// ==UserScript==
// @name         Direct download from Google Play
// @namespace    StephenP
// @version      2.8.1
// @description  Adds APK-DL, APKPure, APKCombo, APKMirror and Evozi download buttons to Google Play when browsing apps. This script is based on yurenchen's "google play apk downloader".
// @author       StephenP
// @icon https://play.google.com/favicon.ico
// @match        https://play.google.com/*
// @match        http://play.google.com/*
// @match        http://apkfind.com/store/captcha?app=*
// @grant        GM.xmlHttpRequest
// @grant        GM.download
// @require      https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js
// @connect      self
// @connect      apkpure.com
// @connect      apkfind.com
// @connect      apk-cloud.com
// @connect      winudf.com
// @connect      apkcombo.com
// @connect      gpudf.down-apk.com
// @connect      play.googleapis.com
// @connect      gvt1.com
// @downloadURL none
// ==/UserScript==
var ui;
var wlButton;
var pageURL;
var title;
var appCwiz;
var done=[0];
var useGS=false;
(function() {
  if(document.location.href.includes("apkfind")===true){
    setInterval(unredirect,100);
  }
  else{
    try{
      'use strict';
      var site=window.location.href.toString();
      ui=checkUI();
      pageURL=location.href;
      if(ui>0){
      	title=document.getElementById("main-title").innerHTML;
      }
      if(ui>=3){
        var buttonsStyle=document.createElement("style");
        var styleString='.ddlButton:visited{color: white;} .ddlButton:hover{opacity: 0.8;} .ddlButton:active{opacity: 0.6;} .ddlButton{color: white; border-radius: 4px; border: 1px; font-size: 14px; height: 46px; padding: 9px 20px; font-weight: 500; font-family: "Roboto",sans-serif; position: relative; text-align: center; line-height: 46px;';
        if(ui==3){
          styleString+=' margin-right: 4px;}';
          buttonsStyle.innerHTML=styleString;
        }
        if(ui==4){
          styleString+=' margin-left: 4px;}';
          buttonsStyle.innerHTML=styleString;
        }
        document.body.appendChild(buttonsStyle);
      }
      if(pageURL.includes("details?id=")){
        addButtons();
      }
      setInterval(checkReload, 2000);
    }
    catch(err){
      console.log("main(): "+err);
    }
	}
})();
function unredirect(){
    var tot=document.body.children.length-1;
    if(parseInt(document.body.children[tot].style.zIndex, 10)>2){
      if(document.body.children[tot].id==""){
        document.body.children[tot].style.zIndex="1";
        document.body.children[tot-1].style.zIndex="-1000";
      }
      else{
        document.body.children[tot].style.zIndex="-1000";
      }
    }
}
function waitForRemovingButtons(){
    //if(title!=document.getElementById("main-title").innerHTML){
  	if((pageURL!=location.href)||(isButtonVisible()===false)){
        title=document.getElementById("main-title").innerHTML;
        pageURL=location.href;
        wlButton=null;
        if(location.href.includes("details?id=")){
            if((ui>=3)&&(document.getElementsByClassName("ddlButton").length>0)){
              	try{
                	removePreviousCwiz();
                }
              	catch(err){
                  console.log(err+"; I was probably just trying to remove buttons that weren't there...");
                }
            }
            addButtons();
        }
    }
    else{
        setTimeout(waitForRemovingButtons, 1000);
    }
}
function checkReload(){
    if((pageURL!=location.href)||(isButtonVisible()===false)){
            waitForRemovingButtons();
    }
}
function isButtonVisible(){
  var allButtons=document.getElementsByClassName("ddlButton");
  //console.log("how many buttons: "+allButtons.length);
  if(allButtons.length>0){
    for(var i=0;i<allButtons.length;i++){
      if(allButtons[i].offsetParent!=null){
        //console.log(i+true);
        return true;
      }
    }
    //console.log(i+false);
    return false;
  }
  else{
    if(document.location.href.includes("play.google.com/store/apps/details")){
      console.log("apppage//"+false);
      return false;
    }
    //console.log("notapppage//"+false);
    return true;
  }
}
function addButtons(){
    var price=-1;
    var installButton=null;
    var instWishButtons=[];
    if((ui<=2)&&(ui>0)){
        installButton=document.getElementsByClassName("buy")[0];
      	try{
        	price=installButton.firstElementChild.firstElementChild.getElementsByTagName("META")[1].content;
          //alert("Price: "+price);
        }
        catch(err){
