<!doctype html>
<html>

<head>
    <title>Radar Chart</title>
    <script src="../../dist/Chart.bundle.js"></script>
    <script src="../utils.js"></script>
    <style>
    canvas {
        -moz-user-select: none;
        -webkit-user-select: none;
        -ms-user-select: none;
    }
    </style>
</head>

<body>
    <div style="width:40%">
        <canvas id="canvas"></canvas>
    </div>
    <button id="randomizeData">Randomize Data</button>
    <button id="addDataset">Add Dataset</button>
    <button id="removeDataset">Remove Dataset</button>
    <button id="addData">Add Data</button>
    <button id="removeData">Remove Data</button>
    <script>
    var randomScalingFactor = function() {
        return Math.round(Math.random() * 100);
    };

    var color = Chart.helpers.color;
    var config = {
        type: 'radar',
        data: {
            labels: ["Eating", "Drinking", "Sleeping", "Designing", "Coding", "Cycling", "Running"],
            datasets: [{
                label: "My First dataset",
                backgroundColor: color(window.chartColors.red).alpha(0.2).rgbString(),
                borderColor: window.chartColors.red,
                pointBackgroundColor: window.chartColors.red,
                data: [
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor()
                ]
            }, {
                label: "My Second dataset",
                backgroundColor: color(window.chartColors.blue).alpha(0.2).rgbString(),
                borderColor: window.chartColors.blue,
                pointBackgroundColor: window.chartColors.blue,
                data: [
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor(), 
                    randomScalingFactor()
                ]
            },]
        },
        options: {
            legend: {
                position: 'top',
            },
            title: {
                display: true,
                text: 'Chart.js Radar Chart'
            },
            scale: {
              ticks: {
                beginAtZero: true
              }
            }
        }
    };

    window.onload = function() {
        window.myRadar = new Chart(document.getElementById("canvas"), config);
    };

    document.getElementById('randomizeData').addEventListener('click', function() {
        config.data.datasets.forEach(function(dataset) {
            dataset.data = dataset.data.map(function() {
                return randomScalingFactor();
            });
        });

        window.myRadar.update();
    });

    var colorNames = Object.keys(window.chartColors);
    document.getElementById('addDataset').addEventListener('click', function() {
        var colorName = colorNames[config.data.datasets.length % colorNames.length];;
        var newColor = window.chartColors[colorName];

        var newDataset = {
            label: 'Dataset ' + config.data.datasets.length,
            borderColor: newColor,
            backgroundColor: color(newColor).alpha(0.2).rgbString(),
            pointBorderColor: newColor,
            data: [],
        };

        for (var index = 0; index < config.data.labels.length; ++index) {
            newDataset.data.push(randomScalingFactor());
        }

        config.data.datasets.push(newDataset);
        window.myRadar.update();
    });

    document.getElementById('addData').addEventListener('click', function() {
        if (config.data.datasets.length > 0) {
            config.data.labels.push('dataset #' + config.data.labels.length);

            config.data.datasets.forEach(function (dataset) {
                dataset.data.push(randomScalingFactor());
            });

            window.myRadar.update();
        }
    });

    document.getElementById('removeDataset').addEventListener('click', function() {
        config.data.datasets.splice(0, 1);
        window.myRadar.update();
    });

    document.getElementById('removeData').addEventListener('click', function() {
        config.data.labels.pop(); // remove the label first

        config.data.datasets.forEach(function(dataset) {
            dataset.data.pop();
        });

        window.myRadar.update();
    });
    </script>
</body>

</html>
