// AdventureDemo.java
// This code was written in class on Thu 26-Mar-2009.
// As we wrote almost 200 lines in just over an hour,
// it does not have perfect style (eg, it is uncommented!).
// But it does establish a basic framework for writing
// a reasonably playable text adventure, and as such will
// serve as the starting point for hw9.  Enjoy!

import java.util.*;

class AdventureDemo {
  public static void main(String[] args) {
    Adventure game = new Adventure();
    game.play();
  }
}

class Adventure {
  private Room currentRoom;
  private ArrayList<Thing> inventory;
  
  public Adventure() {
    inventory = new ArrayList<Thing>();
    Room weh5419 = new Room("5419 Wean Hall");
    weh5419.addThing(new Thing("Computer"));
    Room wehLobby = new Room("Wean Hall 5th Floor Lobby");
    wehLobby.addThing(new Thing("Coffee Cart", "Cart"));
    weh5419.setExit(Direction.WEST, wehLobby);
    wehLobby.setExit(Direction.EAST, weh5419);
    currentRoom = weh5419;
  }
  
  public void play() {
    Scanner scanner = new Scanner(System.in);
    while (true) {
      System.out.println("\n-------------------------------");
      System.out.println("I am in " + currentRoom.getDescription());
      System.out.println("I can see:");
      int thingCount = currentRoom.getThingCount();
      if (thingCount == 0)
        System.out.println("   nothing!");
      else {
        for (int i=0; i<thingCount; i++)
          System.out.println("   " + currentRoom.getThing(i));
      }
      System.out.print("Command --> ");
      String[] cmds = scanner.nextLine().toLowerCase().split(" ");
      String verb = cmds[0];
      String noun = (cmds.length > 1) ? cmds[1] : "none";
      if (verb.equals("quit")) { System.out.println("Bye!"); break; }
      else if (verb.equals("go")) doGo(noun);
      else if (verb.equals("get")) doGet(noun);
      else if (verb.equals("put")) doPut(noun);
      else if (verb.equals("take") && noun.equals("inventory")) doTakeInventory();
      else if (verb.equals("i")) doTakeInventory();
      else System.out.println("I don't know how to " + verb);
    }
  }
  
  private void doTakeInventory() {
    System.out.println("I am carrying the following:");
      int thingCount = inventory.size();
      if (thingCount == 0)
        System.out.println("   nothing!");
      else {
        for (int i=0; i<thingCount; i++)
          System.out.println("   " + inventory.get(i));
      }
  }

  public Thing getThing(String thingName) {
    for (int i=0; i<inventory.size(); i++) {
      Thing thing = inventory.get(i);
      if (thing.getName().equals(thingName))
        return thing;
    }
    return null;
  }

  private void doPut(String thingName) {
    Thing thing = getThing(thingName);
    if (thing == null) {
      System.out.println("I am not carrying that!");
      return;
    }
    inventory.remove(thing);
    currentRoom.addThing(thing);
  }

  private void doGet(String thingName) {
    Thing thing = currentRoom.getThing(thingName);
    if (thing == null) {
      System.out.println("I do not see that here.");
      return;
    }
    inventory.add(thing);
    currentRoom.removeThing(thing);
  }
  
  private void doGo(String directionName) {
    int dir = Direction.getDirection(directionName);
    if (dir < 0) {
      System.out.println("I do not know that direction.");
      return;
    }
    Room newRoom = currentRoom.getExit(dir);
    if (newRoom == null) {
      System.out.println("I cannot go that way!");
      return;
    }
    currentRoom = newRoom;
  }
}

class Thing {
  private String description;
  private String name;
  
  public Thing(String name) {
    this.name = name.toLowerCase();
    this.description = name;
  }
  
  public Thing(String description, String name) {
    this.description = description;
    this.name = name.toLowerCase();
  }
  
  public String getDescription() { return description; }
  public String getName() { return name; }
  
  public String toString() { return description; }
}

class Direction {
  public static final int NORTH = 0;
  public static final int SOUTH = 1;
  public static final int EAST  = 2;
  public static final int WEST  = 3;
  public static final String[] dirNames = { "north", "south", "east", "west" };
  
  public static int getDirection(String dirName) {
    for (int dir=0; dir<4; dir++)
      if (dirNames[dir].equals(dirName))
        return dir;
    return -1;
  }
}

class Room {
  private String description;
  private Room[] exits;
  private ArrayList<Thing> things;
  
  public Room(String description) {
    this.description = description;
    exits = new Room[4];
    things = new ArrayList<Thing>();
  }
  
  public void setExit(int direction, Room room) {
    exits[direction] = room;
  }
  
  public Room getExit(int direction) {
    if ((direction < 0) || (direction > 3)) return null;
    return exits[direction];
  }
  
  public String getDescription() {
    return this.description;
  }
  
  public void addThing(Thing thing) {
    things.add(thing);
  }
  
  public void removeThing(Thing thing) {
    things.remove(thing);
  }
  
  public int getThingCount() { return things.size(); }
  
  public Thing getThing(int i) { return things.get(i); }
  
  public Thing getThing(String thingName) {
    for (int i=0; i<things.size(); i++) {
      Thing thing = things.get(i);
      if (thing.getName().equals(thingName))
        return thing;
    }
    return null;
  }
}