// Load the data from a Google Spreadsheet
// https://docs.google.com/a/highsoft.com/spreadsheet/pub?hl=en_GB&hl=en_GB&key=0AoIaUO7wH1HwdFJHaFI4eUJDYlVna3k5TlpuXzZubHc&output=html
Highcharts.data({
    googleSpreadsheetKey: '0AoIaUO7wH1HwdFJHaFI4eUJDYlVna3k5TlpuXzZubHc',

    // custom handler when the spreadsheet is parsed
    parsed: function (columns) {

        // Read the columns into the data array
        var data = [];
        columns[0].forEach((code, i) => {
            data.push({
                code: code.toUpperCase(),
                value: parseFloat(columns[2][i]),
                name: columns[1][i]
            });
        });

        // Initiate the chart
        Highcharts.mapChart('container', {

            chart: {
                styledMode: true
            },

            title: {
                text: 'Named data classes'
            },

            mapNavigation: {
                enabled: true
            },

            legend: {
                title: {
                    text: 'Population density'
                },
                align: 'left',
                verticalAlign: 'bottom',
                floating: true,
                layout: 'vertical',
                valueDecimals: 0,
                symbolRadius: 0,
                symbolHeight: 14
            },

            colorAxis: {
                dataClassColor: 'category',
                dataClasses: [{
                    to: 20,
                    name: 'Sparse (<20)'
                }, {
                    from: 20,
                    to: 200,
                    name: 'Moderate (2 - 200)'
                }, {
                    from: 200,
                    name: 'Dense (>200)'
                }]
            },

            series: [{
                data: data,
                mapData: Highcharts.maps['custom/world'],
                joinBy: ['iso-a2', 'code'],
                name: 'Population density',
                tooltip: {
                    valueSuffix: '/km²'
                }
            }]
        });
    }
});
