<?php

namespace App\Helper;

use App\Helper\Bytedance\ByteDanceAPI;
use App\Models\Pay;
use Carbon\Carbon;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\GuzzleException;

/**
 * Class ByteDance
 *
 * @package App\Helper
 * @property-read  string $appId
 * @property-read  string $slat
 * @property-read  string $secret
 * @property-read  string $token
 * @property-read  string $accessTokenFile
 * @property-read  string $accessToken
 * @property-read  string $noticeUrl
 * @property-read  string $validTimestamp
 */
class ByteDance
{
    private $appId = null;
    private $secret = null;
    private $slat = null;
    private $token = null;


    private $accessTokenFile = null;
    private $accessToken = null;
    private $noticeUrl = null;
    //订单过期时间(秒);
    private $validTimestamp = 24 * 60 * 60;

    /**
     * @param array $config
     * @return $this
     */
    public function factory($config = [])
    {
        $this->appId = $config['app_id'];
        $this->secret = $config['app_secret'];
        $this->slat = $config['slat'];
        $this->token = $config['token'];
        $this->accessTokenFile = storage_path('app/bytedance/bytedance_access_token.json');
        $this->accessToken = $this->checkAccessToken();

        $this->noticeUrl = env('APP_URL').'/api/pay/bytedance/notify';
        return $this;
    }

    /**
     * @param string $code
     * @return array|mixed
     * @throws \Exception
     */
    public function login($code = '')
    {
        return $this->post(ByteDanceAPI::LOGIN, [
            'appid'      => $this->appId,
            'secret'     => $this->secret,
            'code'       => $code,
        ]);
    }

    /**
     * @param string $sessionKey
     * @param string $iv
     * @param string $encrypted
     * @return array
     * @throws \Exception
     */
    public function decryptData(string $sessionKey, string $iv, string $encrypted): array
    {
        $decrypted =  openssl_decrypt(
            base64_decode($encrypted,true),
            'AES-128-CBC',
            base64_decode($sessionKey),
            OPENSSL_RAW_DATA,
            base64_decode($iv)
        );
        $decrypted = json_decode($decrypted,true);
        if(empty($decrypted)){
            throw new \Exception('解密数据错误');
        }

        return $decrypted;
    }

    /**
     * 校验access token 是否过期
     * @return mixed
     */
    private function checkAccessToken() : string
    {
        try {
            $dir = storage_path('app/bytedance');
            if (!is_dir($dir)) mkdir($dir, 0755);
            if (!is_file($this->accessTokenFile)) touch($this->accessTokenFile);

            $accessToken = file_get_contents($this->accessTokenFile);
            $accessToken = $accessToken ? json_decode($accessToken,true) : null;
            if (empty($accessToken) || $accessToken['expires_at'] < time()) {
                $accessToken = $this->getAccessToken();
            }else{
                $accessToken = $accessToken['access_token'];
            }
            return $accessToken;
        } catch (\Exception $e) {

        }
    }


    /**
     * 获取 access token
     * @throws \Exception
     */
    private function getAccessToken() : string
    {
        $res = $this->post(ByteDanceAPI::ACCESS_TOKEN, [
            'grant_type' => 'client_credential',
            'appid'      => $this->appId,
            'secret'     => $this->secret,
        ]);
        if (!empty($res['err_no'])) {
            throw new \Exception('获取access token 错误');
        }

        file_put_contents($this->accessTokenFile, json_encode([
            'access_token' => $res['access_token'],
            'expires_at'   => $res['expiresAt']
        ]));

        return $res['access_token'];
    }

    /**
     * 接口请求
     *
     * @param string $uri
     * @param array  $data
     * @return array|mixed
     * @throws \Exception
     */
    private function post($uri = '', $data = []) : array
    {
        try {
            $client = new Client();
            $res = $client->post($uri, [
                'verify'  => false,
                'headers' => ['Content-Type' => 'application/json'],
                'body'    => json_encode($data)
            ]);
            $stringBody = (string)$res->getBody();
            $res = json_decode($stringBody, true);

            if(!empty($res['err_no'])){
                throw new \Exception("请求字节跳动API接口错误，错误码:{$res['err_no']},错误信息:{$res['err_tips']}");
            }
            return $res['data'];
        } catch (GuzzleException $e) {
            \Log::error($e->getMessage());
            throw new \Exception($e->getMessage());
        }
    }


