package parameterrules;

import java.io.*;
import java.lang.Math;
import main.BetterTokenizer;
import main.GeneralInput;
import parameters.ParameterSet;

/** Implements the rule that the ratio of two products of input parameters has to lie between
	lowerBound <= ratio <= upperBound.
*/
public class RatioBetweenRule extends ParameterRule {
	/** These store the lower and upper bounds that the ratio of the parameters have to be between (inclusive of edges) */
	private	float	lowerBound, upperBound;
	private int	[]	denomNums = new int[5];
	private int		numDenoms = 0;
	
	RatioBetweenRule() {}
	
	public ParameterRule copy() {
		RatioBetweenRule pr = (RatioBetweenRule)super.copy();
		pr.denomNums = new int[numDenoms];
		System.arraycopy(denomNums, 0, pr.denomNums, 0, numDenoms);
		return pr;
	}
	
	public float getFuzzyScore(float [] params) {
		float	val = 1f;
		
		for(int i = 0; i < numParams; i++)	{
			val *= params[paramNums[i]];
		}
		for(int i = 0; i < numDenoms; i++)	{
			val /= params[denomNums[i]];
		}
		if((val < lowerBound) && (val > lowerBound / 10)) return (float)((Math.log((double)(lowerBound/val)))/Math.log((double)10));
		else if(val <= lowerBound / 10) return 1.0f;
		else if((val > upperBound) && (val < 10 * upperBound)) return (float)((Math.log((double)(val/upperBound)))/Math.log((double)10));
		else if(val >= 10 * upperBound) return 1.0f;
		// not the most ideal fuzzy score but it'll do.
		else return 0f;
	}
	
	
	public boolean changeParameters(float [] params, int mode, ParameterSet set) {
		System.out.println("changeParameters not yet implemented for RatioBetweenRule");
		return isGood(params);
	}

	protected void loadParameter(String info, BetterTokenizer tokenizer) throws Exception	{
		if(info.equals("Param"))	{
			System.out.println("RatioBetweenRule ignoring inappropriate parameter specification");
		}	
		else if(info.equals("Numerator"))	{
			if(numParams == paramNums.length) {
				// Expand array length
				int	[] temp = new int[paramNums.length + 5];
				System.arraycopy(paramNums, 0, temp, 0, numParams);
				paramNums = temp;
			}
			GeneralInput.nextToken(tokenizer);
			paramNums[numParams] = refParams.getPosition(tokenizer.sval);	// Should throw exception if param doesn't exist
			numParams++;
		}			
		else if(info.equals("Denominator"))	{
			if(numDenoms == denomNums.length) {
				// Expand array length
				int	[] temp = new int[denomNums.length + 5];
				System.arraycopy(denomNums, 0, temp, 0, numDenoms);
				denomNums = temp;
			}
			GeneralInput.nextToken(tokenizer);
			denomNums[numDenoms] = refParams.getPosition(tokenizer.sval);	// Should throw exception if param doesn't exist
			numDenoms++;
		}
		else if(info.equals("LowerBound")) {
			GeneralInput.nextToken(tokenizer);
			lowerBound = (float)tokenizer.nval;
		}
		else if(info.equals("UpperBound")) {
			GeneralInput.nextToken(tokenizer);
			upperBound = (float)tokenizer.nval;
		}
		else super.loadParameter(info, tokenizer);
	}
}