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

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

        public INode Start { get; set; }
        public INode End { get; set; }
        public string? Label { get; set; }
        public bool IsTwoWay { get; set; }
        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 => Orientation ? Start.CenterX : End.CenterX;
        public double Y2 => Orientation ? End.CenterY : Start.CenterY;
        public double X3 => End.CenterX;
        public double Y3 => End.CenterY;

        private Polyline? _outer;
        private Polyline? _inner;
        private TextBlock? _text;
        private FlowArrows? _flowArrows;
        private double? _textOffsetX;

        public Pipe(INode start, INode end, string? label = null, bool orientation = false, bool twoWay = false, double? textOffsetX = null) {
            Start = start;
            End = end;
            Label = label;
            _textOffsetX = textOffsetX;
            Orientation = orientation;
            IsTwoWay = twoWay;
        }

        public void Draw(Canvas canvas) {
            _outer = new Polyline() {
                Stroke = Brushes.Black,
                StrokeStartLineCap = PenLineCap.Round,
                StrokeEndLineCap = PenLineCap.Round,
                StrokeLineJoin = PenLineJoin.Round,
            };
            _inner = new Polyline() {
                Stroke = Brushes.DarkGray,
                StrokeStartLineCap = PenLineCap.Round,
                StrokeEndLineCap = PenLineCap.Round,
                StrokeLineJoin = PenLineJoin.Round,
            };
            canvas.Children.Add(_outer);
            canvas.Children.Add(_inner);
            if (Label != null) {
                _text = new() {
                    Text = Label,
                    TextAlignment = TextAlignment.Center,
                    VerticalAlignment = VerticalAlignment.Bottom,
                    HorizontalAlignment = HorizontalAlignment.Center,
                    SnapsToDevicePixels = true,
                };
                canvas.Children.Add(_text);
            }
            _flowArrows = FlowArrows.Create(canvas, _inner);
        }

        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;
            _text?.FontSize = 12;
            _text?.Width = 10 * scale;
            _text?.SetValue(Canvas.LeftProperty, (_textOffsetX != null ? (Orientation ? X2 : X1) + _textOffsetX : (Orientation ? (X2 + X3) / 2 : (X1 + X2) / 2) - 5) * scale);
            _text?.SetValue(Canvas.TopProperty, Y2 * scale - 22);
        }

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