(function (root, factory) {
  // 请求工具封装 URL、Header 和响应解包，业务路径由 api-client 统一提供。
  if (typeof module === 'object' && module.exports) {
    module.exports = factory(root);
    return;
  }

  root.RequestUtil = factory(root);
})(typeof globalThis !== 'undefined' ? globalThis : window, function (root) {
  'use strict';

  function trimSlashes(value) {
    return String(value || '').replace(/^\/+|\/+$/g, '');
  }

  function joinUrl(baseUrl, path) {
    var base = String(baseUrl || '').replace(/\/+$/g, '');
    var cleanPath = '/' + trimSlashes(path);
    return base + cleanPath;
  }

  function appendQuery(url, query) {
    if (!query) return url;

    var params = new URLSearchParams();
    Object.keys(query).forEach(function (key) {
      var value = query[key];
      if (value === undefined || value === null || value === '') return;
      params.append(key, value);
    });

    var queryText = params.toString();
    return queryText ? url + '?' + queryText : url;
  }

  function isFormData(body) {
    return typeof FormData !== 'undefined' && body instanceof FormData;
  }

  function createHttpError(message, detail) {
    var error = new Error(message);
    Object.keys(detail || {}).forEach(function (key) {
      error[key] = detail[key];
    });
    return error;
  }

  async function parseJson(response) {
    try {
      return await response.json();
    } catch (error) {
      return null;
    }
  }

  function unwrapResponse(payload) {
    if (!payload || typeof payload !== 'object') return payload;

    if (payload.code !== undefined && payload.code !== 200) {
      throw createHttpError(payload.msg || '接口请求失败', {
        code: payload.code,
        response: payload
      });
    }

    if (Object.prototype.hasOwnProperty.call(payload, 'data')) return payload.data;
    if (Object.prototype.hasOwnProperty.call(payload, 'rows')) {
      return {
        rows: payload.rows,
        total: payload.total
      };
    }

    return payload;
  }

  function createRequester(options) {
    var settings = options || {};
    var fetchImpl = settings.fetchImpl || root.fetch;

    return async function request(method, path, requestOptions) {
      var req = requestOptions || {};
      var headers = Object.assign({}, req.headers || {});
      var token = settings.getToken ? settings.getToken() : '';
      var tokenHeaderName = settings.tokenHeaderName || 'Authorization';
      var url = appendQuery(joinUrl(settings.baseUrl, path), req.query);
      var body = req.body;

      headers.clientid = settings.clientId;
      if (token && req.auth !== false) headers[tokenHeaderName] = 'Bearer ' + token;

      if (body !== undefined && body !== null && !isFormData(body)) {
        headers['Content-Type'] = headers['Content-Type'] || 'application/json';
        body = JSON.stringify(body);
      }

      var response = await fetchImpl(url, {
        method: method,
        headers: headers,
        body: body
      });
      var payload = await parseJson(response);

      if (!response.ok) {
        throw createHttpError((payload && payload.msg) || '接口请求失败', {
          status: response.status,
          response: payload
        });
      }

      return unwrapResponse(payload);
    };
  }

  return {
    createRequester: createRequester,
    joinUrl: joinUrl,
    appendQuery: appendQuery
  };
});