<?php

namespace App\Services;

use Acme\Dhl\Models\DhlShipment;
use App\Http\Controllers\SettingController;
use App\Jobs\TrackShipmentJob;
use Exception;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

/**
 * DHL Tracking Service
 *
 * Handles DHL tracking using both Unified Tracking API and Parcel DE Tracking API
 * with support for synchronous and asynchronous tracking updates
 */
class DhlTrackingService
{
    private string $apiKey;

    private string $apiSecret;

    private bool $isSandbox;

    public function __construct()
    {
        $settingController = new SettingController;
        $dhlConfig = $settingController->getDhlConfig();

        $this->apiKey = $dhlConfig['api_key'] ?? config('dhl.api_key');
        $this->apiSecret = $dhlConfig['api_secret'] ?? config('dhl.legacy.api_secret');
        $this->isSandbox = ($dhlConfig['sandbox'] ?? config('dhl.legacy.sandbox', true));
    }

    /**
     * Track shipment using DHL Unified Tracking API (recommended for international)
     */
    public function trackShipment(string $trackingNumber, array $options = []): array
    {
        try {
            Log::info('[DHL Tracking Service] Tracking shipment with Unified API', [
                'tracking_number' => $trackingNumber,
                'is_sandbox' => $this->isSandbox,
            ]);

            $response = Http::withHeaders([
                'DHL-API-Key' => $this->apiKey,
                'Accept' => 'application/json',
            ])
                ->withOptions([
                    'verify' => config('dhl.ssl.verify_peer', true),
                    'http_errors' => false,
                    'curl' => [
                        CURLOPT_SSL_VERIFYPEER => config('dhl.ssl.verify_peer', true),
                        CURLOPT_SSL_VERIFYHOST => config('dhl.ssl.verify_host', true) ? 2 : 0,
                        CURLOPT_SSLVERSION => $this->getSslVersion(),
                        CURLOPT_FOLLOWLOCATION => true,
                        CURLOPT_MAXREDIRS => 5,
                        CURLOPT_CONNECTTIMEOUT => config('dhl.ssl.connect_timeout', 10),
                        CURLOPT_TIMEOUT => config('dhl.ssl.timeout', 30),
                        CURLOPT_USERAGENT => 'acme-laravel-dhl/1.0',
                    ]
                ])
                ->get('https://api.dhl.com/track/shipments', [
                    'trackingNumber' => $trackingNumber,
                    'service' => 'express,parcel',
                    'requesterCountryCode' => 'DE',
                    'originCountryCode' => 'DE',
                    'language' => 'de',
                ]);

            if ($response->successful()) {
                $data = $response->json();

                if (isset($data['shipments']) && count($data['shipments']) > 0) {
                    $shipment = $data['shipments'][0];

                    return [
                        'success' => true,
                        'tracking_number' => $shipment['id'],
                        'status' => $shipment['status']['statusCode'] ?? 'unknown',
                        'status_text' => $shipment['status']['status'] ?? 'Unbekannt',
                        'description' => $shipment['status']['description'] ?? '',
                        'last_update' => $shipment['status']['timestamp'] ?? null,
                        'origin' => $shipment['origin']['address']['addressLocality'] ?? null,
                        'destination' => $shipment['destination']['address']['addressLocality'] ?? null,
                        'events' => $shipment['events'] ?? [],
                        'api_used' => 'unified',
                    ];
                }
            }

            // If Unified API fails, try Parcel DE API
            return $this->trackShipmentDE($trackingNumber, $options);
        } catch (Exception $e) {
            Log::error('[DHL Tracking Service] Unified API failed', [
                'tracking_number' => $trackingNumber,
                'error' => $e->getMessage(),
            ]);

            // Fallback to Parcel DE API
            return $this->trackShipmentDE($trackingNumber, $options);
        }
    }

    /**
     * Track shipment using DHL Parcel DE Tracking API (optimized for Germany)
     */
    public function trackShipmentDE(string $trackingNumber, array $options = []): array
    {
        try {
            Log::info('[DHL Tracking Service] Tracking shipment with Parcel DE API', [
                'tracking_number' => $trackingNumber,
                'is_sandbox' => $this->isSandbox,
            ]);

