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 = GanttRecipe.Create("wide", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Project delivery in March 2026", "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>Tasks, progress and a milestone connected through chart-owned dependency handles.</summary>
public static class GanttRecipe {
    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 = ChartSeries.CreateGanttTask(new ChartSeriesId("discovery"), "Discovery", start, start.AddDays(3), .9);
        var implementation = ChartSeries.CreateGanttTask(new ChartSeriesId("implementation"), "Implementation", start.AddDays(3), start.AddDays(7), .55);
        var validation = ChartSeries.CreateGanttTask(new ChartSeriesId("validation"), "Validation", start.AddDays(7), start.AddDays(9), .1);
        var delivery = ChartSeries.CreateGanttMilestone(new ChartSeriesId("delivery"), "Delivery", start.AddDays(9));
        return Chart.Create().AddSeries(discovery).AddSeries(implementation).AddSeries(validation).AddSeries(delivery)
            .AddGanttDependency(discovery, implementation).AddGanttDependency(implementation, validation).AddGanttDependency(validation, delivery)
            .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));
    }
}