using System;
using Chernobyl.Mathematics.Geometry;

namespace Chernobyl.Mathematics.Collision
{
    /// <summary>
    /// An interface for types that can collide with 2D objects.
    /// </summary>
    public interface ICollidable2D
        : IExtendedCollidable<Circle>, IExtendedCollidable<Rectangle>,
        IExtendedCollidable<Point2D>
    { }

    /// <summary>
    /// Utility and extension methods for <see cref="ICollidable2D"/>.
    /// </summary>
    public static class Collidable2D
    {
        /// <summary>
        /// Tests for a collision between this <paramref name="collidable"/> and <paramref name="shape"/>
        /// by doing a type check on <paramref name="shape"/> to determine the method of collision
        /// check.
        /// </summary>
        public static bool IsColliding(this ICollidable2D collidable, IShape shape)
        {
            switch (shape)
            {
                case Circle circle: return collidable.IsColliding(circle);
                case Rectangle rect: return collidable.IsColliding(rect);
                case Point2D point: return collidable.IsColliding(point);
                default: throw new ArgumentException(
                    $"Unable to perform collision check. Unknown {nameof(IShape)} type.", nameof(shape));
            }
        }
    }
}