module Mapping.AnimatedTile;

/* Copyright (C) 2005 Nate Plumm */

private import Drawing, Utilities.Tiles, Utilities.Timer;

public struct AnimatedTile
{
	private:
		
		Rectangle[] sourceRects;
		byte animSpeed;
		int frameCount = 0;
		long lastTickUsed = 0;
		int tileNumber = 0;
		int currentOffset = 0;
		
	public:
	
		bit useSecondSheet;
	
		static AnimatedTile opCall(int tileNumber, byte animSpeed, ushort[] animFrames, int frameCount)
		{
			AnimatedTile t;
			t.Setup(tileNumber, animSpeed, animFrames, frameCount);
			return t;
		}
		
		void Setup(int tileNumber, byte animSpeed, ushort[] animFrames, int frameCount)
		{
			this.tileNumber = tileNumber;
			this.animSpeed = animSpeed;
			this.frameCount = frameCount;
			sourceRects.length = frameCount;
			
			for(int i = 0; i < frameCount; i++)
				sourceRects[i] = Tiles.TileNumberToRectangle(animFrames[i], useSecondSheet);
		}
	
		Rectangle GetSourceRectangle(int offset)
		{
			if(this.currentOffset + offset < sourceRects.length)
			{
				return sourceRects[this.currentOffset];
			}
			else
			{
				return sourceRects[0];
			}
		}
		
		void TimerElapsed(long expectedTime, long realTime) // This is called from a different thread
		{
			if(CurrentTick() - lastTickUsed > (15 * animSpeed))
			{
				if(this.currentOffset + 1 < sourceRects.length)
					this.currentOffset++;
				else
					this.currentOffset = 0;
					
				this.lastTickUsed = CurrentTick();		
			}
		}
}