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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.trino.spi.block;

import java.util.OptionalInt;
import java.util.function.ObjLongConsumer;

import static io.airlift.slice.SizeOf.instanceSize;
import static io.trino.spi.block.BlockUtil.ensureBlocksAreLoaded;
import static java.lang.String.format;

public class SingleRowBlock
        extends AbstractSingleRowBlock
{
    private static final int INSTANCE_SIZE = instanceSize(SingleRowBlock.class);

    private final Block[] fieldBlocks;
    private final int rowIndex;

    SingleRowBlock(int rowIndex, Block[] fieldBlocks)
    {
        this.rowIndex = rowIndex;
        this.fieldBlocks = fieldBlocks;
    }

    int getNumFields()
    {
        return fieldBlocks.length;
    }

    @Override
    Block[] getRawFieldBlocks()
    {
        return fieldBlocks;
    }

    @Override
    protected Block getRawFieldBlock(int fieldIndex)
    {
        return fieldBlocks[fieldIndex];
    }

    @Override
    public int getPositionCount()
    {
        return fieldBlocks.length;
    }

    @Override
    public OptionalInt fixedSizeInBytesPerPosition()
    {
        return OptionalInt.empty();
    }

    @Override
    public long getSizeInBytes()
    {
        long sizeInBytes = 0;
        for (int i = 0; i < fieldBlocks.length; i++) {
            sizeInBytes += getRawFieldBlock(i).getRegionSizeInBytes(getRowIndex(), 1);
        }
        return sizeInBytes;
    }

    @Override
    public long getRetainedSizeInBytes()
    {
        long retainedSizeInBytes = INSTANCE_SIZE;
        for (int i = 0; i < fieldBlocks.length; i++) {
            retainedSizeInBytes += getRawFieldBlock(i).getRetainedSizeInBytes();
        }
        return retainedSizeInBytes;
    }

    @Override
    public void retainedBytesForEachPart(ObjLongConsumer