/* Pi-hole: A black hole for Internet advertisements
*  (c) 2017 Pi-hole, LLC (https://pi-hole.net)
*  Network-wide ad blocking via your own hardware.
*
*  This file is copyright under the latest version of the EUPL.
*  Please see LICENSE file for your rights under this license. */
// Define global variables
/* global Chart */
var timeLineChart, queryTypeChart, forwardDestinationChart;
var queryTypePieChart, forwardDestinationPieChart, clientsChart;

function padNumber(num) {
    return ("00" + num).substr(-2,2);
}

// Helper function needed for converting the Objects to Arrays

function objectToArray(p){
    var keys = Object.keys(p);
    keys.sort(function(a, b) {
        return a - b;
    });

    var arr = [], idx = [];
    for (var i = 0; i < keys.length; i++) {
        arr.push(p[keys[i]]);
        idx.push(keys[i]);
    }
    return [idx,arr];
}

// Functions to update data in page

var failures = 0;
function updateQueriesOverTime() {
    $.getJSON("api.php?overTimeData10mins", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        // convert received objects to arrays
        data.domains_over_time = objectToArray(data.domains_over_time);
        data.ads_over_time = objectToArray(data.ads_over_time);
        // remove last data point since it not representative
        data.ads_over_time[0].splice(-1,1);
        // Remove possibly already existing data
        timeLineChart.data.labels = [];
        timeLineChart.data.datasets[0].data = [];
        timeLineChart.data.datasets[1].data = [];

            // Add data for each hour that is available
        for (var hour in data.ads_over_time[0]) {
            if ({}.hasOwnProperty.call(data.ads_over_time[0], hour)) {
                var d,h;
                h = parseInt(data.domains_over_time[0][hour]);
                if(parseInt(data.ads_over_time[0][0]) < 1200)
                {
                    // Fallback - old style
                    d = new Date().setHours(Math.floor(h / 6), 10 * (h % 6), 0, 0);
                }
                else
                {
                    // New style: Get Unix timestamps
                    d = new Date(1000*h);
                }

                timeLineChart.data.labels.push(d);
                timeLineChart.data.datasets[0].data.push(data.domains_over_time[1][hour]);
                timeLineChart.data.datasets[1].data.push(data.ads_over_time[1][hour]);
            }
        }
        $("#queries-over-time .overlay").hide();
        timeLineChart.update();
    }).done(function() {
        // Reload graph after 10 minutes
        failures = 0;
        setTimeout(updateQueriesOverTime, 600000);
    }).fail(function() {
        failures++;
        if(failures < 5)
        {
            // Try again after 1 minute only if this has not failed more
            // than five times in a row
            setTimeout(updateQueriesOverTime, 60000);
        }
    });
}

function updateQueryTypesOverTime() {
    $.getJSON("api.php?overTimeDataQueryTypes", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        // convert received objects to arrays
        data.over_time = objectToArray(data.over_time);
        // remove last data point since it not representative
        data.over_time[0].splice(-1,1);
        var timestamps = data.over_time[0];
        var plotdata  = data.over_time[1];
        // Remove possibly already existing data
        queryTypeChart.data.labels = [];
        queryTypeChart.data.datasets[0].data = [];
        queryTypeChart.data.datasets[1].data = [];

        var colors = [];
        $.each($.AdminLTE.options.colors, function(key, value) { colors.push(value); });
        queryTypeChart.data.datasets[0].backgroundColor = colors[0];
        queryTypeChart.data.datasets[1].backgroundColor = colors[1];

