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

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

        public const double WIDTH = 120;
        public const double HEIGHT = 60;

        public double CenterX { get; set; }
        public double CenterY { get; set; }
        public string Label { get; set; }
        public ISet<IEdge> Inputs { get; init; }
        public ISet<IEdge> Outputs { get; init; }

        public bool IsActive { get; set; }

        private TextBlock? _text;
        private Shape? _rect;
        private Shape? _hopperOuter;
        private Shape? _hopperInner;
        private Shape? _bottomInner;
        private Shape? _bottomOuter;

        public Rebler(string label, double x, double y) {
            CenterX = x;
            CenterY = y;
            Label = label;
            Inputs = new HashSet<IEdge>();
            Outputs = new HashSet<IEdge>();
        }

        public void Draw(Canvas canvas) {
            _rect = new Rectangle() {
                Width = WIDTH,
                Height = HEIGHT,
                Fill = Brushes.WhiteSmoke,
                Stroke = Brushes.Black,
                StrokeThickness = 2,
            };
            var left = CenterX - WIDTH / 2;
            var right = CenterX + WIDTH / 2;
            var top = CenterY - HEIGHT / 2;
            var bottom = CenterY + HEIGHT / 2;
            var hx = right - 20;
            var h = 15;
            var w = 25;
            _hopperOuter = new Polygon() {
                Points = [new(hx - w, top - h), new(hx - w + 5, top + 2), new(hx + w - 5, top + 2), new(hx + w, top - h)],
                Fill = Brushes.Black,
            };
            _hopperInner = new Polygon() {
                Points = [new(hx - w + 2, top - h), new(hx - w + 5 + 2, top + 2), new(hx + w - 5 - 2, top + 2), new(hx + w - 2, top - h)],
                Fill = Brushes.WhiteSmoke,
            };
            _bottomOuter = new Polygon() {
                Points = [new(left + 20, bottom), new(right - 20, bottom), new(right - 15, bottom + 10), new(left + 15, bottom + 10)],
                Fill = Brushes.Black,
            };
            _bottomInner = new Polygon() {
                Points = [new(left + 20 + 2, bottom), new(right - 20 - 2, bottom), new(right - 15 - 2, bottom + 10), new(left + 15 + 2, bottom + 10)],
                Fill = Brushes.WhiteSmoke,
            };
            _text = new() {
                Text = Label,
                FontSize = 12,
                Width = WIDTH,
                TextAlignment = TextAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            };
            _rect.SetValue(Canvas.LeftProperty, CenterX - WIDTH / 2);
            _rect.SetValue(Canvas.TopProperty, CenterY - HEIGHT / 2);
            _text.SetValue(Canvas.LeftProperty, CenterX - WIDTH / 2);
            _text.SetValue(Canvas.TopProperty, CenterY - 8);
            canvas.Children.Add(_hopperOuter);
            canvas.Children.Add(_bottomOuter);
            canvas.Children.Add(_rect);
            canvas.Children.Add(_hopperInner);
            canvas.Children.Add(_bottomInner);
            canvas.Children.Add(_text);
        }

        public bool IsInside(double x, double y) {
            return Math.Abs(x - CenterX) <= WIDTH / 2 && Math.Abs(y - CenterY) <= HEIGHT / 2;
        }

        public void Update(bool isHovering, bool isPressed) {
            var color =
                IsActive && isHovering && isPressed ? PamhagenBrushes.Red :
                IsActive && isHovering ? PamhagenBrushes.Red :
                !IsActive && isHovering && isPressed ? PamhagenBrushes.Green :
                !IsActive && isHovering ? PamhagenBrushes.Green :
                IsActive ? PamhagenBrushes.Green :
                Brushes.WhiteSmoke;
            _rect?.Fill = color;
            _hopperInner?.Fill = color;
            _bottomInner?.Fill = color;
        }
    }
}