<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Jobs\CancelShipmentJob;
use App\Jobs\CreateReturnLabelJob;
use App\Jobs\TrackShipmentJob;
// Old DHL model replaced with new package model
use Acme\Dhl\Models\DhlShipment;
use App\Models\ShoppingOrder;
use App\Services\DhlModalService;
use App\Services\DhlShipmentService;
use Exception;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;
use Illuminate\View\View;
use Illuminate\Support\Facades\Redirect;
use Illuminate\Support\Facades\Session;
use Yajra\DataTables\Facades\DataTables;

// Import new DHL package and SettingController
use Acme\Dhl\DhlManager;

/**
 * DHL Shipment Controller
 * 
 * Handles all DHL shipment operations including creation, cancellation,
 * tracking, and return labels. Provides both web interface and AJAX endpoints.
 */
class DhlShipmentController extends Controller
{
    /**
     * Constructor
     */
    public function __construct()
    {
        $this->middleware('auth');
        $this->middleware('admin')->except(['show', 'track']);
    }

    /**
     * Test the DHL API login credentials and return a JSON response.
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function testLogin()
    {
        try {
            // Get DHL configuration with admin settings
            $settingController = new \App\Http\Controllers\SettingController();
            $dhlConfig = $settingController->getDhlConfig();

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

            // Test the connection
            $connectionTest = $dhlClient->testConnection();

            if ($connectionTest) {
                $result = [
                    'success' => true,
                    'message' => 'DHL API Verbindung erfolgreich getestet!',
                    'details' => [
                        'base_url' => $dhlConfig['base_url'],
                        'using_admin_config' => !empty($dhlConfig['api_key'])
                    ]
                ];
            } else {
                $result = [
                    'success' => false,
                    'message' => 'DHL API Verbindung fehlgeschlagen. Prüfen Sie Ihre Zugangsdaten.'
                ];
            }

            return response()->json($result);
        } catch (Exception $e) {
            Log::error('[DHL Controller] Test login failed', [
                'error' => $e->getMessage()
            ]);

            return response()->json([
                'success' => false,
                'message' => 'DHL API Test fehlgeschlagen: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Display the DHL Cockpit (main overview)
     * 
     * @param Request $request
     * @return View
     */
    public function index(Request $request): View
    {
        // Statistics for dashboard widgets
        $stats = [
            'total_shipments' => DhlShipment::count(),
            'pending_shipments' => DhlShipment::where('status', 'pending')->count(),
            'shipped_today' => DhlShipment::whereDate('created_at', today())->count(),
            'returns_count' => DhlShipment::where('type', 'return')->count(),
        ];

        return view('admin.dhl.cockpit', compact('stats'));
    }

    /**
     * Provides data for the DHL Cockpit DataTable.
     *
     * @param Request $request
     * @return \Illuminate\Http\JsonResponse
     */
    public function datatable(Request $request): JsonResponse
    {
        $query = DhlShipment::with(['shoppingOrder.shopping_user'])
            ->select('dhl_package_shipments.*') // Explicitly select to avoid conflicts
            ->orderBy('created_at', 'desc');

        // Apply filters from the request
        if ($request->filled('type')) {
            $query->where('type', $request->get('type'));
        }
        if ($request->filled('status')) {
            $query->where('status', $request->get('status'));
        }
        if ($request->filled('date_from')) {
            $query->whereDate('created_at', '>=', $request->get('date_from'));
        }
        if ($request->filled('date_to')) {
            $query->whereDate('created_at', '<=', $request->get('date_to'));
        }
        if ($request->filled('search')) {
            $search = $request->get('search');
            $query->where(function ($q) use ($search) {
                $q->where('dhl_shipment_no', 'LIKE', "%{$search}%")
                    ->orWhere('id', 'LIKE', "%{$search}%")
                    ->orWhereHas('shoppingOrder', function ($orderQuery) use ($search) {
                        $orderQuery->where('id', $search);
                    });
            });
        }

