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

namespace PamhagenSysCtrl.Helpers.Pipeline {
    public class Press : INode, ISink {

        public const double DIAMETER = 24;

        public double CenterX { get; set; }
        public double CenterY { get; set; }
        public string Label { get; set; }

        public ISet<IEdge> Inputs { get; set; }
        public ISet<IEdge> Outputs { get; set; }

        public double TopY => CenterY - DIAMETER / 2;
        public FillState FillState => CallbackFillState();
        public bool IsFull => FillState == FillState.Full;

        public int? CapacityLiters { get; set; }

        protected Func<FillState> CallbackFillState;

        private Polygon? _frame;
        private Ellipse? _circle;
        private TextBlock? _text;

        public Press(string label, double x, double y, int capacityLiters, Func<FillState> cbFillState) {
            CenterX = x;
            CenterY = y;
            Label = label;
            CapacityLiters = capacityLiters;
            CallbackFillState = cbFillState;
            Inputs = new HashSet<IEdge>();
            Outputs = new HashSet<IEdge>();
        }

        public void Draw(Canvas canvas) {
            _circle = new Ellipse() {
                Stroke = Brushes.Black,
                Fill = Brushes.WhiteSmoke,
            };
            _frame = new Polygon() {
                Stroke = Brushes.Black,
                Fill = Brushes.WhiteSmoke,
            };
            _text = new() {
                Text = CapacityLiters.HasValue ? $"{Label}\n{CapacityLiters:N0}"  : Label,
                TextAlignment = TextAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            };
            canvas.Children.Add(_frame);
            canvas.Children.Add(_circle);
            canvas.Children.Add(_text);
        }

        public void Scale(double scale) {
            var border = Graph.ToBorder(scale);
            _circle?.StrokeThickness = border;
            Graph.SetCenter(_circle, CenterX, CenterY, DIAMETER, DIAMETER, scale);
            _frame?.Points = [
                Graph.ToPx(CenterX - DIAMETER / 2 - 2, CenterY, scale), Graph.ToPx(CenterX + DIAMETER / 2 + 2, CenterY, scale),
                Graph.ToPx(CenterX + DIAMETER / 2 + 2, CenterY + DIAMETER / 2 + 6, scale), Graph.ToPx(CenterX + DIAMETER / 2 - 4, CenterY + DIAMETER / 2 + 6, scale),
                Graph.ToPx(CenterX + DIAMETER / 2 - 4, CenterY + DIAMETER / 2 + 2, scale), Graph.ToPx(CenterX - DIAMETER / 2 + 4, CenterY + DIAMETER / 2 + 2, scale),
                Graph.ToPx(CenterX - DIAMETER / 2 + 4, CenterY + DIAMETER / 2 + 6, scale), Graph.ToPx(CenterX - DIAMETER / 2 - 2, CenterY + DIAMETER / 2 + 6, scale),
            ];
            _frame?.StrokeThickness = border;
            _text?.FontSize = 14;
            _text?.Width = DIAMETER * scale;
            _text?.SetValue(Canvas.LeftProperty, (CenterX - DIAMETER / 2) * scale);
            _text?.SetValue(Canvas.TopProperty, (CenterY * scale) - (CapacityLiters.HasValue ? 20 : 10));
        }

        public bool IsInside(double x, double y) {
            return Math.Sqrt(Math.Pow(CenterX - x, 2) + Math.Pow(CenterY - y, 2)) <= DIAMETER / 2 || (Math.Abs(x - CenterX) <= DIAMETER / 2 + 10 && y >= CenterY && y <= CenterY + DIAMETER / 2 + 30);
        }

        public void Update(bool isHovering, bool isPressed) {
            var color =
                isHovering && isPressed ? Brushes.DarkGray :
                isHovering ? Brushes.LightGray :
                Brushes.WhiteSmoke;
            _circle?.Fill = PamhagenBrushes.ForFillState(FillState, color);
            _frame?.Fill = color;
        }
    }
}