<?php
namespace Domain\Transport;

class TransportRepository
{
    private const MAX_PER_PAGE = 100;

    private $db;

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

    public function listForAdmin(
        array $filters = [],
        string $sortColumn = 'name',
        string $sortDir = 'ASC',
        int $page = 1,
        int $perPage = 15
    ): array {
        $allowedSortColumns = [
            'id' => 'st.id',
            'name' => 'st.name',
            'status' => 'st.status',
            'cost' => 'st.cost',
            'max_wp' => 'st.max_wp',
            'default' => 'st.default',
            'o' => 'st.o',
        ];

        $sortSql = $allowedSortColumns[$sortColumn] ?? 'st.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[] = 'st.name LIKE :name';
            $params[':name'] = '%' . $name . '%';
        }

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

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

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

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

        $sql = "
            SELECT
                st.id,
                st.name,
                st.name_visible,
                st.description,
                st.status,
                st.cost,
                st.max_wp,
                st.default,
                st.apilo_carrier_account_id,
                st.delivery_free,
                st.o
            FROM pp_shop_transports AS st
            WHERE {$whereSql}
            ORDER BY {$sortSql} {$sortDir}, st.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 = $this->normalizeTransport($item);
        }
        unset($item);

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

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

        $transport = $this->db->get('pp_shop_transports', '*', ['id' => $transportId]);

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

        $transport = $this->normalizeTransport($transport);

        $paymentMethods = $this->db->select(
            'pp_shop_transport_payment_methods',
            'id_payment_method',
            ['id_transport' => $transportId]
        );

        $transport['payment_methods'] = is_array($paymentMethods) ? $paymentMethods : [];

        return $transport;
    }

    public function save(array $data): ?int
    {
        $transportId = isset($data['id']) ? (int)$data['id'] : 0;
        $name = trim((string)($data['name'] ?? ''));
        $nameVisible = trim((string)($data['name_visible'] ?? ''));
        $description = trim((string)($data['description'] ?? ''));
        $status = $this->toSwitchValue($data['status'] ?? 0);
        $cost = isset($data['cost']) ? (float)$data['cost'] : 0.0;
        $maxWp = isset($data['max_wp']) && $data['max_wp'] !== '' ? (int)$data['max_wp'] : null;
        $default = $this->toSwitchValue($data['default'] ?? 0);
        $apiloCarrierAccountId = isset($data['apilo_carrier_account_id']) && $data['apilo_carrier_account_id'] !== ''
            ? (int)$data['apilo_carrier_account_id']
            : null;
        $deliveryFree = $this->toSwitchValue($data['delivery_free'] ?? 0);
        $paymentMethods = $data['payment_methods'] ?? [];

        if ($default === 1) {
            $this->db->update('pp_shop_transports', ['default' => 0]);
        }

        $transportData = [
            'name' => $name,
            'name_visible' => $nameVisible,
            'description' => $description,
            'status' => $status,
            'default' => $default,
            'cost' => $cost,
            'max_wp' => $maxWp,
            'apilo_carrier_account_id' => $apiloCarrierAccountId,
            'delivery_free' => $deliveryFree,
        ];

        if (!$transportId) {
            $this->db->insert('pp_shop_transports', $transportData);
            $id = $this->db->id();

            if ($id) {
                $this->savePaymentMethodLinks((int)$id, $paymentMethods);
                return (int)$id;
            }

            return null;
        } else {
            $this->db->update('pp_shop_transports', $transportData, ['id' => $transportId]);
            $this->db->delete('pp_shop_transport_payment_methods', ['id_transport' => $transportId]);
            $this->savePaymentMethodLinks($transportId, $paymentMethods);
            return $transportId;
        }
    }

    public function allActive(): array
    {
        $transports = $this->db->select(
            'pp_shop_transports',
            '*',
            [
                'status' => 1,
                'ORDER' => ['o' => 'ASC'],
            ]
        );

