import java.util.*;
/**
 * Class Room - a room in an adventure game.
 *
 * This class is part of the "World of Zuul" application. 
 * "World of Zuul" is a very simple, text based adventure game.  
 *
 * A "Room" represents one location in the scenery of the game.  It is 
 * connected to other rooms via exits.  The exits are labelled north, 
 * east, south, west.  For each direction, the room stores a reference
 * to the neighboring room, or null if there is no exit in that direction.
 * 
 * @author  Michael Kölling and David J. Barnes
 * @version 2016.02.29
 */
public class Room 
{
    private String description;
    private HashMap<String, Room> rooms = new HashMap<>();
    private HashMap<String, Food> foods = new HashMap<>();
    
    private Food food = null;
    //private Room northExit;
    //private Room southExit;
    //private Room eastExit;
    //private Room westExit;
    //private Room upExit;

    /**
     * Create a room described "description". Initially, it has
     * no exits. "description" is something like "a kitchen" or
     * "an open court yard".
     * @param description The room's description.
     */
    public Room(String description) 
    {
        this.description = description;
    }

    public void putFood(Food food){
        this.food = food;
    }
    
    public Food getFood(){
        return this.food;
    }
    
    /**
     * Define the exits of this room.  Every direction either leads
     * to another room or is null (no exit there).
     * @param north The north exit.
     * @param east The east east.
     * @param south The south exit.
     * @param west The west exit.
     */
    public void setExits(Room north, Room east, Room south, Room west, Room up, Room down, Room right, Room left) 
    {
        if(north != null) {
            this.rooms.put("north", north);
        }
        if(east != null) {
            this.rooms.put("east", east);
        }
        if(south != null) {
            this.rooms.put("south", south);
        }
        if(west != null) {
            this.rooms.put("west", west);
        }
        if(up != null){
            this.rooms.put("up", up);
        }
        if(down != null){
            this.rooms.put("down", down);
        }
        if(right != null){
            this.rooms.put("right", right);
        }
        if(left != null){
            this.rooms.put("left", left);
        }
    }
    
    public void setExit(String direction, Room room){
        rooms.put(direction,room);
    }
    
    /**
     * @return The description of the room.
     */
    public String getDescription()
    {
        return description;
    }

    public void printInfo(){
        System.out.println("你现在" + description);
        if(food != null){
            System.out.println("可获得： " + food);
        }
    }
    
    public void removeFood(){
        this.food = null;
    } 
    
    public void printExits(){
        System.out.print("Exits: ");
        for (String key : rooms.keySet()){
            System.out.print(key + " ");
        }
        System.out.println();
    }
    
    public Room goNext(String direction){
        return rooms.get(direction);
    }
}