// 对象转为路径参数
export const objToUrlParams = (obj) => {
  if (typeof obj === "string") return obj;
  let result = "?";
  for (const element in obj) {
    result += `${element}=${obj[element]}&`;
  }
  return result.substring(0, result.length - 1);
};

// 将字符串转为对象
export const urlParamsToObj = (url) => {
  const params = url.split("?")[1];
  if (!params) return {};
  const paramsArr = params.split("&");
  const result = {};
  paramsArr.forEach((item) => {
    const [key, value] = item.split("=");
    result[key] = value;
  });
  return result;
};

// 参数归一化路由参数
const normalizeParams = (url, options) => {
  let normalizeOptions = {
    url: "",
  };
  if (typeof url === "string") {
    normalizeOptions = {
      url,
      ...options,
    };
  } else {
    normalizeOptions = url;
  }
  const params = {
    redirected: getRoute().routeList[0].path,
    ...normalizeOptions.params,
  };
  normalizeOptions.url += objToUrlParams(params);
  delete normalizeOptions.params;
  return normalizeOptions;
};

// 路由映射表
export const router = {
  /**
   * 保留当前页面，跳转到应用内的某个页面。但是不能跳到 tabbar 页面。
   */
  push(url, options) {
    const normalizeOptions = normalizeParams(url, options);
    uni.navigateTo(normalizeOptions);
  },
  /**
   * 关闭当前页面，跳转到应用内的某个页面。但是不允许跳转到 tabbar 页面。
   */
  redirectTo(url, options) {
    const normalizeOptions = normalizeParams(url, options);
    uni.redirectTo(normalizeOptions);
  },
  /**
   * 关闭所有页面，打开到应用内的某个页面。
   */
  reLaunch(url, options) {
    const normalizeOptions = normalizeParams(url, options);
    uni.reLaunch(normalizeOptions);
  },
  /**
   * 跳转到 tabBar 页面，并关闭其他所有非 tabBar 页面
   */
  switchTab(url, options) {
    const normalizeOptions = normalizeParams(url, options);
    uni.switchTab(normalizeOptions);
  },
  /**
   * 关闭当前页面，返回上一页面或多级页面。
   */
  back() {
    const route = getRoute().routeList;
    if (route.length > 1) {
      uni.navigateBack();
      return;
    }
    const { redirected, ...params } = route[0].params;
    if (redirected) {
      this.reLaunch({
        url: `/${redirected}`,
        params,
      });
    }
  },
};

// 获取当前路由参数
export const getRoute = () => {
  const pages = getCurrentPages();
  const routeList = pages
    .map((item, index) => {
      // 处理路径乱码问题

      // 解决乱码问题
      for (const param in item.options) {
        item.options[param] = decodeURIComponent(item.options[param]);
      }

      return {
        params: item.options,
        path: item.route,
        index,
      };
    })
    .reverse();
  return {
    routeList,
    params: routeList[0].params,
  };
};