          console.error("Price not found. Maybe the app is already installed?");
          price=0;
        }
    }
    else if(ui>2){
        instWishButtons=getUglyUIButtons();
        if(ui==3){
        	installButton=instWishButtons[0];
        }
        else{
          installButton=instWishButtons[1];     //if the app is installed, the whishlist button is absent, so the install button is the first and only
          if(typeof installButton==='undefined'){
            installButton=instWishButtons[0];
          }
        }
        do{
            installButton=installButton.parentNode;
        }while(installButton.tagName!="C-WIZ");
        try{
      		price=installButton.firstElementChild.firstElementChild.getElementsByTagName("META")[1].content;
          //alert("Price: "+price);
        }
      	catch(err){
          console.error("Price not found. Maybe the app is already installed?");
          price=0;
        }
        //determina c-wiz dell'app per poterlo radere al suolo al cambio di pagina
        var currentNode;
        currentNode=installButton.parentNode;
        do{
            if(currentNode.tagName=="C-WIZ"){
                appCwiz=currentNode;
            }
            currentNode=currentNode.parentNode;
        }while(currentNode.tagName!="BODY");
    }
  	else{
      document.getElementById("search-section").lastChild.remove();
      document.getElementById("search-section").innerHTML+='<span style="margin-top: 32px; float: left">or search on </span><span><a href="https://www.apkmirror.com/?post_type=app_release&searchtype=apk&s='+location.search.match(/id=(.*)/)[1].split("&", 1)+'" class="rounded" style="background-color: #FF8B14; font-weight: bold; text-decoration: none; padding: 1em; margin: 17px; float: left; color: white;">APKMirror</a></span><div style="clear:both"></div>';
    }
        if(price==0){
            var html;
            var buttonslist;
            var id=location.search.match(/id=(.*)/)[1].split("&", 1);
            var apkpureURL='https://m.apkpure.com/genericApp/'+id+'/download';
            var evoziURL='https://apps.evozi.com/apk-downloader/?id='+id;
            var apkdlURL='http://apkfind.com/store/download?id='+id;
            var apkmirrorURL='https://www.apkmirror.com/?post_type=app_release&searchtype=apk&s='+id;
            var apkleecherURL='https://apkleecher.com/download/dl.php?dl='+id;
            var apkcomboURL='https://apkcombo.com/genericApp/'+id+'/download/apk';
            wlButton = document.createDocumentFragment();
            var wishListButton;
            if(ui<=2){
                wishListButton=document.getElementsByClassName("id-wishlist-display")[0];
            }
            else{
              if(typeof instWishButtons[1]!=='undefined'){
                wishListButton=instWishButtons[0];
                do{
                    wishListButton=wishListButton.parentNode;
                }while(wishListButton.tagName!="C-WIZ");
              }
            }
            if(ui==1){
                buttonslist = document.getElementsByClassName("details-actions")[0];
                html='<span id="apkdlbutton"><a style="background-color: #009688" class="medium play-button download-apk-button apps ">APK&#x2011;DL</a></span><span id="apkpurebutton"><a style="background-color: #24cd77" class="medium play-button download-apk-button apps ">APKPure</a></span><span id="apkcombobutton"><a style="background-color: #00875f" class="medium play-button download-apk-button apps ">APKCombo</a></span><br><span><a href="'+evoziURL+'" style="background-color: #286090" class="medium play-button download-apk-button apps ">Evozi</a></span><span><a href="'+apkmirrorURL+'" style="background-color: #FF8B14" class="medium play-button download-apk-button apps ">APKMirror</a></span><br><input type="checkbox" id="useGoogleServers" name="useGoogleServers" value="useGoogleServers"/>Use Google\'s servers when downloading from APKCombo';
            }
            else if(ui==2){
                buttonslist = document.getElementsByClassName("details-actions-right")[0];
                html='<span id="apkdlbutton"><a style="background-color: #009688" class="large play-button download-apk-button apps ">APK&#x2011;DL</a></span><span id="apkpurebutton"><a style="background-color: #24cd77" class="large play-button download-apk-button apps ">APKPure</a></span><span id="apkcombobutton"><a style="background-color: #00875f" class="large play-button download-apk-button apps ">APKCombo</a></span><br><span><a href="'+evoziURL+'" style="background-color: #286090" class="large play-button download-apk-button apps ">Evozi</a></span><span><a href="'+apkmirrorURL+'" style="background-color: #FF8B14" class="large play-button download-apk-button apps ">APKMirror</a></span><br><input type="checkbox" id="useGoogleServers" name="useGoogleServers" value="useGoogleServers"/>Use Google\'s servers when downloading from APKCombo';
