<?php
namespace Domain\Banner;

/**
 * Repository odpowiedzialny za dostęp do danych banerów
 */
class BannerRepository
{
    private const MAX_PER_PAGE = 100;

    private $db;

    public function __construct($db)
    {
        $this->db = $db;
    }

    /**
     * Pobiera baner po ID wraz z tłumaczeniami
     *
     * @param int $bannerId ID banera
     * @return array|null Dane banera lub null
     */
    public function find(int $bannerId): ?array
    {
        $banner = $this->db->get('pp_banners', '*', ['id' => $bannerId]);

        if (!$banner) {
            return null;
        }

        $results = $this->db->select('pp_banners_langs', '*', ['id_banner' => $bannerId]);
        if (is_array($results)) {
            foreach ($results as $row) {
                $banner['languages'][$row['id_lang']] = $row;
            }
        }

        return $banner;
    }

    /**
     * Usuwa baner
     *
     * @param int $bannerId ID banera
     * @return bool Czy usunięto
     */
    public function delete(int $bannerId): bool
    {
        $result = $this->db->delete('pp_banners', ['id' => $bannerId]);
        return $result !== false;
    }

    /**
     * Zapisuje baner (insert lub update)
     *
     * @param array $data Dane banera
     * @return int|false ID banera lub false
     */
    public function save(array $data)
    {
        $bannerId = $data['id'] ?? null;

        $bannerData = [
            'name'       => $data['name'],
            'status'     => $data['status'] == 'on' ? 1 : 0,
            'date_start' => $data['date_start'] != '' ? $data['date_start'] : null,
            'date_end'   => $data['date_end'] != '' ? $data['date_end'] : null,
            'home_page'  => $data['home_page'] == 'on' ? 1 : 0,
        ];

        if (!$bannerId) {
            $this->db->insert('pp_banners', $bannerData);
            $bannerId = $this->db->id();
            if (!$bannerId) {
                return false;
            }
        } else {
            $this->db->update('pp_banners', $bannerData, ['id' => (int)$bannerId]);
        }

        $this->saveTranslations($bannerId, $data['src'], $data['url'], $data['html'], $data['text']);

        return (int)$bannerId;
    }

    /**
     * Zwraca liste banerow do panelu admin z filtrowaniem, sortowaniem i paginacja.
     *
     * @return array{items: array<int, array<string, mixed>>, total: int}
     */
    public function listForAdmin(
        array $filters,
        string $sortColumn = 'name',
        string $sortDir = 'ASC',
        int $page = 1,
        int $perPage = 15
    ): array {
        $sortColumn = trim($sortColumn);
        $sortDir = strtoupper(trim($sortDir));

        $allowedSortColumns = [
            'name' => 'b.name',
            'status' => 'b.status',
            'home_page' => 'b.home_page',
            'date_start' => 'b.date_start',
            'date_end' => 'b.date_end',
        ];

        $sortSql = $allowedSortColumns[$sortColumn] ?? 'b.name';
        $sortDir = $sortDir === 'DESC' ? 'DESC' : 'ASC';
        $page = max(1, $page);
        $perPage = min(self::MAX_PER_PAGE, max(1, $perPage));
        $offset = ($page - 1) * $perPage;

        $where = ['1=1'];
        $params = [];

        $name = trim((string)($filters['name'] ?? ''));
        if (strlen($name) > 255) {
            $name = substr($name, 0, 255);
        }

        if ($name !== '') {
            $where[] = 'b.name LIKE :name';
            $params[':name'] = '%' . $name . '%';
        }

        if (($filters['status'] ?? '') !== '' && ($filters['status'] === '0' || $filters['status'] === '1')) {
            $where[] = 'b.status = :status';
            $params[':status'] = (int)$filters['status'];
        }

        $whereSql = implode(' AND ', $where);

        $sqlCount = "
            SELECT COUNT(0)
            FROM pp_banners AS b
            WHERE {$whereSql}
        ";

        $stmtCount = $this->db->query($sqlCount, $params);
        $countRows = $stmtCount ? $stmtCount->fetchAll() : [];
        $total = isset($countRows[0][0]) ? (int)$countRows[0][0] : 0;

        $sql = "
            SELECT
                b.id,
                b.name,
                b.status,
                b.home_page,
                b.date_start,
                b.date_end
            FROM pp_banners AS b
            WHERE {$whereSql}
            ORDER BY {$sortSql} {$sortDir}, b.id {$sortDir}
            LIMIT {$perPage} OFFSET {$offset}
        ";

        $stmt = $this->db->query($sql, $params);
        $items = $stmt ? $stmt->fetchAll() : [];

        return [
            'items' => is_array($items) ? $items : [],
            'total' => $total,
        ];
    }

    /**
     * Zapisuje tłumaczenia banera
     */
    private function saveTranslations(int $bannerId, array $src, array $url, array $html, array $text): void
    {
        foreach ($src as $langId => $val) {
            $translationData = [
                'id_banner' => $bannerId,
                'id_lang'   => $langId,
                'src'       => $src[$langId],
                'url'       => $url[$langId],
                'html'      => $html[$langId],
                'text'      => $text[$langId],
            ];

            $existingId = $this->db->get('pp_banners_langs', 'id', ['AND' => ['banner_id' => $bannerId, 'lang_id' => $langId]]);

            if ($existingId) {
                $this->db->update('pp_banners_langs', $translationData, ['id' => $existingId]);
            } else {
                $this->db->insert('pp_banners_langs', $translationData);
            }
        }
    }
}