import axios from 'axios';
import type { AxiosInstance, AxiosRequestConfig, AxiosResponse } from 'axios';
import { envConfig } from '../config/env';

// Token 存储键名（与 auth service 保持一致）
const TOKEN_KEY = 'access_token';

// 创建 axios 实例
const apiClient: AxiosInstance = axios.create({
    baseURL: envConfig.apiBaseUrl,
    timeout: 30000, // 30秒超时
    headers: {
        'Content-Type': 'application/json',
    },
});

// 请求拦截器
apiClient.interceptors.request.use(
    (config) => {
        // 自动添加 token 到请求头
        const token = localStorage.getItem(TOKEN_KEY);
        if (token) {
            config.headers.Authorization = `Bearer ${token}`;
        }

        if (envConfig.debug) {
            console.log('请求:', config.method?.toUpperCase(), config.url);
        }

        return config;
    },
    (error) => {
        if (envConfig.debug) {
            console.error('请求错误:', error);
        }
        return Promise.reject(error);
    }
);

// 响应拦截器
apiClient.interceptors.response.use(
    (response: AxiosResponse) => {
        if (envConfig.debug) {
            console.log('响应:', response.config.url, response.data);
        }
        return response;
    },
    (error) => {
        if (envConfig.debug) {
            console.error('响应错误:', error.response?.data || error.message);
        }

        // 处理常见错误
        if (error.response) {
            switch (error.response.status) {
                case 401:
                    // 未授权，清除 token 并跳转到登录页
                    localStorage.removeItem(TOKEN_KEY);
                    localStorage.removeItem('user_info');
                    // 避免在登录页重复跳转
                    if (window.location.pathname !== '/login') {
                        window.location.href = '/login';
                    }
                    break;
                case 403:
                    console.error('没有权限访问该资源');
                    break;
                case 404:
                    console.error('请求的资源不存在');
                    break;
                case 500:
                    console.error('服务器内部错误');
                    break;
                default:
                    console.error('请求失败:', error.response.data?.message || error.message);
            }
        } else if (error.request) {
            console.error('网络错误，请检查网络连接');
        }

        return Promise.reject(error);
    }
);

// 导出常用的请求方法
export const api = {
    get: <T = any>(url: string, config?: AxiosRequestConfig) =>
        apiClient.get<T>(url, config).then((res) => res.data),

    post: <T = any>(url: string, data?: any, config?: AxiosRequestConfig) =>
        apiClient.post<T>(url, data, config).then((res) => res.data),

    put: <T = any>(url: string, data?: any, config?: AxiosRequestConfig) =>
        apiClient.put<T>(url, data, config).then((res) => res.data),

    patch: <T = any>(url: string, data?: any, config?: AxiosRequestConfig) =>
        apiClient.patch<T>(url, data, config).then((res) => res.data),

    delete: <T = any>(url: string, config?: AxiosRequestConfig) =>
        apiClient.delete<T>(url, config).then((res) => res.data),
};

// 导出 axios 实例（用于特殊需求）
export default apiClient;