var request = require('request');
var cryptoJS = require("crypto-js");
var mac = require('getmac');//获取mac地址

var macAddressStr = "";
//获取机器mac地址
mac.getMac(function(err,macAddress){
    if (err)  throw err;
    macAddressStr = macAddress; //获取mac地址
});


/**
 * The helper of api
 */
class LjApiHelper
{
    /**
     * Gets the API for query course
     * @param lessonId the lesson id
     * @param courseId the course id
     * @param eid the eid
     * @returns {string} the API url
     */
    static getApiForQueryCourse(lessonId, courseId, eid)
    {
        var http = "http://tt-web.api.ai160.com/lesson/" + lessonId;
        http += "?courseId=" + courseId
        http += "&eid=" + eid
        http += "&cache=true";

        return http;
    }

    /**
     * Gets the API for add download
     * @param lessonId the lesson id
     * @param data the data
     * @returns {string}
     */
    static getApiForAddDownload(lessonId,courseId,resTotal,data)
    {
        return "http://tt-web.api.ai160.com/callback/download/add?lessonId=" + lessonId+"&courseId="+courseId+"&resTotal="+resTotal+"&resSize=0&mac="+macAddressStr;
    }

    /**
     * Gets the API for delete download
     * @param lessonId the lesson id
     * @param data the data
     * @returns {string}
     */
    static getApiForDelDownload(lessonId,data)
    {
        return "http://tt-web.api.ai160.com/callback/download/delete?lessonId=" + lessonId+"&mac="+macAddressStr+"&data="+data;
    }

    /**
     * Gets the API for update resource size
     * @param lessonId the lesson id
     * @returns {string}
     */
    static getApiForUpdateResSize(lessonId)
    {
        return "http://tt-web.api.ai160.com/callback/download/update/resource/size?lessonId=" + lessonId+"&mac="+macAddressStr;
    }
}

module.exports = LjApiHelper;