            $response = Http::withBasicAuth($this->apiKey, $this->apiSecret)
                ->withHeaders([
                    'Accept' => 'application/json',
                    'dhl-api-key' => $this->apiKey,
                ])
                ->withOptions([
                    'verify' => config('dhl.ssl.verify_peer', true),
                    'http_errors' => false,
                    'curl' => [
                        CURLOPT_SSL_VERIFYPEER => config('dhl.ssl.verify_peer', true),
                        CURLOPT_SSL_VERIFYHOST => config('dhl.ssl.verify_host', true) ? 2 : 0,
                        CURLOPT_SSLVERSION => $this->getSslVersion(),
                        CURLOPT_FOLLOWLOCATION => true,
                        CURLOPT_MAXREDIRS => 5,
                        CURLOPT_CONNECTTIMEOUT => config('dhl.ssl.connect_timeout', 10),
                        CURLOPT_TIMEOUT => config('dhl.ssl.timeout', 30),
                        CURLOPT_USERAGENT => 'acme-laravel-dhl/1.0',
                    ]
                ])
                ->get('https://api.dhl.com/parcel/de/tracking/v1/shipments', [
                    'trackingNumber' => $trackingNumber,
                    'language' => 'de',
                ]);

            if ($response->successful()) {
                $data = $response->json();

                if (isset($data['shipments']) && count($data['shipments']) > 0) {
                    $shipment = $data['shipments'][0];

                    return [
                        'success' => true,
                        'tracking_number' => $shipment['id'],
                        'status' => $shipment['status']['statusCode'] ?? 'unknown',
                        'status_text' => $shipment['status']['description'] ?? 'Unbekannt',
                        'description' => $shipment['status']['description'] ?? '',
                        'last_update' => $shipment['status']['timestamp'] ?? null,
                        'events' => $shipment['events'] ?? [],
                        'api_used' => 'parcel_de',
                    ];
                }
            }

            return [
                'success' => false,
                'message' => 'Sendung nicht gefunden oder noch nicht im System erfasst.',
                'tracking_number' => $trackingNumber,
                'api_used' => 'parcel_de',
            ];
        } catch (Exception $e) {
            Log::error('[DHL Tracking Service] Parcel DE API failed', [
                'tracking_number' => $trackingNumber,
                'error' => $e->getMessage(),
            ]);

            return [
                'success' => false,
                'message' => 'Fehler beim Abrufen der Tracking-Informationen: ' . $e->getMessage(),
                'tracking_number' => $trackingNumber,
                'api_used' => 'parcel_de',
            ];
        }
    }

    /**
     * Track multiple shipments at once (up to 10 for Unified API)
     */
    public function trackMultipleShipments(array $trackingNumbers): array
    {
        if (count($trackingNumbers) > 10) {
            return [
                'success' => false,
                'message' => 'Maximal 10 Sendungen können gleichzeitig getrackt werden.',
            ];
        }

        try {
            $response = Http::withHeaders([
                'DHL-API-Key' => $this->apiKey,
                'Accept' => 'application/json',
            ])
                ->withOptions([
                    'verify' => config('dhl.ssl.verify_peer', true),
                    'http_errors' => false,
                    'curl' => [
                        CURLOPT_SSL_VERIFYPEER => config('dhl.ssl.verify_peer', true),
                        CURLOPT_SSL_VERIFYHOST => config('dhl.ssl.verify_host', true) ? 2 : 0,
                        CURLOPT_SSLVERSION => $this->getSslVersion(),
                        CURLOPT_FOLLOWLOCATION => true,
                        CURLOPT_MAXREDIRS => 5,
                        CURLOPT_CONNECTTIMEOUT => config('dhl.ssl.connect_timeout', 10),
                        CURLOPT_TIMEOUT => config('dhl.ssl.timeout', 30),
                        CURLOPT_USERAGENT => 'acme-laravel-dhl/1.0',
                    ]
                ])
                ->get('https://api.dhl.com/track/shipments', [
                    'trackingNumber' => implode(',', $trackingNumbers),
                    'service' => 'parcel',
                    'requesterCountryCode' => 'DE',
                    'language' => 'de',
                ]);

            if ($response->successful()) {
                $data = $response->json();
                $results = [];

                foreach ($data['shipments'] ?? [] as $shipment) {
                    $results[] = [
                        'tracking_number' => $shipment['id'],
                        'status' => $shipment['status']['statusCode'] ?? 'unknown',
                        'status_text' => $shipment['status']['status'] ?? 'Unbekannt',
                        'last_update' => $shipment['status']['timestamp'] ?? null,
                        'events' => $shipment['events'] ?? [],
                    ];
                }

                return [
                    'success' => true,
                    'shipments' => $results,
                    'api_used' => 'unified',
                ];
            }

            return [
                'success' => false,
                'message' => 'Fehler beim Abrufen der Tracking-Informationen.',
            ];
        } catch (Exception $e) {
            Log::error('[DHL Tracking Service] Multiple tracking failed', [
                'tracking_numbers' => $trackingNumbers,
                'error' => $e->getMessage(),
            ]);

            return [
                'success' => false,
                'message' => 'Fehler beim Abrufen der Tracking-Informationen: ' . $e->getMessage(),
            ];
        }
    }

    /**
     * Update tracking for a DHL shipment (sync or async based on config)
     */
    public function updateTracking(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 $this->updateTrackingAsync($shipment, $options, $dhlConfig);
        } else {
            return $this->updateTrackingSync($shipment, $options, $dhlConfig);
        }
    }