            // Add data for each hour that is available
        for (var j in timestamps) {
            if ({}.hasOwnProperty.call(timestamps, j)) {
                var d,h;
                h = parseInt(timestamps[j]);
                // New style: Get Unix timestamps
                d = new Date(1000*h);

                queryTypeChart.data.labels.push(d);
                queryTypeChart.data.datasets[0].data.push(1e-2*plotdata[j][0]);
                queryTypeChart.data.datasets[1].data.push(1e-2*plotdata[j][1]);
            }
        }
        $("#query-types .overlay").hide();
        queryTypeChart.update();
    }).done(function() {
        // Reload graph after 10 minutes
        failures = 0;
        setTimeout(updateQueryTypesOverTime, 600000);
    }).fail(function() {
        failures++;
        if(failures < 5)
        {
            // Try again after 1 minute only if this has not failed more
            // than five times in a row
            setTimeout(updateQueryTypesOverTime, 60000);
        }
    });
}
function updateQueryTypesPie() {
    $.getJSON("api.php?getQueryTypes", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        var colors = [];
        // Get colors from AdminLTE
        $.each($.AdminLTE.options.colors, function(key, value) { colors.push(value); });
        var v = [], c = [], k = [], iter;
        // Collect values and colors, and labels
        if(data.hasOwnProperty("querytypes"))
        {
            iter = data.querytypes;
        }
        else
        {
            iter = data;
        }
        $.each(iter, function(key , value) {
            v.push(value);
            c.push(colors.shift());
            k.push(key);
        });
        // Build a single dataset with the data to be pushed
        var dd = {data: v, backgroundColor: c};
        // and push it at once
        queryTypePieChart.data.datasets[0] = dd;
        queryTypePieChart.data.labels = k;
        $("#query-types-pie .overlay").hide();
        queryTypePieChart.update();
        queryTypePieChart.chart.config.options.cutoutPercentage=50;
        queryTypePieChart.update();
        // Don't use rotation animation for further updates
        queryTypePieChart.options.animation.duration=0;
    }).done(function() {
        // Reload graph after minute
        setTimeout(updateQueryTypesPie, 60000);
    });
}

function updateForwardedOverTime() {
    $.getJSON("api.php?overTimeDataForwards&getForwardDestinationNames", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        // convert received objects to arrays
        data.over_time = objectToArray(data.over_time);
        // remove last data point since it not representative
        data.over_time[0].splice(-1,1);
        var timestamps = data.over_time[0];
        var plotdata  = data.over_time[1];
        var labels = [];
        var key, i, j;
        for (key in data.forward_destinations)
        {
            if (!{}.hasOwnProperty.call(data.forward_destinations, key)) continue;
            if(key.indexOf("|") > -1)
            {
                var idx = key.indexOf("|");
                key = key.substr(0, idx);
            }
            labels.push(key);
        }
        // Get colors from AdminLTE
        var colors = [];
        $.each($.AdminLTE.options.colors, function(key, value) { colors.push(value); });
        var v = [], c = [], k = [];

        // Remove possibly already existing data
        forwardDestinationChart.data.labels = [];
        forwardDestinationChart.data.datasets[0].data = [];
        for (i = 1; i < forwardDestinationChart.data.datasets.length; i++)
        {
            forwardDestinationChart.data.datasets[i].data = [];
        }

        // Collect values and colors, and labels
        forwardDestinationChart.data.datasets[0].backgroundColor = colors[0];
        forwardDestinationChart.data.datasets[0].pointRadius = 0;
        forwardDestinationChart.data.datasets[0].pointHitRadius = 5;
        forwardDestinationChart.data.datasets[0].pointHoverRadius = 5;
        forwardDestinationChart.data.datasets[0].label = labels[0];
        forwardDestinationChart.data.datasets[0].cubicInterpolationMode = "monotone";

        for (i = forwardDestinationChart.data.datasets.length; i < plotdata[0].length; i++)
        {
            forwardDestinationChart.data.datasets.push({data: [], backgroundColor: colors[i], pointRadius: 0, pointHitRadius: 5, pointHoverRadius: 5, label: labels[i]});
        }

