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/*
 * Licensed 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 io.prestosql.plugin.hive.coercions;

import io.airlift.slice.Slice;
import io.prestosql.spi.block.Block;
import io.prestosql.spi.block.BlockBuilder;
import io.prestosql.spi.type.DecimalType;
import io.prestosql.spi.type.DoubleType;
import io.prestosql.spi.type.RealType;

import java.util.function.Function;

import static io.prestosql.spi.type.DecimalConversions.doubleToLongDecimal;
import static io.prestosql.spi.type.DecimalConversions.doubleToShortDecimal;
import static io.prestosql.spi.type.DecimalConversions.longDecimalToDouble;
import static io.prestosql.spi.type.DecimalConversions.longDecimalToReal;
import static io.prestosql.spi.type.DecimalConversions.longToLongCast;
import static io.prestosql.spi.type.DecimalConversions.longToShortCast;
import static io.prestosql.spi.type.DecimalConversions.realToLongDecimal;
import static io.prestosql.spi.type.DecimalConversions.realToShortDecimal;
import static io.prestosql.spi.type.DecimalConversions.shortDecimalToDouble;
import static io.prestosql.spi.type.DecimalConversions.shortDecimalToReal;
import static io.prestosql.spi.type.DecimalConversions.shortToLongCast;
import static io.prestosql.spi.type.DecimalConversions.shortToShortCast;
import static io.prestosql.spi.type.Decimals.longTenToNth;
import static io.prestosql.spi.type.DoubleType.DOUBLE;
import static io.prestosql.spi.type.RealType.REAL;

public final class DecimalCoercers
{
    private DecimalCoercers() {}

    public static Function createDecimalToDecimalCoercer(DecimalType fromType, DecimalType toType)
    {
        if (fromType.isShort()) {
            if (toType.isShort()) {
                return new ShortDecimalToShortDecimalCoercer(fromType, toType);
            }
            else {
                return new ShortDecimalToLongDecimalCoercer(fromType, toType);
            }
        }
        else {
            if (toType.isShort()) {
                return new LongDecimalToShortDecimalCoercer(fromType, toType);
            }
            else {
                return new LongDecimalToLongDecimalCoercer(fromType, toType);
            }
        }
    }

    private static class ShortDecimalToShortDecimalCoercer
            extends TypeCoercer
    {
        private final long rescale;

        public ShortDecimalToShortDecimalCoercer(DecimalType fromType, DecimalType toType)
        {
            super(fromType, toType);
            rescale = longTenToNth(Math.abs(toType.getScale() - fromType.getScale()));
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            long returnValue = shortToShortCast(fromType.getLong(block, position),
                    fromType.getPrecision(),
                    fromType.getScale(),
                    toType.getPrecision(),
                    toType.getScale(),
                    rescale,
                    rescale / 2);
            toType.writeLong(blockBuilder, returnValue);
        }
    }

    private static class ShortDecimalToLongDecimalCoercer
            extends TypeCoercer
    {
        public ShortDecimalToLongDecimalCoercer(DecimalType fromType, DecimalType toType)
        {
            super(fromType, toType);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            Slice coercedValue = shortToLongCast(fromType.getLong(block, position),
                    fromType.getPrecision(),
                    fromType.getScale(),
                    toType.getPrecision(),
                    toType.getScale());
            toType.writeSlice(blockBuilder, coercedValue);
        }
    }

    private static class LongDecimalToShortDecimalCoercer
            extends TypeCoercer
    {
        public LongDecimalToShortDecimalCoercer(DecimalType fromType, DecimalType toType)
        {
            super(fromType, toType);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            long returnValue = longToShortCast(fromType.getSlice(block, position),
                    fromType.getPrecision(),
                    fromType.getScale(),
                    toType.getPrecision(),
                    toType.getScale());
            toType.writeLong(blockBuilder, returnValue);
        }
    }

    private static class LongDecimalToLongDecimalCoercer
            extends TypeCoercer
    {
        public LongDecimalToLongDecimalCoercer(DecimalType fromType, DecimalType toType)
        {
            super(fromType, toType);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            Slice coercedValue = longToLongCast(fromType.getSlice(block, position),
                    fromType.getPrecision(),
                    fromType.getScale(),
                    toType.getPrecision(),
                    toType.getScale());
            toType.writeSlice(blockBuilder, coercedValue);
        }
    }

