<?php
namespace common\components\delivery\platform\didi;

class Didi
{
    protected $baseUrl;
    protected $appKey;    // URL参数中的appKey
    protected $appId;     // Body参数中的appId
    protected $appSecret; // 签名用的secret
    protected $accessToken;
    protected $apiVersion = '1.0.0';
    protected $isSandbox;

    public function __construct($accessToken = '')
    {
        if (getenv('YII_ENV') == 'production') {
            $cfg = [
                'base_url' => 'https://freight.xiaojukeji.com',
                'app_key' => '6724e08ff1ac4afdbf1c000cfe722449',
                // TODO: 请填入正式环境的 appId 和 secret
                'app_id' => '', 
                'secret' => '',
            ];
            $this->isSandbox = false;
        } else {
            $cfg = [
                'base_url' => 'http://pinzhi.didichuxing.com/kop_osim',
                'app_key' => '4329d266f40144829ca5fd47a025e106',
                // 请填入测试环境的 appId 和 secret
                'app_id' => 'MDdovjIS',
                'secret' => 'b61603625ebcf69a6364fdc30ae47944630c738c',
            ];
            $this->isSandbox = true;
        }
        $this->baseUrl = $cfg['base_url'];
        $this->appKey = $cfg['app_key'];
        $this->appId = $cfg['app_id'];
        $this->appSecret = $cfg['secret'];
        $this->accessToken = $accessToken;
    }

    /**
     * 构建API请求参数
     *
     * @param array $businessParams 业务参数
     * @return array
     */
    public function buildRequestPayload($businessParams = [])
    {
        // 1. 准备公共参数
        $timestamp = (int)(microtime(true) * 1000); // 毫秒级时间戳

        // 2. 处理业务参数 logisticsParam (JSON字符串)
        $logisticsParam = json_encode($businessParams, JSON_UNESCAPED_UNICODE); // 注意：根据文档，logisticsParam 是 json 字符串

        // 3. 生成签名
        $sign = $this->generateSignature($logisticsParam, $timestamp);

        // 4. 构建最终请求体
        $payload = [
            'appId' => $this->appId,
            'timestamp' => $timestamp,
            'appSign' => $sign,
            'logisticsParam' => $logisticsParam,
        ];

        // Token 可选，如果存在则添加
        if (!empty($this->accessToken)) {
            $payload['token'] = $this->accessToken;
        }

        // 默认自主模式 businessMode=0，如果有需要可扩展
        // $payload['businessMode'] = 0;

        return $payload;
    }

    /**
     * 生成签名
     * 签名规则：MD5(logisticsParam + secret + timestamp)
     * 
     * @param string $logisticsParam json字符串
     * @param int $timestamp 毫秒时间戳
     * @return string
     */
    protected function generateSignature($logisticsParam, $timestamp)
    {
        $str = $logisticsParam . $this->appSecret . $timestamp;
        return md5($str);
    }

    /**
     * 获取完整的API请求URL
     *
     * @param string $apiMethod API名称
     * @return string
     */
    public function getApiUrl($apiMethod)
    {
        // url格式：{host}/gateway?api=xxx&apiVersion=1.0.0&appKey=xxx
        $queryParams = [
            'api' => $apiMethod,
            'apiVersion' => $this->apiVersion,
            'appKey' => $this->appKey,
        ];
        
        return $this->baseUrl . '/gateway?' . http_build_query($queryParams);
    }

    public function getIsSandbox()
    {
        return $this->isSandbox;
    }
}