using OpenNest.Engine.Strategies;
using OpenNest.Geometry;

namespace OpenNest.Tests.Strategies;

public class FillPipelineTests
{
    private static Drawing MakeRectDrawing(double w, double h, string name = "rect")
    {
        var pgm = new OpenNest.CNC.Program();
        pgm.Codes.Add(new OpenNest.CNC.RapidMove(new Vector(0, 0)));
        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(w, 0)));
        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(w, h)));
        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(0, h)));
        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(0, 0)));
        return new Drawing(name, pgm);
    }

    [Fact]
    public void Pipeline_PopulatesPhaseResults()
    {
        var plate = new Plate(60, 120);
        var engine = new DefaultNestEngine(plate);
        var item = new NestItem { Drawing = MakeRectDrawing(20, 10) };

        engine.Fill(item, plate.WorkArea(), null, System.Threading.CancellationToken.None);

        Assert.True(engine.PhaseResults.Count >= FillStrategyRegistry.Strategies.Count,
            $"Expected phase results from all active strategies, got {engine.PhaseResults.Count}");
    }

    [Fact]
    public void Pipeline_SetsWinnerPhase()
    {
        var plate = new Plate(60, 120);
        var engine = new DefaultNestEngine(plate);
        var item = new NestItem { Drawing = MakeRectDrawing(20, 10) };

        var parts = engine.Fill(item, plate.WorkArea(), null, System.Threading.CancellationToken.None);

        Assert.True(parts.Count > 0);
        Assert.True(engine.WinnerPhase == NestPhase.Pairs ||
                    engine.WinnerPhase == NestPhase.Linear ||
                    engine.WinnerPhase == NestPhase.RectBestFit ||
                    engine.WinnerPhase == NestPhase.Extents ||
                    engine.WinnerPhase == NestPhase.Custom);
    }

    [Fact]
    public void Pipeline_RespectsCancellation()
    {
        var plate = new Plate(60, 120);
        var engine = new DefaultNestEngine(plate);
        var item = new NestItem { Drawing = MakeRectDrawing(20, 10) };
        var cts = new System.Threading.CancellationTokenSource();
        cts.Cancel();

        // Pre-cancelled token should return empty or partial results without throwing
        var parts = engine.Fill(item, plate.WorkArea(), null, cts.Token);

        // Should not throw — graceful degradation
        Assert.NotNull(parts);
    }
}