<?php

namespace App\Services;

use Acme\Dhl\Models\DhlShipment;
use App\Models\ShoppingOrder;
use App\Http\Controllers\SettingController;
use App\Jobs\CreateShipmentJob;
use App\Jobs\CancelShipmentJob;
use App\Services\DhlDataHelper;
use Illuminate\Support\Facades\Log;
use Exception;

/**
 * DHL Shipment Service
 * 
 * Handles both synchronous and asynchronous shipment creation
 * based on configuration settings
 */
class DhlShipmentService
{
    /**
     * Create a DHL shipment (sync or async based on config)
     *
     * @param ShoppingOrder $order
     * @param float $weight
     * @param array $options
     * @return array
     */
    public function createShipment(ShoppingOrder $order, float $weight = 1.0, array $options = []): array
    {
        // Get DHL configuration
        $settingController = new SettingController();
        $dhlConfig = $settingController->getDhlConfig();
        \Log::info('dhlConfig', $dhlConfig);
        // Check if queue should be used
        $useQueue = $dhlConfig['use_queue'] ?? false;

        if ($useQueue) {
            return $this->createShipmentAsync($order, $weight, $options, $dhlConfig);
        } else {
            return $this->createShipmentSync($order, $weight, $options, $dhlConfig);
        }
    }

    /**
     * Create shipment asynchronously using queue
     *
     * @param ShoppingOrder $order
     * @param float $weight
     * @param array $options
     * @param array $dhlConfig
     * @return array
     */
    private function createShipmentAsync(ShoppingOrder $order, float $weight, array $options, array $dhlConfig): array
    {
        try {
            // Dispatch job with pre-loaded config
            CreateShipmentJob::dispatch($order, $weight, $options, $dhlConfig);

            Log::info('[DHL Service] Shipment creation dispatched to queue', [
                'order_id' => $order->id,
                'weight' => $weight
            ]);

            return [
                'success' => true,
                'message' => 'Sendung wird erstellt. Sie erhalten eine Benachrichtigung, sobald das Versandlabel verfügbar ist.',
                'queued' => true,
                'order_id' => $order->id
            ];
        } catch (Exception $e) {
            Log::error('[DHL Service] Failed to dispatch shipment creation', [
                'error' => $e->getMessage(),
                'order_id' => $order->id,
            ]);

            return [
                'success' => false,
                'message' => 'Fehler beim Einreihen der Sendungserstellung: ' . $e->getMessage(),
                'queued' => false
            ];
        }
    }

    /**
     * Create shipment synchronously
     *
     * @param ShoppingOrder $order
     * @param float $weight
     * @param array $options
     * @param array $dhlConfig
     * @return array
     */
    private function createShipmentSync(ShoppingOrder $order, float $weight, array $options, array $dhlConfig): array
    {
        try {
            Log::info('[DHL Service] Creating shipment synchronously', [
                'order_id' => $order->id,
                'weight' => $weight
            ]);

            // Create DHL client directly with correct base URL
            $dhlClient = new \Acme\Dhl\Support\DhlClient(
                $dhlConfig['base_url'],
                $dhlConfig['api_key'],
                $dhlConfig['username'],
                $dhlConfig['password']
            );

            $shippingService = new \Acme\Dhl\Services\ShippingService($dhlClient);

            // Prepare order data using helper
            $orderData = DhlDataHelper::prepareOrderData($order, $weight, $options, $dhlConfig);
            Log::info('orderData', $orderData);
            // Create the shipment directly
            $result = $shippingService->createLabel($orderData);

            Log::info('[DHL Service] Shipment created successfully (sync)', [
                'order_id' => $order->id,
                'shipment_number' => $result['shipmentNumber'] ?? 'N/A',
                'label_path' => $result['labelPath'] ?? 'N/A',
            ]);

            return [
                'success' => true,
                'message' => 'Versandlabel erfolgreich erstellt!',
                'queued' => false,
                'order_id' => $order->id,
                'shipment_number' => $result['shipmentNumber'] ?? null,
                'tracking_number' => $result['trackingNumber'] ?? null,
                'label_path' => $result['labelPath'] ?? null,
                'label_url' => $result['labelUrl'] ?? null,
            ];
        } catch (Exception $e) {
            Log::error('[DHL Service] Shipment creation failed (sync)', [
                'order_id' => $order->id,
                'error' => $e->getMessage()
            ]);

            return [
                'success' => false,
                'message' => 'Fehler beim Erstellen des Versandlabels: ' . $e->getMessage(),
                'queued' => false,
                'order_id' => $order->id
            ];
        }
    }

    /**
     * Cancel a DHL shipment (sync or async based on config)
     *
     * @param DhlShipment $shipment
     * @param array $options
     * @return array
     */
    public function cancelShipment(DhlShipment $shipment, array $options = []): array
    {
        // Get DHL configuration
        $settingController = new SettingController();
        $dhlConfig = $settingController->getDhlConfig();

