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;

// Optional exact gallery typography; copy the gallery's fonts directory beside this program.
FontRegistry.Register("CFX Proof Carlito", "fonts/Carlito-Regular.ttf", 400);
FontRegistry.Register("CFX Proof Carlito", "fonts/Carlito-Bold.ttf", 700);
var mode = VisualThemeMode.Light;
var theme = VisualTheme.Graphite();
var model = RadarRecipe.Create("angular-reversal", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Observed and expected service levels", "Reversed category angles retain source labels, values and paint", showLegend: null, showSurface: false), FontSpec.FromFamily("CFX Proof Carlito"));
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());

/// <summary>Observed service levels compared with expected values or a marked target line.</summary>
public static class RadarRecipe {
    /// <summary>Creates shared radar categories with marker options or reversed angular order.</summary>
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("wide" or "compact" or "sparse" or "options" or "compact-options" or "angular-reversal" or "compact-angular-reversal"))
            throw new ArgumentOutOfRangeException(nameof(variant));
        if (variant is "angular-reversal" or "compact-angular-reversal") return Reversed();
        if (variant is "options" or "compact-options") return Markers();
        var observed = new ChartSeries(new ChartSeriesId("observed"), "Observed", ChartSeriesKind.Radar, Observations(variant));
        var expected = new ChartSeries(new ChartSeriesId("expected"), "Expected", ChartSeriesKind.Radar, Observations(variant, 12));
        return Chart.Create().WithXLabels("Speed", "Coverage", "Capacity", "Quality", "Recovery", "Support")
            .AddSeries(observed).AddSeries(expected)
            .WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
    }

    private static Chart Markers() {
        var observed = new ChartSeries(new ChartSeriesId("observed"), "Observed", ChartSeriesKind.Radar, Points(58, 76, 69, 84, 62, 73))
            .ConfigureRadar(options => options.FillOpacity = .2)
            .ConfigureMarkers(markers => { markers.Shape = ChartMarkerShape.Diamond; markers.Enabled = true; });
        var target = new ChartSeries(new ChartSeriesId("target"), "Target", ChartSeriesKind.Radar, Points(75, 85, 80, 90, 75, 85))
            .ConfigureRadar(options => options.Form = ChartLineAreaForm.Line)
            .ConfigureMarkers(markers => { markers.Shape = ChartMarkerShape.Square; markers.Enabled = true; });
        return Chart.Create().WithXLabels("Speed", "Coverage", "Capacity", "Quality", "Recovery", "Support")
            .WithYAxisBounds(0, 100).AddSeries(observed).AddSeries(target)
            .WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
    }

    private static Chart Reversed() {
        var observed = new ChartSeries(new ChartSeriesId("observed"), "Observed", ChartSeriesKind.Radar, Points(58, 76, 69, 84))
            .ConfigureRadar(options => options.FillOpacity = .2)
            .ConfigureMarkers(markers => { markers.Shape = ChartMarkerShape.Diamond; markers.Radius = 5; });
        var target = new ChartSeries(new ChartSeriesId("target"), "Target", ChartSeriesKind.Radar, Points(75, 85, 80, 90))
            .ConfigureRadar(options => options.Form = ChartLineAreaForm.Line)
            .ConfigureMarkers(markers => { markers.Shape = ChartMarkerShape.Square; markers.Radius = 4; });
        return Chart.Create().WithXLabels("North", "East", "South", "West").WithYAxisBounds(0, 100).WithDataLabels(false)
            .AddSeries(observed).AddSeries(target).ConfigureXAxis(axis => axis.WithReversal())
            .WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
    }

    private static ChartPoint[] Points(params double[] values) => values.Select((value, index) => new ChartPoint(index + 1, value)).ToArray();
    private static ChartPoint[] Observations(string variant, double offset = 0) => (variant == "sparse" ? new[] { 1, 3, 6 } : Enumerable.Range(1, 6))
        .Select(index => new ChartPoint(index, 20 + offset + index * 7 % 29)).ToArray();
}