        // Add data for each dataset that is available
        for (j in timestamps)
        {
            if (!{}.hasOwnProperty.call(timestamps, j)) continue;
            for (key in plotdata[j])
            {
                if (!{}.hasOwnProperty.call(plotdata[j], key)) continue;
                forwardDestinationChart.data.datasets[key].data.push(1e-2*plotdata[j][key]);
            }

            var d = new Date(1000*parseInt(timestamps[j]));
            forwardDestinationChart.data.labels.push(d);
        }
        $("#forward-destinations .overlay").hide();
        forwardDestinationChart.update();
    }).done(function() {
        // Reload graph after 10 minutes
        failures = 0;
        setTimeout(updateForwardedOverTime, 600000);
    }).fail(function() {
        failures++;
        if(failures < 5)
        {
            // Try again after 1 minute only if this has not failed more
            // than five times in a row
            setTimeout(updateForwardedOverTime, 60000);
        }
    });
}


function updateClientsOverTime() {
    $.getJSON("api.php?overTimeDataClients&getClientNames", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        // convert received objects to arrays
        data.over_time = objectToArray(data.over_time);
        // remove last data point since it not representative
        data.over_time[0].splice(-1,1);
        var timestamps = data.over_time[0];
        var plotdata  = data.over_time[1];
        var labels = [];
        var key, i, j;
        for (key in data.clients)
        {
            if (!{}.hasOwnProperty.call(data.clients, key)) continue;
            if(key.indexOf("|") > -1)
            {
                var idx = key.indexOf("|");
                key = key.substr(0, idx);
            }
            labels.push(key);
        }
        // Get colors from AdminLTE
        var colors = [];
        $.each($.AdminLTE.options.colors, function(key, value) { colors.push(value); });
        var v = [], c = [], k = [];

        // Remove possibly already existing data
        clientsChart.data.labels = [];
        clientsChart.data.datasets[0].data = [];
        for (i = 1; i < clientsChart.data.datasets.length; i++)
        {
            clientsChart.data.datasets[i].data = [];
        }

        // Collect values and colors, and labels
        clientsChart.data.datasets[0].backgroundColor = colors[0];
        clientsChart.data.datasets[0].pointRadius = 0;
        clientsChart.data.datasets[0].pointHitRadius = 5;
        clientsChart.data.datasets[0].pointHoverRadius = 5;
        clientsChart.data.datasets[0].label = labels[0];

        for (i = clientsChart.data.datasets.length; i < plotdata[0].length; i++)
        {
            clientsChart.data.datasets.push({data: [], backgroundColor: colors[i], pointRadius: 0, pointHitRadius: 5, pointHoverRadius: 5, label: labels[i], cubicInterpolationMode: "monotone" });
        }

        // Add data for each dataset that is available
        for (j in timestamps)
        {
            if (!{}.hasOwnProperty.call(timestamps, j)) continue;
            for (key in plotdata[j])
            {
                if (!{}.hasOwnProperty.call(plotdata[j], key)) continue;
                clientsChart.data.datasets[key].data.push(plotdata[j][key]);
            }

            var d = new Date(1000*parseInt(timestamps[j]));
            clientsChart.data.labels.push(d);
        }
        $("#clients .overlay").hide();
        clientsChart.update();
    }).done(function() {
        // Reload graph after 10 minutes
        failures = 0;
        setTimeout(updateClientsOverTime, 600000);
    }).fail(function() {
        failures++;
        if(failures < 5)
        {
            // Try again after 1 minute only if this has not failed more
            // than five times in a row
            setTimeout(updateClientsOverTime, 60000);
        }
    });
}

function updateForwardDestinationsPie() {
    $.getJSON("api.php?getForwardDestinations=unsorted", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        var colors = [];
        // Get colors from AdminLTE
        $.each($.AdminLTE.options.colors, function(key, value) { colors.push(value); });
        var v = [], c = [], k = [], values = [];

        // Collect values and colors
        $.each(data.forward_destinations, function(key , value) {
            if(key.indexOf("|") > -1)
            {
                key = key.substr(0, key.indexOf("|"));
            }
            values.push([key, value, colors.shift()]);
        });

        // Sort data ASC accorwing to 2nd column, keep already assigned labels and colors
        values = values.sort(function(a,b) { return b[1] - a[1]; });

