import userDataStorage from './userDataStorage';
import Consts from './Consts';

class WinBoxAPI {
  constructor() {}

  static whenAjaxResponse(httpRequest, callback) {
    if (httpRequest.readyState != 4) {
			return;
		}
    try {
		  let res = JSON.parse(httpRequest.responseText);
		  callback(httpRequest.status == 200, res);
    }
    catch(err) {
      callback(false, {});
    }
  }

  static baseRequest(method, path, params, callback) {
		let xmlHttpReq = new XMLHttpRequest();

		let sendBody = null;
    let url = `${Consts.NODE_SERVER}${path}?`;
    if (method === 'GET') {
      for (let key in params) {
        url += `${key}=${params[key]}&`;
      }
    }
		if (params && (method == 'POST' || method == 'PUT')) {
			sendBody = JSON.stringify({...params});
		}
		xmlHttpReq.open(method, url, true);
		xmlHttpReq.onreadystatechange = function () {
			WinBoxAPI.whenAjaxResponse(xmlHttpReq, callback);
		};
		xmlHttpReq.send(sendBody);
  }

  static get(path, params, callback) {
    WinBoxAPI.baseRequest('GET', path, params, callback);
  }

  static post(path, params) {
    WinBoxAPI.baseRequest('POST', path, params, callback);
  }

  static postDownloadRequest(lessonId, courseId, callback) {
		const { token = '', uid = '', eid = '' } = userDataStorage.getData() || {};
    let path = '/lesson/downloadFile';
    let params = { lessonId, courseId, uid, eid, token };
    WinBoxAPI.get(path, params, callback);
  }

  //获取mac地址
  static getMacUrl(callback) {
    let path = '/lesson/getMac';
    WinBoxAPI.get(path, {}, callback);
  }

  static deleteDownloadFile(lessonId, courseId, callback) {
		const { token = '', uid = '', eid = '' } = userDataStorage.getData() || {};
    let path = '/lesson/delFile';
    let params = { lessonId, courseId, uid, eid, token };
    WinBoxAPI.get(path, params, callback);
  }
}

module.exports = WinBoxAPI;