/*
 * Copyright (c) 2011-2015 EPFL DATA Laboratory
 * Copyright (c) 2014-2015 The Squall Collaboration (see NOTICE)
 *
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ch.epfl.data.squall.visitors;

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

import ch.epfl.data.squall.expressions.ValueExpression;
import ch.epfl.data.squall.predicates.AndPredicate;
import ch.epfl.data.squall.predicates.BetweenPredicate;
import ch.epfl.data.squall.predicates.ComparisonPredicate;
import ch.epfl.data.squall.predicates.LikePredicate;
import ch.epfl.data.squall.predicates.OrPredicate;
import ch.epfl.data.squall.predicates.Predicate;
import ch.epfl.data.squall.predicates.booleanPrimitive;

public class PredicateUpdateIndexesVisitor implements PredicateVisitor {

    private final List<String> _tuple;

    private final boolean _comeFromFirstEmitter;

    public ArrayList<String> _valuesToIndex;
    public ArrayList<Object> _typesOfValuesToIndex;

    public PredicateUpdateIndexesVisitor(boolean comeFromFirstEmitter,
	    List<String> tuple) {
	_comeFromFirstEmitter = comeFromFirstEmitter;
	_tuple = tuple;

	_valuesToIndex = new ArrayList<String>();
	_typesOfValuesToIndex = new ArrayList<Object>();
    }

    @Override
    public void visit(AndPredicate and) {
	for (final Predicate pred : and.getInnerPredicates())
	    visit(pred);
    }

    @Override
    public void visit(BetweenPredicate between) {
	// In between there is only an and predicate
	final Predicate p = (Predicate) between.getInnerPredicates().get(0);
	visit(p);
    }

    @Override
    public void visit(booleanPrimitive bool) {

    }

    @Override
    public void visit(ComparisonPredicate comparison) {
	ValueExpression val;

	if (_comeFromFirstEmitter)
	    val = (ValueExpression) comparison.getExpressions().get(0);
	else
	    val = (ValueExpression) comparison.getExpressions().get(1);

	_valuesToIndex.add(val.eval(_tuple).toString());
	_typesOfValuesToIndex.add(val.getType().getInitialValue());
    }

    @Override
    public void visit(LikePredicate like) {
	throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public void visit(OrPredicate or) {
	for (final Predicate pred : or.getInnerPredicates())
	    visit(pred);
    }

    public void visit(Predicate pred) {
	pred.accept(this);
    }

}