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

        foreach ($transports as &$transport) {
            $transport = $this->normalizeTransport($transport);
        }
        unset($transport);

        return $transports;
    }

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

        $transport = $this->db->get(
            'pp_shop_transports',
            '*',
            ['AND' => ['id' => $transportId, 'status' => 1]]
        );

        if (!$transport) {
            return null;
        }

        return $this->normalizeTransport($transport);
    }

    public function getApiloCarrierAccountId(int $transportId): ?int
    {
        if ($transportId <= 0) {
            return null;
        }

        $result = $this->db->get(
            'pp_shop_transports',
            'apilo_carrier_account_id',
            ['id' => $transportId]
        );

        return $result !== null ? (int)$result : null;
    }

    public function getTransportCost(int $transportId): ?float
    {
        if ($transportId <= 0) {
            return null;
        }

        $result = $this->db->get(
            'pp_shop_transports',
            'cost',
            ['AND' => ['id' => $transportId, 'status' => 1]]
        );

        return $result !== null ? (float)$result : null;
    }

    public function lowestTransportPrice(int $wp): ?float
    {
        $result = $this->db->get(
            'pp_shop_transports',
            'cost',
            [
                'AND' => [
                    'status' => 1,
                    'id' => [2, 4, 6, 8, 9],
                    'max_wp[>=]' => $wp
                ],
                'ORDER' => ['cost' => 'ASC']
            ]
        );

        return $result !== null ? (float)$result : null;
    }

    public function allForAdmin(): array
    {
        $transports = $this->db->select(
            'pp_shop_transports',
            '*',
            ['ORDER' => ['o' => 'ASC']]
        );

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

        foreach ($transports as &$transport) {
            $transport = $this->normalizeTransport($transport);
        }
        unset($transport);

        return $transports;
    }

    // =========================================================================
    // Frontend methods (migrated from front\factory\ShopTransport)
    // =========================================================================

    /**
     * Lista metod transportu dla koszyka (z filtrowaniem wagi + darmowa dostawa)
     */
    public function transportMethodsFront( $basket, $coupon ): array
    {
        global $settings;

        $cacheHandler = new \Shared\Cache\CacheHandler();
        $cacheKey = 'transport_methods_front';
        $cached = $cacheHandler->get( $cacheKey );

        if ( $cached )
        {
            $transports_tmp = unserialize( $cached );
        }
        else
        {
            $transports_tmp = $this->allActive();
            $cacheHandler->set( $cacheKey, $transports_tmp );
        }

        $wp_summary = \Domain\Basket\BasketCalculator::summaryWp( $basket );

        $transports = [];
        foreach ( $transports_tmp as $tr )
        {
            if ( $tr['max_wp'] == null )
                $transports[] = $tr;
            elseif ( $tr['max_wp'] != null and $wp_summary <= $tr['max_wp'] )
                $transports[] = $tr;
        }

        $products_summary = (float)\Domain\Basket\BasketCalculator::summaryPrice( $basket, $coupon );

        if ( \Shared\Helpers\Helpers::normalize_decimal( $products_summary ) >= \Shared\Helpers\Helpers::normalize_decimal( $settings['free_delivery'] ) )
        {
            for ( $i = 0; $i < count( $transports ); $i++ ) {
                if ( $transports[$i]['delivery_free'] == 1 ) {
                    $transports[$i]['cost'] = 0.00;
                }
            }
        }

