package Sequenic.T2ext.CoverageEngine.ga;

import java.lang.reflect.Method;
import java.util.List;

import Sequenic.T2.Seq.Trace;
import Sequenic.T2.Seq.TraceExecInfo;
import Sequenic.T2ext.CoverageEngine.BaseEngine;
import Sequenic.T2ext.Instrumenter.Sensor;

/**
 * This evaluator can get the fitness from a function defined by the programmer
 * himself. It will look for a method name ending in _ga and uses that method as
 * a fitness function. The method signature should be something like:
 * private double <name>_ga()
 * 
 * @author Christiaan Hees
 */
public class CustomEvaluator extends Evaluator {
	public static final String METHOD_EXTENSION = "_ga";
	
	private Method gaMethod;
	
	public CustomEvaluator(BaseEngine engine) {
		super(engine);
		for(Method m : engine.t2covAnalyzer.getC().getDeclaredMethods()) {
			if(m.getName().endsWith(METHOD_EXTENSION)) {
				gaMethod = m;
				containingMethod = m.getName().substring(0,
						m.getName().length() - METHOD_EXTENSION.length());
				// Only run the GA if it's the one for the method of this trace:
				//System.out.println("DEBUG CFG.getMethod: "+engine.CFG.getMethodName());
				if(containingMethod.equals(engine.CFG.getOriginalMethodName())) {
					break;
				}
				containingMethod = null;
			}
		}
	}
	
	public double getFitness(Trace candidate, List<? extends Trace> population) {
		Sensor.ejectObservations();
		TraceExecInfo info = engine.executeT2Trace(candidate);
		// TODO is this obj actually the one we need?
		Object obj = info.lastStepResult.receiverObj;
		gaMethod.setAccessible(true);
		try {
			return (Double) gaMethod.invoke(obj, (Object[])null);
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return 0;
	}

}