<?php

namespace App\Http\Controllers\Api\V1;

use App\Http\Controllers\Controller;
use App\Http\Requests\Sgc\StoreInvoiceRequest;
use App\Http\Requests\Sgc\StorePaymentRequest;
use App\Services\Sgc\IntegrationService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;

class SgcIntegrationController extends Controller
{
    private IntegrationService $integrationService;

    public function __construct(IntegrationService $integrationService)
    {
        $this->integrationService = $integrationService;
    }

    /**
     * POST /api/v1/integration/sgc/invoices
     * Recebe fatura do SGC
     */
    public function storeInvoice(StoreInvoiceRequest $request): JsonResponse
    {
        $idempotencyKey = $request->header('X-Idempotency-Key');
        
        if (!$idempotencyKey) {
            return response()->json([
                'status' => 'REJECTED',
                'error_code' => 'MISSING_IDEMPOTENCY_KEY',
                'message' => 'Header X-Idempotency-Key é obrigatório',
            ], 400);
        }

        // Verificar assinatura HMAC (em produção)
        // $this->verificarAssinatura($request);

        $resultado = $this->integrationService->receberFatura(
            $request->validated(),
            $idempotencyKey
        );

        $statusCode = match($resultado['status']) {
            'ACCEPTED' => 201,
            'DUPLICATE' => 409,
            'REJECTED' => 400,
            default => 500,
        };

        return response()->json($resultado, $statusCode);
    }

    /**
     * POST /api/v1/integration/sgc/payments
     * Recebe confirmação de pagamento do SGC
     */
    public function storePayment(StorePaymentRequest $request): JsonResponse
    {
        $idempotencyKey = $request->header('X-Idempotency-Key');
        
        if (!$idempotencyKey) {
            return response()->json([
                'status' => 'REJECTED',
                'error_code' => 'MISSING_IDEMPOTENCY_KEY',
                'message' => 'Header X-Idempotency-Key é obrigatório',
            ], 400);
        }

        $resultado = $this->integrationService->receberPagamento(
            $request->validated(),
            $idempotencyKey
        );

        $statusCode = match($resultado['status']) {
            'ACCEPTED' => 201,
            'DUPLICATE' => 409,
            'REJECTED' => 400,
            default => 500,
        };

        return response()->json($resultado, $statusCode);
    }

    /**
     * GET /api/v1/integration/sgc/invoices/{sgfDocNumber}/status
     * Consulta estado de uma fatura
     */
    public function getInvoiceStatus(string $sgfDocNumber): JsonResponse
    {
        $fatura = \App\Models\Sgc\Fatura::where('sgf_doc_number', $sgfDocNumber)
            ->with(['ordemCompra', 'fornecedor'])
            ->first();

        if (!$fatura) {
            return response()->json([
                'status' => 'NOT_FOUND',
                'message' => 'Fatura não encontrada',
            ], 404);
        }

        // Construir lifecycle
        $lifecycle = [
            ['event' => 'RECEBIDA', 'at' => $fatura->created_at],
        ];

        if ($fatura->status_3_way_match !== 'Pendente') {
            $lifecycle[] = [
                'event' => '3WAY_MATCH',
                'at' => $fatura->updated_at,
                'result' => $fatura->status_3_way_match,
            ];
        }

        if ($fatura->status_pagamento === 'Pago') {
            $lifecycle[] = [
                'event' => 'PAGA',
                'at' => $fatura->data_pagamento,
                'reference' => $fatura->numero_comprovativo,
            ];
        }

        return response()->json([
            'sgf_doc_number' => $fatura->sgf_doc_number,
            'current_status' => $fatura->status_pagamento,
            'lifecycle' => $lifecycle,
        ]);
    }

    /**
     * GET /api/v1/integration/sgc/stats
     * Estatísticas de integração
     */
    public function getStats(): JsonResponse
    {
        $stats = [
            'faturas' => [
                'total' => \App\Models\Sgc\Fatura::count(),
                'conformes' => \App\Models\Sgc\Fatura::conformes()->count(),
                'com_excecao' => \App\Models\Sgc\Fatura::comExcecao()->count(),
                'pagas' => \App\Models\Sgc\Fatura::pagas()->count(),
            ],
            'ordens_compra' => [
                'total' => \App\Models\Sgc\OrdemCompra::count(),
                'cabimentadas' => \App\Models\Sgc\OrdemCompra::cabimentadas()->count(),
            ],
            'integracao' => [
                'aceites' => DB::table('sgc_integration_log')
                    ->where('status', 'ACCEPTED')->count(),
                'rejeitadas' => DB::table('sgc_integration_log')
                    ->where('status', 'REJECTED')->count(),
                'duplicadas' => DB::table('sgc_integration_log')
                    ->where('status', 'DUPLICATE')->count(),
            ],
        ];

        return response()->json($stats);
    }

    /**
     * Verifica assinatura HMAC (em produção)
     */
    private function verificarAssinatura(Request $request): bool
    {
        $signature = $request->header('X-SGC-Signature');
        $secret = config('services.sgc.webhook_secret');
        
        $payload = json_encode($request->all(), JSON_UNESCAPED_SLASHES);
        $expectedSignature = hash_hmac('sha256', $payload, $secret);
        
        return hash_equals($expectedSignature, $signature);
    }
}