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/*
 * #%L
 * anwiba commons core
 * %%
 * Copyright (C) 2007 - 2016 Andreas Bartels
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

package net.anwiba.commons.lang.stream;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.IntFunction;

import net.anwiba.commons.lang.collection.IObjectList;
import net.anwiba.commons.lang.collection.ObjectList;
import net.anwiba.commons.lang.functional.IAcceptor;
import net.anwiba.commons.lang.functional.IAggregator;
import net.anwiba.commons.lang.functional.IConsumer;
import net.anwiba.commons.lang.functional.IConverter;
import net.anwiba.commons.lang.functional.IFactory;
import net.anwiba.commons.lang.functional.IIterable;
import net.anwiba.commons.lang.optional.IOptional;
import net.anwiba.commons.lang.optional.Optional;

class SequencedStream implements IStream {

  private final IIterable iterable;

  SequencedStream(final IIterable iterable) {
    this.iterable = iterable;
  }

  @Override
  public  IStream convert(final IConverter converter) {
    return new SequencedStream<>(new ConvertingIterableIterable<>(this.iterable, i -> i != null, converter));
  }

  @Override
  public IStream distinct() {
    final Set set = new HashSet<>();
    return filter(i -> !set.add(i));
  }

  @Override
  public IStream call(final IConsumer consumer) throws E {
    this.foreach(consumer);
    return this;
  }

  @Override
  public IStream filter(final IAcceptor acceptor) {
    return new SequencedStream<>(new FilteringIterableIterable<>(this.iterable, acceptor));
  }

  @Override
  public void foreach(final IConsumer consumer) throws E {
    this.iterable.foreach(consumer);
  }

  @Override
  public IOptional first() throws E {
    return Optional.create(this.iterable.first(v -> true));
  }

  @Override
  public IOptional first(final IAcceptor acceptor) throws E {
    return Optional.create(this.iterable.first(acceptor));
  }

  @Override
  public Iterable asIterable() throws E {
    return this.iterable.aggregate(new LinkedList(), (l, t) -> {
      l.add(t);
      return l;
    });
  }

  @Override
  public Collection asCollection() throws E {
    return asList();
  }

  @SuppressWarnings("unchecked")
  @Override
  public  List asList() throws E {
    return this.iterable.aggregate(new ArrayList(), (l, t) -> {
      l.add((O) t);
      return l;
    });
  }

  @Override
  public IObjectList asObjectList() throws E {
    return new ObjectList<>(asList());
  }

  @Override
  public  IOptional aggregate(final O identity, final IAggregator aggegator) throws E {
    return Optional.create(this.iterable.aggregate(identity, aggegator));
  }

  @Override
  public  O[] asArray(final IntFunction factory) throws E {
    return asList().toArray(factory.apply(asList().size()));
  }

  @Override
  public  Map asMap(final IFactory keyFactrory, final IFactory valueFactrory) throws E {
    return this.iterable.aggregate(new LinkedHashMap(), (l, t) -> {
      l.put(keyFactrory.create(t), valueFactrory.create(t));
      return l;
    });
  }
}