#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 = ConeFunnelRecipe.Create("wide", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 480)), theme, mode,
    new VisualFrame("From visitor to renewed subscription", "Each stage narrows the cone by the customers it keeps", 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>A cone funnel: trial sign-ups narrowing to renewed subscriptions, with retention captions.</summary>
public static class ConeFunnelRecipe {
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("wide" or "compact")) throw new ArgumentOutOfRangeException(nameof(variant));
        var stages = new (string Name, double Count)[] {
            ("Visitors", 12400), ("Sign-ups", 5270), ("Trials", 2130), ("Paid", 860), ("Renewed", 610)
        };
        var series = new ChartSeries(new ChartSeriesId("customers"), "Customers", ChartSeriesKind.Funnel,
            stages.Select((stage, index) => new ChartPoint(index + 1, stage.Count)));
        return Chart.Create().WithLegend(false).WithDataLabels().WithXLabels(stages.Select(stage => stage.Name).ToArray())
            .AddSeries(series).ConfigureFunnel(options => {
                options.Form = ChartFunnelForm.Cone;
                // Stage names and retention sit beside the cone, so narrow stages keep their full captions.
                options.LabelContent = ChartStageLabelContent.Separate;
            });
    }
}