using System.Diagnostics;
using Microsoft.Xna.Framework;

namespace BouncyCatIsBouncy
{
    class PhysicsGeom
    {
        PhysicsBody m_body;
        ICollidable m_bounding;
        Vector2 m_offset;

        public PhysicsBody Body { get { return m_body; } }
        public ICollidable Bounding
        {
            get { return m_bounding; }
            set { m_bounding = value; }
        }

        public PhysicsGeom(PhysicsBody body, ICollidable bounding)
            : this(body, bounding, Vector2.Zero)
        {
        }
        public PhysicsGeom(PhysicsBody body, ICollidable bounding, Vector2 offset)
        {
            Debug.Assert(body != null);
            m_bounding = bounding;

            body.Geometry.Add(this);
            m_offset = offset;
            m_body = body;
        }

        private void UpdateBoundingPosition()
        {
            m_bounding.Center = m_body.Position + m_offset;
        }

        public CollisionInfo BroadCollides(PhysicsGeom other)
        {
            UpdateBoundingPosition();
            other.UpdateBoundingPosition();
            return m_bounding.Collides((RadialBB)other.Bounding);
        }
    }
}