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 = WaterfallRecipe.Create("compact-horizontal", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(360, 360)), theme, mode,
    new VisualFrame("Changes in available capacity", "Horizontal changes and checkpoints share a cumulative value axis", 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 running-balance waterfalls with signed changes and explicit checkpoints.</summary>
public static class WaterfallRecipe {
    /// <summary>Creates the selected waterfall example and its orientation.</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" or "horizontal" or "compact-horizontal"))
            throw new ArgumentOutOfRangeException(nameof(variant));
        var chart = Chart.Create();
        if (variant is "options" or "compact-options" or "horizontal" or "compact-horizontal") {
            var horizontal = variant is "horizontal" or "compact-horizontal";
            var movement = ChartSeries.CreateWaterfall(new ChartSeriesId("movement"), "Movement", new[] {
                ChartWaterfallItem.OpeningBalance(1, 120), ChartWaterfallItem.Delta(2, -30), ChartWaterfallItem.Subtotal(3),
                ChartWaterfallItem.Delta(4, -130), ChartWaterfallItem.Subtotal(5), ChartWaterfallItem.Delta(6, 70),
                ChartWaterfallItem.Total(7)
            }).WithObservationId(3, new ChartObservationId("cost-change"))
                .WithObservationId(4, new ChartObservationId("cost-checkpoint"))
                .WithPointColor(4, "#A5358A");
            chart.WithXLabels("Open", "Adjust", "Stage", "Costs", "Cost sum", "Recover", "Balance").AddSeries(movement)
                .ConfigureWaterfall(options => options.Orientation = horizontal ? ChartOrientation.Horizontal : ChartOrientation.Vertical);
            if (horizontal) chart.WithXAxis("Running balance").WithYAxis("Stage").WithBarStyle(ChartBarStyle.SegmentedCapsule);
            else chart.WithYAxis("Running balance");
            chart.Options.XAxis.WithReversal(!horizontal || variant == "compact-horizontal");
            chart.Options.YAxis.WithReversal();
            chart.WithDataLabels();
        }
        else {
            var changes = new ChartSeries(new ChartSeriesId("changes"), "Changes", ChartSeriesKind.Waterfall, new[] {
                new ChartPoint(1, 60), new ChartPoint(2, -15), new ChartPoint(3, 25), new ChartPoint(4, -10), new ChartPoint(5, 12)
            });
            chart.WithXLabels("North", "South", "East", "West", "Central", "Total").AddSeries(changes);
        }
        return chart.WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
    }
}