        return DataTables::eloquent($query)
            ->addColumn('checkbox', function ($shipment) {
                return '<label class="custom-control custom-checkbox mb-0"><input type="checkbox" class="custom-control-input shipment-checkbox" value="' . $shipment->id . '"><span class="custom-control-label"></span></label>';
            })
            ->editColumn('id', function ($shipment) {
                return '<a href="' . route('admin.dhl.show', $shipment) . '" class="text-primary font-weight-semibold">#' . $shipment->id . '</a>';
            })
            ->addColumn('type', function ($shipment) {
                if ($shipment->type == 'outbound') {
                    return '<span class="badge badge-primary"><i class="fas fa-arrow-right"></i> Ausgehend</span>';
                } else {
                    return '<span class="badge badge-info"><i class="fas fa-undo"></i> Retoure</span>';
                }
            })
            ->addColumn('order', function ($shipment) {
                if ($shipment->order_id) {
                    return '<a href="' . route('admin_sales_customers_detail', $shipment->order_id) . '" class="text-primary">#' . $shipment->order_id . '</a>';
                }
                return '<span class="text-muted">N/A</span>';
            })
            ->addColumn('customer', function ($shipment) {
                if ($shipment->shoppingOrder && $shipment->shoppingOrder->shopping_user) {
                    return e($shipment->shoppingOrder->shopping_user->billing_firstname) . ' ' . e($shipment->shoppingOrder->shopping_user->billing_lastname) .
                        '<br><small class="text-muted">' . e($shipment->shoppingOrder->shopping_user->billing_email) . '</small>';
                }
                return '<span class="text-muted">Unbekannt</span>';
            })
            ->editColumn('dhl_shipment_no', function ($shipment) {
                return $shipment->dhl_shipment_no ? '<code class="text-success">' . e($shipment->dhl_shipment_no) . '</code>' : '<span class="text-muted">-</span>';
            })
            ->addColumn('status', function ($shipment) {
                $statusMap = [
                    'pending'   => ['class' => 'warning', 'text' => 'Wartend'],
                    'created'   => ['class' => 'success', 'text' => 'Erstellt'],
                    'shipped'   => ['class' => 'primary', 'text' => 'Versendet'],
                    'delivered' => ['class' => 'info', 'text' => 'Zugestellt'],
                    'cancelled' => ['class' => 'secondary', 'text' => 'Storniert'],
                    'failed'    => ['class' => 'danger', 'text' => 'Fehler'],
                ];
                $statusInfo = $statusMap[$shipment->status] ?? ['class' => 'light', 'text' => e($shipment->status)];
                return '<span class="badge badge-' . $statusInfo['class'] . '">' . $statusInfo['text'] . '</span>';
            })
            ->addColumn('tracking_status', function ($shipment) {
                if ($shipment->tracking_status) {
                    return '<small class="text-muted">' . e($shipment->tracking_status) . '</small>' .
                        ($shipment->last_tracked_at ? '<br><small class="text-muted">' . $shipment->last_tracked_at->format('d.m.Y H:i') . '</small>' : '');
                }
                return '<span class="text-muted">-</span>';
            })
            ->editColumn('weight_kg', function ($shipment) {
                return number_format($shipment->weight_kg, 2) . ' kg';
            })
            ->editColumn('created_at', function ($shipment) {
                return $shipment->created_at->format('d.m.Y H:i');
            })
            ->addColumn('actions', function ($shipment) {
                $buttons = '<div class="btn-group" role="group">';
                $buttons .= '<a href="' . route('admin.dhl.show', $shipment) . '" class="btn btn-sm btn-outline-primary" data-toggle="tooltip" title="Details anzeigen"><i class="fas fa-eye"></i></a>';
                if ($shipment->label_path) {
                    $buttons .= '<a href="' . route('admin.dhl.download-label', $shipment) . '" class="btn btn-sm btn-outline-success" data-toggle="tooltip" title="Label herunterladen"><i class="fas fa-download"></i></a>';
                }
                if ($shipment->canCancel()) {
                    $buttons .= '<button type="button" class="btn btn-sm btn-outline-warning cancel-shipment-btn" data-shipment-id="' . $shipment->id . '" data-toggle="tooltip" title="Sendung stornieren"><i class="fas fa-ban"></i></button>';
                }
                if ($shipment->type == 'outbound' && !$shipment->returns()->count()) {
                    $buttons .= '<button type="button" class="btn btn-sm btn-outline-info create-return-btn" data-shipment-id="' . $shipment->id . '" data-toggle="tooltip" title="Retourenlabel erstellen"><i class="fas fa-undo"></i></button>';
                }
                $buttons .= '</div>';
                return $buttons;
            })
            ->rawColumns(['checkbox', 'id', 'type', 'order', 'customer', 'dhl_shipment_no', 'status', 'tracking_status', 'actions'])
            ->make(true);
    }

