package mug13;

import java.util.Vector;
/**
 * The world for Multi-User Grinnell.  Although it violates
 * some standards of object-oriented design, we use the world
 * as a central repository for all our objects.
 *
 * @author CSC152 2004F
 */
public class RealWorld
	implements World
{
//fields
	
	WorldBuilder worldOps;
	Broadcaster b;
	
//constructors
	public RealWorld(WorldBuilder _worldOps)
	{
		worldOps = _worldOps;
	}
//Methods
	/**
	 * Indicate that some time has passed.
	 *
	void elapse();
	*/

// Methods for "normal" UI to interact with.
	
	/**
	 * Determine what time it is in the world.
	 *
	public Time time();
	
	/**
	 * Get the location of someone in the world.
	 */
	public String getLocation(String name)
	{
		try
		{
			ThingPerson examined = worldOps.mapThingPerson(name);
			return examined.getWordAttribute("location");
		}
		catch(Exception e)
		{
			String returned = new String("Send a valid Noun");
			return returned;
		}
	}
	
	/**
	 * Get the descriptionInvalidVerb of something (a noun).
	 */
	public String describe(String name)
	{
		try
		{
			Noun examined = worldOps.mapNoun(name);
			return examined.describe();
		}
		catch(Exception e)
		{
			String returned = new String("Send a valid Noun");
			return returned;
		}
	}
	
	/**
	* Find all the people in a room
	*/
	public String[] listPeople(String room)
	{
		try
		{
			Place spot = worldOps.mapPlace(room);
			
			Vector persons = spot.persons();
			String[] stuff = new String[persons.size()];
			persons.copyInto(stuff);
			return stuff;
		}
		catch(Exception e)
		{
			String[] returned = {"Send a valid Location"};
			return returned;
		}
	}
	
	/**
	* find all the things in a room
	*/
	public String[] listContents(String room)
	{
		try
		{
			Place spot = worldOps.mapPlace(room);
			
			Vector things = spot.things();
			String[] stuff = new String[things.size()];
			things.copyInto(stuff);
			return stuff;
		}
		
		catch(Exception e)
		{
			String[] returned = {"Send a valid Location"};
			return returned;
		}
	}
	
	/**
	 * Record that an interaction has happened.  Return a comment on the
	 * results of the action.
	 *
	 * @exception
	 *   If the action is invalid or the object is invalid or ...
	 */
	public String perform(Action tim)
		throws InvalidVerbException, InvalidTargetException
	{
		String subject = tim.getSubject();
		String location = this.getLocation(subject);
		String object = tim.getObject();
		Verb verb = null;
		
		try
		{
			verb = worldOps.mapVerb(tim.getVerb());
		}
		catch(InvalidVerbException e)
		{
			throw e;
		}
		
		try
		{
			worldOps.mapPlace(object);
		}
		catch(NotHereException g)
		{
			if (location != this.getLocation(object))
			{
				throw new InvalidTargetException();
			}
		}
		String[] result = verb.execute(subject, object);
		
		if (result[1] != null)
			b.broadcast(result[1], listContents(location));
		return result[0];
	}
	
	public void specifyBroadcaster(Broadcaster _b)
	{
		this.b = _b;
	} // specifyBroadcaster(Broadcaster)
	
} // interface World