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/*
 * Copyright (c) 2016 Goldman Sachs.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompany this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */

package org.eclipse.collections.impl.lazy.parallel;

import java.util.Comparator;

import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.function.primitive.DoubleFunction;
import org.eclipse.collections.api.block.function.primitive.FloatFunction;
import org.eclipse.collections.api.block.function.primitive.IntFunction;
import org.eclipse.collections.api.block.function.primitive.LongFunction;
import org.eclipse.collections.api.block.predicate.Predicate;
import org.eclipse.collections.impl.block.procedure.CountProcedure;
import org.eclipse.collections.impl.block.procedure.DoubleSumResultHolder;
import org.eclipse.collections.impl.block.procedure.MaxByProcedure;
import org.eclipse.collections.impl.block.procedure.MaxComparatorProcedure;
import org.eclipse.collections.impl.block.procedure.MinByProcedure;
import org.eclipse.collections.impl.block.procedure.MinComparatorProcedure;
import org.eclipse.collections.impl.block.procedure.SumOfDoubleProcedure;
import org.eclipse.collections.impl.block.procedure.SumOfFloatProcedure;
import org.eclipse.collections.impl.block.procedure.SumOfIntProcedure;
import org.eclipse.collections.impl.block.procedure.SumOfLongProcedure;

public abstract class AbstractBatch implements Batch
{
    @Override
    public int count(Predicate predicate)
    {
        CountProcedure procedure = new CountProcedure<>(predicate);
        this.forEach(procedure);
        return procedure.getCount();
    }

    @Override
    public String makeString(String separator)
    {
        StringBuilder stringBuilder = new StringBuilder();
        this.forEach(each -> {
            if (stringBuilder.length() != 0)
            {
                stringBuilder.append(separator);
            }
            stringBuilder.append(each);
        });
        return stringBuilder.toString();
    }

    @Override
    public T min(Comparator comparator)
    {
        MinComparatorProcedure procedure = new MinComparatorProcedure<>(comparator);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    @Override
    public T max(Comparator comparator)
    {
        MaxComparatorProcedure procedure = new MaxComparatorProcedure<>(comparator);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    @Override
    public > T minBy(Function function)
    {
        MinByProcedure procedure = new MinByProcedure<>(function);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    @Override
    public > T maxBy(Function function)
    {
        MaxByProcedure procedure = new MaxByProcedure<>(function);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    @Override
    public long sumOfInt(IntFunction function)
    {
        SumOfIntProcedure procedure = new SumOfIntProcedure<>(function);
        this.forEach(procedure);
        return procedure.getResult();
    }

    @Override
    public DoubleSumResultHolder sumOfFloat(FloatFunction function)
    {
        SumOfFloatProcedure procedure = new SumOfFloatProcedure<>(function);
        this.forEach(procedure);
        return procedure;
    }

    @Override
    public long sumOfLong(LongFunction function)
    {
        SumOfLongProcedure procedure = new SumOfLongProcedure<>(function);
        this.forEach(procedure);
        return procedure.getResult();
    }

    @Override
    public DoubleSumResultHolder sumOfDouble(DoubleFunction function)
    {
        SumOfDoubleProcedure procedure = new SumOfDoubleProcedure<>(function);
        this.forEach(procedure);
        return procedure;
    }
}