<?php

namespace App\Http\Controllers\App;

use App\Http\Controllers\Controller;
use App\Http\Requests\App\InvoiceStoreRequest;
use App\Models\Client;
use App\Models\InvoiceRequest;
use App\Models\Sale;
use Illuminate\Http\Request;
use Notsoweb\ApiResponse\Enums\ApiResponse;

class InvoiceController extends Controller
{
    /**
     * Muestra los datos de la venta para el formulario de facturación.
     */
    public function show(string $invoiceNumber)
    {
        $sale = Sale::where('invoice_number', $invoiceNumber)
            ->with([
                'client',
                'details.inventory.category',
                'details.serials',
                'user:id,name,email',
                'invoiceRequests' => function ($query) {
                    $query->orderBy('requested_at', 'desc');
                },
            ])->first();

        if (!$sale) {
            return ApiResponse::NOT_FOUND->response([
                'message' => 'Venta no encontrada'
            ]);
        }

        // Verificar si ya tiene solicitud pendiente o procesada
        $existingRequest = $sale->invoiceRequests
            ->whereIn('status', [InvoiceRequest::STATUS_PENDING, InvoiceRequest::STATUS_PROCESSED])
            ->first();

        if ($existingRequest) {
            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Esta venta ya tiene una solicitud de facturación ' .
                    ($existingRequest->status === InvoiceRequest::STATUS_PENDING ? 'pendiente' : 'procesada'),
                'invoice_request' => $existingRequest,
            ]);
        }

        // Buscar cliente existente si la venta ya tiene cliente asociado
        $existingClient = null;
        if ($sale->client_id) {
            $existingClient = $sale->client;
        }

        return ApiResponse::OK->response([
            'sale' => $this->formatSaleData($sale),
            'client' => $sale->client,
            'existing_client' => $existingClient,
            'invoice_requests' => $sale->invoiceRequests,
        ]);
    }


    /**
     * Guarda los datos fiscales del cliente para la venta.
     */
    public function store(InvoiceStoreRequest $request, string $invoiceNumber)
    {
        $sale = Sale::where('invoice_number', $invoiceNumber)
            ->with('details.serials')
            ->first();

        if (!$sale) {
            return  ApiResponse::INTERNAL_ERROR->response([
                'message' => 'Venta no encontrada'
            ]);
        }

        $existingRequest = InvoiceRequest::where('sale_id', $sale->id)
            ->whereIn('status', [InvoiceRequest::STATUS_PENDING, InvoiceRequest::STATUS_PROCESSED])
            ->first();

        if ($existingRequest) {
            return ApiResponse::NO_CONTENT->response([
                'message' => 'Esta venta ya tiene una solicitud de facturación ' .
                    ($existingRequest->status === InvoiceRequest::STATUS_PENDING ? 'pendiente' : 'procesada')
            ]);
        }

        // Verificar que la venta esté completada
        if ($sale->status !== 'completed') {
            return  ApiResponse::BAD_REQUEST->response([
                'message' => 'Solo se pueden facturar ventas completadas'
            ]);
        }

        // Buscar si ya existe un cliente con ese RFC
        $client = Client::where('rfc', strtoupper($request->rfc))->first();

        if ($client) {
            // Solo actualizar campos que el usuario proporciona explícitamente
            $updateData = [];

            // Actualizar nombre solo si es diferente y fue proporcionado
            if ($request->filled('name') && $request->name !== $client->name) {
                $updateData['name'] = $request->name;
            }

            // Actualizar email solo si es diferente y fue proporcionado
            if ($request->filled('email') && $request->email !== $client->email) {
                $updateData['email'] = $request->email;
            }

            // Actualizar teléfono si fue proporcionado
            if ($request->filled('phone')) {
                $updateData['phone'] = $request->phone;
            }

            // Actualizar dirección si fue proporcionada
            if ($request->filled('address')) {
                $updateData['address'] = $request->address;
            }