    /**
     * Show the form for creating a new shipment
     * 
     * @param ShoppingOrder $order
     * @return View
     */
    public function create(ShoppingOrder $order): View|\Illuminate\Http\RedirectResponse
    {
        // Check if order already has a shipment
        $existingShipment = DhlShipment::where('shopping_order_id', $order->id)
            ->where('type', 'outbound')
            ->first();

        if ($existingShipment) {
            return redirect()->route('admin.dhl.show', $existingShipment)
                ->with('warning', 'Für diese Bestellung existiert bereits eine Sendung.');
        }

        return view('admin.dhl.create', compact('order'));
    }

    /**
     * Store a new shipment (async via queue)
     * 
     * @param Request $request
     * @return JsonResponse
     */
    public function store(Request $request): JsonResponse
    {
        try {
            // Use DhlModalService for validation
            $dhlModalService = new DhlModalService();
            $validationResult = $dhlModalService->validateShipmentData($request->all());

            if (!$validationResult['valid']) {
                return response()->json([
                    'success' => false,
                    'message' => 'Validierungsfehler: ' . implode(', ', $validationResult['errors'])
                ], 422);
            }

            // Basic Laravel validation as fallback
            $request->validate([
                'order_id' => 'required|exists:shopping_orders,id',
                'weight' => 'required|numeric|min:0.1|max:31.5',
                'product_code' => 'sometimes|string',
                'priority' => 'sometimes|string|in:normal,high',
                'auto_track' => 'sometimes|boolean',
                // Shipping address validation
                'shipping_firstname' => 'required|string|max:50',
                'shipping_lastname' => 'required|string|max:50',
                'shipping_company' => 'nullable|string|max:100',
                'shipping_address' => 'required|string|max:100',
                'shipping_houseNumber' => 'required|string|max:50',
                'shipping_zipcode' => 'required|string|max:10',
                'shipping_city' => 'required|string|max:50',
                'shipping_country_id' => 'required|exists:countries,id',
                'shipping_phone' => 'nullable|string|max:20',
            ]);

            $order = ShoppingOrder::findOrFail($request->order_id);

            // Check if shipment already exists
            /* $existingShipment = DhlShipment::where('shopping_order_id', $order->id)
                ->where('type', 'outbound')
                ->first();

            if ($existingShipment) {
                return response()->json([
                    'success' => false,
                    'message' => 'Für diese Bestellung existiert bereits eine Sendung.'
                ], 422);
            }
            */

            // Use service to prepare address data
            $shippingAddress = $dhlModalService->prepareAddressForApi($request->all());

            // Prepare options for shipment creation
            $options = [
                'product_code' => $request->get('product_code', 'V01PAK'),
                'priority' => $request->get('priority', 'normal'),
                'auto_track' => $request->get('auto_track', true),
                'shipping_address' => $shippingAddress,
                'services' => $request->get('services', []),
                'dimensions' => $request->only(['length', 'width', 'height'])
            ];

            // Use DhlShipmentService (handles queue/sync automatically based on config)
            $dhlShipmentService = new DhlShipmentService();
            $result = $dhlShipmentService->createShipment($order, (float) $request->weight, $options);

            Log::info('[DHL Controller] Shipment creation processed', [
                'order_id' => $order->id,
                'weight' => $request->weight,
                'queued' => $result['queued'] ?? false,
                'success' => $result['success'] ?? false,
            ]);

            return response()->json($result);
        } catch (Exception $e) {
            Log::error('[DHL Controller] Failed to dispatch shipment creation', [
                'error' => $e->getMessage(),
                'order_id' => $request->order_id ?? 'unknown',
            ]);

            return response()->json([
                'success' => false,
                'message' => 'Fehler beim Erstellen der Sendung: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Display the specified shipment
     * 
     * @param DhlShipment $shipment
     * @return View
     */
    public function show(DhlShipment $shipment): View
    {
        $shipment->load(['shoppingOrder.shopping_user', 'relatedShipment']);

        return view('admin.dhl.show', compact('shipment'));
    }

    /**
     * Cancel the specified shipment
     * 
     * @param Request $request
     * @param DhlShipment $shipment
     * @return JsonResponse
     */
    public function cancel(Request $request, DhlShipment $shipment): JsonResponse
    {
        try {
            // Validate cancellation is possible
            if (!$shipment->canCancel()) {
                return response()->json([
                    'success' => false,
                    'message' => 'Diese Sendung kann nicht mehr storniert werden.'
                ], 422);
            }