        // Ukryj transporty, dla których nie ma żadnej dostępnej formy płatności
        $paymentMethodRepo = new \Domain\PaymentMethod\PaymentMethodRepository( $this->db );
        $filtered = [];

        foreach ( $transports as $tr )
        {
            $paymentMethods = $paymentMethodRepo->paymentMethodsByTransport( $tr['id'] );
            $order_total = $products_summary + (float)$tr['cost'];
            $has_available_pm = false;

            foreach ( $paymentMethods as $pm )
            {
                $min = isset( $pm['min_order_amount'] ) ? (float)$pm['min_order_amount'] : null;
                $max = isset( $pm['max_order_amount'] ) ? (float)$pm['max_order_amount'] : null;
                $available = true;

                if ( $min !== null && $min > 0 && $order_total < $min ) $available = false;
                if ( $max !== null && $max > 0 && $order_total > $max ) $available = false;

                if ( $available )
                {
                    $has_available_pm = true;
                    break;
                }
            }

            if ( $has_available_pm )
            {
                $filtered[] = $tr;
            }
        }

        return $filtered;
    }

    /**
     * Koszt transportu z cache
     */
    public function transportCostCached( $transportId )
    {
        $cacheHandler = new \Shared\Cache\CacheHandler();
        $cacheKey = 'transport_cost_' . $transportId;
        $cached = $cacheHandler->get( $cacheKey );

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

        $cost = $this->getTransportCost( (int)$transportId );
        $cacheHandler->set( $cacheKey, $cost );

        return $cost;
    }

    /**
     * Aktywny transport z cache
     */
    public function findActiveByIdCached( $transportId )
    {
        $cacheHandler = new \Shared\Cache\CacheHandler();
        $cacheKey = 'transport' . $transportId;
        $cached = $cacheHandler->get( $cacheKey );

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

        $transport = $this->findActiveById( (int)$transportId );
        $cacheHandler->set( $cacheKey, $transport );

        return $transport;
    }

    /**
     * Transporty powiązane z metodą płatności
     */
    public function forPaymentMethod( int $paymentMethodId ): array
    {
        if ( $paymentMethodId <= 0 )
        {
            return [];
        }

        $transportIds = $this->db->select(
            'pp_shop_transport_payment_methods',
            'id_transport',
            ['id_payment_method' => $paymentMethodId]
        );

        if ( !is_array( $transportIds ) || empty( $transportIds ) )
        {
            return [];
        }

        $transports = $this->db->select(
            'pp_shop_transports',
            '*',
            ['AND' => ['id' => $transportIds, 'status' => 1], 'ORDER' => ['o' => 'ASC']]
        );

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

        foreach ( $transports as &$transport )
        {
            $transport = $this->normalizeTransport( $transport );
        }
        unset( $transport );

        return $transports;
    }

    private function savePaymentMethodLinks(int $transportId, $paymentMethods): void
    {
        if (is_array($paymentMethods)) {
            foreach ($paymentMethods as $paymentMethodId) {
                $this->db->insert('pp_shop_transport_payment_methods', [
                    'id_payment_method' => (int)$paymentMethodId,
                    'id_transport' => $transportId,
                ]);
            }
        } elseif ($paymentMethods) {
            $this->db->insert('pp_shop_transport_payment_methods', [
                'id_payment_method' => (int)$paymentMethods,
                'id_transport' => $transportId,
            ]);
        }
    }

    private function normalizeTransport(array $transport): array
    {
        $transport['id'] = isset($transport['id']) ? (int)$transport['id'] : 0;
        $transport['status'] = $this->toSwitchValue($transport['status'] ?? 0);
        $transport['default'] = $this->toSwitchValue($transport['default'] ?? 0);
        $transport['delivery_free'] = $this->toSwitchValue($transport['delivery_free'] ?? 0);
        $transport['cost'] = isset($transport['cost']) ? (float)$transport['cost'] : 0.0;
        $transport['max_wp'] = isset($transport['max_wp']) && $transport['max_wp'] !== null
            ? (int)$transport['max_wp']
            : null;
        $transport['apilo_carrier_account_id'] = isset($transport['apilo_carrier_account_id']) && $transport['apilo_carrier_account_id'] !== null
            ? (int)$transport['apilo_carrier_account_id']
            : null;
        $transport['o'] = isset($transport['o']) ? (int)$transport['o'] : 0;

        return $transport;
    }

    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;
    }
}