#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 = ConcentricPieRecipe.Create("concentric", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Service mix across two periods", "Independent totals share categories; disjoint bands preserve each series", 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>Two independent service mixes in explicit concentric Pie and Donut bands.</summary>
public static class ConcentricPieRecipe {
    /// <summary>Creates independent totals and source identities without implying equal totals across rings.</summary>
    public static Chart Create(string variant = "concentric", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("concentric" or "compact-concentric")) throw new ArgumentOutOfRangeException(nameof(variant));
        var prior = new ChartSeries(new ChartSeriesId("prior"), "Prior", ChartSeriesKind.Donut,
            new[] { new ChartPoint(1, 75), new ChartPoint(2, 25) })
            .WithRadialBand(new ChartRadialBand(.22, .52))
            .WithObservationIds(new[] { new ChartObservationId("subscriptions"), new ChartObservationId("consulting") });
        var current = new ChartSeries(new ChartSeriesId("current"), "Current", ChartSeriesKind.Pie,
            new[] { new ChartPoint(1, 132), new ChartPoint(2, 88) })
            .WithRadialBand(new ChartRadialBand(.66, 1))
            .WithObservationIds(new[] { new ChartObservationId("subscriptions"), new ChartObservationId("consulting") });
        prior.DataLabelPlacement = ChartDataLabelPlacement.Inside;
        current.DataLabelPlacement = ChartDataLabelPlacement.Inside;
        // The legend retains each period's values; keep these small concentric holes free of center text.
        return Chart.Create().WithXLabels("Subscriptions", "Consulting").WithDataLabels()
            .WithPieSliceLabelContent(ChartPieSliceLabelContent.Percent).WithDonutCenterLabel(false)
            .AddSeries(prior).AddSeries(current);
    }
}