            // Dispatch cancellation job
            $options = [
                'priority' => $request->get('priority', 'normal')
            ];

            CancelShipmentJob::dispatch($shipment, $options);

            Log::info('[DHL Controller] Shipment cancellation job dispatched', [
                'shipment_id' => $shipment->id,
                'shipment_number' => $shipment->shipment_number,
            ]);

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

            return response()->json([
                'success' => false,
                'message' => 'Fehler beim Stornieren der Sendung: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Create return label for the specified shipment
     * 
     * @param Request $request
     * @param DhlShipment $shipment
     * @return JsonResponse
     */
    public function createReturnLabel(Request $request, DhlShipment $shipment): JsonResponse
    {
        try {
            // Validate return label creation is possible
            if ($shipment->type !== 'outbound') {
                return response()->json([
                    'success' => false,
                    'message' => 'Retourenlabels können nur für ausgehende Sendungen erstellt werden.'
                ], 422);
            }

            // Check if return label already exists
            $existingReturn = DhlShipment::where('related_shipment_id', $shipment->id)
                ->where('type', 'return')
                ->first();

            if ($existingReturn) {
                return response()->json([
                    'success' => false,
                    'message' => 'Für diese Sendung existiert bereits ein Retourenlabel.'
                ], 422);
            }

            // Dispatch return label creation job
            $options = [
                'auto_track' => $request->get('auto_track', false),
                'priority' => $request->get('priority', 'normal')
            ];

            CreateReturnLabelJob::dispatch($shipment, $options);

            Log::info('[DHL Controller] Return label creation job dispatched', [
                'original_shipment_id' => $shipment->id,
                'shipment_number' => $shipment->shipment_number,
            ]);

            return response()->json([
                'success' => true,
                'message' => 'Retourenlabel wird erstellt...'
            ]);
        } catch (Exception $e) {
            Log::error('[DHL Controller] Failed to dispatch return label creation', [
                'error' => $e->getMessage(),
                'shipment_id' => $shipment->id,
            ]);

            return response()->json([
                'success' => false,
                'message' => 'Fehler beim Erstellen des Retourenlabels: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Update tracking status for the specified shipment
     * 
     * @param DhlShipment $shipment
     * @return JsonResponse
     */
    public function updateTracking(DhlShipment $shipment): JsonResponse
    {
        try {
            if (!$shipment->tracking_number) {
                return response()->json([
                    'success' => false,
                    'message' => 'Keine Tracking-Nummer verfügbar.'
                ], 422);
            }

            // Dispatch tracking update job
            TrackShipmentJob::dispatch($shipment, ['auto_retrack' => false]);

            Log::info('[DHL Controller] Tracking update job dispatched', [
                'shipment_id' => $shipment->id,
                'tracking_number' => $shipment->tracking_number,
            ]);

            return response()->json([
                'success' => true,
                'message' => 'Tracking-Informationen werden aktualisiert...'
            ]);
        } catch (Exception $e) {
            Log::error('[DHL Controller] Failed to dispatch tracking update', [
                'error' => $e->getMessage(),
                'shipment_id' => $shipment->id,
            ]);

            return response()->json([
                'success' => false,
                'message' => 'Fehler beim Aktualisieren der Tracking-Informationen: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Download shipping label
     * 
     * @param DhlShipment $shipment
     * @return Response
     */
    public function downloadLabel(DhlShipment $shipment): Response
    {
        try {
            if (!$shipment->label_path || !Storage::exists($shipment->label_path)) {
                abort(404, 'Versandlabel nicht gefunden.');
            }