        // Split data into individual arrays for the graphs
        $.each(values, function(key , value) {
            k.push(value[0]);
            v.push(value[1]);
            c.push(value[2]);
        });

        // Build a single dataset with the data to be pushed
        var dd = {data: v, backgroundColor: c};
        // and push it at once
        forwardDestinationPieChart.data.labels = k;
        forwardDestinationPieChart.data.datasets[0] = dd;
        // and push it at once
        $("#forward-destinations-pie .overlay").hide();
        forwardDestinationPieChart.update();
        forwardDestinationPieChart.chart.config.options.cutoutPercentage=50;
        forwardDestinationPieChart.update();
        // Don't use rotation animation for further updates
        forwardDestinationPieChart.options.animation.duration=0;
    }).done(function() {
        // Reload graph after one minute
        setTimeout(updateForwardDestinationsPie, 60000);
    });
}

// Credit: http://stackoverflow.com/questions/1787322/htmlspecialchars-equivalent-in-javascript/4835406#4835406
function escapeHtml(text) {
  var map = {
    "&": "&amp;",
    "<": "&lt;",
    ">": "&gt;",
    "\"": "&quot;",
    "\'": "&#039;"
  };

  return text.replace(/[&<>"']/g, function(m) { return map[m]; });
}

function updateTopClientsChart() {
    $.getJSON("api.php?summaryRaw&getQuerySources", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        // Clear tables before filling them with data
        $("#client-frequency td").parent().remove();
        var clienttable =  $("#client-frequency").find("tbody:last");
        var client, percentage, clientname, clientip;
        for (client in data.top_sources) {

            if ({}.hasOwnProperty.call(data.top_sources, client)){
                // Sanitize client
                if(escapeHtml(client) !== client)
                {
                    // Make a copy with the escaped index if necessary
                    data.top_sources[escapeHtml(client)] = data.top_sources[client];
                }
                client = escapeHtml(client);
                if(client.indexOf("|") > -1)
                {
                    var idx = client.indexOf("|");
                    clientname = client.substr(0, idx);
                    clientip = client.substr(idx+1, client.length-idx);
                }
                else
                {
                    clientname = client;
                    clientip = client;
                }

                var url = "<a href=\"queries.php?client="+clientip+"\" title=\""+clientip+"\">"+clientname+"</a>";
                percentage = data.top_sources[client] / data.dns_queries_today * 100;
                clienttable.append("<tr> <td>" + url +
                    "</td> <td>" + data.top_sources[client] + "</td> <td> <div class=\"progress progress-sm\" title=\""+percentage.toFixed(1)+"% of " + data.dns_queries_today + "\"> <div class=\"progress-bar progress-bar-blue\" style=\"width: " +
                    percentage + "%\"></div> </div> </td> </tr> ");
            }

        }

        $("#client-frequency .overlay").hide();
        // Update top clients list data every ten seconds
        setTimeout(updateTopClientsChart, 10000);
    });
}

function updateTopLists() {
    $.getJSON("api.php?summaryRaw&topItems", function(data) {

        if("FTLnotrunning" in data)
        {
            return;
        }

        // Clear tables before filling them with data
        $("#domain-frequency td").parent().remove();
        $("#ad-frequency td").parent().remove();
        var domaintable = $("#domain-frequency").find("tbody:last");
        var adtable = $("#ad-frequency").find("tbody:last");
        var url, domain, percentage;
        for (domain in data.top_queries) {
            if ({}.hasOwnProperty.call(data.top_queries,domain)){
                // Sanitize domain
                if(escapeHtml(domain) !== domain)
                {
                    // Make a copy with the escaped index if necessary
                    data.top_queries[escapeHtml(domain)] = data.top_queries[domain];
                }
                domain = escapeHtml(domain);
                url = "<a href=\"queries.php?domain="+domain+"\">"+domain+"</a>";
                percentage = data.top_queries[domain] / data.dns_queries_today * 100;
                domaintable.append("<tr> <td>" + url +
                    "</td> <td>" + data.top_queries[domain] + "</td> <td> <div class=\"progress progress-sm\" title=\""+percentage.toFixed(1)+"% of " + data.dns_queries_today + "\"> <div class=\"progress-bar progress-bar-green\" style=\"width: " +
                    percentage + "%\"></div> </div> </td> </tr> ");
            }
        }

