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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.dinky.shaded.paimon.mergetree.compact.aggregate;

import org.dinky.shaded.paimon.data.Decimal;
import org.dinky.shaded.paimon.types.DataType;
import org.dinky.shaded.paimon.utils.DecimalUtils;

/** sum aggregate a field of a row. */
public class FieldSumAgg extends FieldAggregator {

    public static final String NAME = "sum";

    public FieldSumAgg(DataType dataType) {
        super(dataType);
    }

    @Override
    String name() {
        return NAME;
    }

    @Override
    public Object agg(Object accumulator, Object inputField) {
        Object sum;

        if (accumulator == null || inputField == null) {
            sum = (accumulator == null ? inputField : accumulator);
        } else {
            // ordered by type root definition
            switch (fieldType.getTypeRoot()) {
                case DECIMAL:
                    Decimal mergeFieldDD = (Decimal) accumulator;
                    Decimal inFieldDD = (Decimal) inputField;
                    assert mergeFieldDD.scale() == inFieldDD.scale()
                            : "Inconsistent scale of aggregate Decimal!";
                    assert mergeFieldDD.precision() == inFieldDD.precision()
                            : "Inconsistent precision of aggregate Decimal!";
                    sum =
                            DecimalUtils.add(
                                    mergeFieldDD,
                                    inFieldDD,
                                    mergeFieldDD.precision(),
                                    mergeFieldDD.scale());
                    break;
                case TINYINT:
                    sum = (byte) ((byte) accumulator + (byte) inputField);
                    break;
                case SMALLINT:
                    sum = (short) ((short) accumulator + (short) inputField);
                    break;
                case INTEGER:
                    sum = (int) accumulator + (int) inputField;
                    break;
                case BIGINT:
                    sum = (long) accumulator + (long) inputField;
                    break;
                case FLOAT:
                    sum = (float) accumulator + (float) inputField;
                    break;
                case DOUBLE:
                    sum = (double) accumulator + (double) inputField;
                    break;
                default:
                    throw new IllegalArgumentException();
            }
        }
        return sum;
    }

    @Override
    public Object retract(Object accumulator, Object inputField) {
        Object sum;

        if (accumulator == null || inputField == null) {
            sum = (accumulator == null ? negative(inputField) : accumulator);
        } else {
            switch (fieldType.getTypeRoot()) {
                case DECIMAL:
                    Decimal mergeFieldDD = (Decimal) accumulator;
                    Decimal inFieldDD = (Decimal) inputField;
                    assert mergeFieldDD.scale() == inFieldDD.scale()
                            : "Inconsistent scale of aggregate Decimal!";
                    assert mergeFieldDD.precision() == inFieldDD.precision()
                            : "Inconsistent precision of aggregate Decimal!";
                    sum =
                            DecimalUtils.subtract(
                                    mergeFieldDD,
                                    inFieldDD,
                                    mergeFieldDD.precision(),
                                    mergeFieldDD.scale());
                    break;
                case TINYINT:
                    sum = (byte) ((byte) accumulator - (byte) inputField);
                    break;
                case SMALLINT:
                    sum = (short) ((short) accumulator - (short) inputField);
                    break;
                case INTEGER:
                    sum = (int) accumulator - (int) inputField;
                    break;
                case BIGINT:
                    sum = (long) accumulator - (long) inputField;
                    break;
                case FLOAT:
                    sum = (float) accumulator - (float) inputField;
                    break;
                case DOUBLE:
                    sum = (double) accumulator - (double) inputField;
                    break;
                default:
                    throw new IllegalArgumentException();
            }
        }
        return sum;
    }

    private Object negative(Object value) {
        if (value == null) {
            return null;
        }
        switch (fieldType.getTypeRoot()) {
            case DECIMAL:
                Decimal decimal = (Decimal) value;
                return Decimal.fromBigDecimal(
                        decimal.toBigDecimal().negate(), decimal.precision(), decimal.scale());
            case TINYINT:
                return (byte) -((byte) value);
            case SMALLINT:
                return (short) -((short) value);
            case INTEGER:
                return -((int) value);
            case BIGINT:
                return -((long) value);
            case FLOAT:
                return -((float) value);
            case DOUBLE:
                return -((double) value);
            default:
                throw new IllegalArgumentException();
        }
    }
}