#region Setup
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using ChartForgeX.Core;
using ChartForgeX.Primitives;
using ChartForgeX.Rendering;
using ChartForgeX.Themes;
using ChartForgeX.Topology;
using ChartForgeX.Typography;
using ChartForgeX.VisualArtifacts;
using ChartForgeX.VisualBlocks;

var mode = VisualThemeMode.Dark;
var theme = VisualTheme.Graphite();
var model = AutomaticRadialBandsRecipe.Create("automatic-rings", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(900, 600)), theme, mode,
    new VisualFrame("Three independent service mixes", "Source order allocates rings; every period keeps its own total", showLegend: null, showSurface: false));
var prepared = model.Prepare(context);
File.WriteAllText("visual.svg", prepared.ToSvg());
File.WriteAllBytes("visual.png", prepared.ToPng());
File.WriteAllText("visual.html", prepared.ToArtifact("example", VisualArtifactKind.Chart).ToHtmlPage());
#endregion

/// <summary>Three independent service mixes use source-ordered automatic Donut bands.</summary>
public static class AutomaticRadialBandsRecipe {
    /// <summary>Creates immutable allocation without assigning or changing authored RadialBand values.</summary>
    public static Chart Create(string variant = "automatic-rings", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("automatic-rings" or "compact-automatic-rings")) throw new ArgumentOutOfRangeException(nameof(variant));
        var chart = Chart.Create().WithXLabels("Subscriptions", "Consulting", "Support")
            .WithAutomaticRadialBands(new ChartRadialBandAllocation(.2, .04)).WithDonutCenterLabel(false)
            .WithPieSliceLabelContent(ChartPieSliceLabelContent.LabelAndPercent);
        var values = new[] { new[] { 50d, 30, 20 }, new[] { 90d, 45, 15 }, new[] { 110d, 66, 44 } };
        for (var index = 0; index < values.Length; index++) {
            var series = new ChartSeries(new ChartSeriesId("period-" + index), "Period " + (index + 1), ChartSeriesKind.Donut,
                values[index].Select((value, category) => new ChartPoint(category + 1, value)))
                .WithObservationIds(new[] { new ChartObservationId("subscriptions"), new ChartObservationId("consulting"), new ChartObservationId("support") })
                .WithDataLabels(index == values.Length - 1);
            if (index == values.Length - 1) {
                series.DataLabelPlacement = ChartDataLabelPlacement.Outside;
                series.WithPointSliceRadiusRatio(0, .35).WithPointSliceRadiusRatio(1, .7).WithPointSliceRadiusRatio(2, 1);
            }
            chart.AddSeries(series);
        }
        return chart;
    }
}