        // Remove table if there are no results (e.g. privacy mode enabled)
        if(jQuery.isEmptyObject(data.top_queries))
        {
            $("#domain-frequency").parent().remove();
        }

        for (domain in data.top_ads) {
            if ({}.hasOwnProperty.call(data.top_ads,domain)){
                // Sanitize domain
                if(escapeHtml(domain) !== domain)
                {
                    // Make a copy with the escaped index if necessary
                    data.top_ads[escapeHtml(domain)] = data.top_ads[domain];
                }
                domain = escapeHtml(domain);
                url = "<a href=\"queries.php?domain="+domain+"\">"+domain+"</a>";
                percentage = data.top_ads[domain] / data.ads_blocked_today * 100;
                adtable.append("<tr> <td>" + url +
                    "</td> <td>" + data.top_ads[domain] + "</td> <td> <div class=\"progress progress-sm\" title=\""+percentage.toFixed(1)+"% of " + data.ads_blocked_today + "\"> <div class=\"progress-bar progress-bar-yellow\" style=\"width: " +
                    percentage + "%\"></div> </div> </td> </tr> ");
            }
        }

        // Remove table if there are no results (e.g. privacy mode enabled)
        if(jQuery.isEmptyObject(data.top_ads))
        {
            $("#ad-frequency").parent().remove();
        }

        $("#domain-frequency .overlay").hide();
        $("#ad-frequency .overlay").hide();
        // Update top lists data every 10 seconds
        setTimeout(updateTopLists, 10000);
    });
}

var FTLoffline = false;
function updateSummaryData(runOnce) {
    var setTimer = function(timeInSeconds) {
        if (!runOnce) {
            setTimeout(updateSummaryData, timeInSeconds * 1000);
        }
    };
    $.getJSON("api.php?summary", function LoadSummaryData(data) {

        updateSessionTimer();

        if("FTLnotrunning" in data)
        {
            data["dns_queries_today"] = "Lost";
            data["ads_blocked_today"] = "connection";
            data["ads_percentage_today"] = "to";
            data["domains_being_blocked"] = "API";
            // Adjust text
            $("#temperature").html("<i class=\"fa fa-circle\" style=\"color:#FF0000\"></i> FTL offline");
            // Show spinner
            $("#queries-over-time .overlay").show();
            $("#forward-destinations .overlay").show();
            $("#query-types .overlay").show();
            $("#client-frequency .overlay").show();
            $("#domain-frequency .overlay").show();
            $("#ad-frequency .overlay").show();

            FTLoffline = true;
        }
        else
        {
            if(FTLoffline)
            {
                // FTL was previously offline
                FTLoffline = false;
                $("#temperature").text(" ");
                updateQueriesOverTime();
                updateForwardedOverTime();
                updateQueryTypesOverTime();
                updateTopClientsChart();
                updateTopLists();
            }
        }

        ["ads_blocked_today", "dns_queries_today", "ads_percentage_today", "unique_clients"].forEach(function(today) {
            var todayElement = $("span#" + today);
            todayElement.text() !== data[today] &&
            todayElement.text() !== data[today] + "%" &&
            $("span#" + today).addClass("glow");
        });

        window.setTimeout(function() {
            ["ads_blocked_today", "dns_queries_today", "domains_being_blocked", "ads_percentage_today", "unique_clients"].forEach(function(header, idx) {
                var textData = (idx === 3 && data[header] !== "to") ? data[header] + "%" : data[header];
                $("span#" + header).text(textData);
            });
            $("span.glow").removeClass("glow");
        }, 500);

    }).done(function() {
        if(!FTLoffline)
        {
          setTimer(1);
        }
        else
        {
          setTimer(10);
        }
    }).fail(function() {
        setTimer(300);
    });
}

