<?php
declare(strict_types=1);

namespace app\api\controller\v1;

use app\api\cache\AuthTokenCache;
use app\api\controller\BaseController;
use app\api\util\ReturnCode;
use support\Request;
use support\Response;
use Tinywan\Jwt\JwtToken;

/**
 * 平台鉴权接口
 * 鉴权接口：/api/v1/authtoken
 * GET 参数：signature, secret, time, agent_id
 * 签名：signature = md5(agent_id.secret.time)
 */
class AuthTokenController extends BaseController
{
    /**
     * 获取 auth-token
     * GET 参数：signature, secret, time, agent_id
     * 返回 authtoken，后续 /api/v1/* 接口需在请求头携带 auth-token
     */
    public function index(Request $request): Response
    {
        $agentId = trim((string) ($request->get('agent_id', '')));
        $secret = trim((string) ($request->get('secret', '')));
        $time = trim((string) ($request->get('time', '')));
        $signature = trim((string) ($request->get('signature', '')));

        if ($agentId === '' || $secret === '' || $time === '' || $signature === '') {
            return $this->fail('Missing parameters: agent_id, secret, time, signature are required', ReturnCode::PARAMS_ERROR);
        }

        $expectedSecret = config('api.auth_token_secret', '');
        if ($expectedSecret === '') {
            return $this->fail('API_AUTH_TOKEN_SECRET is not configured', ReturnCode::SERVER_ERROR);
        }
        if ($secret !== $expectedSecret) {
            return $this->fail('Invalid secret', ReturnCode::FORBIDDEN);
        }

        $timeVal = (int) $time;
        $tolerance = (int) config('api.auth_token_time_tolerance', 300);
        $now = time();
        if ($timeVal < $now - $tolerance || $timeVal > $now + $tolerance) {
            return $this->fail('Timestamp expired or invalid, please sync time', ReturnCode::FORBIDDEN);
        }

        $expectedSignature = md5($agentId . $secret . $time);
        if ($signature !== $expectedSignature) {
            return $this->fail('Signature verification failed', ReturnCode::FORBIDDEN);
        }

        $exp = (int) config('api.auth_token_exp', 86400);
        $tokenResult = JwtToken::generateToken([
            'id' => 0,
            'agent_id' => $agentId,
            'plat' => 'api_auth_token',
            'access_exp' => $exp,
        ]);
        $token = $tokenResult['access_token'];
        if (!AuthTokenCache::setToken($agentId, $token)) {
            return $this->fail('Failed to generate token', ReturnCode::SERVER_ERROR);
        }

        return $this->success([
            'authtoken' => $token,
        ]);
    }
}