//liquid.bsh
//allows this Item to be a liquid or a liquid-container

//liquids have the property liquid (bool) and the volume is very important on'em.
//liquid-containers have the property liquid_container.
//also the relationship its_liquid with its liquid.

//acciones soportadas:

//vaciar liquid_container (en suelo) -> IMPLEMENTED
//vaciar liquid_container en liquid_container -> IMPLEMENTED
//llenar liquid_container con/de liquid (en suelo) -> IMPLEMENTED
//llenar liquid_container con liquid_container
//beber de liquid_container

//coger liquid (en suelo) con liquid_container -> llenar liquid_container con/de liquid (en suelo) -> IMPLEMENTED
//dejar liquid (en suelo) -> vaciar liquid_container (en suelo)


//global methods


//spill liquid from a liquid-container into the Void.
void before_spill_liquid ( Entity cont1 )
{
	List l1 = cont1.getRelatedEntitiesByValue("its_liquid",true);
	
	Item liquidOnFirst = null;
	
	if ( l1 != null && l1.size() > 0 )
		liquidOnFirst = (Item) l1.get(0);
		
	if ( liquidOnFirst == null ) return 0; //no liquid to transfer
	
	cont1.getContents().removeItem(liquidOnFirst);
	cont1.setRelationshipProperty(liquidOnFirst,"its_liquid",false);
	
	
}

//transfer liquid from a liquid-container to another. We talk about Entities because it1 and it2 can be Items or Rooms.
int before_transfer_liquid ( Entity cont1 , Entity cont2 )
{	

	System.out.println("############Liquid before transfer exec from " + cont1 + " to " + cont2);

	//{it1, it2 are liquid-containers}
	
	List l1 = cont1.getRelatedEntitiesByValue("its_liquid",true);
	List l2 = cont2.getRelatedEntitiesByValue("its_liquid",true);
	
	System.out.println("List one is " + l1);
	
	Item liquidOnFirst = null;
	Item liquidOnSecond = null;
	
	if ( l1 != null && l1.size() > 0 )
		liquidOnFirst = (Item) l1.get(0);
	
	if ( l2 != null && l2.size() > 0 )
		liquidOnSecond = (Item) l2.get(0);
	
	System.out.println("##Step 1.\n");
	
	if ( liquidOnFirst == null ) return 0; //no liquid to transfer
	
	Inventory targetInv = cont2.getContents();
	System.out.println("##Step 1.5.\n");
	int remaining_volume_on_second = targetInv.getVolumeLimit()- ( liquidOnSecond==null ? 0 : liquidOnSecond.getVolume() );
	
	System.out.println("##Step 2. Available volume on second: " + remaining_volume_on_second + "\n");
	
	if ( remaining_volume_on_second <= 0 ) return 0; //no room on second container to transfer anything (it's full!)
	
	int quantity_to_transfer = remaining_volume_on_second;
	
	if ( liquidOnFirst.getVolume() < quantity_to_transfer ) quantity_to_transfer = liquidOnFirst.getVolume();
	
	System.out.println("To transfer " + liquidOnFirst + " from " + cont1 + " to " +  cont2 + ": " + quantity_to_transfer);
	
	if ( quantity_to_transfer <= 0 ) return 0; //no liquid to pass to second container, first is empty.
	
	//do transfer:
	
	System.out.println("##Step 3. Initting liquid transfer.\n");
	
	if ( liquidOnSecond == null )
	{
		liquidOnFirst.setVolume ( liquidOnFirst.getVolume() - quantity_to_transfer );
		if ( liquidOnFirst.getVolume() <= 0 )
		{
			cont1.getContents().removeItem(liquidOnFirst);
			cont1.setRelationshipProperty(liquidOnFirst,"its_liquid",false);
		}
		Item mix = mix_liquids ( liquidOnFirst , quantity_to_transfer , liquidOnSecond , 0 );
		cont2.getContents().addItem ( mix );
		cont2.setRelationshipProperty ( mix , "its_liquid" , true );
	}
	else if ( liquidOnFirst.isSame ( liquidOnSecond ) )
	{
		liquidOnFirst.setVolume ( liquidOnFirst.getVolume() - quantity_to_transfer );
		if ( liquidOnFirst.getVolume() <= 0 )
		{
			cont1.getContents().removeItem(liquidOnFirst);
			cont1.setRelationshipProperty(liquidOnFirst,"its_liquid",false);
		}
		liquidOnSecond.setVolume ( liquidOnSecond.getVolume() + quantity_to_transfer );
	}
	
	else
	{
		liquidOnFirst.setVolume ( liquidOnFirst.getVolume() - quantity_to_transfer );
		if ( liquidOnFirst.getVolume() <= 0 )
		{
			cont1.getContents().removeItem(liquidOnFirst);
			cont1.setRelationshipProperty(liquidOnFirst,"its_liquid",false);
		}
		int tempVolume = liquidOnSecond.getVolume();
		cont2.getContents().removeItem ( liquidOnSecond );
		Item mix = mix_liquids ( liquidOnFirst , quantity_to_transfer , liquidOnSecond , tempVolume );
		cont2.getContents().addItem ( mix );
		cont2.setRelationshipProperty ( mix , "its_liquid" , true );
	}

	//current.getPropertyValueAsBoolean ("liquid");

	System.out.println("##Step 4. Done. Transferred " + quantity_to_transfer + " centilitres.\n");

	return quantity_to_transfer;

}

Item mix_liquids ( Item liquid1 , int volume1 , Item liquid2 , int volume2 ) //devuelve la mezcla. De momento, que sea el líquido 1.
{
	Item newLiquid = liquid1.createNewInstance(world,false,false);
	newLiquid.setVolume ( volume1 + (liquid2==null?0:volume2 ) );
	System.out.println("Volume set to " + newLiquid.getVolume());
	return ( newLiquid );
}




if ( self instanceof World )
	source("lib/liquid_world.bsh");


if ( self instanceof Item )
	source("lib/liquid_item.bsh");