import Taro from '@tarojs/taro';
import cookie from 'cookie';
import environment from '../config';
import { getState } from '../store/globalState';

const { baseUrl, errorHandle, loadingHandle } = environment;

//当前请求个数
let requestingNumber = 0;

// request拦截器
function requestBuilder(method, url, data, config) {
  if (url.indexOf('token') == -1) {
    let token = getState('token') || Taro.getStorageSync('token');
    if (token) {
      url += url.indexOf('?') == -1 ? '?' : '&';
      url += `token=${token}`;
    }
  }
  if (url.indexOf('http') != 0) {
    url = baseUrl + url;
  }
  //通过config配置项控制跳过全局控制的loading显示
  let isShowLoading = true;
  let isShowErrorToast = true;
  if (config) {
    if (config.hideLoading) {
      isShowLoading = false;
    }
    if (config.hideErrorToast) {
      isShowErrorToast = false;
    }
  }
  /*
    同时触发两种加载状态
    并发多个请求时showLoading会在使用showToast时提前结束
    所以如果有多个并发请求,完成提示最好使用自定义的提示框而不是微信的
   */
  if (loadingHandle && isShowLoading) {
    Taro.showLoading({
      title: '加载中...',
      icon: 'none',
      mask: true
    });
    Taro.showNavigationBarLoading();
  }
  requestingNumber++;
  //请求结果处理
  function dealRequest() {
    requestingNumber--;
    if (requestingNumber === 0 && loadingHandle && isShowLoading) {
      Taro.hideLoading();
      Taro.hideNavigationBarLoading();
    }
  }
  //异常处理
  function dealError(errorInfo) {
    if (errorInfo && errorHandle && isShowErrorToast) {
      Taro.showToast({
        title: errorInfo,
        icon: 'none',
        duration: 1500
      });
    }
  }
  //给所有请求添加自定义header
  let userCookie = Taro.getStorageSync('cookie');
  let requestObj = {...config,url,method,data};
  if (userCookie) {
     requestObj.header= {
      cookie: cookie.serialize('fsiota', userCookie.fsiota) + ';' + cookie.serialize('fsiota.sig', userCookie.sig)
     }
  }
    return new Promise((resolved, rejected) => {
      Taro.request(requestObj).then(res => {
        dealRequest();
        if (res.statusCode == 401) {
          Taro.clearStorageSync();
          Taro.reLaunch({
            url: '/pages/auth/login/login'
          });
        }
        if (res.statusCode !== 200 && res.statusCode !== 204) {
          dealError(res.data.message || '请求出错');
        }
        resolved(res);
      }).catch(err => {
        dealRequest();
        dealError('网络异常');
        rejected(err);
      });
    });
  
}
export default {
  get: function (url, data, config) {
    return requestBuilder('GET', url, data, config);
  },
  post: (url, data, config ) => {
    return requestBuilder('POST', url, data, config);
  },
  put: (url, data, config = {} ) => {
    return requestBuilder('PUT', url, data, config);
  },
  del: (url, data, config) => {
    return requestBuilder('DELETE', url, data, config);
  } 
};