            }
            else{
                buttonslist = installButton.parentNode;
                html='<span id="apkdlbutton"><a style="background-color: #009688" class="ddlButton">APK&#x2011;DL</a></span><span id="apkpurebutton"><a style="background-color: #24cd77" class="ddlButton">APKPure</a></span><span id="apkcombobutton"><a style="background-color: #00875f" class="ddlButton">APKCombo</a></span><br><span><a href="'+evoziURL+'" style="background-color: #286090" class="ddlButton">Evozi</a></span><span><a href="'+apkmirrorURL+'" style="background-color: #FF8B14" class="ddlButton">APKMirror</a></span><br><input type="checkbox" id="useGoogleServers" name="useGoogleServers" value="useGoogleServers"/>Use Google\'s servers when downloading from APKCombo';
            }
            if(ui<=2){
              wlButton.appendChild(wishListButton);
            }
            else{
              if(typeof wishListButton!=='undefined'){
              	wlButton.appendChild(wishListButton.firstChild.firstChild);
              }
            }
            buttonslist.innerHTML=buttonslist.innerHTML+html;
            buttonslist.appendChild(wlButton);

            var ddlButton1=document.getElementById("apkdlbutton");
            ddlButton1.onclick=function(){ddl(this,apkdlURL);};
          	var ddlButton2=document.getElementById("apkpurebutton");
            ddlButton2.onclick=function(){ddl(this,apkpureURL);};
          	var ddlButton3=document.getElementById("apkcombobutton");
            ddlButton3.onclick=function(){ddl(this,apkcomboURL);};
          	document.getElementById("useGoogleServers").checked=useGS;
        }
}
function openLink(link){
  window.open(link.replace("http://","https://"),"_self");
}
function ddlFinalApk(link,ddlButton,i){
  if(link!=""){
     done[i]=0;
     GM.xmlHttpRequest({
        method: "GET",
        url: link,
        timeout: 5000,
        ontimeout: function(response) {
          if(done[i]==0){
            ddlButton.firstChild.innerHTML="Retry";
          }
          else{
            done[i]=0;
          }
        },
       onprogress: function(response){
          //console.log(response.finalUrl);
         if((response.finalUrl.includes("winudf.com"))||(response.finalUrl.includes("down-apk.com"))||(response.finalUrl.includes("/play-apps-download-default/"))){
           if(done[i]==0){
             console.log("downloading file n."+i);
             done[i]=1;
             if(link.includes("apkpure")){
               window.open(response.finalUrl,"_self");
               ddlButton.onclick=function(){openLink(response.finalUrl);};
               ddlButton.firstChild.innerHTML="Ready!";
             }
             else{
               window.open(response.finalUrl,i);
               ddlButton.firstChild.innerHTML="APKCombo";
             }
           }
         }
        },
       	onload: function(response){
       		if(done[i]==0){
            ddlButton.firstChild.innerHTML="Retry";
          }
          else{
            done[i]=0;
          }
     		},
      	onerror: function(){
           buttonError(ddlButton,"Offline!");
         }
      });
   }
   else{
     buttonError(ddlButton,"Failed!");
   }
}
function ddl(ddlButton,ddlURL){
    ddlButton.firstChild.innerHTML="Loading...";
  	if(ddlURL.includes("apkfind")){
      try {
        var apkDlRequest1=GM.xmlHttpRequest({
              method: "GET",
              url: ddlURL,
              onload: function(response) {
                  if(response.finalUrl.includes("/captcha?")){
                      ddlButton.firstChild.setAttribute("href",response.finalUrl);
                      ddlButton.firstChild.innerHTML="CAPTCHA";
                      ddlButton.onclick=null;
                  }
                  else if(response.finalUrl.includes("app/removed")){
                      buttonError(ddlButton,"Removed!");
                  }
                  else{
                      try{
                        	var linkIntermediary = document.createElement("html");
                          linkIntermediary.innerHTML=response.response;
