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 RADIUS = 24;

        public double CenterX { get; set; }
        public double CenterY { get; set; }
        public string Label { 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 Ellipse? _circle;
        private TextBlock? _text;

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

        public void Draw(Canvas canvas) {
            _circle = new() {
                Height = RADIUS,
                Width = RADIUS,
                Fill = Brushes.DarkGray,
                Stroke = Brushes.Black,
                StrokeThickness = 2,
            };
            _circle.SetValue(Canvas.LeftProperty, CenterX - RADIUS / 2);
            _circle.SetValue(Canvas.TopProperty, CenterY - RADIUS / 2);
            _text = new() {
                Text = Label,
                FontSize = 10,
                Width = RADIUS,
                Height = RADIUS,
                TextAlignment = TextAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            };
            _text.SetValue(Canvas.LeftProperty, CenterX - RADIUS / 2);
            _text.SetValue(Canvas.TopProperty, CenterY - RADIUS / 2 + 5);
            canvas.Children.Add(_circle);
            canvas.Children.Add(_text);
        }

        public bool Update(double x, double y) {
            var hover = Math.Sqrt(Math.Pow(CenterX - x, 2) + Math.Pow(CenterY - y, 2)) <= RADIUS / 2;
            _circle?.Fill = hover ? Brushes.LightGray : Brushes.DarkGray;
            return hover;
        }
    }
}