using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;

namespace PamhagenSysCtrl.Helpers.Pipeline {
    public class Inlet : IEdge {

        public INode Start { get; set; }
        public INode End => Sink;
        public ISink Sink { get; set; }
        public string? Label => null;
        public bool IsTwoWay => false;
        public bool Orientation { get; set; }
        public Brush? Highlight { get; set; }
        public (bool TowardEnd, double PathOffset)? Flow { get; set; }
        public double FlowLength => _flowArrows?.Length ?? 0;

        public double X1 => Start.CenterX;
        public double Y1 => Start.CenterY;
        public double X2 => Start.CenterX;
        public double Y2 => Orientation ? Sink.CenterY - 2 : Sink.TopY - 2;
        public double X3 => Orientation ? Sink.CenterX : Start.CenterX + (Start.CenterX == End.CenterX ? 0 : Start.CenterX > End.CenterX ? -4 : 4);
        public double Y3 => Orientation ? Sink.CenterY - 2 : Sink.TopY + 4;

        private Polyline? _outer;
        private Polyline? _inner;
        private FlowArrows? _flowArrows;

        public Inlet(INode start, ISink end, bool orientation = false) {
            Start = start;
            Sink = end;
            Orientation = orientation;
        }

        public void Draw(Canvas canvas) {
            _outer = new Polyline() {
                Stroke = Brushes.Black,
                StrokeStartLineCap = PenLineCap.Round,
                StrokeLineJoin = PenLineJoin.Round,
                StrokeEndLineCap = PenLineCap.Flat,
            };
            _inner = new Polyline() {
                Stroke = Brushes.DarkGray,
                StrokeStartLineCap = PenLineCap.Round,
                StrokeLineJoin = PenLineJoin.Round,
                StrokeEndLineCap = PenLineCap.Flat,
            };
            canvas.Children.Add(_outer);
            canvas.Children.Add(_inner);
            _flowArrows = FlowArrows.Create(canvas, [new(X1, Y1), new(X2, Y2), new(X3, Y3)]);
        }

        public void Scale(double scale) {
            var border = Graph.ToBorder(scale);
            _outer?.Points = [Graph.ToPx(X1, Y1, scale), Graph.ToPx(X2, Y2, scale), Graph.ToPx(X3, Y3, scale)];
            _inner?.Points = [Graph.ToPx(X1, Y1, scale), Graph.ToPx(X2, Y2, scale), Graph.ToPx(X3, Y3, scale)];
            _inner?.StrokeThickness = Math.Round(1.2 * scale / 2) * 2;
            _outer?.StrokeThickness = Math.Round(1.2 * scale / 2) * 2 + border * 2;
            _flowArrows?.Scale(scale);
        }

        public void Update() {
            _inner?.Stroke = Highlight ?? Brushes.DarkGray;
            _flowArrows?.Update(Flow);
        }
    }
}