    /**
     * @param $outOrderNo
     * @param $totalAmount
     * @return array|mixed
     * @throws \Exception
     */
    public function createOrder($outOrderNo, $totalAmount)
    {
        $data = [
            'app_id'       => $this->appId,
            'out_order_no' => $outOrderNo,
            'total_amount' => intval($totalAmount * 100),
            'subject'      => "订单号：".$outOrderNo,
            'body'         => '抖音担保支付',
            'valid_time'   => $this->validTimestamp,
            'sign'         => $this->secret
            //'notify_url'   => $notifyUrl, // 可以不设置 使用小程序后台设置的回调
        ];
        $data = array_filter($data);
        $data['sign'] = $this->getSign($data);

        return $this->post(
            ByteDanceAPI::CREATE_ORDER,
            $data
        );
    }

    /**
     * @param array  $data
     * @return string
     */
    public function getSign(array $data)
    {
        $rList = array();
        foreach ($data as $k => $v) {
            if ($k == "other_settle_params" || $k == "app_id" || $k == "sign" || $k == "thirdparty_id")
                continue;
            $value = trim(strval($v));
            $len = strlen($value);
            if ($len > 1 && substr($value, 0, 1) == "\"" && substr($value, $len, $len - 1) == "\"")
                $value = substr($value, 1, $len - 1);
            $value = trim($value);
            if ($value == "" || $value == "null")
                continue;
            array_push($rList, $value);
        }
        array_push($rList, $this->slat);
        sort($rList, SORT_STRING);
        return md5(implode('&', $rList));
    }

    /**
     * @param array  $data
     * @return string
     */
    public function getNotifySign(array $data)
    {
        $filtered = [];
        foreach ($data as $key => $value) {
            if (in_array($key, ['msg_signature', 'type'])) {
                continue;
            }
            $value = trim(strval($value));
            $len = strlen($value);
            if ($len > 1 && substr($value, 0, 1) == "\"" && substr($value, $len, $len - 1) == "\"")
                $value = substr($value, 1, $len - 1);
            $filtered[] =
                is_string($value)
                    ? trim($value)
                    : $value;
        }
        $filtered[] = trim($this->token);
        sort($filtered, SORT_STRING);
        return sha1(trim(implode('', $filtered)));
    }

    /**
     * @param \Closure $closure
     * @return \Illuminate\Http\JsonResponse
     * @throws \Exception
     */
    public function payNotify(\Closure $closure)
    {
        call_user_func($closure, $this->getNoticeData());

        return response()->json($data);

        if ($notify['msg_signature'] !== $this->getNotifySign($notify)) {
            \Log::error('回调验证错误');
            $data = [
                'err_no' => 1,
                'err_tips' => 'fail'
            ];
        } else {
            $order = json_decode($notify['msg'], true);
            //处理订单
            $payId = $order['cp_orderno'];

            $pay = Pay::find($payId);
            $pay->pay_type = $order['way'];
            $pay->serial_number = $order['channel_no'];
            $pay->status = $order['status'] == 'SUCCESS';
            $pay->pay_dt = Carbon::now()->toDateString();
            $pay->save();


            $data = [
                'err_no'    => 0,
                'err_tips'  => 'success'
            ];
        }
        return response()->json($data);
    }

    private function getNoticeData()
    {
        $notify = \request()->all();
        $notify = '{"msg":"{\"appid\":\"tt5b312d8cc40f46b701\",\"cp_orderno\":\"10022082800824490007\",\"cp_extra\":\"\",\"way\":\"2\",\"channel_no\":\"2022082822001477591433078541\",\"channel_gateway_no\":\"\",\"payment_order_no\":\"PCP2022082822540531221069106962\",\"out_channel_order_no\":\"2022082822001477591433078541\",\"total_amount\":1,\"status\":\"SUCCESS\",\"seller_uid\":\"71227862181355706950\",\"extra\":\"\",\"item_id\":\"\",\"paid_at\":1661698458,\"message\":\"\",\"order_id\":\"7136939355201063205\",\"trade_item_list\":null,\"ec_pay_trade_no\":\"NEP2022082822540409483061846962\"}","msg_signature":"804a60e48936b14a739230cef21fe6204427732e","nonce":"78","timestamp":"1661698459","type":"payment"}';
        //获取订单信息
        $notify = json_decode($notify,true);
        \Log::info('抖音支付回调==>'.json_encode($notify,JSON_UNESCAPED_SLASHES));

        if($notify['msg_signature'] !== $this->getNotifySign($notify)){
            throw new \Exception('签名验证错误');
        }

        return json_decode($notify['msg'], true);
    }
}