        // Check if queue should be used
        $useQueue = $dhlConfig['use_queue'] ?? false;

        if ($useQueue) {
            return $this->cancelShipmentAsync($shipment, $options, $dhlConfig);
        } else {
            return $this->cancelShipmentSync($shipment, $options, $dhlConfig);
        }
    }

    /**
     * Cancel shipment asynchronously using queue
     *
     * @param DhlShipment $shipment
     * @param array $options
     * @param array $dhlConfig
     * @return array
     */
    private function cancelShipmentAsync(DhlShipment $shipment, array $options, array $dhlConfig): array
    {
        try {
            // Dispatch job
            CancelShipmentJob::dispatch($shipment, $options);

            Log::info('[DHL Service] Shipment cancellation dispatched to queue', [
                'shipment_id' => $shipment->id,
                'dhl_shipment_no' => $shipment->dhl_shipment_no
            ]);

            return [
                'success' => true,
                'message' => 'Sendung wird storniert...',
                'queued' => true,
                'shipment_id' => $shipment->id
            ];
        } catch (Exception $e) {
            Log::error('[DHL Service] Failed to dispatch shipment cancellation', [
                'error' => $e->getMessage(),
                'shipment_id' => $shipment->id,
            ]);

            return [
                'success' => false,
                'message' => 'Fehler beim Einreihen der Stornierung: ' . $e->getMessage(),
                'queued' => false
            ];
        }
    }

    /**
     * Cancel shipment synchronously
     *
     * @param DhlShipment $shipment
     * @param array $options
     * @param array $dhlConfig
     * @return array
     */
    private function cancelShipmentSync(DhlShipment $shipment, array $options, array $dhlConfig): array
    {
        try {
            // Validate shipment has DHL number
            if (empty($shipment->dhl_shipment_no)) {
                return [
                    'success' => false,
                    'message' => 'Sendung hat keine DHL-Sendungsnummer und kann nicht storniert werden.',
                    'queued' => false,
                    'shipment_id' => $shipment->id
                ];
            }

            // Validate shipment can be cancelled
            if (! $shipment->canCancel()) {
                return [
                    'success' => false,
                    'message' => 'Sendung kann im aktuellen Status "' . $shipment->status . '" nicht storniert werden. Nur Status "created" oder "pending" sind stornierbar.',
                    'queued' => false,
                    'shipment_id' => $shipment->id
                ];
            }

            Log::info('[DHL Service] Cancelling shipment synchronously', [
                'shipment_id' => $shipment->id,
                'dhl_shipment_no' => $shipment->dhl_shipment_no,
                'status' => $shipment->status,
                'base_url' => $dhlConfig['base_url']
            ]);

            // Create DHL client
            $dhlClient = new \Acme\Dhl\Support\DhlClient(
                $dhlConfig['base_url'],
                $dhlConfig['api_key'],
                $dhlConfig['username'],
                $dhlConfig['password']
            );

            $shippingService = new \Acme\Dhl\Services\ShippingService($dhlClient);

            // Cancel the shipment directly
            $success = $shippingService->cancelLabel($shipment->dhl_shipment_no);

            if ($success) {
                Log::info('[DHL Service] Shipment cancelled successfully (sync)', [
                    'shipment_id' => $shipment->id,
                    'dhl_shipment_no' => $shipment->dhl_shipment_no
                ]);

                return [
                    'success' => true,
                    'message' => 'Sendung wurde erfolgreich storniert!',
                    'queued' => false,
                    'shipment_id' => $shipment->id
                ];
            } else {
                throw new Exception('Cancellation returned false');
            }
        } catch (\InvalidArgumentException $e) {
            Log::warning('[DHL Service] Shipment cancellation validation failed', [
                'shipment_id' => $shipment->id,
                'error' => $e->getMessage()
            ]);

            return [
                'success' => false,
                'message' => $e->getMessage(),
                'queued' => false,
                'shipment_id' => $shipment->id
            ];
        } catch (Exception $e) {
            Log::error('[DHL Service] Shipment cancellation failed (sync)', [
                'shipment_id' => $shipment->id,
                'dhl_shipment_no' => $shipment->dhl_shipment_no,
                'status' => $shipment->status,
                'error' => $e->getMessage(),
                'error_trace' => $e->getTraceAsString()
            ]);

            // Check if it's an API authentication/resource error
            $errorMessage = $e->getMessage();
            if (strpos($errorMessage, 'RF-UndefinedResource') !== false) {
                return [
                    'success' => false,
                    'message' => 'Die Sendung konnte bei DHL nicht gefunden werden. Mögliche Ursachen: Sendung wurde bereits storniert, ist zu alt, oder wurde in einem anderen Modus (Sandbox/Production) erstellt.',
                    'queued' => false,
                    'shipment_id' => $shipment->id,
                    'technical_error' => $errorMessage
                ];
            }

            return [
                'success' => false,
                'message' => 'Fehler beim Stornieren der Sendung: ' . $errorMessage,
                'queued' => false,
                'shipment_id' => $shipment->id
            ];
        }
    }
}