            // Actualizar datos fiscales siempre (son obligatorios en el request)
            $updateData['razon_social'] = $request->razon_social;
            $updateData['regimen_fiscal'] = $request->regimen_fiscal;
            $updateData['cp_fiscal'] = $request->cp_fiscal;
            $updateData['uso_cfdi'] = $request->uso_cfdi;

            // Solo actualizar si hay cambios
            if (!empty($updateData)) {
                $client->update($updateData);
            }
        } else {
            // Crear nuevo cliente
            $client = Client::create([
                'name' => $request->name,
                'client_number' => strtoupper($request->rfc),
                'email' => $request->email,
                'phone' => $request->phone,
                'address' => $request->address,
                'rfc' => strtoupper($request->rfc),
                'razon_social' => $request->razon_social,
                'regimen_fiscal' => $request->regimen_fiscal,
                'cp_fiscal' => $request->cp_fiscal,
                'uso_cfdi' => $request->uso_cfdi,
            ]);
        }

        // Asociar cliente a la venta solo si no está ya asociado
        if ($sale->client_id !== $client->id) {
            $sale->update(['client_id' => $client->id]);
        }

        // Crear solicitud de facturación
        $invoiceRequest = InvoiceRequest::create([
            'sale_id' => $sale->id,
            'client_id' => $client->id,
            'status' => InvoiceRequest::STATUS_PENDING,
            'requested_at' => now(),
        ]);

        return ApiResponse::OK->response([
            'message' => 'Solicitud de facturación guardada correctamente',
            'client' => $client->fresh(),
            'sale' => $this->formatSaleData($sale->fresh('details.serials')),
            'invoice_request' => $invoiceRequest,
        ]);
    }

    /**
     * Verificar si existe un cliente con el RFC proporcionado
     */
    public function checkRfc(Request $request)
    {
        $request->validate([
            'rfc' => ['required', 'string', 'min:12', 'max:13'],
        ]);

        $rfc = $request->input('rfc');

        $client = Client::where('rfc', strtoupper($rfc))->first();

        if ($client) {
            return ApiResponse::OK->response([
                'exists' => true,
                'client' => [
                    'name' => $client->name,
                    'email' => $client->email,
                    'phone' => $client->phone,
                    'address' => $client->address,
                    'rfc' => $client->rfc,
                    'razon_social' => $client->razon_social,
                    'regimen_fiscal' => $client->regimen_fiscal,
                    'cp_fiscal' => $client->cp_fiscal,
                    'uso_cfdi' => $client->uso_cfdi,
                ]
            ]);
        }

        return ApiResponse::OK->response([
            'exists' => false
        ]);
    }

    /**
     * Formatear datos de la venta incluyendo números de serie
     */
    private function formatSaleData(Sale $sale): array
    {
        return [
            'id' => $sale->id,
            'invoice_number' => $sale->invoice_number,
            'total' => $sale->total,
            'subtotal' => $sale->subtotal,
            'tax' => $sale->tax,
            'payment_method' => $sale->payment_method,
            'status' => $sale->status,
            'created_at' => $sale->created_at,
            'user' => $sale->user ? [
                'id' => $sale->user->id,
                'name' => $sale->user->name,
                'email' => $sale->user->email,
            ] : null,
            'items' => $sale->details->map(function ($detail) {
                return [
                    'id' => $detail->id,
                    'product_name' => $detail->product_name,
                    'quantity' => $detail->quantity,
                    'unit_price' => $detail->unit_price,
                    'subtotal' => $detail->subtotal,
                    'category' => $detail->inventory->category->name ?? null,
                    'sku' => $detail->inventory->sku ?? null,
                    // Números de serie vendidos
                    'serial_numbers' => $detail->serials->map(function ($serial) {
                        return [
                            'serial_number' => $serial->serial_number,
                            'status' => $serial->status,
                        ];
                    })->toArray(),
                ];
            })->toArray(),
        ];
    }
}