var chartColors = {
	red: 'rgb(255, 99, 132)',
	orange: 'rgb(255, 159, 64)',
	yellow: 'rgb(255, 205, 86)',
	green: 'rgb(75, 192, 192)',
	blue: 'rgb(54, 162, 235)',
	purple: 'rgb(153, 102, 255)',
	grey: 'rgb(201, 203, 207)'
};
var effectColors = {
	highlight: 'rgba(255, 255, 255, 0.75)',
	shadow: 'rgba(0, 0, 0, 0.5)',
	innerglow: 'rgba(255, 255, 0, 0.5)',
	outerglow: 'rgb(255, 255, 0)'
};

function randomScalingFactor() {
	return Math.round(Math.random() * 100);
}

var color = Chart.helpers.color;
var ACTIONS = [['Eating', 'Dinner'], ['Drinking', 'Water'], 'Sleeping', ['Designing', 'Graphics'], 'Coding', 'Cycling', 'Running'];
var config = {
	type: 'radar',
	data: {
		labels: [['Eating', 'Dinner'], ['Drinking', 'Water'], 'Sleeping', ['Designing', 'Graphics'], 'Coding', 'Cycling', 'Running'],
		datasets: [{
			label: 'Dataset 1',
			backgroundColor: color(chartColors.red).alpha(0.2).rgbString(),
			borderColor: chartColors.red,
			pointBorderColor: chartColors.red,
			pointBackgroundColor: chartColors.red,
			data: [0, 0, 0, 0, 0, 0, 0].map(function() {
				return randomScalingFactor();
			}),
			shadowOffsetX: 3,
			shadowOffsetY: 3,
			shadowBlur: 10,
			shadowColor: effectColors.shadow,
			pointRadius: 4,
			pointBevelWidth: 2,
			pointBevelHighlightColor: effectColors.highlight,
			pointBevelShadowColor: effectColors.shadow,
			pointHoverRadius: 6,
			pointHoverBevelWidth: 3,
			pointHoverInnerGlowWidth: 20,
			pointHoverInnerGlowColor: effectColors.innerglow,
			pointHoverOuterGlowWidth: 20,
			pointHoverOuterGlowColor: effectColors.outerglow
		}, {
			label: 'Dataset 2',
			backgroundColor: color(chartColors.blue).alpha(0.2).rgbString(),
			borderColor: chartColors.blue,
			pointBackgroundColor: chartColors.blue,
			pointBorderColor: chartColors.blue,
			data: [0, 0, 0, 0, 0, 0, 0].map(function() {
				return randomScalingFactor();
			}),
			shadowOffsetX: 3,
			shadowOffsetY: 3,
			shadowBlur: 10,
			shadowColor: effectColors.shadow,
			pointRadius: 4,
			pointBevelWidth: 2,
			pointBevelHighlightColor: effectColors.highlight,
			pointBevelShadowColor: effectColors.shadow,
			pointHoverRadius: 6,
			pointHoverBevelWidth: 3,
			pointHoverInnerGlowWidth: 20,
			pointHoverInnerGlowColor: effectColors.innerglow,
			pointHoverOuterGlowWidth: 20,
			pointHoverOuterGlowColor: effectColors.outerglow
		}]
	},
	options: {
		title: {
			display: true,
			text: 'Mixed (radar chart) sample'
		},
		scale: {
			ticks: {
				beginAtZero: true,
				showLabelBackdrop: false
			}
		},
		tooltips: {
			shadowOffsetX: 3,
			shadowOffsetY: 3,
			shadowBlur: 10,
			shadowColor: effectColors.shadow,
			bevelWidth: 2,
			bevelHighlightColor: effectColors.highlight,
			bevelShadowColor: effectColors.shadow
		}
	}
};

window.onload = function() {
	var ctx = document.getElementById('myChart').getContext('2d');
	window.myChart = new Chart(ctx, config);
};

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

var colorNames = Object.keys(chartColors);
document.getElementById('addDataset').addEventListener('click', function() {
	var colorName = colorNames[config.data.datasets.length % colorNames.length];
	var newColor = chartColors[colorName];
	var newDataset = {
		label: 'Dataset ' + (config.data.datasets.length + 1),
		backgroundColor: color(newColor).alpha(0.2).rgbString(),
		borderWidth: 3,
		borderColor: newColor,
		pointBackgroundColor: newColor,
		pointBorderColor: newColor,
		data: [],
		shadowOffsetX: 3,
		shadowOffsetY: 3,
		shadowBlur: 10,
		shadowColor: effectColors.shadow,
		pointRadius: 4,
		pointBevelWidth: 2,
		pointBevelHighlightColor: effectColors.highlight,
		pointBevelShadowColor: effectColors.shadow,
		pointHoverRadius: 6,
		pointHoverBevelWidth: 3,
		pointHoverInnerGlowWidth: 20,
		pointHoverInnerGlowColor: effectColors.innerglow,
		pointHoverOuterGlowWidth: 20,
		pointHoverOuterGlowColor: effectColors.outerglow
	};

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

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

document.getElementById('removeDataset').addEventListener('click', function() {
	config.data.datasets.pop();
	window.myChart.update();
});

document.getElementById('addData').addEventListener('click', function() {
	if (config.data.datasets.length > 0) {
		var month = ACTIONS[config.data.labels.length % ACTIONS.length];
		config.data.labels.push(month);

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

		window.myChart.update();
	}
});

document.getElementById('removeData').addEventListener('click', function() {
	config.data.labels.splice(-1, 1); // remove the label first

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

	window.myChart.update();
});