import java.io.BufferedWriter;
import java.io.IOException;
import java.util.Enumeration;
import java.util.NoSuchElementException;

import util.list.Vector;
import misc.Separators;
import integer.IntPair;
import string.StrUtil;

class Key extends Item {

    // para poupar memoria, sera' o mesmo do prototipo...
    // entao, nao podera' ser modificado;
    // se modificacao for futuramente necessaria, as
    // chaves terao de copiar os vetores de referencia a portas dos prototipos
    // (uma outra solucao seria copiar apenas quando ha' alteracao)
    private Vector doorReferences = null;

    Key(KeyProto kp) {
	super(kp);

	doorReferences = kp.doorReferences;
    }

    protected void finalize() {
	super.finalize();
    }

    int getType() {
	return T_KEY;
    }

    // Pode esta chave abrir uma porta de uma dada sala?
    boolean canUnlockDoor(Room rm, Door dr) {
	int  room      = rm.getId();
	int  direction = dr.getDirection();
	
	for (Enumeration enum = doorReferences.elements(); enum.hasMoreElements(); ) {
	    IntPair pair = (IntPair) enum.nextElement();
	    if (pair.getValue1() == room && pair.getValue2() == direction)
		return true;
	}

	Room destRoom  = dr.getDestinationRoom();
	int  destId    = destRoom.getId();
	int  invDir    = Door.getInverseDir(direction);
	Door invDoor   = null;

	try {
	    if (destRoom.findDoorByDir(invDir).getDestinationRoom() == rm)
		for (Enumeration enum = doorReferences.elements(); 
		     enum.hasMoreElements(); ) {
		    IntPair pair = (IntPair) enum.nextElement();
		    if (pair.getValue1() == destId && pair.getValue2() == invDir)
			return true;
		}
	}
	catch(NoSuchElementException e) {
	}
	
	return false;
    }

    /////////////
    // Sheetable:

    private String listDoors() {
	String list = "";
	for (Enumeration enum = doorReferences.elements(); enum.hasMoreElements(); ) {
	    IntPair pair = (IntPair) enum.nextElement();
	    list += Separators.NL + pair.getValue1() + " " + Door.getDirectionName(pair.getValue2());
	}
	return list;
    }

    public String getSheet() {
	return super.getSheet() + Separators.NL + "Portas:" + StrUtil.wrapList(listDoors(), "Nenhuma");
    }

    //
    /////////////

    private void saveDoors(BufferedWriter writer) throws IOException {
	for (Enumeration enum = doorReferences.elements(); enum.hasMoreElements(); ) {
	    IntPair pair = (IntPair) enum.nextElement();
	    writer.write((pair.getValue1() - ((KeyProto) prototype).savedZoneBase)+ " " + Door.getDirectionName(pair.getValue2()).charAt(0)); writer.newLine();
	}
	writer.write(Separators.EOR); writer.newLine();
    }

    void save(BufferedWriter writer) throws IOException {
	super.save(writer);
	saveDoors(writer);
    }
}