// Axios客户端实例(仅注入JWT Token，factory_id由后端从Token提取)

import axios from 'axios';
import type { AxiosInstance } from 'axios';
import { getSessionStorage, removeSessionStorage, setSessionStorage, STORAGE_KEYS } from '@smartcut/shared-utils';

export interface ApiClientConfig {
  baseURL: string;
  tokenKey: string; // sessionStorage中的token键名
}

/**
 * 创建API客户端实例
 * factory_id 不再由前端传递，后端通过 JWT Token 自动提取
 */
export function createApiClient(config: ApiClientConfig): AxiosInstance {
  const instance = axios.create({
    baseURL: config.baseURL,
    timeout: 30000,
    headers: {
      'Content-Type': 'application/json'
    }
  });

  // 请求拦截器：仅注入JWT Token
  instance.interceptors.request.use(
    (requestConfig) => {
      const token = getSessionStorage<string>(config.tokenKey);
      if (token) {
        requestConfig.headers.Authorization = `Bearer ${token}`;
      }
      return requestConfig;
    },
    (error) => Promise.reject(error)
  );

  // 响应拦截器:Token续期 + 业务错误码处理 + 401处理
  instance.interceptors.response.use(
    (response) => {
      const newToken = response.headers['x-new-token'];
      if (newToken) {
        setSessionStorage(config.tokenKey, newToken);
      }
      // 后端对业务错误返回 HTTP 200 + code!=0，此处统一转为 rejected，
      // 让各视图的 catch 块能正确显示错误信息
      const body = response.data;
      if (body && typeof body === 'object' && typeof body.code === 'number' && body.code !== 0) {
        const err = new Error(body.msg || '请求失败');
        (err as any).code = body.code;
        (err as any).response = response;
        return Promise.reject(err);
      }
      return response;
    },
    (error) => {
      if (error.response?.status === 401) {
        // 401时仅清除Token，保留factory_id便于重新登录同一工厂
        removeSessionStorage(config.tokenKey);
        const factoryId = getSessionStorage<string>(STORAGE_KEYS.CURRENT_FACTORY_ID);

        // P2: 保存当前路径，登录后返回原页面；redirect 仅允许相对路径，防开放重定向
        const currentPath = window.location.pathname + window.location.search;
        const isSafeRedirect = currentPath.startsWith('/') && !currentPath.startsWith('//') && !currentPath.startsWith('/login');
        const base = isSafeRedirect
          ? '/login?redirect=' + encodeURIComponent(currentPath)
          : '/login';
        const factoryParam = factoryId ? '&factory=' + encodeURIComponent(factoryId) : '';
        window.location.href = base + factoryParam;
      }
      return Promise.reject(error);
    }
  );

  return instance;
}