using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace CarFire
{
    public class AnimatedTexture
    {
        private int framecount;
        private Texture2D myTexture;
        private float TimePerFrame;
        private int Frame, Row;
        private float TotalElapsed;
        private bool Paused, loop;

        public float Rotation, Scale, Depth;
        public Vector2 Origin;

        //rotation is pretty much always zero, scale determines size, depth is 0.5f
        public AnimatedTexture(Vector2 Origin, float Rotation, float Scale, float Depth)
        {
            this.Origin = Origin;
            this.Rotation = Rotation;
            this.Scale = Scale;
            this.Depth = Depth;
        }
        //asset is the file name w/o the extension, framecount is the # of frames per row, framespersec determines speed of the animation
        //loop will determine if the animation repeats, row chooses which row of the animation to play starting with 0
        public void Load(GraphicsDevice device, ContentManager content, string asset, int FrameCount, int FramesPerSec, bool Loop, int row)
        {
            framecount = FrameCount;
            myTexture = content.Load<Texture2D>(asset);
            TimePerFrame = (float)1 / FramesPerSec;
            Frame = 0;
            TotalElapsed = 0;
            Paused = false;
            loop = Loop;
            Row = row;
        }

        // class AnimatedTexture
        public void UpdateFrame(TimeSpan timeSpan)
        {
            float elapsed = timeSpan.Milliseconds;
            if (Paused)
                return;
            TotalElapsed += elapsed;
            if (TotalElapsed > TimePerFrame)
            {
                Frame++;
                // Keep the Frame between 0 and the total frames, minus one.
                if (framecount != 0)
                    Frame = Frame % framecount;
                else
                    Console.WriteLine("AHHH!");
                TotalElapsed -= TimePerFrame;
            }
            //If loop is false and the current Frame is the last frame 
            //then stop playing the animation
            if ((Frame == framecount - 1) && loop == false)
                Pause();

        }

        // class AnimatedTexture
        public void DrawFrame(SpriteBatch Batch, Vector2 screenpos)
        {
            DrawFrame(Batch, Frame, screenpos);
        }
        public void DrawFrame(SpriteBatch Batch, int frame, Vector2 screenpos)
        {

            int FrameWidth = myTexture.Width / framecount;
            Rectangle sourcerect = new Rectangle(FrameWidth * Frame, Row * 64,
                FrameWidth, 64);
            Console.WriteLine(Frame);
            Batch.Draw(myTexture, screenpos, sourcerect, Color.White,
                Rotation, Origin, Scale, SpriteEffects.None, Depth);
        }

        public bool IsPaused
        {
            get { return Paused; }
        }
        public void Reset()
        {
            Frame = 0;
            TotalElapsed = 0f;
        }
        public void Stop()
        {
            Pause();
            Reset();
        }
        public void Play()
        {
            Paused = false;
        }
        public void Pause()
        {
            Paused = true;

        }

    }
}