using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace BouncyCatIsBouncy
{
    struct Button
    {
        Texture2D m_texture;
        bool m_isMouseOver, m_wasOver;

        public event OnSelectedHandler OnClick;
        public event OnSelectedHandler OnEnter;

        public Vector2 Center { get; set; }
        public int Width { get { return m_texture.Width; } }
        public int Height { get { return m_texture.Height; } }

        public Button(Texture2D texture)
            : this()
        {
            m_texture = texture;
        }

        public void Draw(SpriteBatch batch)
        {
            batch.Draw(m_texture, Center - new Vector2(m_texture.Width / 2, m_texture.Height / 2),
                m_isMouseOver ? Color.Red : Color.White);
        }

        public void Update(Input<Activity> input)
        {
            var rect = new Rectangle((int)Center.X - m_texture.Width / 2, (int)Center.Y - m_texture.Height / 2, m_texture.Width, m_texture.Height);
            var point = new Point((int)input.Cursor2DLocation.X, (int)input.Cursor2DLocation.Y);

            if (m_isMouseOver = rect.Contains(point))
            {
                if (!m_wasOver && OnEnter != null)
                {
                    OnEnter();
                }
                if (OnClick != null && input.IsActivityPressed(Activity.Launch))
                {
                    OnClick();
                }
            }
            m_wasOver = m_isMouseOver;
        }
    }
}