/*
 * 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.eagle.query.aggregate.raw;

import org.apache.eagle.log.entity.QualifierCreationListener;
import org.apache.eagle.log.entity.meta.EntityDefinition;
import org.apache.eagle.query.aggregate.AggregateFunctionType;

import java.util.List;
import java.util.ListIterator;
import java.util.Map;

public class RawAggregator implements QualifierCreationListener,GroupbyKeyAggregatable {
    private List<String> groupbyFields;
    private GroupbyKey key;
    private static final byte[] UNASSIGNED = "unassigned".getBytes();
    private RawGroupbyBucket bucket;

    public RawAggregator(List<String> groupbyFields, List<AggregateFunctionType> aggregateFunctionTypes, List<String> aggregatedFields, EntityDefinition ed) {
        this.groupbyFields = groupbyFields;
        key = new GroupbyKey();
        bucket = new RawGroupbyBucket(aggregateFunctionTypes, aggregatedFields, ed);
    }

    @Override
    public void qualifierCreated(Map<String, byte[]> qualifiers) {
        key.clear();
        ListIterator<String> it = groupbyFields.listIterator();
        while (it.hasNext()) {
            byte[] groupbyFieldValue = qualifiers.get(it.next());
            if (groupbyFieldValue == null) {
                key.addValue(UNASSIGNED);
            } else {
                key.addValue(groupbyFieldValue);
            }
        }
        GroupbyKey newKey = null;
        if (bucket.exists(key)) {
            newKey = key;
        } else {
            newKey = new GroupbyKey(key);
        }

        bucket.addDatapoint(newKey, qualifiers);
    }

    /**
     * @return
     */
    public Map<List<String>, List<Double>> result() {
        return bucket.result();
    }

    public List<GroupbyKeyValue> getGroupbyKeyValues() {
        return bucket.groupbyKeyValues();
    }
}