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 = PolarRecipe.Create("compact", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(360, 360)), theme, mode,
    new VisualFrame("Directional sensor readings", "The same data in a compact view", 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>Directional readings with numeric angles, degree captions and optional reversed angles.</summary>
public static class PolarRecipe {
    /// <summary>Creates directional observations or compares irregularly spaced readings with expected values.</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();
        var observed = new ChartSeries(new ChartSeriesId("observed"), "Observed", ChartSeriesKind.Polar,
            Enumerable.Range(0, 6).Select(index => new ChartPoint(index * Math.PI / 3, 25 + index * 7)));
        var chart = Chart.Create().AddSeries(observed).ConfigureXAxis(axis => axis.LabelFormatter = Degrees)
            .WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
        if (variant == "options") {
            chart.Options.YAxis.WithBounds(0, 100);
            chart.Options.YAxis.TickCount = 6;
            chart.Options.YAxis.Labels.Add(new ChartAxisLabel(20, "20 · Target"));
        }
        return chart;
    }

    private static Chart Reversed() {
        var angles = new[] { 0d, .55, 1.35, 2.8, 3.65, 5.4 };
        var readings = new[] { 84d, 62, 96, 58, 78, 69 };
        var expected = new[] { 72d, 76, 82, 70, 74, 80 };
        var observed = new ChartSeries(new ChartSeriesId("observed"), "Observed", ChartSeriesKind.Polar,
            angles.Select((angle, index) => new ChartPoint(angle, readings[index])));
        var target = new ChartSeries(new ChartSeriesId("target"), "Expected", ChartSeriesKind.Polar,
            angles.Select((angle, index) => new ChartPoint(angle, expected[index])));
        return Chart.Create().WithYAxisBounds(0, 100).WithDataLabels(false)
            .ConfigureXAxis(axis => { axis.LabelFormatter = Degrees; axis.WithReversal(); })
            .AddSeries(observed).AddSeries(target)
            .WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
    }

    private static string Degrees(double angle) => (angle * 180 / Math.PI).ToString("0", System.Globalization.CultureInfo.InvariantCulture) + "°";
}