// ==UserScript==
// @name         中国大学mooc数据劫持高清
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.icourse163.org/learn/*
// @icon         https://www.google.com/s2/favicons?domain=undefined.
// @grant        none
// ==/UserScript==
var oldxhr=window.XMLHttpRequest
function newobj(){}

window.XMLHttpRequest=function(){
    let tagetobk=new newobj();
    tagetobk.oldxhr=new oldxhr();
    let handle={
        get: function(target, prop, receiver) {
            if(prop==='oldxhr'){
                return Reflect.get(target,prop);
            }
            if(typeof Reflect.get(target.oldxhr,prop)==='function')
            {
                if(Reflect.get(target.oldxhr,prop+'proxy')===undefined)
                {
                    target.oldxhr[prop+'proxy']=new Proxy(Reflect.get(target.oldxhr,prop), {
                        apply: function(target, thisArg, argumentsList) {
                            return Reflect.apply(target, thisArg.oldxhr, argumentsList);
                        }
                    });

                }
                return Reflect.get(target.oldxhr,prop+'proxy')
            }
            if(prop.indexOf('response')!==-1)
            {
                let result=Reflect.get(target.oldxhr,prop)
                if(target.oldxhr.responseURL.indexOf('/v1/vod/video?videoId=')!==-1&&result.indexOf!==undefined&&result.indexOf('videoUrl')!==-1&&result.indexOf('quality')!==-1){
                    let jstext=JSON.parse(result)
                    if(jstext.result!==undefined&&jstext.result.videos!==undefined){
                        let fucktext=[]
                        let main={
                            url:'',
                            quality:-999
                        }
                        for(let index=0;index<jstext.result.videos.length;index++){

                            let item=jstext.result.videos[index]
                                                    console.log('item',item.quality,main.quality)
                            if(item.quality>main.quality){
                                main.quality=item.quality
                                main.url=item.videoUrl
                            }
                        }
                        console.log('main',main)
                        for(let index=0;index<jstext.result.videos.length;index++){
                            let item=jstext.result.videos[index]
                            if(item.videoUrl!==main.url){
                                console.log('replace',item.videoUrl,main.url)
                                result=result.replace(item.videoUrl,main.url)
                            }
                        }
                        console.log('result1',result)
                        return result


                    }
                }
                return result
            }
            return Reflect.get(target.oldxhr,prop);
        },
        set(target, prop, value) {
            return Reflect.set(target.oldxhr, prop, value);
        },
        has(target, key) {
            debugger;
            return Reflect.has(target.oldxhr,key);
        }
    }

    let ret = new Proxy(tagetobk, handle);

    return ret;
}