(function ($) {
    var username;
    // How many entries to show per category before expanding
    var initialCount = 3;
    var tasteometer = "";
    var lastPlayedTrack = "";
    var sharedArtists = "";
    var topArtists = "";
    var topAlbums = "";
    var topTracks = "";
    var expanded = false;
    // Failed request flag.
    var flag = 0;
    $(document).ready(function () {
        // Avoid conflicting with other jQuery instances (userscripts et al).
        $.noConflict();
        // Fetch the username (appended from php) to base all get requests on.
        username = $('#lastfm_username').text();
        var div = $('#lastfm_stats');
        // Fetch the required data.
        // If data isn't cached, delays are issued in the class to avoid too many parallel requests to Last.fm
        getTasteometer(div);
        getLastPlayedTrack(div);
        getTopArtists(div);
        getTopAlbums(div);
        getTopTracks(div);
        // Allow expanding the show information to more than three entries.
        // Attach to document as lastfm_expand links are added dynamically when fetching the data.
        $(document).on('click', "#lastfm_expand", function () {
            // Make hidden entries visible and remove the expand button.
            if ( $(this).attr("href") == "#sharedartists" ){
                sharedArtists = sharedArtists.replace(/\ class="hidden"/g,"");
                sharedArtists = sharedArtists.replace(/<li>\[<a\ href=\"#sharedartists.*\]<\/li>/,"");
            } else if ( $(this).attr("href") == "#topartists" ){
                topArtists = topArtists.replace(/\ class="hidden"/g,"");
                topArtists = topArtists.replace(/<li>\[<a\ href=\"#topartists.*\]<\/li>/,"");
            } else if ( $(this).attr("href") == "#topalbums" ){
                topAlbums = topAlbums.replace(/\ class="hidden"/g,"");
                topAlbums = topAlbums.replace(/<li>\[<a\ href=\"#topalbums.*\]<\/li>/,"");
            } else if ( $(this).attr("href") == "#toptracks" ){
                topTracks = topTracks.replace(/\ class="hidden"/g,"");
                topTracks = topTracks.replace(/<li>\[<a\ href=\"#toptracks.*\]<\/li>/,"");
            }
            updateDivContents(div);
        });
        // Allow expanding or collapsing the Last.fm data.
        $("#lastfm_expand").on('click', function () {
            if(expanded == false){
                expanded = true;
                $(this).html("Show less info");
            } else {
                expanded = false;
                $(this).html("Show more info");
            }
            updateDivContents(div);
        });
        // Hide the reload button until data is expanded.
        $("#lastfm_reload_container").addClass("hidden");
        // Allow reloading the data manually.
        $.urlParam = function(name){
            var results = new RegExp('[\\?&amp;]' + name + '=([^&amp;#]*)').exec(window.location.href);
            return results[1] || 0;
        }
        $("#lastfm_reload").on('click', function () {
            // Clear the cache and the necessary variables.
            $.get('user.php?action=lastfm_clear_cache&username=' + username + '&uid=' + $.urlParam('id'), function (response) {
                });
            tasteometer = "";
            lastPlayedTrack = "";
            sharedArtists = "";
            topArtists = "";
            topAlbums = "";
            topTracks = "";
            // Revert the sidebar box to its initial state.
            $("#lastfm_stats").html("");
            //$(".box_lastfm").children("ul").append('<li id="lastfm_loading">Loading...</li>');
            $("#lastfm_stats").append('<li id="lastfm_loading">Loading...</li>');
            // Remove the stats reload button.
            $("#lastfm_reload_container").remove();
            getTasteometer(div);
            getLastPlayedTrack(div);
            getTopArtists(div);
            getTopAlbums(div);
            getTopTracks(div);
        });
    });
    
    // Allow updating the sidebar element contents as get requests are completed.
    function updateDivContents(div) {
        var html = "";
        // Pass all data vars, gets that haven't completed yet append empty strings.
        html += tasteometer;
        html += lastPlayedTrack;
        html += sharedArtists;
        html += topArtists;
        html += topAlbums;
        html += topTracks;
        html += '<li id="lastfm_loading">Loading...</li>';
        div.html(html);
        // If the data isn't expanded hide most of the info.
        if( expanded == false ){
            $("#lastfm_stats").children(":not(.lastfm_essential)").addClass("hidden");
            $("#lastfm_reload_container").addClass("hidden");
        } else {
            $("#lastfm_reload_container").removeClass("hidden");
        }
        // Once all requests are completed, remove the loading message.
        if(tasteometer && lastPlayedTrack && sharedArtists && topArtists && topAlbums && topTracks){
            $('#lastfm_loading').remove();
        }
    }
    
    // Escape ampersands with html code to avoid breaking the search links
    function escapeAmp(input){
        return input.replace(/&/g,"%26");
    }

