import axios, {
  AxiosInstance,
  AxiosResponse,
  AxiosError,
  InternalAxiosRequestConfig,
} from "axios";
import AsyncStorage from "@react-native-async-storage/async-storage";
import { Platform } from 'react-native';

import {
  API_BASE_URL,
  API_TIMEOUT,
  DEFAULT_HEADERS,
  STORAGE_KEYS,
} from "../../constants/config";
// import { Platform } from "react-native";

// 定义响应类型接口
export interface ApiResponse<T = any> {
  data: T;
  status: number;
  statusText: string;
  headers: any;
}

// 定义错误类型接口
export interface ApiError {
  message: string;
  status?: number;
  data?: any;
}

// 扩展 AxiosRequestConfig 类型
interface CustomAxiosRequestConfig extends InternalAxiosRequestConfig {
  retry?: number;
  retryDelay?: (retryCount: number) => number;
}

// 创建axios实例
const apiClient: AxiosInstance = axios.create({
  baseURL: API_BASE_URL,
  timeout: API_TIMEOUT,
  headers: DEFAULT_HEADERS,
  httpsAgent: Platform.OS === 'android' ? {
    // 强制使用兼容的TLS参数
    ciphers: [
      'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256',
      'TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256'
    ].join(':'),
    minVersion: 'TLSv1.2'
  } : undefined
});

// 请求拦截器
apiClient.interceptors.request.use(
  async (config: InternalAxiosRequestConfig) => {
    
    const baseUrl = config.baseURL || '';
    let fullUrl = baseUrl + config.url;
    if (config.params) {
      const params = new URLSearchParams(config.params);
      fullUrl += (fullUrl.includes('?') ? '&' : '?') + params.toString();
    }

    // 根据平台设置请求方法大小写
    if (config.method) {
      if (Platform.OS === 'ios') {
        // iOS使用小写方法
        config.method = config.method.toLowerCase();
      } else if (Platform.OS === 'android') {
        // Android使用大写方法
        config.method = config.method.toUpperCase();
      }
    }

    // console.log("环境:", __DEV__ ? "开发环境" : "生产环境");
    // console.log("请求方法:", config.method);
    // console.log("完整URL:", fullUrl);
    // console.log("请求头:", config.headers);
    // console.log("请求参数:", config.params);
    // console.log("请求数据:", config.data);

    // 从AsyncStorage获取token
    const token = await AsyncStorage.getItem("token");
    // 如果token存在，添加到请求头
    if (token && config.headers) {
      config.headers.Authorization = `${token}`;
    }
    return config;
  },
  (error: AxiosError) => {
    console.error("请求拦截器错误:", error);
    return Promise.reject(error);
  }
);

// 响应拦截器
apiClient.interceptors.response.use(
  (response: AxiosResponse) => {
    // 成功响应处理
    // console.log("响应成功:", {
    //   status: response.status,
    //   statusText: response.statusText,
    //   headers: response.headers,
    //   data: response.data,
    // });
    return response;
  },
  async (error: AxiosError<any>) => {
    // 错误响应处理
    const { response, config } = error;
    console.error("响应错误:", {
      url: config?.url,
      method: config?.method,
      message: error.message,
      code: error.code,
      stack: error.stack,
    });

    // 处理网络错误
    if (!response) {
      console.error("网络错误:", {
        message: error.message,
        code: error.code,
        stack: error.stack,
      });
      
      // 如果是网络错误，尝试重试
      const customConfig = config as CustomAxiosRequestConfig;
      if (customConfig && customConfig.retry) {
        customConfig.retry -= 1;
        if (customConfig.retry > 0) {
          const delay = customConfig.retryDelay ? customConfig.retryDelay(customConfig.retry) : 1000;
          console.log(`重试请求 (${customConfig.retry}): ${customConfig.url}`);
          await new Promise(resolve => setTimeout(resolve, delay));
          return apiClient(customConfig);
        }
      }
    }

    // 处理401错误 (未授权)
    if (response && response.status === 401) {
      console.log("未授权错误，清除token");
      await AsyncStorage.removeItem(STORAGE_KEYS.AUTH_TOKEN);
    }

    // 构建标准化的错误对象
    const apiError: ApiError = {
      message: error.message || "网络请求失败",
      status: response?.status,
      data: response?.data,
    };

    return Promise.reject(apiError);
  }
);

// API方法封装
export const apiService = {
  // GET请求
  async get<T>(url: string, params?: any, config?: any): Promise<T> {
    try {
      const customConfig: CustomAxiosRequestConfig = {
        ...config,
        retry: 3,
        retryDelay: (retryCount) => retryCount * 1000,
      };
      const response = await apiClient.get<T>(url, { params, ...customConfig });
      return response.data;
    } catch (error) {
      throw error;
    }
  },

  // POST请求
  async post<T>(url: string, data?: any, config?: any): Promise<T> {
    try {
      const customConfig: CustomAxiosRequestConfig = {
        ...config,
        retry: 3,
        retryDelay: (retryCount) => retryCount * 1000,
      };
      const response = await apiClient.post<T>(url, data, customConfig);
      return response.data;
    } catch (error) {
      throw error;
    }
  },

  // PUT请求
  async put<T>(url: string, data?: any, config?: any): Promise<T> {
    try {
      const customConfig: CustomAxiosRequestConfig = {
        ...config,
        retry: 3,
        retryDelay: (retryCount) => retryCount * 1000,
      };
      const response = await apiClient.put<T>(url, data, customConfig);
      return response.data;
    } catch (error) {
      throw error;
    }
  },

  // PATCH请求
  async patch<T>(url: string, data?: any, config?: any): Promise<T> {
    try {
      const customConfig: CustomAxiosRequestConfig = {
        ...config,
        retry: 3,
        retryDelay: (retryCount) => retryCount * 1000,
      };
      const response = await apiClient.patch<T>(url, data, customConfig);
      return response.data;
    } catch (error) {
      throw error;
    }
  },

  // DELETE请求
  async delete<T>(url: string, config?: any): Promise<T> {
    try {
      const customConfig: CustomAxiosRequestConfig = {
        ...config,
        retry: 3,
        retryDelay: (retryCount) => retryCount * 1000,
      };
      const response = await apiClient.delete<T>(url, customConfig);
      return response.data;
    } catch (error) {
      throw error;
    }
  },

  // 上传文件
  async upload<T>(url: string, formData: FormData, config?: any): Promise<T> {
    try {
      const uploadConfig = {
        headers: {
          "Content-Type": "multipart/form-data",
        },
        ...config,
      };

      const response = await apiClient.post<T>(url, formData, uploadConfig);
      return response.data;
    } catch (error) {
      throw error;
    }
  },

  // 并发请求
  async all<T>(requests: Promise<any>[]): Promise<T[]> {
    try {
      return await Promise.all(requests);
    } catch (error) {
      throw error;
    }
  },
};

export default apiService;