<?php
namespace Domain\PaymentMethod;

class PaymentMethodRepository
{
    private const MAX_PER_PAGE = 100;

    private $db;

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

    /**
     * @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 {
        $allowedSortColumns = [
            'id' => 'spm.id',
            'name' => 'spm.name',
            'status' => 'spm.status',
            'apilo_payment_type_id' => 'spm.apilo_payment_type_id',
        ];

        $sortSql = $allowedSortColumns[$sortColumn] ?? 'spm.name';
        $sortDir = strtoupper(trim($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 ($name !== '') {
            if (strlen($name) > 255) {
                $name = substr($name, 0, 255);
            }
            $where[] = 'spm.name LIKE :name';
            $params[':name'] = '%' . $name . '%';
        }

        $status = trim((string)($filters['status'] ?? ''));
        if ($status === '0' || $status === '1') {
            $where[] = 'spm.status = :status';
            $params[':status'] = (int)$status;
        }

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

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

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

        $sql = "
            SELECT
                spm.id,
                spm.name,
                spm.description,
                spm.status,
                spm.apilo_payment_type_id
            FROM pp_shop_payment_methods AS spm
            WHERE {$whereSql}
            ORDER BY {$sortSql} {$sortDir}, spm.id ASC
            LIMIT {$perPage} OFFSET {$offset}
        ";

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

        if (!is_array($items)) {
            $items = [];
        }

        foreach ($items as &$item) {
            $item = $this->normalizePaymentMethod($item);
        }
        unset($item);

        return [
            'items' => $items,
            'total' => $total,
        ];
    }

    public function find(int $paymentMethodId): ?array
    {
        if ($paymentMethodId <= 0) {
            return null;
        }

        $paymentMethod = $this->db->get('pp_shop_payment_methods', '*', ['id' => $paymentMethodId]);
        if (!is_array($paymentMethod)) {
            return null;
        }

        return $this->normalizePaymentMethod($paymentMethod);
    }

    public function save(int $paymentMethodId, array $data): ?int
    {
        if ($paymentMethodId <= 0) {
            return null;
        }

        $row = [
            'description' => trim((string)($data['description'] ?? '')),
            'status' => $this->toSwitchValue($data['status'] ?? 0),
            'apilo_payment_type_id' => $this->normalizeApiloPaymentTypeId($data['apilo_payment_type_id'] ?? null),
            'min_order_amount' => $this->normalizeDecimalOrNull($data['min_order_amount'] ?? null),
            'max_order_amount' => $this->normalizeDecimalOrNull($data['max_order_amount'] ?? null),
            'is_cod' => (int)(!empty($data['is_cod']) ? 1 : 0),
        ];

        $this->db->update('pp_shop_payment_methods', $row, ['id' => $paymentMethodId]);

        $cacheHandler = new \Shared\Cache\CacheHandler();
        $cacheHandler->deletePattern('payment_method*');
        $cacheHandler->deletePattern('payment_methods*');

        return $paymentMethodId;
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    public function allActive(): array
    {
        $rows = $this->db->select('pp_shop_payment_methods', '*', [
            'status' => 1,
            'ORDER' => ['id' => 'ASC'],
        ]);

        if (!is_array($rows)) {
            return [];
        }

        $result = [];
        foreach ($rows as $row) {
            if (is_array($row)) {
                $result[] = $this->normalizePaymentMethod($row);
            }
        }

        return $result;
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    public function allForAdmin(): array
    {
        $rows = $this->db->select('pp_shop_payment_methods', '*', [
            'ORDER' => ['name' => 'ASC'],
        ]);

        if (!is_array($rows)) {
            return [];
        }

        $result = [];
        foreach ($rows as $row) {
            if (is_array($row)) {
                $result[] = $this->normalizePaymentMethod($row);
            }
        }

        return $result;
    }

    public function findActiveById(int $paymentMethodId): ?array
    {
        if ($paymentMethodId <= 0) {
            return null;
        }

        $paymentMethod = $this->db->get('pp_shop_payment_methods', '*', [
            'AND' => [
                'id' => $paymentMethodId,
                'status' => 1,
            ],
        ]);

        if (!is_array($paymentMethod)) {
            return null;
        }

        return $this->normalizePaymentMethod($paymentMethod);
    }

    public function isActive(int $paymentMethodId): int
    {
        if ($paymentMethodId <= 0) {
            return 0;
        }

        $status = $this->db->get('pp_shop_payment_methods', 'status', ['id' => $paymentMethodId]);
        return $this->toSwitchValue($status);
    }

    /**
     * @return int|string|null
     */
    public function getApiloPaymentTypeId(int $paymentMethodId)
    {
        if ($paymentMethodId <= 0) {
            return null;
        }

