/*
 * 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.asterix.runtime.evaluators.functions.temporal;

import java.io.DataOutput;

import org.apache.asterix.dataflow.data.nontagged.serde.ADateSerializerDeserializer;
import org.apache.asterix.dataflow.data.nontagged.serde.ADateTimeSerializerDeserializer;
import org.apache.asterix.dataflow.data.nontagged.serde.ADayTimeDurationSerializerDeserializer;
import org.apache.asterix.dataflow.data.nontagged.serde.ATimeSerializerDeserializer;
import org.apache.asterix.dataflow.data.nontagged.serde.AYearMonthDurationSerializerDeserializer;
import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
import org.apache.asterix.om.base.AInterval;
import org.apache.asterix.om.base.AMutableInterval;
import org.apache.asterix.om.base.temporal.DurationArithmeticOperations;
import org.apache.asterix.om.base.temporal.GregorianCalendarSystem;
import org.apache.asterix.om.functions.BuiltinFunctions;
import org.apache.asterix.om.functions.IFunctionDescriptor;
import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
import org.apache.asterix.om.types.ATypeTag;
import org.apache.asterix.om.types.BuiltinType;
import org.apache.asterix.om.types.EnumDeserializer;
import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
import org.apache.asterix.runtime.exceptions.IncompatibleTypeException;
import org.apache.asterix.runtime.exceptions.InvalidDataFormatException;
import org.apache.asterix.runtime.exceptions.OverflowException;
import org.apache.asterix.runtime.exceptions.TypeMismatchException;
import org.apache.asterix.runtime.exceptions.UnderflowException;
import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
import org.apache.hyracks.api.context.IHyracksTaskContext;
import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
import org.apache.hyracks.api.exceptions.HyracksDataException;
import org.apache.hyracks.data.std.api.IPointable;
import org.apache.hyracks.data.std.primitive.VoidPointable;
import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;

public class IntervalBinDescriptor extends AbstractScalarFunctionDynamicDescriptor {

    private static final long serialVersionUID = 1L;
    public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() {

        @Override
        public IFunctionDescriptor createFunctionDescriptor() {
            return new IntervalBinDescriptor();
        }
    };

    @Override
    public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
        return new IScalarEvaluatorFactory() {

            private static final long serialVersionUID = 1L;

            @Override
            public IScalarEvaluator createScalarEvaluator(final IHyracksTaskContext ctx) throws HyracksDataException {
                return new IScalarEvaluator() {

                    private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                    private final DataOutput out = resultStorage.getDataOutput();

                    private final IPointable argPtr0 = new VoidPointable();
                    private final IPointable argPtr1 = new VoidPointable();
                    private final IPointable argPtr2 = new VoidPointable();

                    private final IScalarEvaluator eval0 = args[0].createScalarEvaluator(ctx);
                    private final IScalarEvaluator eval1 = args[1].createScalarEvaluator(ctx);
                    private final IScalarEvaluator eval2 = args[2].createScalarEvaluator(ctx);

                    private final AMutableInterval aInterval = new AMutableInterval(0, 0, (byte) -1);

                    @SuppressWarnings("unchecked")
                    private final ISerializerDeserializer<AInterval> intervalSerde =
                            SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.AINTERVAL);

                    private final GregorianCalendarSystem GREG_CAL = GregorianCalendarSystem.getInstance();

                    @Override
                    public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                        resultStorage.reset();
                        eval0.evaluate(tuple, argPtr0);
                        eval1.evaluate(tuple, argPtr1);
                        eval2.evaluate(tuple, argPtr2);

                        byte[] bytes0 = argPtr0.getByteArray();
                        int offset0 = argPtr0.getStartOffset();
                        ATypeTag type0 = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes0[offset0]);

                        long chrononToBin = 0;
                        switch (type0) {
                            case DATE:
                                chrononToBin = ADateSerializerDeserializer.getChronon(bytes0, offset0 + 1)
                                        * GregorianCalendarSystem.CHRONON_OF_DAY;
                                break;
                            case TIME:
                                chrononToBin = ATimeSerializerDeserializer.getChronon(bytes0, offset0 + 1);
                                break;
                            case DATETIME:
                                chrononToBin = ADateTimeSerializerDeserializer.getChronon(bytes0, offset0 + 1);
                                break;
                            default:
                                throw new TypeMismatchException(getIdentifier(), 0, bytes0[offset0],
                                        ATypeTag.SERIALIZED_DATE_TYPE_TAG, ATypeTag.SERIALIZED_TIME_TYPE_TAG,
                                        ATypeTag.SERIALIZED_DATETIME_TYPE_TAG);
                        }

                        byte[] bytes1 = argPtr1.getByteArray();
                        int offset1 = argPtr1.getStartOffset();
                        ATypeTag type1 = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes1[offset1]);

                        if (type0 != type1) {
                            throw new IncompatibleTypeException(getIdentifier(), bytes0[offset0], bytes1[offset1]);
                        }

