package stoppers;

import java.lang.*;
import java.io.*;
import main.BetterTokenizer;
import main.Cell;
import main.GeneralInput;
import main.Model;

/** A stopper that measures the maximum ratio between a node's concentration
	in two different cells over some time. To avoid large ratio's simply do
	to very small concentrations, the ratio is calculated as 
	(C(1) + epsilon) / (C(2) + epsilon)
	where epsilon is some small value.
@author Eli
@version 3/19/99
*/
public class FindMaxRatioStop extends SimpleStop	{
	int			nodeNum;
	float		interval;
	int			xPos, yPos, xPos2, yPos2;
	
	/** A number added to numerator and denominator of ratio to prevent large ratios simply
		do to small numbers. */
	float		epsilon;
	

	// No arg constructor for instantiating by name
	public FindMaxRatioStop() { stopTime = 1; }
	
	public FindMaxRatioStop(float stop_time) {
		stopTime = stop_time;
	}
	
	public boolean stop(float time) {

		// trivial reasons to return
		if(time < lastTime + interval)	return false;
		if(time > stopTime) return true;

		float ratio = (model.cells[yPos * model.arrayWidth + xPos].getValue(nodeNum) + epsilon)/
					(model.cells[yPos2 * model.arrayWidth + xPos2].getValue(nodeNum) + epsilon);
		if(ratio > score) score = ratio;
		else if(1 / ratio > score) score = 1 / ratio;
				
		lastTime = time;
		return false;
	}
	
	public boolean didPass(float s)  { return didPass(); }
	public boolean didPass()  {
		return true;
	}

	protected void loadParameter(String info, BetterTokenizer tokenizer) throws Exception {
		if(info.equals("Node")) { GeneralInput.nextToken(tokenizer); nodeNum = model.cells[0].getNodeNum(tokenizer.sval); }
		else if(info.equals("Epsilon")) { GeneralInput.nextToken(tokenizer); epsilon = ((float)tokenizer.nval); }
		else if(info.equals("XPos")) { GeneralInput.nextToken(tokenizer); xPos = ((int)tokenizer.nval); }
		else if(info.equals("YPos")) { GeneralInput.nextToken(tokenizer); yPos = ((int)tokenizer.nval); }
		else if(info.equals("XPos2")) { GeneralInput.nextToken(tokenizer); xPos2 = ((int)tokenizer.nval); }
		else if(info.equals("YPos2")) { GeneralInput.nextToken(tokenizer); yPos2 = ((int)tokenizer.nval); }
		else if(info.equals("Interval")) { GeneralInput.nextToken(tokenizer); interval = (float)tokenizer.nval; }

		else super.loadParameter(info,tokenizer);
	}
			
}