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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.metamodel.elasticsearch.rest;

import io.searchbox.core.DeleteByQuery;
import org.apache.metamodel.MetaModelException;
import org.apache.metamodel.delete.AbstractRowDeletionBuilder;
import org.apache.metamodel.delete.RowDeletionBuilder;
import org.apache.metamodel.elasticsearch.common.ElasticSearchUtils;
import org.apache.metamodel.query.FilterItem;
import org.apache.metamodel.query.LogicalOperator;
import org.apache.metamodel.schema.Table;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.util.List;

/**
 * {@link RowDeletionBuilder} implementation for
 * {@link ElasticSearchRestDataContext}.
 */
final class JestElasticSearchDeleteBuilder extends AbstractRowDeletionBuilder {
    private final JestElasticSearchUpdateCallback _updateCallback;

    public JestElasticSearchDeleteBuilder(JestElasticSearchUpdateCallback updateCallback, Table table) {
        super(table);
        _updateCallback = updateCallback;
    }

    @Override
    public void execute() throws MetaModelException {
        final Table table = getTable();
        final String documentType = table.getName();

        final ElasticSearchRestDataContext dataContext = _updateCallback.getDataContext();
        final String indexName = dataContext.getIndexName();

        final List whereItems = getWhereItems();

        // delete by query - note that creteQueryBuilderForSimpleWhere may
        // return matchAllQuery() if no where items are present.
        final QueryBuilder queryBuilder = ElasticSearchUtils.createQueryBuilderForSimpleWhere(whereItems,
                LogicalOperator.AND);
        if (queryBuilder == null) {
            // TODO: The where items could not be pushed down to a query. We
            // could solve this by running a query first, gather all
            // document IDs and then delete by IDs.
            throw new UnsupportedOperationException("Could not push down WHERE items to delete by query request: "
                    + whereItems);
        }
        final SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(queryBuilder);

        final DeleteByQuery deleteByQuery =
                new DeleteByQuery.Builder(searchSourceBuilder.toString()).addIndex(indexName).addType(
                        documentType).build();

        _updateCallback.execute(deleteByQuery);
    }
}