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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.phoenix.expression.function;

import java.util.List;

import org.apache.phoenix.expression.Expression;
import org.apache.phoenix.util.DateUtil;
import org.joda.time.DateTime;
import org.joda.time.DateTimeFieldType;
import org.joda.time.chrono.GJChronology;

/**
 * 
 * Rounds off the given {@link DateTime} to month.
 */
public class RoundMonthExpression extends RoundJodaDateExpression {
    
    public RoundMonthExpression(){}
    
    public RoundMonthExpression(List children) {
       super(children);
    }

    @Override
    public long roundDateTime(DateTime dateTime) {
       return dateTime.monthOfYear().roundHalfEvenCopy().getMillis();
    }

    @Override
    public long rangeLower(long epochMs) {
        // We're doing unnecessary conversions here, but this is not perf sensitive
        DateTime rounded =
                new DateTime(roundDateTime(new DateTime(epochMs, GJChronology.getInstanceUTC())),
                        GJChronology.getInstanceUTC());
        DateTime prev = rounded.minusMonths(1);
        return DateUtil.rangeJodaHalfEven(rounded, prev, DateTimeFieldType.monthOfYear());
    }

    @Override
    public long rangeUpper(long epochMs) {
        DateTime rounded =
                new DateTime(roundDateTime(new DateTime(epochMs, GJChronology.getInstanceUTC())),
                        GJChronology.getInstanceUTC());
        DateTime next = rounded.plusMonths(1);
        return DateUtil.rangeJodaHalfEven(rounded, next, DateTimeFieldType.monthOfYear());
    }
}