package com.planet_ink.coffee_mud.core.collections;
import java.util.*;

import com.planet_ink.coffee_mud.core.CMParms;

/*
   Copyright 2014-2020 Bo Zimmerman

   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.
*/
@SuppressWarnings("unchecked")
public class MultiCollection<T> implements Collection<T>
{
	private final Vector<Collection<? extends T>> collections = new Vector<Collection<? extends T>>();

	public MultiCollection(final Collection<T>... colls)
	{
		super();
		if(colls==null)
			return;
		collections.addAll(Arrays.asList(colls));
		collections.trimToSize();
	}

	@Override
	public boolean add(final T arg0)
	{
		if(collections.size()>0)
		{
			try
			{
				final Collection<T> coll=(Collection<T>)collections.get(collections.size()-1);
				return coll.add(arg0);
			}
			catch (final Exception e)
			{
			}
		}
		return false;
	}

	@Override
	public boolean addAll(final Collection<? extends T> arg0)
	{
		collections.add(arg0);
		collections.trimToSize();
		return true;
	}

	@Override
	public void clear()
	{
		collections.clear();
	}

	@Override
	public boolean contains(final Object arg0)
	{
		if(collections.size()>0)
		{
			try
			{
				for(int c=0;c<collections.size();c++)
				{
					if(collections.get(c).contains(arg0))
						return true;
				}
			}
			catch (final Exception e)
			{
			}
		}
		return false;
	}

	@Override
	public boolean containsAll(final Collection<?> arg0)
	{
		for(final Object arg : arg0)
		{
			if(!contains(arg))
				return false;
		}
		return true;
	}

	@Override
	public boolean isEmpty()
	{
		if(collections.size()>0)
		{
			try
			{
				for(int c=0;c<collections.size();c++)
				{
					if(collections.get(c).size()>0)
						return false;
				}
			}
			catch (final Exception e)
			{
			}
		}
		return true;
	}

	@Override
	public Iterator<T> iterator()
	{
		return new MultiIterable<T>(collections,size()).iterator();
	}

	@Override
	public boolean remove(final Object arg0)
	{
		if(collections.size()>0)
		{
			try
			{
				for(int c=0;c<collections.size();c++)
				{
					if(collections.get(c).remove(arg0))
						return true;
				}
			}
			catch (final Exception e)
			{
			}
		}
		return false;
	}

	@Override
	public boolean removeAll(final Collection<?> arg0)
	{
		if(collections.size()>0)
		{
			boolean returnable=false;
			try
			{
				for(int c=0;c<collections.size();c++)
					returnable = collections.get(c).removeAll(arg0) || returnable;
			}
			catch (final Exception e)
			{
			}
			return returnable;
		}
		return false;
	}

	@Override
	public boolean retainAll(final Collection<?> arg0)
	{
		if(collections.size()>0)
		{
			boolean returnable=false;
			try
			{
				for(int c=0;c<collections.size();c++)
					returnable = collections.get(c).retainAll(arg0) || returnable;
			}
			catch (final Exception e)
			{
			}
			return returnable;
		}
		return false;
	}

	@Override
	public int size()
	{
		int total=0;
		if(collections.size()>0)
		{
			try
			{
				for(int c=0;c<collections.size();c++)
					total += collections.get(c).size();
			}
			catch (final Exception e)
			{
			}
		}
		return total;
	}

	@Override
	public Object[] toArray()
	{
		final Object[][] arrays=new Object[collections.size()][];
		try
		{
			for(int c=0;c<collections.size();c++)
				arrays[c]=collections.get(c).toArray();
		}
		catch (final Exception e)
		{
		}
		return CMParms.combine(arrays);
	}

	@SuppressWarnings("hiding")

	@Override
	public <T> T[] toArray(T[] arg0)
	{
		final Object[] objs=toArray();
		if(arg0.length<objs.length)
			arg0=Arrays.copyOf(arg0, objs.length);
		int i=0;
		for(final Object o : objs)
			arg0[i++]=(T)o;
		return arg0;
	}

}
