#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.Light;
var theme = VisualTheme.Graphite();
var model = AvailabilityHeatmapRecipe.Create("availability", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Daily availability per target", "14\u201327 October 2026; empty cells are days without measurements", showLegend: null, 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

/// <summary>Shows two weeks of daily availability for ten targets, with days that have no measurements left empty.</summary>
public static class AvailabilityHeatmapRecipe {
    /// <summary>Creates the availability heatmap; the compact variant keeps the same data.</summary>
    public static Chart Create(string variant = "availability", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("availability" or "compact-availability")) throw new ArgumentOutOfRangeException(nameof(variant));
        var colors = VisualTheme.Graphite().Resolve(mode);
        var start = new DateTime(2026, 10, 14);
        var chart = Chart.Create().ConfigureLabels(labels => labels.NoData = "No measurements")
            .WithXLabels(Enumerable.Range(0, 14).Select(day => start.AddDays(day).ToString("d MMM", CultureInfo.InvariantCulture)).ToArray())
            .WithHeatmapCellGap(2).WithValueUnit("%").WithValueFormat(ChartValueFormat.Number("0.#", CultureInfo.InvariantCulture));
        var targets = new[] { "dc1", "dc2", "dc3", "dc4", "dc5", "adfs", "dns", "exchange", "1.1.1.1", "8.8.8.8" };
        for (var row = 0; row < targets.Length; row++) {
            var days = new double?[14];
            for (var day = 0; day < days.Length; day++) {
                // Most days are complete; a few lose minutes or hours, and a new probe has no history yet.
                var loss = (row * 7 + day * 3) % 23 == 0 ? 6.5 : (row + day) % 11 == 0 ? 1.2 : (row * day) % 17 == 5 ? .4 : 0;
                days[day] = row == 7 && day < 3 ? null : Math.Round(100 - loss, 1);
            }
            chart.AddHeatmapRow(targets[row], days, id: new ChartSeriesId("availability-" + targets[row]));
        }
        // Named bands read faster than a gradient: a complete day, a short loss, and an outage.
        return chart.WithHeatmapColorScale(ChartColorScale.Discrete(new[] {
            new ChartColorBand(95, colors.Status.Critical.Fill, "Outage"),
            new ChartColorBand(100, colors.Status.Medium.Fill, "Short loss"),
            new ChartColorBand(null, colors.Status.Pass.Fill, "Complete")
        }).WithNoDataColor(colors.Border));
    }
}