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 = TimelineRecipe.Create("compact", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(360, 360)), theme, mode,
    new VisualFrame("Project activities in March 2026", "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>Three date intervals with stable task identities and an explicitly configured time axis.</summary>
public static class TimelineRecipe {
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        var start = new DateTime(2026, 3, 2, 8, 0, 0, DateTimeKind.Utc);
        var discovery = new ChartSeries(new ChartSeriesId("discovery"), "Discovery", ChartSeriesKind.Timeline,
            new[] { new ChartPoint(start.ToOADate(), start.AddDays(3).ToOADate()) });
        var implementation = new ChartSeries(new ChartSeriesId("implementation"), "Implementation", ChartSeriesKind.Timeline,
            new[] { new ChartPoint(start.AddDays(2).ToOADate(), start.AddDays(7).ToOADate()) });
        var validation = new ChartSeries(new ChartSeriesId("validation"), "Validation", ChartSeriesKind.Timeline,
            new[] { new ChartPoint(start.AddDays(6).ToOADate(), start.AddDays(9).ToOADate()) });
        return Chart.Create().AddSeries(discovery).AddSeries(implementation).AddSeries(validation)
            .ConfigureXAxis(axis => {
                axis.Scale = ChartScaleKind.Time;
                axis.ValueFormat = ChartValueFormat.Custom(value => DateTime.FromOADate(value).ToString("MMM d", CultureInfo.InvariantCulture));
            }).WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
    }
}