<?php

declare(strict_types=1);

namespace App\Http\Middleware;

use App\Constants\ErrorCode;
use App\Models\Client;
use App\Services\Auth\TokenService;
use Closure;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;

class ValidateAccessToken
{
    public function __construct(
        private readonly TokenService $tokenService
    ) {}

    public function handle(Request $request, Closure $next): Response
    {
        // 禁止訪問管理員路由
        if (str_starts_with($request->path(), 'api/admin')) {
            return response()->json([
                'success' => false,
                'error' => ErrorCode::FORBIDDEN,
                'message' => '客戶用戶無權訪問管理員資源。',
            ], Response::HTTP_FORBIDDEN);
        }

        $bearerToken = $request->bearerToken();

        if (!$bearerToken) {
            return response()->json([
                'success' => false,
                'error' => ErrorCode::UNAUTHORIZED,
                'message' => '未授權，令牌無效或未提供。',
            ], Response::HTTP_UNAUTHORIZED);
        }

        $tokenData = $this->tokenService->validateAccessToken($bearerToken);

        if (!$tokenData) {
            return response()->json([
                'success' => false,
                'error' => ErrorCode::UNAUTHORIZED,
                'message' => '訪問令牌無效或已過期。',
            ], Response::HTTP_UNAUTHORIZED);
        }

        // 檢查客戶狀態
        $client = Client::find($tokenData['client_id']);
        if (!$client || !$client->isActive()) {
            return response()->json([
                'success' => false,
                'error' => ErrorCode::CLIENT_INACTIVE,
                'message' => '客戶帳戶未啟用。',
            ], Response::HTTP_FORBIDDEN);
        }

        // 檢查 LLM 提供商狀態
        if (!$client->canSendLlmRequest()) {
            return response()->json([
                'success' => false,
                'error' => ErrorCode::PROVIDER_ERROR,
                'message' => 'LLM 提供商服務暫時不可用。',
            ], Response::HTTP_SERVICE_UNAVAILABLE);
        }

        // 將客戶信息添加到請求中
        $request->merge(['client' => $client]);

        return $next($request);
    }
}