    
    // Functions for fetching the required data are as follows.
    // Also gets the data for shared artists as they're bundled.
    function getTasteometer(div) {
        if ($("#lastfm_stats").attr("data-uid")){
            //Own profile, don't show tasteometer and shared artists.
            tasteometer = " ";
            sharedArtists = " ";
        } else {
            $.get('user.php?action=lastfm_compare&username=' + username, function (response) {
                // Two separate elements are received from one Last.fm API call.
                var tasteometerHtml = "";
                var sharedArtistsHtml = "";
                if ( response ){
                    json = JSON.parse(response);
                    if (json != null && json['error']) {
                        console.log("Tasteometer: " + json['message']);
                        // Specified non-existant username for Last.fm, remove Last.fm box from page.
                        if (json['error'] == "7" ){
                            tasteometer = " ";
                            sharedArtists = " ";
                        }
                    } else if (json == null) {
                        // No Last.fm compare possible.
                        tasteometer = " ";
                        sharedArtists = " ";
                    } else {
                        var j = json['comparison']['result'];
                        var a = j['artists']['artist'];
                        tasteometerHtml += '<li class="lastfm_essential">Compatibility: ';
                        var compatibility = Math.round(j['score'] * 100);
                        var background;
                        if  (compatibility < 50){
                            background = 'rgb(255, '+Math.floor(255*compatibility/50)+', 0)'
                        } else {
                            background = 'rgb('+Math.floor((1-(compatibility-50)/50)*255)+', 255, 0)'
                        }
                        tasteometerHtml += compatibility + '%\r\
                        <li class="lastfm_essential">\r\
                            <div id="lastfm_compatibilitybar_container">\n\
                                <div id="lastfm_compatibilitybar" style="width: '+compatibility+'%; background: '+background+';">\n\
                                </div>\r\
                            </div>\r\
                        </li>';
                        // Only print shared artists if there are any
                        if (j['artists']['matches'] != 0){
                            sharedArtistsHtml += '<li>Shared artists:</li><li><ul class="nobullet">';
                            var k = initialCount;
                            if (a.length < 3) k = a.length;
                            for (var i = 0; i < k; i++) {
                                sharedArtistsHtml += '<li><a href="artist.php?artistname=' + escapeAmp(a[i]['name']) + '">' + a[i]['name'] + '</a></li>'
                            }
                            if ( a.length > 3 ){
                                for (i = 3; i < a.length; i++) {
                                    sharedArtistsHtml += '<li class="hidden"><a href="artist.php?artistname=' + escapeAmp(a[i]['name']) + '">' + a[i]['name'] + '</a></li>'
                                }
                                sharedArtistsHtml += '<li>[<a href="#sharedartists" id="lastfm_expand" onclick="return false">Expand</a>]</li>'
                            }
                            sharedArtistsHtml += '</ul></li>';
                            sharedArtists = sharedArtistsHtml;
                        } else {
                            // Allow removing loading message regardless.
                            sharedArtists = " ";
                            sharedArtistsHtml += '<li class="lastfm_expand">[<a href="#sharedartists" id="lastfm_expand" onclick="return false">Expand</a>]</li>'
                        }
                        tasteometerHtml += "</li>";
                        tasteometer = tasteometerHtml;
                    }
                } else {
                    sharedArtists = " ";
                    tasteometer = " ";
                }
                updateDivContents(div);
            });
        }
    }
    
    function getLastPlayedTrack(div) {
        $.get('user.php?action=lastfm_last_played_track&username=' + username, function (response) {
            var html = "";
            if ( response ){
                var json = JSON.parse(response);
                if (json != null && json['error']) {
                    console.log("Last played track: " + json['message']);
                    lastPlayedTrack = " ";
                }
                else if (json == null) {
                    // No last played track available.
                    // Allow removing the loading message regardless.
                    lastPlayedTrack = " ";
                } else {
                    // Fix Last.fm API returning more than one entry despite limit on certain conditions.
                    if ( typeof(json[0]) === "object" ) json = json[0];
                    html += '<li class="lastfm_essential">Last played: ';
                    html += '<a href="artist.php?artistname=' + escapeAmp(json['artist']['#text']) + '">' + json['artist']['#text'] + '</a> - <a href="torrents.php?searchstr=' + escapeAmp(json['name']) + '">' + json['name'] + '</a>';
                    html += "</li>";
                    lastPlayedTrack = html;
                }
            } else {
                lastPlayedTrack = " ";
            }
            updateDivContents(div);
        });
    }
    
