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

namespace PamhagenSysCtrl.Helpers.Pipeline {
    public class Valve : INode {

        public const double DIAMETER = 24;

        public double CenterX { get; set; }
        public double CenterY { get; set; }
        public int Nr { get; set; }
        public string Label => $"V{Nr}";
        public Brush? Highlight { get; set; }

        public bool IsLocked { get; set; }
        public bool IsOpen => CallbackIsOpen();
        public bool WantOpen => CallbackWantOpen();
        public ISet<IEdge> Inputs { get; init; }
        public ISet<IEdge> Outputs { get; init; }

        protected Func<bool> CallbackIsOpen;
        protected Func<bool> CallbackWantOpen;

        private Shape? _circle;
        private TextBlock? _text;

        public Valve(int nr, double x, double y, Func<bool> cbOpen, Func<bool> cbWant) {
            CenterX = x;
            CenterY = y;
            Nr = nr;
            CallbackIsOpen = cbOpen;
            CallbackWantOpen = cbWant;
            Inputs = new HashSet<IEdge>();
            Outputs = new HashSet<IEdge>();
        }

        public void Draw(Canvas canvas) {
            _circle = new Ellipse() {
                Height = DIAMETER,
                Width = DIAMETER,
                Fill = Brushes.DarkGray,
                Stroke = Brushes.Black,
                StrokeThickness = 2,
            };
            _circle.SetValue(Canvas.LeftProperty, CenterX - DIAMETER / 2);
            _circle.SetValue(Canvas.TopProperty, CenterY - DIAMETER / 2);
            _text = new() {
                Text = Label,
                FontSize = 10,
                Width = DIAMETER,
                Height = DIAMETER,
                TextAlignment = TextAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            };
            _text.SetValue(Canvas.LeftProperty, CenterX - DIAMETER / 2);
            _text.SetValue(Canvas.TopProperty, CenterY - DIAMETER / 2 + 5.5);
            canvas.Children.Add(_circle);
            canvas.Children.Add(_text);
        }

        public bool IsInside(double x, double y) {
            return Math.Sqrt(Math.Pow(CenterX - x, 2) + Math.Pow(CenterY - y, 2)) <= DIAMETER / 2;
        }

        public void Update(bool isHovering, bool isPressed) {
            _circle?.Fill =
              IsLocked && !WantOpen && !IsOpen ? PamhagenBrushes.DimOrange :
              IsLocked && !WantOpen && IsOpen ? PamhagenBrushes.Red :
              IsLocked && WantOpen && !IsOpen ? PamhagenBrushes.Yellow :
              IsLocked && WantOpen && IsOpen ? PamhagenBrushes.Green :
              Highlight ?? (isHovering ? Brushes.LightGray : Brushes.DarkGray);
        }
    }
}