package org.junit.tests.experimental.theories.extendingwithstubs;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.junit.experimental.theories.PotentialAssignment;
import org.junit.internal.AssumptionViolatedException;

public class GuesserQueue extends ArrayList<ReguessableValue> {
    static class ReguessableDecorator extends ReguessableValue {
        private final PotentialAssignment delegate;

        public ReguessableDecorator(PotentialAssignment delegate) {
            this.delegate = delegate;
        }

        @Override
        public List<ReguessableValue> reguesses(AssumptionViolatedException e) {
            return Collections.emptyList();
        }

        @Override
        public Object getValue() throws CouldNotGenerateValueException {
            return delegate.getValue();
        }

        @Override
        public String getDescription() throws CouldNotGenerateValueException {
            return delegate.getDescription();
        }
    }

    static GuesserQueue forSingleValues(
            List<PotentialAssignment> potentials) {
        GuesserQueue returnThis = new GuesserQueue();
        for (PotentialAssignment potentialParameterValue : potentials) {
            returnThis
                    .add(new GuesserQueue.ReguessableDecorator(potentialParameterValue));
        }
        return returnThis;
    }

    private static final long serialVersionUID = 1L;
    private ReguessableValue lastRemoved;

    public void update(AssumptionViolatedException e) {
        if (lastRemoved != null) {
            addAll(lastRemoved.reguesses(e));
        }
    }

    @Override
    public ReguessableValue remove(int index) {
        lastRemoved = super.remove(index);
        return lastRemoved;
    }
}