$(document).ready(function() {

    var isMobile = {
        Windows: function() {
            return /IEMobile/i.test(navigator.userAgent);
        },
        Android: function() {
            return /Android/i.test(navigator.userAgent);
        },
        BlackBerry: function() {
            return /BlackBerry/i.test(navigator.userAgent);
        },
        iOS: function() {
            return /iPhone|iPad|iPod/i.test(navigator.userAgent);
        },
        any: function() {
            return (isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS() || isMobile.Windows());
        }
    };

    // Pull in data via AJAX

    updateSummaryData();

    var ctx = document.getElementById("queryOverTimeChart").getContext("2d");
    timeLineChart = new Chart(ctx, {
        type: "line",
        data: {
            labels: [],
            datasets: [
                {
                    label: "Total DNS Queries",
                    fill: true,
                    backgroundColor: "rgba(220,220,220,0.5)",
                    borderColor: "rgba(0, 166, 90,.8)",
                    pointBorderColor: "rgba(0, 166, 90,.8)",
                    pointRadius: 1,
                    pointHoverRadius: 5,
                    data: [],
                    pointHitRadius: 5,
                    cubicInterpolationMode: "monotone"
                },
                {
                    label: "Blocked DNS Queries",
                    fill: true,
                    backgroundColor: "rgba(0,192,239,0.5)",
                    borderColor: "rgba(0,192,239,1)",
                    pointBorderColor: "rgba(0,192,239,1)",
                    pointRadius: 1,
                    pointHoverRadius: 5,
                    data: [],
                    pointHitRadius: 5,
                    cubicInterpolationMode: "monotone"
                }
            ]
        },
        options: {
            tooltips: {
                enabled: true,
                mode: "x-axis",
                callbacks: {
                    title: function(tooltipItem, data) {
                        var label = tooltipItem[0].xLabel;
                        var time = label.match(/(\d?\d):?(\d?\d?)/);
                        var h = parseInt(time[1], 10);
                        var m = parseInt(time[2], 10) || 0;
                        var from = padNumber(h)+":"+padNumber(m-5)+":00";
                        var to = padNumber(h)+":"+padNumber(m+4)+":59";
                        return "Forward destinations from "+from+" to "+to;
                    },
                    label: function(tooltipItems, data) {
                        if(tooltipItems.datasetIndex === 1)
                        {
                            var percentage = 0.0;
                            var total = parseInt(data.datasets[0].data[tooltipItems.index]);
                            var blocked = parseInt(data.datasets[1].data[tooltipItems.index]);
                            if(total > 0)
                            {
                                percentage = 100.0*blocked/total;
                            }
                            return data.datasets[tooltipItems.datasetIndex].label + ": " + tooltipItems.yLabel + " (" + percentage.toFixed(1) + "%)";
                        }
                        else
                        {
                            return data.datasets[tooltipItems.datasetIndex].label + ": " + tooltipItems.yLabel;
                        }
                    }
                }
            },
            legend: {
                display: false
            },
            scales: {
                xAxes: [{
                    type: "time",
                    time: {
                        unit: "hour",
                        displayFormats: {
                            hour: "HH:mm"
                        },
                        tooltipFormat: "HH:mm"
                    }
                }],
                yAxes: [{
                    ticks: {
                        beginAtZero: true
                    }
                }]
            },
            maintainAspectRatio: false
        }
    });

    // Pull in data via AJAX

    updateQueriesOverTime();

