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;

        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) {
            var x1 = Start.CenterX;
            var y1 = Start.CenterY;
            var x2 = Orientation ? Start.CenterX : End.CenterX;
            var y2 = Orientation ? End.CenterY : Start.CenterY;
            var x3 = End.CenterX;
            var y3 = End.CenterY;
            _outer = new Polyline() {
                Points = [new(x1, y1), new(x2, y2), new(x3, y3)],
                StrokeThickness = 10,
                Stroke = Brushes.Black,
                StrokeStartLineCap = PenLineCap.Round,
                StrokeEndLineCap = PenLineCap.Round,
                StrokeLineJoin = PenLineJoin.Round,
            };
            _inner = new Polyline() {
                Points = [new(x1, y1), new(x2, y2), new(x3, y3)],
                StrokeThickness = 6,
                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,
                    FontSize = 12,
                    Width = 50,
                    TextAlignment = TextAlignment.Center,
                    VerticalAlignment = VerticalAlignment.Bottom,
                    HorizontalAlignment = HorizontalAlignment.Center,
                    SnapsToDevicePixels = true,
                };
                _text.SetValue(Canvas.LeftProperty, _textOffsetX != null ? (Orientation ? x2 : x1) + _textOffsetX : (Orientation ? (x2 + x3) / 2 : (x1 + x2) / 2) - 25);
                _text.SetValue(Canvas.TopProperty, y2 - 22);
                canvas.Children.Add(_text);
            }
            _flowArrows = FlowArrows.Create(canvas, _inner);
        }

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