using System;
using System.Collections.Generic;
using Avalonia.Media;
using CommunityToolkit.Mvvm.Input;

namespace DelauneyTriangulation.Models;

public static class Geometries
{
    public sealed class Point(double x, double y, double r = 3, Color? color = null)
    {
        public double X { get; } = x;
        public double Y { get; } = y;
        public double R { get; } = r;
        
        public Color Color { get; set; } = color ?? new Color(255, 255, 255, 255);
        
        public double Left => X - R;
        public double Top => Y - R;
        public double Size => 2 * R;
    }
    
    public sealed class PointComparer : IComparer<Point>
    {
        public static readonly PointComparer Instance = new();

        public int Compare(Point? a, Point? b)
        {
            if (ReferenceEquals(a, b)) return 0;
            if (a is null) return -1;
            if (b is null) return 1;

            int c = a.X.CompareTo(b.X);
            if (c != 0) return c;

            c = a.Y.CompareTo(b.Y);
            if (c != 0) return c;

            return a.R.CompareTo(b.R);
        }
    }

    public sealed class Edge(double x1, double y1, double x2, double y2)
    {
        public double X1 { get; } = x1;
        public double X2 { get; } = x2;
        public double Y1 { get; } = y1;
        public double Y2 { get; } = y2;
        
        public Avalonia.Point Start => new(X1, Y1);
        public Avalonia.Point End => new(X2, Y2);
    }

    public sealed class Circle(double x, double y, double r)
    {
        public double X { get; } = x;
        public double Y { get; } = y;
        public double R { get; } = r;
        
        public double Left => X - R;
        public double Top => Y - R;
        public double Diameter => 2 * R;
    }

    public sealed class Triangle(Point p1, Point p2, Point p3)
    {
        public Avalonia.Point X { get; } = new(p1.X, p1.Y);
        public Avalonia.Point Y { get; } = new(p2.X, p2.Y);
        public Avalonia.Point Z { get; } = new(p3.X, p3.Y);
        
        public IReadOnlyList<Avalonia.Point> Vertices =>  [ X, Y, Z ];
    }
}