    /**
     * Update tracking asynchronously using queue
     */
    private function updateTrackingAsync(DhlShipment $shipment, array $options, array $dhlConfig): array
    {
        try {
            // Dispatch job with pre-loaded config
            TrackShipmentJob::dispatch($shipment, $options);

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

            return [
                'success' => true,
                'message' => 'Tracking-Update wird verarbeitet. Sie erhalten eine Benachrichtigung, sobald die Informationen aktualisiert sind.',
                'queued' => true,
                'shipment_id' => $shipment->id,
            ];
        } catch (Exception $e) {
            Log::error('[DHL Tracking Service] Failed to dispatch tracking update', [
                'error' => $e->getMessage(),
                'shipment_id' => $shipment->id,
            ]);

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

    /**
     * Update tracking synchronously using new DHL APIs
     */
    private function updateTrackingSync(DhlShipment $shipment, array $options, array $dhlConfig): array
    {
        try {
            Log::info('[DHL Tracking Service] Updating tracking synchronously', [
                'shipment_id' => $shipment->id,
                'dhl_shipment_no' => $shipment->dhl_shipment_no,
            ]);

            // Check if shipment has tracking number
            if (! $shipment->dhl_shipment_no) {
                return [
                    'success' => false,
                    'message' => 'Keine DHL-Sendungsnummer verfügbar für Tracking.',
                    'queued' => false,
                    'shipment_id' => $shipment->id,
                ];
            }

            // Use new tracking API
            $result = $this->trackShipment($shipment->dhl_shipment_no);

            if ($result['success']) {
                // Update shipment with tracking data
                $shipment->update([
                    'status' => $this->mapDhlStatusToInternal($result['status']),
                    'tracking_status' => $result['status_text'],
                    'last_tracked_at' => now(),
                ]);

                Log::info('[DHL Tracking Service] Tracking updated successfully (sync)', [
                    'shipment_id' => $shipment->id,
                    'dhl_shipment_no' => $shipment->dhl_shipment_no,
                    'tracking_status' => $result['status'],
                    'api_used' => $result['api_used'],
                ]);

                return [
                    'success' => true,
                    'message' => 'Tracking-Informationen erfolgreich aktualisiert!',
                    'queued' => false,
                    'shipment_id' => $shipment->id,
                    'tracking_status' => $result['status'],
                    'tracking_details' => $result,
                ];
            } else {
                return [
                    'success' => false,
                    'message' => $result['message'] ?? 'Fehler beim Abrufen der Tracking-Informationen.',
                    'queued' => false,
                    'shipment_id' => $shipment->id,
                ];
            }
        } catch (Exception $e) {
            Log::error('[DHL Tracking Service] Tracking update failed (sync)', [
                'shipment_id' => $shipment->id,
                'error' => $e->getMessage(),
            ]);

            return [
                'success' => false,
                'message' => 'Fehler beim Aktualisieren der Tracking-Informationen: ' . $e->getMessage(),
                'queued' => false,
                'shipment_id' => $shipment->id,
            ];
        }
    }

    /**
     * Map DHL status codes to internal status
     */
    private function mapDhlStatusToInternal(string $dhlStatus): string
    {
        $statusMap = [
            'pre-transit' => 'created',
            'transit' => 'in_transit',
            'out-for-delivery' => 'out_for_delivery',
            'delivered' => 'delivered',
            'failure' => 'failed',
            'returned' => 'returned',
            'exception' => 'exception',
        ];

        return $statusMap[$dhlStatus] ?? 'unknown';
    }

    /**
     * Get status description in German
     */
    public function getStatusDescription(string $statusCode): string
    {
        $descriptions = [
            'pre-transit' => 'Auftrag elektronisch übermittelt',
            'transit' => 'Sendung in Zustellung',
            'out-for-delivery' => 'Wird heute zugestellt',
            'delivered' => 'Erfolgreich zugestellt',
            'failure' => 'Zustellung fehlgeschlagen',
            'returned' => 'Sendung wird zurückgeschickt',
            'exception' => 'Zustellausnahme',
        ];

        return $descriptions[$statusCode] ?? 'Unbekannter Status';
    }

    /**
     * Get SSL version constant based on configuration
     */
    private function getSslVersion(): int
    {
        $sslVersion = config('dhl.ssl.ssl_version', 'TLSv1_2');

        return match ($sslVersion) {
            'TLSv1_0' => CURL_SSLVERSION_TLSv1_0,
            'TLSv1_1' => CURL_SSLVERSION_TLSv1_1,
            'TLSv1_2' => CURL_SSLVERSION_TLSv1_2,
            'TLSv1_3' => defined('CURL_SSLVERSION_TLSv1_3') ? CURL_SSLVERSION_TLSv1_3 : CURL_SSLVERSION_TLSv1_2,
            default => CURL_SSLVERSION_TLSv1_2,
        };
    }
}