    function getTopArtists(div) {
        $.get('user.php?action=lastfm_top_artists&username=' + username, function (response) {
            var html;
            if ( response ){
                var json = JSON.parse(response);
                if (json != null && json['error']) {
                    console.log("Top artists: " + json['message']);
                    topArtists = " ";
                }
                else if (json == null) {
                    console.log("Error: json == null");
                    topArtists = " ";
                } else if ( json['topartists']['total']==0 ) {
                    // No top artists for the specified user, possibly a new Last.fm account.
                    // Allow removing the loading message regardless.
                    topArtists = " ";
                } else {
                    html = "<li>Top Artists:</li>";
                    html += "<li>";
                    var j = json['topartists']['artist'];
                    html += '<ul class="nobullet">';
                    var k = initialCount;
                    if (j.length < 3) k = j.length;
                    for (var i = 0; i < k; i++) {
                        html += '<li><a href="artist.php?artistname=' + escapeAmp(j[i]['name']) + '">' + j[i]['name'] + '</a></li>'
                    }
                    if ( j.length>3 ){
                        for (i = 3; i < j.length; i++) {
                            html += '<li class="hidden"><a href="artist.php?artistname=' + escapeAmp(j[i]['name']) + '">' + j[i]['name'] + '</a></li>'
                        }
                        html+= '<li>[<a href="#topartists" id="lastfm_expand" onclick="return false">Expand</a>]</li>'
                    }
                    html += '</ul>';
                    html += "</li>";
                    topArtists = html;
                }
            } else {
                topArtists = " ";
            }
            updateDivContents(div);
        });
    }

    function getTopAlbums(div) {
        $.get('user.php?action=lastfm_top_albums&username=' + username, function (response) {
            var html;
            if ( response ){
                var json = JSON.parse(response);
                if (json != null && json['error']) {
                    console.log("Top albums: " + json['message']);
                    topAlbums = " ";
                }
                else if (json == null) {
                    console.log("Error: json == null");
                    topAlbums = " ";
                } else if ( json['topalbums']['total']==0 ) {
                    // No top artists for the specified user, possibly a new Last.fm account.
                    // Allow removing the loading message regardless.
                    topAlbums = " ";
                } else {
                    var j = json['topalbums']['album'];
                    html = "<li>Top Albums:</li>";
                    html += "<li>";
                    html += '<ul class="nobullet">';
                    var k = initialCount;
                    if (j.length < 3) k = j.length;
                    for (var i = 0; i < k; i++) {
                        html += '<li><a href="artist.php?artistname=' + escapeAmp(j[i]['artist']['name']) + '">' + j[i]['artist']['name'] + '</a> - <a href="torrents.php?searchstr=' + escapeAmp(j[i]['name']) + '">' + j[i]['name'] + '</a></li>'
                    }
                    if ( j.length>3 ){
                        for (i = 3; i < j.length; i++) {
                            html += '<li class="hidden"><a href="artist.php?artistname=' + escapeAmp(j[i]['artist']['name']) + '">' + j[i]['artist']['name'] + '</a> - <a href="torrents.php?searchstr=' + escapeAmp(j[i]['name']) + '">' + j[i]['name'] + '</a></li>'
                        }
                        html+= '<li>[<a href="#topalbums" id="lastfm_expand" onclick="return false">Expand</a>]</li>'
                    }
                    html += '</ul>';
                    html += "</li>";
                    topAlbums = html;
                }
            } else {
                topAlbums = " ";
            }
            updateDivContents(div);
        });
    }
    
    function getTopTracks(div) {
        $.get('user.php?action=lastfm_top_tracks&username=' + username, function (response) {
            var html;
            if ( response ){
                var json = JSON.parse(response);
                if (json != null && json['error']) {
                    console.log("Toptracks: " + json['message']);
                    topTracks = " ";
                }
                else if (json == null) {
                    console.log("Error: json == null");
                    topTracks = " ";
                } else if ( json['toptracks']['total']==0 ) {
                    // No top artists for the specified user, possibly a new Last.fm account.
                    // Allow removing the loading message regardless.
                    topTracks = " ";
                } else {
                    html = "<li>Top Tracks:</li>";
                    html += "<li>";
                    var j = json['toptracks']['track'];
                    html += '<ul class="nobullet">';
                    var k = initialCount;
                    if (j.length < 3) k = j.length;
                    for (var i = 0; i < k; i++) {
                        html += '<li><a href="artist.php?artistname=' + escapeAmp(j[i]['artist']['name']) + '">' + j[i]['artist']['name'] + '</a> - <a href="torrents.php?searchstr=' + escapeAmp(j[i]['name']) + '">' + j[i]['name'] + '</a></li>'
                    }
                    if ( j.length>3 ){
                        for (i = 3; i < j.length; i++) {
                            html += '<li class="hidden"><a href="artist.php?artistname=' + escapeAmp(j[i]['artist']['name']) + '">' + j[i]['artist']['name'] + '</a> - <a href="torrents.php?searchstr=' + escapeAmp(j[i]['name']) + '">' + j[i]['name'] + '</a></li>'
                        }
                        html+= '<li>[<a href="#toptracks" id="lastfm_expand" onclick="return false">Expand</a>]</li>'
                    }
                    html += '</ul>';
                    html += "</li>";
                    topTracks = html;
                }
            } else {
                topTracks = " ";
            }
            updateDivContents(div);
        });
    }

})(jQuery);