#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.Dark;
var theme = VisualTheme.Graphite();
var model = XZoomRecipe.Create("x-zoom", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Requests at 2\u00D7 X zoom", "Pan 17.3%; full-data Y scales; utilization on secondary Y", showLegend: true, 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


public static class XZoomRecipe {
    public static IVisualRenderable Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) =>
        new View(Build(variant.Contains("step", StringComparison.Ordinal) ? ChartSeriesKind.StepLine : ChartSeriesKind.Line,
            variant.StartsWith("compact", StringComparison.Ordinal)));

    private sealed class View : IVisualRenderable {
        private readonly Chart _chart;
        internal View(Chart chart) { _chart = chart; }
        public PreparedVisual Prepare(VisualRenderContext context) =>
            _chart.PrepareXZoom(context, new ChartXZoomLevels(1, 2, 4)).At(1, .173);
    }

    /// <summary>Creates the complete numeric source model used by the prepared X zoom examples.</summary>
    private static Chart Build(ChartSeriesKind kind, bool compact) {
        if (kind is not (ChartSeriesKind.Line or ChartSeriesKind.StepLine)) throw new ArgumentOutOfRangeException(nameof(kind));
        var steps = kind == ChartSeriesKind.StepLine;
        var x = new[] { 0d, .86, 1, 2, 3, 4, 5, 5.87, 8, 10 };
        ChartPoint[] Points(params double[] values) => values.Select((value, index) => new ChartPoint(x[index], value, x[index] == 4)).ToArray();
        var chart = Chart.Create().WithXAxis("Sample").WithYAxis("Requests").WithXAxisBounds(0, 10).WithDataLabels()
            .WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
        var observed = Points(88, 44, 34, 56, 46, 64, 42, 58, 50, 82);
        if (steps) chart.AddStepLine("Observed", observed);
        else chart.AddLine("Observed", observed);
        if (!compact) {
            var utilization = Points(96, 72, 48, 61, 55, 76, 49, 67, 84, 100);
            if (steps) chart.AddStepLine("Utilization", utilization);
            else chart.AddLine("Utilization", utilization);
            chart.Series[1].UseSecondaryValueAxis();
            chart.WithSecondaryYAxis("Utilization (%)");
            chart.Options.SecondaryYAxis.TickCount = 4;
        }
        chart.Options.XAxis.WithReversal(steps);
        chart.Options.XAxis.TickCount = 4; chart.Options.YAxis.TickCount = 4;
        foreach (var series in chart.Series) {
            series.ConfigureMarkers(markers => { markers.Enabled = true; markers.Radius = 3; });
            if (steps) series.WithInterpolation(ChartInterpolation.Step, ChartStepPosition.Middle);
        }
        return chart.AddVerticalLine(2, "Deployment").AddHorizontalLine(60, "Target")
            .AddPlotRegion(new(ChartColor.FromHex("#5487b8"), xMinimum: 2.5, xMaximum: 6.5,
                label: "Observation period", showLabel: true, opacity: .12))
            .AddPlotRegion(new(ChartColor.FromHex("#ac9148"), yMinimum: 65, yMaximum: 80,
                label: "High load", showLabel: true, opacity: .10));
    }
}