<?php

declare(strict_types=1);

namespace App\Service;

use App\Exception\BusinessException;
use App\Helper\Platform\Signer;
use App\Helper\Redis;
use App\Helper\RedisKey;
use App\Helper\StringHelper;
use App\Model\App;
use App\Model\Merchant;

class AppService extends AbstractService
{
    public function createApp(Merchant $merchant, string $appName)
    {
        $app = new App();
        $app->merchant_id = $merchant->id;
        $app->app_id = $this->generateAppId();
        $app->app_key = StringHelper::getRandomString(32);
        $app->app_name = $appName;
        $app->status = App::STATUS_ACTIVE;
        $app->save();
        return $app;
    }

    private function generateAppId()
    {
        $now = time();
        $key = RedisKey::getGenerateAppIdKey($now);
        $expireAt = strtotime(date('Y-m-d 23:59:59', $now)) + 1;
        $incrId = Redis::incr($key);
        $incrId = '' . $incrId;
        Redis::expireAt($key, $expireAt);
        $padLength = 8 - strlen($incrId);
        $incrId = str_pad($incrId, $padLength, '0', STR_PAD_LEFT);
        return date('Ymd', $now) . $incrId;
    }

    private function checkApp($appId): App
    {
        if (is_null($appId)) {
            throw new BusinessException('[app_id]错误');
        }
        $app = App::query()->where('app_id', $appId)->first();
        if (is_null($app)) {
            throw new BusinessException('APP错误');
        }
        if ($app->status != 1) {
            throw new BusinessException('应用暂未启用');
        }
        return $app;
    }

    public function checkSign($params): App
    {
        $appId = $params['app_id'] ?? null;

        $app = $this->checkApp($appId);

        if (!Signer::verify($params, $app->app_key)) {
            throw new BusinessException('验签错误');
        }

        if ($params['timestamp'] < time() - 6000) {
            throw new BusinessException('请求已过期');
        }

        return $app;
    }
}