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/*
 *  Copyright (c) 2022 Contributors to the Eclipse Foundation
 *   All rights reserved. This program and the accompanying materials
 *   are made available under the terms of the Eclipse Public License v1.0
 *   and Apache License v2.0 which accompanies this distribution.
 *   The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 *   and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
 *
 *   You may elect to redistribute this code under either of these licenses.
 *
 *   Contributors:
 *
 *   Otavio Santana
 */
package org.eclipse.jnosql.mapping.graph.query;

import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.eclipse.jnosql.communication.query.SelectQuery;
import org.eclipse.jnosql.communication.query.method.SelectMethodProvider;
import org.eclipse.jnosql.mapping.metadata.EntityMetadata;

import java.util.function.BiFunction;

final class CountQueryConverter extends AbstractQueryConvert implements BiFunction {

    static final CountQueryConverter INSTANCE = new CountQueryConverter();

    private CountQueryConverter() {
    }

    @Override
    public Long apply(GraphQueryMethod graphQuery, Object[] params) {

        SelectQuery query = SelectMethodProvider.INSTANCE.apply(graphQuery.method(), graphQuery.entityName());
        EntityMetadata mapping = graphQuery.mapping();
        GraphTraversal traversal = getGraphTraversal(graphQuery, query::where, mapping);
        traversal.hasLabel(mapping.name());
        return traversal.count().next();
    }




}