// 根据小程序版本自动选择后端地址
function _getBaseUrls() {
  let envType = 'release';
  try {
    const accountInfo = wx.getAccountInfoSync();
    envType = accountInfo.miniProgram.envVersion || 'release';
  } catch (e) {
    // 低版本基础库不支持时默认线上环境
    envType = 'release';
  }
  switch (envType) {
    case 'develop':
      // 开发版：本地服务
      return {
        baseUrl: 'https://test.muguaclub.cn/clock',
        staticUrl: 'https://test.muguaclub.cn',
        h5Url: 'https://test.muguaclub.cn'
      };
    case 'trial':
      // 体验版：测试环境
      return {
        baseUrl: 'https://test.muguaclub.cn/clock',
        staticUrl: 'https://test.muguaclub.cn',
        h5Url: 'https://test.muguaclub.cn'
      };
    case 'release':
    default:
      // 线上版：正式环境
      return {
        baseUrl: 'https://m.muguaclub.cn/clock',
        staticUrl: 'https://m.muguaclub.cn',
        h5Url: 'https://m.muguaclub.cn'
      };
  }
}

const _urls = _getBaseUrls();
const BASE_URL = _urls.baseUrl;
const STATIC_BASE_URL = _urls.staticUrl;
const H5_BASE_URL = _urls.h5Url;

let redirectingProfile = false;

function goProfile() {
  if (redirectingProfile) {
    return;
  }
  const pages = getCurrentPages();
  const current = pages.length ? pages[pages.length - 1] : null;
  const route = current && current.route;
  if (route === 'pages/profile/profile') {
    return;
  }
  redirectingProfile = true;
  wx.switchTab({
    url: '/pages/profile/profile',
    complete() {
      setTimeout(() => {
        redirectingProfile = false;
      }, 1200);
    }
  });
}

function request(options) {
  const { url, method = 'GET', data = {}, auth = true } = options;
  const isIdempotent = method === 'GET' || method === 'DELETE';
  let retried = false;

  return new Promise((resolve, reject) => {
    const doRequest = () => {
      const header = { 'Content-Type': 'application/json' };
      const token = wx.getStorageSync('token');
      if (auth && token) {
        header['Authorization'] = 'Bearer ' + token;
      }
      wx.request({
        url: BASE_URL + url,
        method,
        data,
        header,
        success(res) {
          if (res.statusCode >= 200 && res.statusCode < 300) {
            resolve(res.data);
          } else if (res.statusCode === 401) {
            wx.removeStorageSync('token');
            if (auth) {
              goProfile();
            }
            reject(res.data || { error: '未登录' });
          } else {
            reject(res.data || { error: '请求失败' });
          }
        },
        fail(err) {
          // 冷启动时首个请求可能因网络栈未就绪而失败，空闲时对幂等请求自动重试一次
          const msg = (err && err.errMsg) || '';
          const domainError = /url not in domain list|domain not/i.test(msg);
          if (!retried && isIdempotent && !domainError) {
            retried = true;
            setTimeout(doRequest, 800);
            return;
          }
          reject(err);
        }
      });
    };
    doRequest();
  });
}

/**
 * 把计划附件的相对路径转为完整的静态资源 URL。
 * 路径格式：attachments/{user_id}/{plan_type}/{period_key}/{filename}
 */
function planFileUrl(path) {
  if (!path) return '';
  if (/^https?:\/\//i.test(path)) return path;
  const parts = String(path).replace(/^attachments\//, '').split('/');
  if (parts.length < 4) return '';
  return STATIC_BASE_URL + '/clock/static/plan/' + parts.slice(0, 4).map(encodeURIComponent).join('/');
}

module.exports = { request, planFileUrl, BASE_URL, STATIC_BASE_URL, H5_BASE_URL };