        $value = $this->db->get('pp_shop_payment_methods', 'apilo_payment_type_id', ['id' => $paymentMethodId]);
        return $this->normalizeApiloPaymentTypeId($value);
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    public function forTransport(int $transportMethodId): array
    {
        if ($transportMethodId <= 0) {
            return [];
        }

        $sql = "
            SELECT
                spm.id,
                spm.name,
                spm.description,
                spm.status,
                spm.apilo_payment_type_id,
                spm.min_order_amount,
                spm.max_order_amount,
                spm.is_cod
            FROM pp_shop_payment_methods AS spm
            INNER JOIN pp_shop_transport_payment_methods AS stpm
                ON stpm.id_payment_method = spm.id
            WHERE spm.status = 1
                AND stpm.id_transport = :transport_id
        ";

        $stmt = $this->db->query($sql, [':transport_id' => $transportMethodId]);
        $rows = $stmt ? $stmt->fetchAll() : [];

        if (!is_array($rows)) {
            return [];
        }

        $result = [];
        foreach ($rows as $row) {
            if (is_array($row)) {
                $result[] = $this->normalizePaymentMethod($row);
            }
        }

        return $result;
    }

    /**
     * Metody platnosci dla danego transportu — z Redis cache (frontend).
     *
     * @return array<int, array<string, mixed>>
     */
    public function paymentMethodsByTransport(int $transportMethodId): array
    {
        $cacheHandler = new \Shared\Cache\CacheHandler();
        $cacheKey = 'payment_methods_by_transport' . $transportMethodId;
        $cached = $cacheHandler->get($cacheKey);

        if ($cached) {
            return unserialize($cached);
        }

        $result = $this->forTransport($transportMethodId);
        $cacheHandler->set($cacheKey, $result);

        return $result;
    }

    /**
     * Pojedyncza aktywna metoda platnosci — z Redis cache (frontend).
     */
    public function paymentMethodCached(int $paymentMethodId): ?array
    {
        $cacheHandler = new \Shared\Cache\CacheHandler();
        $cacheKey = 'payment_method' . $paymentMethodId;
        $cached = $cacheHandler->get($cacheKey);

        if ($cached) {
            return unserialize($cached);
        }

        $result = $this->findActiveById($paymentMethodId);
        $cacheHandler->set($cacheKey, $result);

        return $result;
    }

    /**
     * Wszystkie aktywne metody platnosci — z Redis cache (frontend).
     *
     * @return array<int, array<string, mixed>>
     */
    public function paymentMethodsCached(): array
    {
        $cacheHandler = new \Shared\Cache\CacheHandler();
        $cacheKey = 'payment_methods';
        $cached = $cacheHandler->get($cacheKey);

        if ($cached) {
            return unserialize($cached);
        }

        $result = $this->allActive();
        $cacheHandler->set($cacheKey, $result);

        return $result;
    }

    private function normalizePaymentMethod(array $row): array
    {
        $row['id'] = (int)($row['id'] ?? 0);
        $row['name'] = trim((string)($row['name'] ?? ''));
        $row['description'] = (string)($row['description'] ?? '');
        $row['status'] = $this->toSwitchValue($row['status'] ?? 0);
        $row['apilo_payment_type_id'] = $this->normalizeApiloPaymentTypeId($row['apilo_payment_type_id'] ?? null);
        $row['min_order_amount'] = $this->normalizeDecimalOrNull($row['min_order_amount'] ?? null);
        $row['max_order_amount'] = $this->normalizeDecimalOrNull($row['max_order_amount'] ?? null);
        $row['is_cod'] = (int)($row['is_cod'] ?? 0);

        return $row;
    }

    /**
     * @return int|string|null
     */
    private function normalizeApiloPaymentTypeId($value)
    {
        if ($value === null || $value === false) {
            return null;
        }

        $text = trim((string)$value);
        if ($text === '') {
            return null;
        }

        if (preg_match('/^-?\d+$/', $text) === 1) {
            return (int)$text;
        }

        return $text;
    }

    /**
     * @return float|null
     */
    private function normalizeDecimalOrNull($value)
    {
        if ($value === null || $value === false) {
            return null;
        }

        $text = trim((string)$value);
        if ($text === '') {
            return null;
        }

        return (float)$text;
    }

    private function toSwitchValue($value): int
    {
        if (is_bool($value)) {
            return $value ? 1 : 0;
        }

        if (is_numeric($value)) {
            return ((int)$value) === 1 ? 1 : 0;
        }

        if (is_string($value)) {
            $normalized = strtolower(trim($value));
            return in_array($normalized, ['1', 'on', 'true', 'yes'], true) ? 1 : 0;
        }

        return 0;
    }
}