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 = PyramidRecipe.Create("compact-options", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(360, 360)), theme, mode,
    new VisualFrame("How work is allocated across services", "Reversed horizontal pyramid; areas encode values including zero", 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>Builds a triangular allocation chart from ordered service values.</summary>
public static class PyramidRecipe {
    /// <summary>Creates the selected pyramid example, including area encoding and geometric reversal.</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"))
            throw new ArgumentOutOfRangeException(nameof(variant));
        var chart = Chart.Create().WithDataLabels();
        if (variant is "options" or "compact-options") {
            var allocation = new ChartSeries(new ChartSeriesId("allocation"), "Allocation", ChartSeriesKind.Pyramid, new[] {
                new ChartPoint(1, 50), new ChartPoint(2, 30), new ChartPoint(3, 20), new ChartPoint(4, 0)
            }).WithPointColor(0, "#2F78C4").WithPointColor(1, "#E2A644").WithPointColor(2, "#34957A")
                .WithPointFillPattern(1, ChartFillPattern.DiagonalForward);
            chart.WithXLabels("Services", "Platform", "Support", "Unassigned").AddSeries(allocation)
                .ConfigurePyramid(options => {
                    options.ValueEncoding = ChartPyramidValueEncoding.Area;
                    options.Orientation = ChartOrientation.Horizontal;
                    options.Reversed = true;
                    options.AspectRatio = .75;
                });
        }
        else {
            var allocation = new ChartSeries(new ChartSeriesId("allocation"), "Allocation", ChartSeriesKind.Pyramid,
                new[] { new ChartPoint(1, 50), new ChartPoint(2, 30), new ChartPoint(3, 20) });
            chart.WithXLabels("Services", "Platform", "Support").AddSeries(allocation);
        }
        return chart.WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
    }
}