using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

namespace BouncyCatIsBouncy
{
    class Cannon : IDynamicObject
    {
        Vector2 m_position;
        SpriteBatch m_batch;
        Animation m_animation;
        Input<Activity> m_input;
        Cat m_cat;

        public Cannon(SpriteBatch batch, Cat cat, Input<Activity> input)
        {
            m_batch = batch;
            m_cat = cat;
            m_input = input;

            m_position = m_cat.Position;

            m_cat.OnLaunch += () => m_animation.Animating = true;
        }

        public void PointAt(Vector2 point)
        {
            m_animation.Rotation = (float)Math.Atan2(point.Y - m_position.Y, point.X - m_position.X) + MathHelper.PiOver2;
        }

        public void Draw()
        {
            m_animation.Draw();
        }


        public void LoadContent(ContentManager manager)
        {
            var texture = manager.Load<Texture2D>(@"Spritesheets/cannon");
            m_animation = new Animation(m_batch, texture, 512, 512);
            m_animation.Speed = 300f;
            m_animation.StopAtEnd = true;

            m_animation.Width = m_animation.Height = 128;
        }


        public void Update(float dt)
        {
            if (!m_cat.Launched)
                m_animation.Center = m_cat.Position;
            
            m_animation.Update(dt);

            PointAt(m_input.Cursor2DLocation);
        }
    }
}