#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 = SankeyPaintRecipe.Create("gradient-colors", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Requests across processing stages", "", 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>Endpoint gradients and outlined labels use the same native Sankey scene in SVG and PNG.</summary>
public static class SankeyPaintRecipe {
    public static Chart Create(string variant = "gradient-colors", VisualThemeMode mode = VisualThemeMode.Light) {
        var chart = Chart.Create().AddSankey("Requests", new[] {
            new ChartNode("received", "Received"), new ChartNode("review", "Review"), new ChartNode("ready", "Ready")
        }, new[] {
            new ChartFlowLink("standard", "received", "review", 60),
            new ChartFlowLink("priority", "received", "review", 20),
            new ChartFlowLink("delivered", "review", "ready", 80)
        }).ConfigureSankey(options => {
            options.FlowColorMode = ChartSankeyFlowColorMode.Gradient;
            options.LabelStyle = ChartSankeyLabelStyle.Outlined;
            options.RibbonOpacity = .6; options.NodeWidth = 16;
        }).WithValueFormat(ChartValueFormat.Number("0", CultureInfo.InvariantCulture));
        chart.Series[0].WithPointColor(0, ChartColor.FromHex("#2864B4"))
            .WithPointColor(1, ChartColor.FromHex("#BB6428")).WithPointColor(2, ChartColor.FromHex("#279473"))
            .WithFlowStyle("priority", new ChartFlowStyle(fill: ChartColor.FromHex("#7954AA"), fillOpacity: .75));
        return chart;
    }
}