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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.operator.aggregation;

import com.google.common.collect.ImmutableList;

import java.lang.reflect.Constructor;
import java.util.List;
import java.util.function.Supplier;

import static java.util.Objects.requireNonNull;

public class CompiledAccumulatorFactory
        implements AccumulatorFactory
{
    private final Constructor accumulatorConstructor;
    private final Constructor groupedAccumulatorConstructor;
    private final List> lambdaInterfaces;
    private final Constructor maskBuilderConstructor;

    public CompiledAccumulatorFactory(
            Constructor accumulatorConstructor,
            Constructor groupedAccumulatorConstructor,
            List> lambdaInterfaces,
            Constructor maskBuilderConstructor)
    {
        this.accumulatorConstructor = requireNonNull(accumulatorConstructor, "accumulatorConstructor is null");
        this.groupedAccumulatorConstructor = requireNonNull(groupedAccumulatorConstructor, "groupedAccumulatorConstructor is null");
        this.lambdaInterfaces = ImmutableList.copyOf(requireNonNull(lambdaInterfaces, "lambdaInterfaces is null"));
        this.maskBuilderConstructor = requireNonNull(maskBuilderConstructor, "maskBuilderConstructor is null");
    }

    @Override
    public List> getLambdaInterfaces()
    {
        return lambdaInterfaces;
    }

    @Override
    public Accumulator createAccumulator(List> lambdaProviders)
    {
        try {
            return accumulatorConstructor.newInstance(lambdaProviders);
        }
        catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public Accumulator createIntermediateAccumulator(List> lambdaProviders)
    {
        try {
            return accumulatorConstructor.newInstance(lambdaProviders);
        }
        catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public GroupedAccumulator createGroupedAccumulator(List> lambdaProviders)
    {
        try {
            return groupedAccumulatorConstructor.newInstance(lambdaProviders);
        }
        catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public GroupedAccumulator createGroupedIntermediateAccumulator(List> lambdaProviders)
    {
        try {
            return groupedAccumulatorConstructor.newInstance(lambdaProviders);
        }
        catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public AggregationMaskBuilder createAggregationMaskBuilder()
    {
        try {
            return maskBuilderConstructor.newInstance();
        }
        catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }
}