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

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

        public const double POINT = 3.2;

        public INode Start => Source;
        public INode End { get; set; }
        public ISource Source { 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 => Source.BottomY;
        public double X2 => Orientation ? Start.CenterX : End.CenterX;
        public double Y2 => Orientation ? End.CenterY : Start.CenterY;
        public double X3 => End.CenterX;
        public double Y3 => End.CenterY;

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

        public Outlet(ISource start, INode end) {
            Source = start;
            End = end;
            Orientation = true;
        }

        public void Draw(Canvas canvas) {
            _hopper = new Polygon() {
                Fill = Brushes.DarkGray,
                Stroke = Brushes.Black,
            };
            _outer = new Polyline() {
                Stroke = Brushes.Black,
                StrokeStartLineCap = PenLineCap.Round,
                StrokeLineJoin = PenLineJoin.Round,
                StrokeEndLineCap = PenLineCap.Round,
            };
            _inner = new Polyline() {
                Stroke = Brushes.DarkGray,
                StrokeStartLineCap = PenLineCap.Round,
                StrokeLineJoin = PenLineJoin.Round,
                StrokeEndLineCap = PenLineCap.Round,
            };
            canvas.Children.Add(_outer);
            canvas.Children.Add(_hopper);
            canvas.Children.Add(_inner);
            _flowArrows = FlowArrows.Create(canvas, _inner);
        }

        public void Scale(double scale) {
            var border = Graph.ToBorder(scale);
            _hopper?.Points = [Graph.ToPx(X1 - POINT, Y1, scale, dypx: -border * 2), Graph.ToPx(X1 + POINT, Y1, scale, dypx: -border * 2), Graph.ToPx(X1, Y1 + POINT, scale)];
            _hopper?.StrokeThickness = border;
            _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;
        }

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