using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tutorial020.Models;

namespace Tutorial020.Managers
{
  public class AnimationManager : ICloneable
  {
    private Animation _animation;

    private float _timer;

    public Animation CurrentAnimation
    {
      get
      {
        return _animation;
      }
    }

    public float Layer { get; set; }

    public Vector2 Origin { get; set; }

    public Vector2 Position { get; set; }

    public float Rotation { get; set; }

    public float Scale { get; set; }

    public AnimationManager(Animation animation)
    {
      _animation = animation;

      Scale = 1f;
    }

    public void Draw(SpriteBatch spriteBatch)
    {
      spriteBatch.Draw(
        _animation.Texture,
        Position,
        new Rectangle(
          _animation.CurrentFrame * _animation.FrameWidth,
          0,
          _animation.FrameWidth,
          _animation.FrameHeight
          ),
        Color.White,
        Rotation,
        Origin,
        Scale,
        SpriteEffects.None,
        Layer
        );
    }

    public void Play(Animation animation)
    {
      if (_animation == animation)
        return;

      _animation = animation;

      _animation.CurrentFrame = 0;

      _timer = 0;
    }

    public void Stop()
    {
      _timer = 0f;

      _animation.CurrentFrame = 0;
    }

    public void Update(GameTime gameTime)
    {
      _timer += (float)gameTime.ElapsedGameTime.TotalSeconds;

      if(_timer > _animation.FrameSpeed)
      {
        _timer = 0f;

        _animation.CurrentFrame++;

        if (_animation.CurrentFrame >= _animation.FrameCount)
          _animation.CurrentFrame = 0;
      }
    }

    public object Clone()
    {
      var animationManager = this.MemberwiseClone() as AnimationManager;

      animationManager._animation = animationManager._animation.Clone() as Animation;

      return animationManager;
    }
  }
}