshold
     */
    public function deleteOverThreshold(int $threshold)
    {
        $builder = $this->db->getQueryBuilder();

        $query = $builder->addSelect('COUNT(*)')
                         ->from($this->tableName)
                         ->groupBy('feed_id')
                         ->where('');

        return $this->db->executeQuery($query)->fetch(FetchMode::ASSOCIATIVE);
    }
}