import * as am5 from "@amcharts/amcharts5";
import * as am5percent from "@amcharts/amcharts5/percent";
import am5themes_Animated from "@amcharts/amcharts5/themes/Animated";


// Create root element
// https://www.amcharts.com/docs/v5/getting-started/#Root_element
const root = am5.Root.new("chartdiv");


// Set themes
// https://www.amcharts.com/docs/v5/concepts/themes/
root.setThemes([
  am5themes_Animated.new(root)
]);


// Create chart
// https://www.amcharts.com/docs/v5/charts/percent-charts/pie-chart/
const chart = root.container.children.push(am5percent.PieChart.new(root, {
  layout: root.verticalLayout // stacks the pie and the legend added below it
}));


// Create series
// https://www.amcharts.com/docs/v5/charts/percent-charts/pie-chart/#Series
const series = chart.series.push(am5percent.PieSeries.new(root, {
  calculateAggregates: true, // works out the highest value, which the radius adapter needs
  valueField: "value",
  categoryField: "category"
}));

// a 3 px outline in the background color keeps the slices apart
series.slices.template.setAll({
  strokeWidth: 3,
  stroke: root.interfaceColors.get("background")
});


// Scale each slice's radius by its value, relative to the biggest one
// https://www.amcharts.com/docs/v5/concepts/settings/adapters/
series.slices.template.adapters.add("radius", (radius, target) => {
  const dataItem = target.dataItem as am5.DataItem<am5percent.IPieSeriesDataItem> | undefined;
  const high = series.getPrivate("valueHigh"); // the biggest value in the data

  if (dataItem && radius != null && high) {
    return radius * dataItem.get("valueWorking", 0) / high; // the biggest slice keeps the full radius
  }
  return radius;
});


// Set data
// https://www.amcharts.com/docs/v5/charts/percent-charts/pie-chart/#Setting_data
series.data.setAll([
  { value: 10, category: "One" },
  { value: 9, category: "Two" },
  { value: 6, category: "Three" },
  { value: 5, category: "Four" },
  { value: 4, category: "Five" },
  { value: 3, category: "Six" }
]);


// Create legend
// https://www.amcharts.com/docs/v5/charts/percent-charts/legend-percent-series/
const legend = chart.children.push(am5.Legend.new(root, {
  centerX: am5.percent(50), // the legend's middle...
  x: am5.percent(50),       // ...at the middle of the chart: centered
  marginTop: 15,            // some room between the pie and the legend
  marginBottom: 15
}));

legend.data.setAll(series.dataItems); // one legend item per slice


// Play initial series animation
// https://www.amcharts.com/docs/v5/concepts/animations/#Animation_of_series
series.appear(1000, 100);