<?php

namespace App\Http\Controllers\Repuve;

use App\Http\Controllers\Controller;
use App\Http\Requests\Repuve\CancelConstanciaRequest;
use App\Models\CatalogCancellationReason;
use App\Models\Record;
use App\Models\Tag;
use App\Models\TagCancellationLog;
use App\Models\VehicleTagLog;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Notsoweb\ApiResponse\Enums\ApiResponse;
use Barryvdh\DomPDF\Facade\Pdf;

class CancellationController extends Controller
{

    /**
     * Cancelar la constancia/tag
     */
    public function cancelarConstancia(CancelConstanciaRequest $request)
    {
        try {
            DB::beginTransaction();

            // Buscar el expediente con sus relaciones
            $record = Record::with('vehicle.tag.status')->findOrFail($request->record_id);
            $vehicle = $record->vehicle;
            $tag = $vehicle->tag;

            // Validar que el vehículo tiene un tag asignado
            if (!$tag) {
                return ApiResponse::BAD_REQUEST->response([
                    'message' => 'El vehículo no tiene un tag/constancia asignada.'
                ]);
            }

            // Validar que el tag está en estado activo
            if (!$tag->isAssigned()) {
                return ApiResponse::BAD_REQUEST->response([
                    'message' => 'El tag ya no está activo. Status actual: ' . $tag->status->name
                ]);
            }

            // Guardar información del tag anterior ANTES de cancelarlo
            $oldTagNumber = $tag->tag_number;
            $oldFolio = $tag->folio;

            // Crear registro en el log de vehiculos
            $cancellationLog = VehicleTagLog::create([
                'vehicle_id' => $vehicle->id,
                'tag_id' => $tag->id,
                'action_type' => 'cancelacion',
                'cancellation_reason_id' => $request->cancellation_reason_id,
                'cancellation_observations' => $request->cancellation_observations,
                'cancellation_at' => now(),
                'cancelled_by' => Auth::id(),
                'performed_by' => Auth::id(),
            ]);

            // Actualizar estado del tag a 'cancelled' y desasignar vehículo
            $tag->markAsCancelled();

            $newTag = null;
            $substitutionLog  = null;
            $isSubstitution = $request->filled('new_folio') && $request->filled('new_tag_number');

            if ($isSubstitution) {
                $newTag = Tag::where('folio', $request->new_folio)->first();

                if (!$newTag) {
                    DB::rollBack();
                    return ApiResponse::NOT_FOUND->response([
                        'message' => 'El nuevo tag proporcionado no existe.',
                        'new_tag_number' => $request->new_tag_number,
                    ]);
                }

                if (!$newTag->isAvailable()) {
                    DB::rollBack();
                    return ApiResponse::BAD_REQUEST->response([
                        'message' => 'El nuevo tag no está disponible para asignación',
                        'new_tag_number' => $request->new_tag_number,
                        'current_status' => $newTag->status->name,
                    ]);
                }

                if (!$newTag->tag_number) {
                    $existingTag = Tag::where('tag_number', $request->new_tag_number)->first();
                    if ($existingTag && $existingTag->id !== $newTag->id) {
                        DB::rollBack();
                        return ApiResponse::BAD_REQUEST->response([
                            'message' => 'El nuevo tag_number ya está asignado a otro folio.',
                            'new_tag_number' => $request->new_tag_number,
                            'folio_existente' => $existingTag->folio,
                        ]);
                    }

                    $newTag->tag_number = $request->new_tag_number;
                    $newTag->save();
                } elseif ($newTag->tag_number !== $request->new_tag_number) {
                    DB::rollBack();
                    return ApiResponse::BAD_REQUEST->response([
                        'message' => 'El nuevo tag ya tiene un tag_number diferente asignado.',
                        'assigned_tag_number' => $newTag->tag_number,
                        'provided_tag_number' => $request->new_tag_number,
                    ]);
                }

                // Usar el folio del request
                $newTag->markAsAssigned($vehicle->id, $request->folio);

                $substitutionLog = VehicleTagLog::create([
                    'vehicle_id' => $vehicle->id,
                    'tag_id' => $newTag->id,
                    'action_type' => 'sustitucion',
                    'cancellation_reason_id' => $request->cancellation_reason_id,
                    'cancellation_observations' => 'Tag sustituido. Tag anterior: ' . $oldTagNumber . ' (Folio: ' . $oldFolio . '). Motivo: ' . ($request->cancellation_observations ?? ''),
                    'performed_by' => Auth::id(),
                ]);

                $record->update(['folio' => $request->folio]);
            }

            DB::commit();

            $message = $isSubstitution
                ? 'Tag cancelado y sustituido exitosamente'
                : 'Constancia cancelada exitosamente';

            return ApiResponse::OK->response([
                'message' => $message,
                'is_substitution' => $isSubstitution,
                'cancellation' => [
                    'id' => $cancellationLog->id,
                    'vehicle' => [
                        'id' => $vehicle->id,
                        'placa' => $vehicle->placa,
                        'niv' => $vehicle->niv,
                    ],
                    'old_tag' => [
                        'id' => $tag->id,
                        'folio' => $tag->folio,
                        'tag_number' => $tag->tag_number,
                        'new_status' => 'Cancelado',
                    ],
                    'new_tag' => $newTag ? [
                        'id' => $newTag->id,
                        'folio' => $newTag->folio,
                        'tag_number' => $newTag->tag_number,
                        'status' => $newTag->status->name,
                    ] : null,
                    'cancellation_reason_id' => $cancellationLog->cancellationReason->name,
                    'cancellation_observations' => $request->cancellation_observations,
                    'cancelled_at' => $cancellationLog->cancellation_at->toDateTimeString(),
                    'cancelled_by' => Auth::user()->name,
                ]
            ]);
        } catch (\Exception $e) {
            DB::rollBack();

