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 = 24;
        public const double HEIGHT = 12;

        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 => CallbackActive();

        protected Func<bool> CallbackActive;

        private TextBlock? _text;
        private Rectangle? _rect;
        private Polygon? _hopperOuter;
        private Polygon? _hopperInner;
        private Polygon? _bottomInner;
        private Polygon? _bottomOuter;

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

        public void Draw(Canvas canvas) {
            _rect = new Rectangle() {
                Fill = Brushes.WhiteSmoke,
                Stroke = Brushes.Black,
                StrokeThickness = 2,
            };
            _hopperOuter = new Polygon() {
                Fill = Brushes.Black,
            };
            _hopperInner = new Polygon() {
                Fill = Brushes.WhiteSmoke,
            };
            _bottomOuter = new Polygon() {
                Fill = Brushes.Black,
            };
            _bottomInner = new Polygon() {
                Fill = Brushes.WhiteSmoke,
            };
            _text = new() {
                Text = Label,
                TextAlignment = TextAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            };
            canvas.Children.Add(_hopperOuter);
            canvas.Children.Add(_bottomOuter);
            canvas.Children.Add(_bottomInner);
            canvas.Children.Add(_rect);
            canvas.Children.Add(_hopperInner);
            canvas.Children.Add(_text);
        }

        public void Scale(double scale) {
            var border = Graph.ToBorder(scale);
            Graph.SetCenter(_rect, CenterX, CenterY, WIDTH, HEIGHT, scale);
            _rect?.StrokeThickness = border;

            var left = CenterX - WIDTH / 2;
            var right = CenterX + WIDTH / 2;
            var top = CenterY - HEIGHT / 2;
            var bottom = CenterY + HEIGHT / 2;
            var hx = right - 4;
            var h = 3;
            var w = 5;
            _hopperOuter?.Points = [Graph.ToPx(hx - w, top - h, scale), Graph.ToPx(hx - w + 1, top, scale, dypx: border), Graph.ToPx(hx + w - 1, top, scale, dypx: border), Graph.ToPx(hx + w, top - h, scale)];
            _hopperInner?.Points = [Graph.ToPx(hx - w, top - h, scale, dxpx: border), Graph.ToPx(hx - w + 1, top, scale, dxpx: border, dypx: border), Graph.ToPx(hx + w - 1, top, scale, dxpx: -border, dypx: border), Graph.ToPx(hx + w, top - h, scale, dxpx: -border)];
            _bottomOuter?.Points = [Graph.ToPx(left + 5, bottom - 1, scale), Graph.ToPx(right - 5, bottom - 1, scale), Graph.ToPx(right - 3, bottom + 2, scale), Graph.ToPx(left + 3, bottom + 2, scale)];
            _bottomInner?.Points = [Graph.ToPx(left + 5, bottom - 1, scale, dxpx: border), Graph.ToPx(right - 5, bottom - 1, scale, dxpx: -border), Graph.ToPx(right - 3, bottom + 2, scale, dxpx: -border), Graph.ToPx(left + 3, bottom + 2, scale, dxpx: border)];

            _text?.FontSize = 12;
            _text?.Width = WIDTH * scale;
            _text?.SetValue(Canvas.LeftProperty, (CenterX - WIDTH / 2) * scale);
            _text?.SetValue(Canvas.TopProperty, (CenterY * scale) - 8);
        }

        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;
        }
    }
}