using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;

namespace TileEngine
{
    public class FrameAnimation : ICloneable
    {
        Rectangle[] frames;
        int currentFrame = 0;

        float frameLenght = 0.5f;
        float timer = 0;

        public float FramesPerSecond
        {
            get
            {
                return 1f / frameLenght;
            }
            set
            {
                frameLenght = (float)Math.Max(1f / (float)value, .001f);
            }
        }

        public Rectangle CurrentRect
        {
            get { return frames[currentFrame]; }
        }
        public int CurrentFrame
        {
            get { return currentFrame; }
            set
            {
                currentFrame = (int)MathHelper.Clamp(value, 0, frames.Length - 1);
            }
        }

        public FrameAnimation(
            int numberOfFrames,
            int frameWidth,
            int frameHeight,
            int xOffset,
            int yOffset)
        {
            frames = new Rectangle[numberOfFrames];

            for (int i = 0; i < numberOfFrames; i++)
            {
                Rectangle rect = new Rectangle();
                rect.Width = frameWidth;
                rect.Height = frameHeight;
                rect.X = xOffset + (i * frameWidth);
                rect.Y = yOffset;

                frames[i] = rect;
            }
        }

        private FrameAnimation()
        {

        }

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

            if (timer >= frameLenght)
            {
                timer = 0f;

                currentFrame++;
                if (currentFrame >= frames.Length)
                    currentFrame = 0;
            }
        }

        public object Clone()
        {
            FrameAnimation anim = new FrameAnimation();

            anim.frameLenght = frameLenght;
            anim.frames = frames;

            return anim;
        }
    }
}