            Log::error('Error en cancelarConstancia: ' . $e->getMessage(), [
                'record_id' => $request->record_id ?? null,
                'cancellation_reason' => $request->cancellation_reason ?? null,
                'trace' => $e->getTraceAsString()
            ]);

            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al cancelar la constancia',
                'error' => $e->getMessage()
            ]);
        }
    }

    public function cancelarTagNoAsignado(Request $request)
    {
        try {
            $request->validate([
                'folio' => 'required|string|exists:tags,folio',
                'cancellation_reason_id' => 'required|exists:catalog_cancellation_reasons,id',
                'cancellation_observations' => 'nullable|string',
                'id_chip' => 'nullable|string|max:255',
                'module_id' => 'nullable|exists:modules,id',
            ]);

            DB::beginTransaction();

            $tag = Tag::where('folio', $request->folio)->first();

            if (!$tag) {
                DB::rollBack();
                return ApiResponse::NOT_FOUND->response([
                    'message' => 'No se encontró el tag con el folio proporcionado.',
                    'folio' => $request->folio,
                ]);
            }

            // Validar que el tag NO esté asignado
            if ($tag->isAssigned()) {
                return ApiResponse::BAD_REQUEST->response([
                    'message' => 'Este tag está asignado a un vehículo. Usa el endpoint de cancelación de constancia.',
                    'tag_status' => $tag->status->name,
                ]);
            }

            // Validar que no esté ya cancelado
            if ($tag->isCancelled()) {
                return ApiResponse::BAD_REQUEST->response([
                    'message' => 'El tag ya está cancelado.',
                ]);
            }


            $additionalInfo = [];
            if ($request->filled('id_chip')) {
                $additionalInfo[] = "ID CHIP: {$request->id_chip}";
            }

            $observations = $request->cancellation_observations;
            if (!empty($additionalInfo)) {
                $observations = ($observations ? $observations . ' | ' : '') . implode(' | ', $additionalInfo);
            }

            $cancellationLog = TagCancellationLog::create([
                'tag_id' => $tag->id,
                'cancellation_reason_id' => $request->cancellation_reason_id,
                'cancellation_observations' => $observations,
                'cancellation_at' => now(),
                'cancelled_by' => Auth::id(),
            ]);

            // Actualizar el módulo del tag si se proporciona
            if ($request->filled('module_id')) {
                $tag->module_id = $request->module_id;
                $tag->save();
            }

            // Cancelar el tag
            $tag->markAsDamaged();

            DB::commit();

            try {
                // Recargar el tag con sus relaciones actualizadas
                $tag->load(['status', 'cancellationLogs.cancellationReason', 'cancellationLogs.cancelledBy', 'module']);

                // Obtener datos de cancelación del último log
                $lastCancellation = $tag->cancellationLogs()
                    ->with(['cancellationReason', 'cancelledBy'])
                    ->latest()
                    ->first();

                // Preparar datos para el PDF
                $cancellationData = [
                    'fecha' => $lastCancellation ? $lastCancellation->cancellation_at->format('d/m/Y') : now()->format('d/m/Y'),
                    'folio' => $tag->folio ?? '',
                    'id_chip' => $request->id_chip ?? '',
                    'motivo' => $lastCancellation && $lastCancellation->cancellationReason
                        ? $lastCancellation->cancellationReason->name
                        : 'No especificado',
                    'operador' => $lastCancellation && $lastCancellation->cancelledBy
                        ? $lastCancellation->cancelledBy->name
                        : 'Sistema',
                    'modulo' => $tag->module ? $tag->module->name : 'No especificado',
                    'ubicacion' => $tag->module ? $tag->module->address : 'No especificado',
                ];

                $pdf = Pdf::loadView('pdfs.tag', [
                    'cancellation' => $cancellationData,
                ])
                    ->setPaper('a4', 'portrait')
                    ->setOptions([
                        'defaultFont' => 'sans-serif',
                        'isHtml5ParserEnabled' => true,
                        'isRemoteEnabled' => true,
                    ]);

                return $pdf->stream('constancia_cancelada_' . ($tag->tag_number ?? $tag->folio) . '.pdf');
            } catch (\Exception $e) {
                // Si falla la generación del PDF, devolver respuesta JSON
                Log::error('Error al generar PDF de tag cancelado: ' . $e->getMessage());

                return ApiResponse::OK->response([
                    'message' => 'Tag cancelado exitosamente (Error al generar PDF)',
                    'tag' => [
                        'id' => $tag->id,
                        'tag_number' => $tag->tag_number,
                        'folio' => $tag->folio,
                        'previous_status' => 'Disponible',
                        'new_status' => 'Dañado',
                    ],
                    'cancellation' => [
                        'id' => $cancellationLog->id,
                        'reason' => $cancellationLog->cancellationReason->name,
                        'observations' => $cancellationLog->cancellation_observations,
                        'cancelled_at' => $cancellationLog->cancellation_at->toDateTimeString(),
                        'cancelled_by' => Auth::user()->name,
                    ],
                    'pdf_error' => $e->getMessage(),
                ]);
            }
        } catch (\Exception $e) {
            DB::rollBack();

            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al cancelar el tag',
                'error' => $e->getMessage(),
            ]);
        }
    }
}