// ==UserScript==
// @name         Direct download from Google Play
// @namespace    StephenP
// @version      2.1.0
// @description  Adds APKPure, APKMirror and Evozi download buttons to Google Play when browsing apps. This script is based on yurenchen's "google play apk downloader".
// @author       StephenP
// @match        https://play.google.com/*
// @match        http://play.google.com/*
// @grant        none
// @downloadURL none
// ==/UserScript==
var ui;
var wlButton;
var pageURL;
var title;
var appCwiz;
(function() {
    'use strict';
    ui=checkUI();
    pageURL=location.href;
    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, 3000);
})();
function waitForRemovingButtons(){
    if(title!=document.getElementById("main-title").innerHTML){
        title=document.getElementById("main-title").innerHTML;
        pageURL=location.href;
        wlButton=null;
        if(location.href.includes("details?id=")){
            if(ui>=3){
                removePreviousCwiz();
            }
            addButtons();
        }
    }
    else{
        setTimeout(waitForRemovingButtons, 1000);
    }
}
function checkReload(){
    if(pageURL!=location.href){
            waitForRemovingButtons();
    }
}
function addButtons(){
    var price=-1;
    var installButton=null;
    var instWishButtons=[];
    if(ui<=2){
        installButton=document.getElementsByClassName("buy")[0];
        price=installButton.firstElementChild.firstElementChild.getElementsByTagName("META")[1].content;
    }
    else{
        instWishButtons=getUglyUIButtons();
        installButton=instWishButtons[1];
        do{
            installButton=installButton.parentNode;
        }while(installButton.tagName!="C-WIZ");
        price=installButton.firstElementChild.firstElementChild.getElementsByTagName("META")[1].content;
        //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");
    }
        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/captcha?app='+id;
            var apkmirrorURL='https://www.apkmirror.com/?post_type=app_release&searchtype=apk&s='+id;
            wlButton = document.createDocumentFragment();
            var wishListButton;
            if(ui<=2){
                wishListButton=document.getElementsByClassName("id-wishlist-display")[0];
            }
            else{
                wishListButton=instWishButtons[0];
                do{
                    wishListButton=wishListButton.parentNode;
                }while(wishListButton.tagName!="C-WIZ");
            }
            wlButton.appendChild(wishListButton);
            if(ui==1){
                buttonslist = document.getElementsByClassName("details-actions")[0];
                html='<span id="apkpurebutton"><a href="'+apkpureURL+'" style="background-color: #24cd77" class="medium play-button download-apk-button apps ">APKPure</a></span><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>';
            }
            else if(ui==2){
                buttonslist = document.getElementsByClassName("details-actions-right")[0];
                html='<span id="apkpurebutton"><a href="'+apkpureURL+'" style="background-color: #24cd77" class="large play-button download-apk-button apps ">APKPure</a></span><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>';
            }
            else{
                buttonslist = installButton.parentNode;
                html='<span id="apkpurebutton"><a href="'+apkpureURL+'" style="background-color: #24cd77" class="ddlButton">APKPure</a></span><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>';
            }
            buttonslist.innerHTML=buttonslist.innerHTML+html;
            buttonslist.appendChild(wlButton);
            /*var apkpureButton=document.getElementById("apkpurebutton");
            apkpureButton.onclick=function(){pureDDL(this,apkpureURL);};*/
        }
}
//FUNCTION REMOVED BECAUSE APKPURE DOESN'T ALLOW ANYMORE CROSS-ORIGIN FRAMING
/*function pureDDL(apkpureButton,apkpureURL){
    apkpureButton.firstChild.innerHTML="Downloading...";
    try{
        document.body.removeChild(document.getElementById('apkpureFrame'));
    }
    catch(err){
    }
    finally{
        var hiddenFrame=document.createElement("iframe");
        hiddenFrame.style.width="0";
        hiddenFrame.style.height="0";
        hiddenFrame.setAttribute('id', 'apkpureFrame');
        hiddenFrame.setAttribute('src', apkpureURL);
        hiddenFrame.setAttribute('frameborder', "0");
        document.body.appendChild(hiddenFrame);
    }
}*/ 
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]);
      }
    }
  }
  return matchingElements;
}
function checkUI(){
    //Different UIs:
    //1=Mobile HTML
    //2=Desktop HTML
    //3=Mobile UglyUI
    //4=Desktop UglyUI
    var check;
    try{
        if(document.getElementsByClassName("action-bar-menu-button").length>0){
            check=1;
        }
        else{
            if(document.getElementsByClassName("details-info").length>0){
                check=2;
            }
            else{
                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){
        alert('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);
}