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 = LineRecipe.Create("options", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Weekly request volume", "Step transitions and three configured marker shapes", 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>Builds request-volume lines and a comparison of step positions and markers.</summary>
public static class LineRecipe {
    /// <summary>Creates the selected line example with its authored observations and styling.</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"))
            throw new ArgumentOutOfRangeException(nameof(variant));
        var chart = Chart.Create();
        if (variant is "options" or "compact-options") {
            chart.WithXLabels("Mon", "Tue", "Wed", "Thu", "Fri").WithYAxis("Recorded level");
            var positions = new[] { ChartStepPosition.Start, ChartStepPosition.Middle, ChartStepPosition.End };
            var shapes = new[] { ChartMarkerShape.Square, ChartMarkerShape.Diamond, ChartMarkerShape.Triangle };
            var ids = new[] { "step-start", "step-middle", "step-end" };
            for (var index = 0; index < positions.Length; index++) {
                var points = new[] { 8d, 17, 11, 23, 16 }.Select((value, point) => new ChartPoint(point + 1, value + index * 30));
                var series = ChartSeries.CreateLine(new ChartSeriesId(ids[index]), positions[index].ToString(), points)
                    .WithInterpolation(ChartInterpolation.Step, positions[index]);
                var shape = shapes[index];
                series.ConfigureMarkers(markers => { markers.Shape = shape; markers.Enabled = true; markers.Radius = 5; });
                chart.AddSeries(series);
            }
        }
        else {
            var points = Enumerable.Range(1, 6).Where(index => variant != "sparse" || index is 1 or 3 or 6)
                .Select(index => new ChartPoint(index, 20 + index * 7 % 29, variant == "sparse" && index == 6));
            chart.WithXLabels("Mon", "Tue", "Wed", "Thu", "Fri", "Sat")
                .AddSeries(ChartSeries.CreateLine(new ChartSeriesId("requests"), "Requests", points));
        }
        return chart.WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
    }
}