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.Dark;
var theme = VisualTheme.Graphite();
var model = RadialColumnRecipe.Create("wide", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Regional service workload", "Explore the data, then download the chart", 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>Regional requests and follow-ups encoded as numeric radial columns.</summary>
public static class RadialColumnRecipe {
    /// <summary>Creates radial columns with optional normalized stacking or explicit axis-caption density.</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 "axis-labels" or "compact-axis-labels" or "all-labels" or "compact-all-labels"))
            throw new ArgumentOutOfRangeException(nameof(variant));
        if (variant is "all-labels" or "compact-all-labels") return AllLabels();
        var requests = new ChartSeries(new ChartSeriesId("requests"), "Requests", ChartSeriesKind.RadialColumn, Points(1200, 950, 680, 1050));
        var followUps = new ChartSeries(new ChartSeriesId("follow-ups"), "Follow-ups", ChartSeriesKind.RadialColumn, Points(320, 410, 260, 360));
        var chart = Chart.Create().WithXLabels("North", "South", "East", "West")
            .WithRadialGeometry(new ChartRadialGeometryOptions(-90, 180, .22, .22, .15))
            .AddSeries(requests).AddSeries(followUps).WithDataLabels().WithDataLabelPlacement(ChartDataLabelPlacement.Inside)
            .WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
        if (variant is "options" or "compact-options") {
            requests.WithStackGroup("work").WithNormalization(100);
            followUps.WithStackGroup("work").WithNormalization(100).WithPointFillPattern(1, ChartFillPattern.DiagonalForward);
            chart.WithRadialGeometry(new ChartRadialGeometryOptions(-90, 180, .22, .22, .15, cornerRadius: 6))
                .WithYAxisBounds(0, 100).WithXAxis("Region").WithYAxis("Share of regional workload (%)")
                .ConfigureXAxis(axis => axis.LabelAngle = -30).ConfigureYAxis(axis => axis.LabelAngle = 30);
        } else {
            chart.WithYAxisBounds(0, 1500);
        }
        if (variant is "axis-labels" or "compact-axis-labels") {
            chart.WithXAxis("Region").WithYAxis("Requests")
                .ConfigureXAxis(axis => { axis.LabelOrientation = ChartAxisLabelOrientation.Parallel; axis.LabelAngle = 10; axis.LabelDensity = ChartLabelDensity.Relaxed; })
                .ConfigureYAxis(axis => { axis.LabelOrientation = ChartAxisLabelOrientation.Perpendicular; axis.LabelDensity = ChartLabelDensity.Dense; });
        }
        return chart;
    }

    private static Chart AllLabels() {
        var requests = new ChartSeries(new ChartSeriesId("requests"), "Requests", ChartSeriesKind.RadialColumn,
            Enumerable.Range(1, 20).Select(index => new ChartPoint(index, 500 + index * 20)));
        var chart = Chart.Create().WithXLabels(Enumerable.Range(1, 20).Select(index => "Region " + index + " request volume").ToArray())
            .WithRadialGeometry(new ChartRadialGeometryOptions(-75, 195, .2, .25, .1))
            .WithYAxisBounds(0, 1500).WithDataLabels(false).WithXAxis("All region captions; overlaps are intentional")
            .ConfigureXAxis(axis => axis.LabelDensity = ChartLabelDensity.All).AddSeries(requests)
            .WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
        chart.Options.YAxis.Visible = false;
        return chart;
    }

    private static ChartPoint[] Points(params double[] values) => values.Select((value, index) => new ChartPoint(index + 1, value)).ToArray();
}