                          var link="http:"+linkIntermediary.getElementsByClassName("mdl-button")[0].getAttribute("href");
                          ddlButton.firstChild.innerHTML="Ready!";
                          openLink(link);
                        	ddlButton.onclick=function(){openLink(link);};

                      }
                      catch(err){
                          buttonError(ddlButton,"Failed!");
                          console.log(err);
                      }
                  }
              },
          		onerror: function(){
                buttonError(ddlButton,"Offline!");
              }
        });
      }
      catch (err) {
        buttonError(ddlButton,"Failed!");
        console.log(err);
      }
    }
    else if(ddlURL.includes("apkpure")){
        try{
            GM.xmlHttpRequest({
                method: "GET",
                url: ddlURL,
                onload: function(response) {
                  switch (response.status) {
                      case 410:
                          buttonError(ddlButton, "Removed!");
                          break;
                      case 404:
                          buttonError(ddlButton, "Not found!");
                          break;
                      default:
                        var apklink=response.responseText.substr(response.responseText.indexOf('https://download.apkpure.com/b/'),response.responseText.length-1);
                        apklink=apklink.substr(0,apklink.indexOf('"'));
                        console.log(ddlURL);
                        ddlButton.firstChild.innerHTML="Wait...";
                        //ddlButton.onclick=function(){GM.openInTab(apklink,"open_in_background");};
                        ddlFinalApk(apklink,ddlButton,0);
                  }
                },
                onerror: function(){
                  buttonError(ddlButton,"Offline!");
                }
            });
        }
        catch(err){
          buttonError(ddlButton,"Failed!");
          console.log(err);
        }
    }
  	else if(ddlURL.includes("apkcombo")){
        try{
            GM.xmlHttpRequest({
                method: "GET",
                url: ddlURL,
                onload: function(response) {
                  switch (response.status) {
                      case 410:
                          buttonError(ddlButton, "Removed!");
                          break;
                      case 404:
                          buttonError(ddlButton, "Not found!");
                          break;
                      default:
                          try {
                              var i;
                              var parser = new DOMParser();
                              var resp = parser.parseFromString(response.responseText, 'text/html');
                              var google = resp.getElementById("origin-server-tab");
                              var combo = resp.getElementById("apkcombo-server-tab");
                              var useGoogleServers=document.getElementById("useGoogleServers").checked;
                              setUseGS(useGoogleServers);
                              if ((google !== null)&&((combo === null)||(useGoogleServers==true))) {
                                  var googlelinks = google.getElementsByTagName("a");
                                  for (i = 0; i < googlelinks.length; i++) {
                                      ddlFinalApk(googlelinks[i].getAttribute("href"), ddlButton, i);
                                  }
                              } else if ((combo !== null)&&(useGoogleServers==false)) {
                                  var combolinks = combo.getElementsByTagName("a");
                                  for (i = 0; i < combolinks.length; i++) {
                                      ddlFinalApk(combolinks[i].getAttribute("href"), ddlButton, i);
                                  }
                              }
                              else{ //if loading the main download page results in an empty list of apks, tries to read the token to request directly the urls from apkcombo server
                                    var tokenStart=response.responseText.indexOf("/dl?token=")+4;
                                    var tokenEnd=response.responseText.indexOf("\"",tokenStart);
                                    var token = response.responseText.substring(tokenStart,tokenEnd);
                                    ddlURL=response.finalUrl;
                                    GM.xmlHttpRequest({