    public static Function createDecimalToDoubleCoercer(DecimalType fromType)
    {
        if (fromType.isShort()) {
            return new ShortDecimalToDoubleCoercer(fromType);
        }
        else {
            return new LongDecimalToDoubleCoercer(fromType);
        }
    }

    private static class ShortDecimalToDoubleCoercer
            extends TypeCoercer
    {
        private final long rescale;

        public ShortDecimalToDoubleCoercer(DecimalType fromType)
        {
            super(fromType, DOUBLE);
            rescale = longTenToNth(fromType.getScale());
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeDouble(blockBuilder,
                    shortDecimalToDouble(fromType.getLong(block, position), rescale));
        }
    }

    private static class LongDecimalToDoubleCoercer
            extends TypeCoercer
    {
        public LongDecimalToDoubleCoercer(DecimalType fromType)
        {
            super(fromType, DOUBLE);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeDouble(blockBuilder,
                    longDecimalToDouble(fromType.getSlice(block, position), fromType.getScale()));
        }
    }

    public static Function createDecimalToRealCoercer(DecimalType fromType)
    {
        if (fromType.isShort()) {
            return new ShortDecimalToRealCoercer(fromType);
        }
        else {
            return new LongDecimalToRealCoercer(fromType);
        }
    }

    private static class ShortDecimalToRealCoercer
            extends TypeCoercer
    {
        private final long rescale;

        public ShortDecimalToRealCoercer(DecimalType fromType)
        {
            super(fromType, REAL);
            rescale = longTenToNth(fromType.getScale());
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeLong(blockBuilder,
                    shortDecimalToReal(fromType.getLong(block, position), rescale));
        }
    }

    private static class LongDecimalToRealCoercer
            extends TypeCoercer
    {
        public LongDecimalToRealCoercer(DecimalType fromType)
        {
            super(fromType, REAL);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeLong(blockBuilder,
                    longDecimalToReal(fromType.getSlice(block, position), fromType.getScale()));
        }
    }

    public static Function createDoubleToDecimalCoercer(DecimalType toType)
    {
        if (toType.isShort()) {
            return new DoubleToShortDecimalCoercer(toType);
        }
        else {
            return new DoubleToLongDecimalCoercer(toType);
        }
    }

    private static class DoubleToShortDecimalCoercer
            extends TypeCoercer
    {
        public DoubleToShortDecimalCoercer(DecimalType toType)
        {
            super(DOUBLE, toType);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeLong(blockBuilder,
                    doubleToShortDecimal(fromType.getDouble(block, position), toType.getPrecision(), toType.getScale()));
        }
    }

    private static class DoubleToLongDecimalCoercer
            extends TypeCoercer
    {
        public DoubleToLongDecimalCoercer(DecimalType toType)
        {
            super(DOUBLE, toType);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeSlice(blockBuilder,
                    doubleToLongDecimal(fromType.getDouble(block, position), toType.getPrecision(), toType.getScale()));
        }
    }

    public static Function createRealToDecimalCoercer(DecimalType toType)
    {
        if (toType.isShort()) {
            return new RealToShortDecimalCoercer(toType);
        }
        else {
            return new RealToLongDecimalCoercer(toType);
        }
    }

    private static class RealToShortDecimalCoercer
            extends TypeCoercer
    {
        public RealToShortDecimalCoercer(DecimalType toType)
        {
            super(REAL, toType);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeLong(blockBuilder,
                    realToShortDecimal(fromType.getLong(block, position), toType.getPrecision(), toType.getScale()));
        }
    }

    private static class RealToLongDecimalCoercer
            extends TypeCoercer
    {
        public RealToLongDecimalCoercer(DecimalType toType)
        {
            super(REAL, toType);
        }

        @Override
        protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
        {
            toType.writeSlice(blockBuilder,
                    realToLongDecimal(fromType.getLong(block, position), toType.getPrecision(), toType.getScale()));
        }
    }
}