// ==UserScript==
// @name        VKget music
// @version     1.1
// @description Скрипт добавляет ссылки для скачивания к аудиозаписям на vk.com. Для сохранения всех файлов через wget нажмите F2.
// This script adds download links to audios at vk.com. To save all files via wget, press F2.
// @match       *://vk.com/*
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js
// @grant       none
// @run-at      document-idle
// 25.08.2017
// @namespace https://greasyfork.org/users/148414
// @downloadURL none
// ==/UserScript==


(function() {
   function decode_url(url){
      var tmp = {};
      AudioPlayerHTML5.prototype._setAudioNodeUrl(tmp, url);
      return tmp.src;
   }

   function download(strData, strFileName, strMimeType) {
        var D = document,
            A = arguments,
            a = D.createElement("a"),
            d = A[0],
            n = A[1],
            t = A[2] || "text/plain";

        a.href = "data:" + strMimeType + "charset=utf-8," + strData;

        if (window.MSBlobBuilder) { // IE10
            var bb = new MSBlobBuilder();
            bb.append(strData);
            return navigator.msSaveBlob(bb, strFileName);
        }

        if ('download' in a) { //FF20, CH19
            a.setAttribute("download", n);
            a.innerHTML = "downloading...";
            D.body.appendChild(a);
            setTimeout(function() {
                var e = D.createEvent("MouseEvents");
                e.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
                a.dispatchEvent(e);
                D.body.removeChild(a);
            }, 66);
            return true;
        };
    }

    var ready = 0;
    var wget_list = "";
    var run = 0;

    function add_download_links() {
        run = 1;
        var audio_row_selector = '.audio_row';

        if ($(audio_row_selector).length <= ready) {
            run = 0;
            return;
        }

        var $this = $($(audio_row_selector)[ready]);

        var audio_id_raw = $this.data('audio');
        var audio_id = audio_id_raw[1] + '_' + audio_id_raw[0];

        var link = "";

        $.ajax({
            url: 'https://vk.com/al_audio.php',
            method: 'post',
            async: false,
            data: {
                act: 'reload_audio',
                al: 1,
                ids: audio_id
            },
            success: function(response) {
                s_response = response.split('"');
                //alert("s_response: " + s_response);
                if (s_response.length > 1) {
                    link = decode_url(s_response[1]);
                    //alert("link: " + link);
                    if (link != s_response[1]) {
                        var link_style = 'position: absolute; right: -12px; top: 12px; color: white; z-index: 100; background: red; border-radius: 3px 3px 3px 3px; padding: 2px 6px; font-size: 16px; opacity: 0.5;';
                        var song_name = $this.find('.audio_row__title_inner').text().trim().replace(/\"/g, '\'');
                        var performer_name = $this.find('.audio_row__performer').text().trim().replace(/\"/g, '\'');
                        var track_name = performer_name + ' - ' + song_name;

                        $this.append('<a class="audio-download-link" style="' + link_style +
                            '" title="Скачать" download="' +
                            track_name + '.mp3" data-track_name="' +
                            track_name + '" href="' + link +
                            '" onclick="arguments[0].stopPropagation()"> &#9835; </a>'
                        );
                        ready++;
                        wget_list += 'wget -c -O "' + track_name + '.mp3" ' + link + escape('\n');
                    }
                } else {
                    if (response.match(/!bool/)) {
                        //alert("skip bad link");
                        ready++;
                    }

                }
            }
        });

        setTimeout( function(){ add_download_links() }, 500);
    }

    add_download_links();
    if (!ready)
        setTimeout( function(){ add_download_links() }, 2000);

    window.addEventListener("scroll", function(){
        if (!run)
            add_download_links();
    }, false);

    $('body').keydown(function(e){
        if (e.which == 113) { // F2
            download(wget_list, 'wget.sh', 'text/plain');
        }
    });
})();