using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using LindtLeerformPlugin.Services;

namespace LindtLeerformPlugin.ViewModels;

public partial class CellHistogramViewModel : ObservableObject
{
    [ObservableProperty] private string _title = "Cell Histogram";
    public int CellIndex { get; set; }
    public int[] Bins { get; init; } = [5, 5, 5];

    [ObservableProperty] private float[]? _cellHistogram;
    [ObservableProperty] private float[]? _cellSpline;
    [ObservableProperty] private float[] _averageSpline = new float[SplineCurve.KnotCount];
    [ObservableProperty] private string _verdictText = string.Empty;

    public bool HasOverride => CellSpline is { Length: SplineCurve.KnotCount };

    /// <summary>
    /// Invoked by the view when the user releases the mouse after dragging a spline handle.
    /// Lets the calibration window re-test and refresh its preview while the dialog stays open.
    /// </summary>
    public Action<float[], float[]?>? DragCompleted { get; set; }

    public void RaiseDragCompleted() => DragCompleted?.Invoke(AverageSpline, CellSpline);

    partial void OnCellSplineChanged(float[]? value)
    {
        OnPropertyChanged(nameof(HasOverride));
        UpdateVerdict();
    }

    partial void OnAverageSplineChanged(float[] value) => UpdateVerdict();
    partial void OnCellHistogramChanged(float[]? value) => UpdateVerdict();

    [RelayCommand]
    private void CreateOverride()
    {
        // Seed from THIS cell's histogram so the user gets a useful starting envelope.
        CellSpline = SplineCurve.CreateDefault(CellHistogram);
    }

    [RelayCommand]
    private void RemoveOverride()
    {
        CellSpline = null;
    }

    private void UpdateVerdict()
    {
        var hist = CellHistogram;
        if (hist == null || hist.Length == 0)
        {
            VerdictText = string.Empty;
            return;
        }

        var spline = CellSpline is { Length: SplineCurve.KnotCount } ? CellSpline : AverageSpline;
        if (spline is not { Length: SplineCurve.KnotCount })
        {
            VerdictText = string.Empty;
            return;
        }

        var (isGood, exceed) = LindtLeerformPlugin.Services.LeerformPatternRecognitionService
            .EvaluateAgainstSpline(hist, spline);
        var label = isGood ? "GOOD" : "BAD";
        var splineLabel = HasOverride ? "cell spline" : "average spline";
        VerdictText = $"Verdict: {label}   Max exceedance: {exceed:F4}   Using: {splineLabel}";
    }
}