                                        method: "POST",
                                        url: ddlURL.replace("/download/apk", "/dl")+"?"+token,
                                        onload: function(response) {
                                            var parser2 = new DOMParser();
                                            var resp2 = parser2.parseFromString(response.responseText, 'text/html');
                                            google = resp2.getElementById("origin-server-tab");
                                            combo = resp2.getElementById("apkcombo-server-tab");
                                            if ((google !== null)&&((combo === null)||(useGoogleServers==true))) {//same as above
                                                var googlelinks = google.getElementsByTagName("a");
                                                for (i = 0; i < googlelinks.length; i++) {
                                                    ddlFinalApk(googlelinks[i].getAttribute("href"), ddlButton, i);
                                                }
                                            } else if ((combo !== null)&&(useGoogleServers==false)) {
                                                var combolinks = combo.getElementsByTagName("a");
                                                for (i = 0; i < combolinks.length; i++) {
                                                    ddlFinalApk(combolinks[i].getAttribute("href"), ddlButton, i);
                                                }
                                            } else {
                                                ddlButton.firstChild.setAttribute("href", ddlURL);
                                                ddlButton.firstChild.innerHTML = "New tab >";
                                                ddlButton.onclick = null;
                                            }
                                        },
                                        onerror: function(response) {
                                            buttonError(ddlButton, "Error!");
                                        }
                                    });
                                }
                          } catch (err) {
                              console.log(err);
                          }
                  }
              },
              	onerror: function(){
                  buttonError(ddlButton,"Offline!");
                }
            });
        }
        catch(err){
          buttonError(ddlButton,"Failed!");
          console.log(err);
        }
    }
}
function getUglyUIButtons()
{
  var matchingElements=[];
  var allElements = document.getElementsByTagName('button');
  for (var i = 0, n = allElements.length; i < n; i++)
  {
    if (allElements[i].getAttribute("data-item-id")!==null)
    {
      if (allElements[i].getAttribute("data-item-id").startsWith("%.@.")===true){
          matchingElements.push(allElements[i]);
      }
    }
  }
  //alert(matchingElements.length); shows how many buttons for installation and whishlist are in the page
  return matchingElements;
}
function checkUI(){
    //Different UIs:
    //1=Mobile HTML
    //2=Desktop HTML
    //3=Mobile UglyUI
    //4=Desktop UglyUI
    var check=0;
    try{
        if(document.getElementsByClassName("action-bar-menu-button").length>0){
            check=1;
        }
        else{
            if(document.getElementsByClassName("details-info").length>0){
                check=2;
            }
            else if(!document.getElementById("error-section")){
                check=4;
                var metaTags=document.head.getElementsByTagName("meta");
                for(var i=0;i<metaTags.length;i++){
                    if(metaTags[i].getAttribute("name")=="mobile-web-app-capable"){
                        check=3;
                    }
               }
            }
        }
    }
    catch(err){
        console.error('The user interface of Google Play Store was not recognized by "Direct Download from Google Play" script. This might result in unexpected behaviour of the page. Please report the error to the author on Greasyfork. Error: '+err);
    }
    return check;
}
function removePreviousCwiz(){
    appCwiz.parentNode.removeChild(appCwiz);
}
function buttonError(ddlButton,error){
  ddlButton.firstChild.innerHTML=error;
  ddlButton.firstChild.style.backgroundColor="#CCCCCC";
  ddlButton.onclick=null;
}
function setUseGS(check){
  useGS=check;
}