#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.Light;
var theme = VisualTheme.Graphite();
var model = PieSliceRadiusRecipe.Create("variable-radius", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(900, 480)), theme, mode,
    new VisualFrame("Service shares with authored radii", "Values determine angles; explicit fractions determine band thickness", 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>Authored Pie radii remain independent of each value's angular share.</summary>
public static class PieSliceRadiusRecipe {
    /// <summary>Creates service shares with explicit source identities and normalized band-relative radii.</summary>
    public static Chart Create(string variant = "variable-radius", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("variable-radius" or "compact-variable-radius")) throw new ArgumentOutOfRangeException(nameof(variant));
        var services = new ChartSeries(new ChartSeriesId("services"), "Services", ChartSeriesKind.Pie,
            new[] { new ChartPoint(1, 80), new ChartPoint(2, 60), new ChartPoint(3, 20) })
            .WithObservationIds(new[] { new ChartObservationId("subscriptions"), new ChartObservationId("consulting"), new ChartObservationId("support") })
            .WithPointSliceRadiusRatio(0, .35).WithPointSliceRadiusRatio(1, .7).WithPointSliceRadiusRatio(2, 1);
        services.DataLabelPlacement = ChartDataLabelPlacement.Outside;
        return Chart.Create().WithXLabels("Subscriptions", "Consulting", "Support").WithDataLabels()
            .WithPieSliceLabelContent(ChartPieSliceLabelContent.LabelAndPercent).WithDonutCenterLabel(false)
            .AddSeries(services);
    }
}