// @/utils/request.js
let isRedirectingToLogin = false;

// 全局 SSO 处理标记（挂载到 uni 上，便于跨模块共享）
uni.__isSSOHandling = false;

const showToast = (message) => {
  if (uni.$u?.toast) {
    uni.$u.toast(message);
  } else {
    uni.showToast({ title: message, icon: "none" });
  }
};

const config = {
  baseURL: "/api",
  timeout: 60000,
  header: {
    "Content-Type": "application/json",
    "X-Business-System": "medical-system",
  },
  loginPage: "/pages/login/Login",
  tokenExpiredCode: 401,
  noPermissionCode: 403,
  whiteList: ["/login", "/getToken", "/GiLink/getCode"],
};

const isInWhiteList = (url) => {
  const relativeUrl = url.replace(config.baseURL, "").split("?")[0];
  return config.whiteList.some((path) => {
    if (path.endsWith("/")) return relativeUrl.startsWith(path);
    return relativeUrl === path;
  });
};

const navigateToLogin = () => {
  // SSO 处理中，不重复跳转
  if (isRedirectingToLogin || uni.__isSSOHandling) {
    console.log("正在跳转登录页或SSO处理中，跳过");
    return;
  }

  isRedirectingToLogin = true;

  const pages = getCurrentPages();
  const currentPage = pages[pages.length - 1];
  const isLoginPage =
    currentPage &&
    currentPage.route &&
    currentPage.route.includes("login/Login");

  if (isLoginPage) {
    console.log("当前已在登录页，不跳转");
    isRedirectingToLogin = false;
    return;
  }

  console.log("跳转到登录页");
  setTimeout(() => {
    uni.redirectTo({
      url:
        config.loginPage +
        "?redirect=" +
        encodeURIComponent(getCurrentPagePath()),
      success: () => {
        console.log("跳转登录页成功");
        isRedirectingToLogin = false;
      },
      fail: () => {
        console.log("跳转登录页失败");
        isRedirectingToLogin = false;
      },
    });
  }, 100);
};

const getCurrentPagePath = () => {
  const pages = getCurrentPages();
  return pages[pages.length - 1]?.route || "";
};

const checkTokenExpired = (statusCode) => {
  if (statusCode === config.tokenExpiredCode) {
    showToast("登录已过期，请重新登录");
    navigateToLogin();
    return true;
  }
  return false;
};

const requestInterceptor = (options) => {
  const token = uni.getStorageSync("token");

  if (isInWhiteList(options.url)) {
    console.log("白名单接口，跳过token校验:", options.url);
    return options;
  }

  if (!token) {
    const pages = getCurrentPages();
    const currentPage = pages[pages.length - 1];
    const isLoginPage =
      currentPage &&
      currentPage.route &&
      (currentPage.route.includes("login/Login") ||
        currentPage.route.includes("login/DingTalkLogin"));

    if (isLoginPage) {
      console.log("当前是登录页，允许无token请求");
      return options;
    }

    console.log("未登录且不在登录页，跳转到登录页");
    navigateToLogin();
    throw new Error("未登录");
  }

  options.header = {
    ...options.header,
    Authorization: `Bearer ${token}`,
  };
  return options;
};

const responseInterceptor = (response) => {
  const { statusCode, data } = response;
  if (checkTokenExpired(statusCode)) return Promise.reject(data);
  if (statusCode === config.noPermissionCode) {
    showToast("无权限访问");
    return Promise.reject(data);
  }
  if (statusCode !== 200) {
    showToast(`请求失败: ${statusCode}`);
    return Promise.reject(data);
  }
  if (data?.code !== 200) {
    showToast(data?.msg || "操作失败");
    return Promise.reject(data);
  }
  return data;
};

const request = async (options) => {
  try {
    options = {
      ...config,
      ...options,
      url: config.baseURL + options.url,
      header: { ...config.header, ...options.header },
    };
    options = await requestInterceptor(options);
    return new Promise((resolve, reject) => {
      uni.request({
        ...options,
        success: (res) => resolve(responseInterceptor(res)),
        fail: (err) => {
          showToast("网络错误，请重试");
          reject(err);
        },
      });
    });
  } catch (err) {
    return Promise.reject(err);
  }
};

const http = {
  get(url, data = {}, options = {}) {
    return request({ url, data, method: "GET", ...options });
  },
  post(url, data = {}, options = {}) {
    return request({ url, data, method: "POST", ...options });
  },
  put(url, data = {}, options = {}) {
    return request({ url, data, method: "PUT", ...options });
  },
  delete(url, data = {}, options = {}) {
    return request({ url, data, method: "DELETE", ...options });
  },
  upload(url, filePath, name = "file", formData = {}) {
    return request({
      url,
      method: "POST",
      filePath,
      name,
      formData,
      header: { "Content-Type": "multipart/form-data" },
    });
  },
};

uni.$uapi = http;
export default http;