            $labelContent = Storage::get($shipment->label_path);
            $filename = sprintf(
                'dhl-label-%s-%s.pdf',
                $shipment->type,
                $shipment->shipment_number ?: $shipment->id
            );

            return response($labelContent, 200)
                ->header('Content-Type', 'application/pdf')
                ->header('Content-Disposition', "attachment; filename=\"{$filename}\"");
        } catch (Exception $e) {
            Log::error('[DHL Controller] Failed to download label', [
                'error' => $e->getMessage(),
                'shipment_id' => $shipment->id,
                'label_path' => $shipment->label_path,
            ]);

            abort(500, 'Fehler beim Download des Versandlabels.');
        }
    }

    /**
     * Batch operations (multiple shipments)
     * 
     * @param Request $request
     * @return JsonResponse
     */
    public function batchAction(Request $request): JsonResponse
    {
        try {
            $request->validate([
                'action' => 'required|in:cancel,download_labels,update_tracking',
                'shipment_ids' => 'required|array|min:1',
                'shipment_ids.*' => 'exists:dhl_package_shipments,id',
            ]);

            $shipmentIds = $request->shipment_ids;
            $action = $request->action;
            $processed = 0;
            $errors = [];

            foreach ($shipmentIds as $shipmentId) {
                try {
                    $shipment = DhlShipment::findOrFail($shipmentId);

                    switch ($action) {
                        case 'cancel':
                            if ($shipment->canCancel()) {
                                CancelShipmentJob::dispatch($shipment);
                                $processed++;
                            } else {
                                $errors[] = "Sendung {$shipment->shipment_number} kann nicht storniert werden.";
                            }
                            break;

                        case 'update_tracking':
                            if ($shipment->tracking_number) {
                                TrackShipmentJob::dispatch($shipment, ['auto_retrack' => false]);
                                $processed++;
                            } else {
                                $errors[] = "Sendung {$shipment->shipment_number} hat keine Tracking-Nummer.";
                            }
                            break;

                        case 'download_labels':
                            // This would require ZIP creation - implement if needed
                            $errors[] = "Stapel-Download noch nicht implementiert.";
                            break;
                    }
                } catch (Exception $e) {
                    $errors[] = "Fehler bei Sendung {$shipmentId}: " . $e->getMessage();
                }
            }

            Log::info('[DHL Controller] Batch action executed', [
                'action' => $action,
                'processed' => $processed,
                'errors_count' => count($errors),
            ]);

            return response()->json([
                'success' => $processed > 0,
                'message' => sprintf('%d Sendungen verarbeitet.', $processed),
                'processed' => $processed,
                'errors' => $errors,
            ]);
        } catch (Exception $e) {
            Log::error('[DHL Controller] Batch action failed', [
                'error' => $e->getMessage(),
                'action' => $request->action ?? 'unknown',
            ]);

            return response()->json([
                'success' => false,
                'message' => 'Fehler bei der Stapelverarbeitung: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Public tracking page (for customers)
     * 
     * @param Request $request
     * @return View|JsonResponse
     */
    public function track(Request $request): View|JsonResponse
    {
        if ($request->expectsJson()) {
            $request->validate([
                'tracking_number' => 'required|string|min:10',
            ]);

            try {
                $shipment = DhlShipment::where('tracking_number', $request->tracking_number)->first();

                if (!$shipment) {
                    return response()->json([
                        'success' => false,
                        'message' => 'Sendung nicht gefunden.'
                    ], 404);
                }

                // Dispatch tracking update
                TrackShipmentJob::dispatch($shipment, ['auto_retrack' => false]);

                return response()->json([
                    'success' => true,
                    'data' => [
                        'tracking_number' => $shipment->tracking_number,
                        'status' => $shipment->status,
                        'tracking_status' => $shipment->tracking_status,
                        'last_tracked_at' => $shipment->last_tracked_at?->format('d.m.Y H:i'),
                    ]
                ]);
            } catch (Exception $e) {
                Log::error('[DHL Controller] Public tracking failed', [
                    'error' => $e->getMessage(),
                    'tracking_number' => $request->tracking_number ?? 'unknown',
                ]);

                return response()->json([
                    'success' => false,
                    'message' => 'Fehler beim Abrufen der Tracking-Informationen.'
                ], 500);
            }
        }

        return view('public.tracking');
    }
}