// Substring template helper for the responsive labels
Highcharts.Templating.helpers.substr = (s, from, length) =>
    s.substr(from, length);

// Create the chart
Highcharts.chart('container', {

    chart: {
        type: 'heatmap',
        marginTop: 40,
        marginBottom: 80,
        plotBorderWidth: 1
    },


    title: {
        text: 'Sales per employee per weekday',
        style: {
            fontSize: '1em'
        }
    },

    xAxis: {
        categories: [
            'Alexander', 'Marie', 'Maximilian', 'Sophia', 'Lukas',
            'Maria', 'Leon', 'Anna', 'Tim', 'Laura'
        ]
    },

    yAxis: {
        categories: ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'],
        title: null,
        reversed: true
    },

    accessibility: {
        point: {
            descriptionFormat: '{(add index 1)}. ' +
                '{series.xAxis.categories.(x)} sales ' +
                '{series.yAxis.categories.(y)}, {value}.'
        }
    },

    colorAxis: {
        min: 0,
        minColor: '#FFFFFF',
        maxColor: Highcharts.getOptions().colors[0]
    },

    legend: {
        align: 'right',
        layout: 'vertical',
        margin: 0,
        verticalAlign: 'top',
        y: 25,
        symbolHeight: 280
    },

    tooltip: {
        format: '<b>{series.xAxis.categories.(point.x)}</b> sold<br>' +
            '<b>{point.value}</b> items on <br>' +
            '<b>{series.yAxis.categories.(point.y)}</b>'
    },

    series: [{
        name: 'Sales per employee',
        borderWidth: 1,
        data: [
            [0, 0, 10], [0, 1, 19], [0, 2, 8], [0, 3, 24], [0, 4, 67],
            [1, 0, 92], [1, 1, 58], [1, 2, 78], [1, 3, 117], [1, 4, 48],
            [2, 0, 35], [2, 1, 15], [2, 2, 123], [2, 3, 64], [2, 4, 52],
            [3, 0, 72], [3, 1, 132], [3, 2, 114], [3, 3, 19], [3, 4, 16],
            [4, 0, 38], [4, 1, 5], [4, 2, 8], [4, 3, 117], [4, 4, 115],
            [5, 0, 88], [5, 1, 32], [5, 2, 12], [5, 3, 6], [5, 4, 120],
            [6, 0, 13], [6, 1, 44], [6, 2, 88], [6, 3, 98], [6, 4, 96],
            [7, 0, 31], [7, 1, 1], [7, 2, 82], [7, 3, 32], [7, 4, 30],
            [8, 0, 85], [8, 1, 97], [8, 2, 123], [8, 3, 64], [8, 4, 84],
            [9, 0, 47], [9, 1, 114], [9, 2, 31], [9, 3, 48], [9, 4, 91]
        ],
        dataLabels: {
            enabled: true,
            color: '#000000'
        }
    }],

    responsive: {
        rules: [{
            condition: {
                maxWidth: 500
            },
            chartOptions: {
                yAxis: {
                    labels: {
                        format: '{substr value 0 1}'
                    }
                }
            }
        }]
    }

});