/*
 * 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;

import java.util.Iterator;
import java.util.Optional;

import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.predicate.Predicate;
import org.eclipse.collections.api.block.predicate.Predicate2;
import org.eclipse.collections.api.block.procedure.Procedure;
import org.eclipse.collections.api.block.procedure.Procedure2;
import org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure;
import org.eclipse.collections.impl.block.factory.Predicates;
import org.eclipse.collections.impl.block.procedure.AdaptObjectIntProcedureToProcedure;
import org.eclipse.collections.impl.lazy.iterator.FlatCollectIterator;
import org.eclipse.collections.impl.utility.Iterate;

public class FlatCollectIterable<T, V>
        extends AbstractLazyIterable<V>
{
    private final Iterable<T> adapted;
    private final Function<? super T, ? extends Iterable<V>> function;

    public FlatCollectIterable(Iterable<T> newAdapted, Function<? super T, ? extends Iterable<V>> function)
    {
        this.adapted = newAdapted;
        this.function = function;
    }

    @Override
    public void each(Procedure<? super V> procedure)
    {
        Iterate.forEach(this.adapted, each -> Iterate.forEach(this.function.valueOf(each), procedure));
    }

    @Override
    public void forEachWithIndex(ObjectIntProcedure<? super V> objectIntProcedure)
    {
        Procedure<V> innerProcedure = new AdaptObjectIntProcedureToProcedure<>(objectIntProcedure);
        Iterate.forEach(this.adapted, each ->
        {
            Iterable<V> iterable = this.function.valueOf(each);
            Iterate.forEach(iterable, innerProcedure);
        });
    }

    @Override
    public <P> void forEachWith(Procedure2<? super V, ? super P> procedure, P parameter)
    {
        Iterate.forEach(this.adapted, each -> Iterate.forEachWith(this.function.valueOf(each), procedure, parameter));
    }

    @Override
    public V detect(Predicate<? super V> predicate)
    {
        V[] result = (V[]) new Object[1];
        Iterate.anySatisfy(this.adapted, each ->
        {
            Iterable<V> iterable = this.function.valueOf(each);
            return Iterate.anySatisfy(iterable, each1 ->
            {
                if (predicate.accept(each1))
                {
                    result[0] = each1;
                    return true;
                }
                return false;
            });
        });
        return result[0];
    }

    @Override
    public Optional<V> detectOptional(Predicate<? super V> predicate)
    {
        V[] result = (V[]) new Object[1];
        Iterate.anySatisfy(this.adapted, each ->
        {
            if (each == null)
            {
                throw new NullPointerException();
            }
            Iterable<V> iterable = this.function.valueOf(each);
            if (iterable == null)
            {
                throw new NullPointerException();
            }
            return Iterate.anySatisfy(iterable, each1 ->
            {
                if (predicate.accept(each1))
                {
                    if (each1 == null)
                    {
                        throw new NullPointerException();
                    }
                    result[0] = each1;
                    return true;
                }
                return false;
            });
        });
        return Optional.ofNullable(result[0]);
    }

    @Override
    public boolean anySatisfy(Predicate<? super V> predicate)
    {
        return Iterate.anySatisfy(this.adapted, each -> Iterate.anySatisfy(this.function.valueOf(each), predicate));
    }

    @Override
    public <P> boolean anySatisfyWith(Predicate2<? super V, ? super P> predicate, P parameter)
    {
        return this.anySatisfy(Predicates.bind(predicate, parameter));
    }

    @Override
    public boolean allSatisfy(Predicate<? super V> predicate)
    {
        return Iterate.allSatisfy(this.adapted, each -> Iterate.allSatisfy(this.function.valueOf(each), predicate));
    }

    @Override
    public <P> boolean allSatisfyWith(Predicate2<? super V, ? super P> predicate, P parameter)
    {
        return this.allSatisfy(Predicates.bind(predicate, parameter));
    }

    @Override
    public boolean noneSatisfy(Predicate<? super V> predicate)
    {
        return Iterate.noneSatisfy(this.adapted, each -> Iterate.anySatisfy(this.function.valueOf(each), predicate));
    }

    @Override
    public <P> boolean noneSatisfyWith(Predicate2<? super V, ? super P> predicate, P parameter)
    {
        return this.noneSatisfy(Predicates.bind(predicate, parameter));
    }

    @Override
    public Iterator<V> iterator()
    {
        return new FlatCollectIterator<>(this.adapted, this.function);
    }
}