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 = HistogramRecipe.Create("wide", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Measurements across intervals", "Observation counts in unequal measurement intervals", showLegend: false, 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>Counts, density, signed sums or means over the same explicit unequal measurement intervals.</summary>
public static class HistogramRecipe {
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        var aggregation = variant.StartsWith("compact-", StringComparison.Ordinal) ? variant.Substring(8) : variant;
        if (aggregation == "compact") aggregation = "wide";
        var layout = ChartHistogramBinLayout.FromBoundaries(new[] { 0d, 1, 3, 6, 10 });
        var chart = Chart.Create().WithXAxis("Measurement").WithDataLabels();
        chart.Options.XAxis.WithBounds(0, 10);
        ChartSeries observations;
        if (aggregation is "wide" or "density") {
            observations = ChartSeries.CreateHistogram(new ChartSeriesId("observations"), "Observations",
                new[] { .2, .4, .8, 1.2, 1.8, 2.5, 6.1, 7.5, 9 }, layout,
                aggregation == "density" ? ChartHistogramEncoding.Density : ChartHistogramEncoding.Value);
            chart.WithYAxis(aggregation == "density" ? "Observations per unit" : "Observation count");
            foreach (var bin in observations.HistogramBins) observations.WithPointLabel(bin.Index, bin.Count + " obs");
        } else if (aggregation is "sum" or "mean") {
            observations = ChartSeries.CreateHistogram(new ChartSeriesId("quantity"), "Quantity",
                new[] { new ChartPoint(.2, 10), new ChartPoint(.4, -4), new ChartPoint(1.2, 8),
                    new ChartPoint(2.5, 12), new ChartPoint(6.1, -4), new ChartPoint(9, -8) }, layout,
                aggregation == "sum" ? ChartHistogramAggregation.Sum : ChartHistogramAggregation.Mean);
            chart.WithYAxis(aggregation == "sum" ? "Total quantity" : "Mean quantity");
        } else throw new ArgumentOutOfRangeException(nameof(variant));
        return chart.AddSeries(observations);
    }
}