<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api;

use App\Constants\ErrorCode;
use App\Http\Controllers\Controller;
use App\Services\Auth\TokenService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Illuminate\Validation\ValidationException;

class AuthController extends Controller
{
    /**
     * @var TokenService
     */
    private readonly TokenService $tokenService;

    public function __construct(TokenService $tokenService)
    {
        $this->tokenService = $tokenService;
    }

    /**
     * 獲取訪問令牌
     *
     * @param Request $request
     * @return JsonResponse
     * @throws ValidationException
     */
    public function getAccessToken(Request $request): JsonResponse
    {
        try {
            /** @var array{auth_token: string} $validated */
            $validated = $request->validate([
                'auth_token' => 'required|string|size:64',
            ]);

            /** @var array{client_id: int, expires_at: string}|null $authTokenData */
            $authTokenData = $this->tokenService->validateAuthToken($validated['auth_token']);

            if (!$authTokenData || !isset($authTokenData['expires_at'])) {
                return $this->error(
                    ErrorCode::TOKEN_INVALID,
                    '認證令牌無效。'
                );
            }

            if (now()->isAfter($authTokenData['expires_at'])) {
                return $this->error(
                    ErrorCode::TOKEN_EXPIRED,
                    '認證令牌已過期，請重新獲取。'
                );
            }

            /** @var array{access_token: string, expires_in: int} $result */
            $result = $this->tokenService->generateAccessToken($authTokenData);

            if (!isset($result['access_token']) || !isset($result['expires_in'])) {
                throw new \RuntimeException('生成訪問令牌失敗。');
            }

            return $this->success([
                'access_token' => $result['access_token'],
                'expires_in' => $result['expires_in'],
            ]);

        } catch (ValidationException $e) {
            return $this->error(
                ErrorCode::VALIDATION_ERROR,
                ErrorCode::getMessage(ErrorCode::VALIDATION_ERROR),
                $e->errors()
            );
        } catch (\Exception $e) {
            Log::error('Error generating access token', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return $this->error(
                ErrorCode::SERVER_ERROR,
                ErrorCode::getMessage(ErrorCode::SERVER_ERROR)
            );
        }
    }
}