    // Create / load "Forward Destinations over Time" only if authorized
    if(document.getElementById("forwardDestinationChart"))
    {
        ctx = document.getElementById("forwardDestinationChart").getContext("2d");
        forwardDestinationChart = new Chart(ctx, {
            type: "line",
            data: {
                labels: [],
                datasets: [{ data: [] }]
            },
            options: {
                tooltips: {
                    enabled: true,
                    mode: "x-axis",
                    callbacks: {
                        title: function(tooltipItem, data) {
                            var label = tooltipItem[0].xLabel;
                            var time = label.match(/(\d?\d):?(\d?\d?)/);
                            var h = parseInt(time[1], 10);
                            var m = parseInt(time[2], 10) || 0;
                            var from = padNumber(h)+":"+padNumber(m-5)+":00";
                            var to = padNumber(h)+":"+padNumber(m+4)+":59";
                            return "Forward destinations from "+from+" to "+to;
                        },
                        label: function(tooltipItems, data) {
                            return data.datasets[tooltipItems.datasetIndex].label + ": " + (100.0*tooltipItems.yLabel).toFixed(1) + "%";
                        }
                    }
                },
                legend: {
                    display: false
                },
                scales: {
                    xAxes: [{
                        type: "time",
                        time: {
                            unit: "hour",
                            displayFormats: {
                                hour: "HH:mm"
                            },
                            tooltipFormat: "HH:mm"
                        }
                    }],
                    yAxes: [{
                        ticks: {
                            mix: 0.0,
                            max: 1.0,
                            beginAtZero: true,
                            callback: function(value, index, values) {
                                return Math.round(value*100) + " %";
                            }
                        },
                        stacked: true
                    }]
                },
                maintainAspectRatio: true
            }
        });

        // Pull in data via AJAX
        updateForwardedOverTime();
    }

    // Create / load "Top Clients over Time" only if authorized
    if(document.getElementById("clientsChart"))
    {
        ctx = document.getElementById("clientsChart").getContext("2d");
        clientsChart = new Chart(ctx, {
            type: "line",
            data: {
                labels: [],
                datasets: [{ data: [] }]
            },
            options: {
                tooltips: {
                    enabled: true,
                    mode: "x-axis",
                    callbacks: {
                        title: function(tooltipItem, data) {
                            var label = tooltipItem[0].xLabel;
                            var time = label.match(/(\d?\d):?(\d?\d?)/);
                            var h = parseInt(time[1], 10);
                            var m = parseInt(time[2], 10) || 0;
                            var from = padNumber(h)+":"+padNumber(m-5)+":00";
                            var to = padNumber(h)+":"+padNumber(m+4)+":59";
                            return "Client activity from "+from+" to "+to;
                        },
                        label: function(tooltipItems, data) {
                            return data.datasets[tooltipItems.datasetIndex].label + ": " + tooltipItems.yLabel;
                        }
                    }
                },
                legend: {
                    display: false
                },
                scales: {
                    xAxes: [{
                        type: "time",
                        time: {
                            unit: "hour",
                            displayFormats: {
                                hour: "HH:mm"
                            },
                            tooltipFormat: "HH:mm"
                        }
                    }],
                    yAxes: [{
                        ticks: {
                            beginAtZero: true
                        },
                        stacked: true
                    }]
                },
                maintainAspectRatio: true
            }
        });