                        long chrononToStart = 0;
                        switch (type1) {
                            case DATE:
                                chrononToStart = ADateSerializerDeserializer.getChronon(bytes1, offset1 + 1)
                                        * GregorianCalendarSystem.CHRONON_OF_DAY;
                                break;
                            case TIME:
                                chrononToStart = ATimeSerializerDeserializer.getChronon(bytes1, offset1 + 1);
                                break;
                            case DATETIME:
                                chrononToStart = ADateTimeSerializerDeserializer.getChronon(bytes1, offset1 + 1);
                                break;
                            default:
                                throw new TypeMismatchException(getIdentifier(), 1, bytes1[offset1],
                                        ATypeTag.SERIALIZED_DATE_TYPE_TAG, ATypeTag.SERIALIZED_TIME_TYPE_TAG,
                                        ATypeTag.SERIALIZED_DATETIME_TYPE_TAG);
                        }

                        byte[] bytes2 = argPtr2.getByteArray();
                        int offset2 = argPtr2.getStartOffset();
                        ATypeTag type2 = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes2[offset2]);

                        int yearMonth = 0;
                        long dayTime = 0;
                        long binIndex, binStartChronon, binEndChronon;
                        switch (type2) {
                            case YEARMONTHDURATION:
                                yearMonth = AYearMonthDurationSerializerDeserializer.getYearMonth(bytes2, offset2 + 1);
                                int yearStart = GREG_CAL.getYear(chrononToStart);
                                int monthStart = GREG_CAL.getMonthOfYear(chrononToStart, yearStart);
                                int yearToBin = GREG_CAL.getYear(chrononToBin);
                                int monthToBin = GREG_CAL.getMonthOfYear(chrononToBin, yearToBin);

                                int totalMonths = (yearToBin - yearStart) * 12 + (monthToBin - monthStart);

                                binIndex = totalMonths / yearMonth
                                        + ((totalMonths < 0 && totalMonths % yearMonth != 0) ? -1 : 0);

                                if (binIndex > Integer.MAX_VALUE) {
                                    throw new OverflowException(getIdentifier());
                                }

                                if (binIndex < Integer.MIN_VALUE) {
                                    throw new UnderflowException(getIdentifier());
                                }

                                break;

                            case DAYTIMEDURATION:
                                dayTime = ADayTimeDurationSerializerDeserializer.getDayTime(bytes2, offset2 + 1);
                                long totalChronon = chrononToBin - chrononToStart;

                                binIndex = totalChronon / dayTime
                                        + ((totalChronon < 0 && totalChronon % dayTime != 0) ? -1 : 0);
                                break;
                            default:
                                throw new TypeMismatchException(getIdentifier().getName(), 2, bytes2[offset2],
                                        ATypeTag.SERIALIZED_YEAR_MONTH_DURATION_TYPE_TAG,
                                        ATypeTag.SERIALIZED_DAY_TIME_DURATION_TYPE_TAG);
                        }

                        switch (type0) {
                            case DATE:
                                binStartChronon = DurationArithmeticOperations.addDuration(chrononToStart,
                                        yearMonth * (int) binIndex, dayTime * binIndex, false);
                                binEndChronon = DurationArithmeticOperations.addDuration(chrononToStart,
                                        yearMonth * ((int) binIndex + 1), dayTime * (binIndex + 1), false);

                                binStartChronon = binStartChronon / GregorianCalendarSystem.CHRONON_OF_DAY
                                        + ((binStartChronon < 0
                                                && binStartChronon % GregorianCalendarSystem.CHRONON_OF_DAY != 0) ? -1
                                                        : 0);
                                binEndChronon = binEndChronon / GregorianCalendarSystem.CHRONON_OF_DAY
                                        + ((binEndChronon < 0
                                                && binEndChronon % GregorianCalendarSystem.CHRONON_OF_DAY != 0) ? -1
                                                        : 0);
                                break;
                            case TIME:
                                if (yearMonth != 0) {
                                    throw new InvalidDataFormatException(getIdentifier(),
                                            ATypeTag.SERIALIZED_INTERVAL_TYPE_TAG);
                                }
                                binStartChronon = DurationArithmeticOperations.addDuration(chrononToStart,
                                        yearMonth * (int) binIndex, dayTime * binIndex, true);
                                binEndChronon = DurationArithmeticOperations.addDuration(chrononToStart,
                                        yearMonth * ((int) binIndex + 1), dayTime * (binIndex + 1), true);
                                break;
                            case DATETIME:
                                binStartChronon = DurationArithmeticOperations.addDuration(chrononToStart,
                                        yearMonth * (int) binIndex, dayTime * binIndex, false);
                                binEndChronon = DurationArithmeticOperations.addDuration(chrononToStart,
                                        yearMonth * ((int) binIndex + 1), dayTime * (binIndex + 1), false);
                                break;
                            default:
                                throw new TypeMismatchException(getIdentifier(), 0, bytes0[offset0],
                                        ATypeTag.SERIALIZED_DATE_TYPE_TAG, ATypeTag.SERIALIZED_TIME_TYPE_TAG,
                                        ATypeTag.SERIALIZED_DATETIME_TYPE_TAG);
                        }
                        aInterval.setValue(binStartChronon, binEndChronon, type0.serialize());
                        intervalSerde.serialize(aInterval, out);
                        result.set(resultStorage);
                    }
                };
            }

        };
    }

    /* (non-Javadoc)
     * @see org.apache.asterix.om.functions.AbstractFunctionDescriptor#getIdentifier()
     */
    @Override
    public FunctionIdentifier getIdentifier() {
        return BuiltinFunctions.INTERVAL_BIN;
    }

}
