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

use common\components\delivery\helpers\HttpClient;
use Yii;

/**
 * 滴滴商户授权
 * 
 * 文档参考：
 * 获取授权链接：/gateway?api=freight.open.platform.channel.standard.authUrl
 * 取消授权：/gateway?api=freight.open.platform.channel.standard.cancelAuth
 */
class Auth
{
    // API 接口名称
    const API_AUTH_URL = 'freight.open.platform.channel.standard.authUrl';
    const API_CANCEL_AUTH = 'freight.open.platform.channel.standard.cancelAuth';

    /**
     * 获取授权页面链接
     * 
     * 用户发单前，需要先进行授权绑定账号，获取此链接跳转到滴滴h5页面进行授权
     * 
     * @param string $thirdUid 接入方用户id
     * @param string $cityId 城市id（国标码，市级别）。与lat/lng二选一传递
     * @param string $lat 纬度
     * @param string $lng 经度
     * @return array ['success' => bool, 'authUrl' => string, 'error' => string]
     */
    public function getAuthUrl($thirdUid, $cityId = '', $lat = '', $lng = '')
    {
        // 此接口不需要传token参数
        $didi = new Didi();
        
        // 校验：城市编码与经纬度二选一
        if (empty($cityId) && (empty($lat) || empty($lng))) {
            return [
                'success' => false,
                'error' => '参数错误：城市编码(cityId)与经纬度(lat,lng)必须二选一传递'
            ];
        }

        $params = [
            'thirdUid' => (string)$thirdUid,
        ];
        
        if ($cityId) {
            $params['cityId'] = (string)$cityId;
        }
        if ($lat) {
            $params['lat'] = (float)$lat;
        }
        if ($lng) {
            $params['lng'] = (float)$lng;
        }

        $payload = $didi->buildRequestPayload($params);
        $url = $didi->getApiUrl(self::API_AUTH_URL);

        $response = HttpClient::post($url, $payload);
        
        return $this->parseResponse($response);
    }

    /**
     * 取消授权
     * 
     * 用户不再使用滴滴平台发单，取消授权后token失效，后续再使用需要重新授权
     * 
     * @param string $accessToken 授权token
     * @return array ['success' => bool, 'result' => int, 'error' => string]
     */
    public function cancelAuth($accessToken)
    {
        // 实例化 Didi 类传入 token，buildRequestPayload 会自动处理 token
        $didi = new Didi($accessToken);
        
        // 入参说明无业务参数
        $payload = $didi->buildRequestPayload(self::API_CANCEL_AUTH, []);
        $url = $didi->getApiUrl(self::API_CANCEL_AUTH);
        
        $response = HttpClient::post($url, $payload);
        
        return $this->parseResponse($response);
    }

    /**
     * 解析 API 响应
     * 
     * @param array $response
     * @return array
     */
    protected function parseResponse($response)
    {
        // 检查 HttpClient 返回的错误结构
        if (isset($response['code']) && isset($response['body']) && !isset($response['errno'])) {
            return [
                'success' => false,
                'error' => 'HTTP Request Failed: ' . ($response['error'] ?? $response['body']),
                'code' => $response['code']
            ];
        }

        // 检查滴滴业务错误码 (errno)
        if (isset($response['errno'])) {
            if ($response['errno'] != 0) {
                return [
                    'success' => false,
                    'error' => $response['errmsg'] ?? 'Unknown API error',
                    'errno' => $response['errno']
                ];
            }
            
            $data = $response['data'] ?? [];
            
            // 构造统一返回格式
            $result = [
                'success' => true,
                'data' => $data,
            ];
            
            // 提取关键字段到顶层，方便调用
            if (isset($data['authUrl'])) {
                $result['authUrl'] = $data['authUrl'];
            }
            if (isset($data['result'])) {
                $result['result'] = $data['result'];
            }
            
            return $result;
        }

        // 未知格式
        return [
            'success' => false,
            'error' => 'Invalid response format',
            'raw' => $response
        ];
    }
}