        // Pull in data via AJAX
        updateClientsOverTime();
    }

    // Create / load "Query Types over Time" only if authorized
    if(document.getElementById("queryTypeChart"))
    {
        ctx = document.getElementById("queryTypeChart").getContext("2d");
        queryTypeChart = new Chart(ctx, {
            type: "line",
            data: {
                labels: [],
                datasets: [
                    {
                        label: "A: IPv4 queries",
                        pointRadius: 0,
                        pointHitRadius: 5,
                        pointHoverRadius: 5,
                        data: [],
                        cubicInterpolationMode: "monotone"
                    },
                    {
                        label: "AAAA: IPv6 queries",
                        pointRadius: 0,
                        pointHitRadius: 5,
                        pointHoverRadius: 5,
                        data: [],
                        cubicInterpolationMode: "monotone"
                    }
                ]
            },
            options: {
                tooltips: {
                    enabled: true,
                    mode: "x-axis",
                    callbacks: {
                        title: function(tooltipItem, data) {
                            var label = tooltipItem[0].xLabel;
                            var time = label.match(/(\d?\d):?(\d?\d?)/);
                            var h = parseInt(time[1], 10);
                            var m = parseInt(time[2], 10) || 0;
                            var from = padNumber(h)+":"+padNumber(m-5)+":00";
                            var to = padNumber(h)+":"+padNumber(m+4)+":59";
                            return "Query types from "+from+" to "+to;
                        },
                        label: function(tooltipItems, data) {
                            return data.datasets[tooltipItems.datasetIndex].label + ": " + (100.0*tooltipItems.yLabel).toFixed(1) + "%";
                        }
                    }
                },
                legend: {
                    display: false
                },
                scales: {
                    xAxes: [{
                        type: "time",
                        time: {
                            unit: "hour",
                            displayFormats: {
                                hour: "HH:mm"
                            },
                            tooltipFormat: "HH:mm"
                        }
                    }],
                    yAxes: [{
                        ticks: {
                            mix: 0.0,
                            max: 1.0,
                            beginAtZero: true,
                            callback: function(value, index, values) {
                                return Math.round(value*100) + " %";
                            }
                        },
                        stacked: true
                    }]
                },
                maintainAspectRatio: true
            }
        });

        // Pull in data via AJAX
        updateQueryTypesOverTime();
    }

    // Create / load "Top Domains" and "Top Advertisers" only if authorized
    if(document.getElementById("domain-frequency")
        && document.getElementById("ad-frequency"))
    {
        updateTopLists();
    }

    // Create / load "Top Clients" only if authorized
    if(document.getElementById("client-frequency"))
    {
        updateTopClientsChart();
    }

    $("#queryOverTimeChart").click(function(evt){
        var activePoints = timeLineChart.getElementAtEvent(evt);
        if(activePoints.length > 0)
        {
            //get the internal index of slice in pie chart
            var clickedElementindex = activePoints[0]["_index"];

            //get specific label by index
            var label = timeLineChart.data.labels[clickedElementindex];

            //get value by index
            var from = label/1000 - 300;
            var until = label/1000 + 300;
            window.location.href = "queries.php?from="+from+"&until="+until;
        }
        return false;
    });

    if(document.getElementById("queryTypePieChart"))
    {
        ctx = document.getElementById("queryTypePieChart").getContext("2d");
        queryTypePieChart = new Chart(ctx, {
            type: "doughnut",
            data: {
                labels: [],
                datasets: [{ data: [] }]
            },
            options: {
                legend: {
                    display: true,
                    position: "right"
                },
                tooltips: {
                    enabled: true,
                    callbacks: {
                        title: function(tooltipItem, data) {
                            return "Query types";
                        },
                        label: function(tooltipItems, data) {
                            var dataset = data.datasets[tooltipItems.datasetIndex];
                            var label = data.labels[tooltipItems.index];
                            return label + ": " + dataset.data[tooltipItems.index].toFixed(1) + "%";
                        }
                    }
                },
                animation: {
                    duration: 750
                },
                cutoutPercentage: 0
            }
        });

        // Pull in data via AJAX
        updateQueryTypesPie();
    }

    if(document.getElementById("forwardDestinationPieChart"))
    {
        ctx = document.getElementById("forwardDestinationPieChart").getContext("2d");
        forwardDestinationPieChart = new Chart(ctx, {
            type: "doughnut",
            data: {
                labels: [],
                datasets: [{ data: [] }]
            },
            options: {
                legend: {
                    display: true,
                    position: "right"
                },
                tooltips: {
                    enabled: true,
                    callbacks: {
                        title: function(tooltipItem, data) {
                            return "Forward destinations";
                        },
                        label: function(tooltipItems, data) {
                            var dataset = data.datasets[tooltipItems.datasetIndex];
                            var label = data.labels[tooltipItems.index];
                            return label + ": " + dataset.data[tooltipItems.index].toFixed(1) + "%";
                        }
                    }
                },
                animation: {
                    duration: 750
                },
                cutoutPercentage: 0
            }
        });

        // Pull in data via AJAX
        updateForwardDestinationsPie();
    }
});