package Sequenic.T2ext.CoverageEngine.ga;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Random;

import org.uncommons.watchmaker.framework.factories.AbstractCandidateFactory;

import Sequenic.T2.Obj.Cloner;
import Sequenic.T2.Seq.Trace;

/**
 * This class generates the initial population for the genetic algorithm.
 * 
 * @author Christiaan Hees
 */
public class TraceFactory extends AbstractCandidateFactory<Trace> {
	List<Trace> traces;
	private int counter;
	
	public TraceFactory(Collection<Trace> traces) {
		this.traces = new ArrayList<Trace>(traces);
		counter = 0;
	}
	
	/**
	 * Currently just returns one of the traces from the .tr file.
	 * TODO: we might need more than 1000 traces so perhaps we need
	 *       a real generator?
	 *       Looks like this factory only gets used to create the
	 *       initial population, so this should be fine...
	 */
	@Override
	protected Trace generateRandomCandidate(Random rng) {
		//System.out.println("DEBUG candidate count: "+counter);
		if(counter>=traces.size()) {
			System.out.println("Warning: More than "+traces.size()+" candidates requested.");
			counter = 0;
		}
		Trace trace = null;
		try {
			// We want a clone so we can safely modify it with the GA operators
			// FIXME: Is this really how you're supposed to clone traces?
			trace = Cloner.clone(traces.get(counter));
		} catch (Exception e) {
			System.out.println("Failed to clone trace "+trace);
			e.printStackTrace();
			System.exit(1);
		}
		counter++;
		return trace;
	}
}