Game.java

/**
 * Class Game - the main class of the adventure game
 *
 * 
 *  This class is the main class of a very simple, text based adventure game.  
 *  Users can walk around some scenery. That's all. 
 *  It should really be extended to make it more interesting!
 * 
 *  Maybe the plot of a CYOA novel.
 *  
 *  @author  Tiffany Duong
 *  @version .1

 */

class Game 
{
    private Parser parser;
    private Room currentRoom;
    String roomItems;
    String playerItems;
    String direction;
    String previousDirection;
    String back;
    Room previousRoom;
    private final int MAX_PURSE_WEIGHT = 15;
    int purseWeight = 0;

    /**
     * Create the game and initialise its internal map.
     */
    public Game() 
    {
        createRooms();
        parser = new Parser();
    }

    /**
     * Create all the rooms and link their exits together.
     */
    private void createRooms()
    {
        //HINT: If you want to access these in other methods, they should be changed to instance variables
        Room garden, entrance, dark, circle, watery, hallway, mud, stalagmite, stairs;  
        // create the rooms
        entrance = new Room("the entrance");
        garden = new Room("the sea garden");
        dark = new Room("the dark room");
        circle = new Room("the room of circles");
        watery = new Room("the water cave");
        hallway = new Room("the secret hallway");
        mud = new Room("the mud room");
        stalagmite = new Room("the stalagmite room");
        stairs = new Room("the stairs");

        // initialise room exits (north, east, south, west);
        entrance.setExits(watery, dark, null, garden);
        garden.setExits(null, entrance, null, null);
        dark.setExits(hallway, circle, null, entrance);
        circle.setExits(null, null, null, dark);
        watery.setExits(mud, null, entrance, null);
        hallway.setExits(stalagmite, null, dark, null);
        mud.setExits(null, stalagmite, watery, null);
        stalagmite.setExits(stairs, null, hallway, mud);
        stairs.setExits(null, null, stalagmite, null);

        //initialise room items and locations
        garden.refreshItems("food.4");
        circle.refreshItems("rock.2");
        mud.refreshItems("shovel.8");
        hallway.refreshItems("conch.5");

        currentRoom = entrance;  // start game at the entrance of the cave
        roomItems = currentRoom.getItems();
        playerItems = "";
        back = "";
    }

    /**
     *  Main play routine.  Loops until end of play.
     */
    public void play() 
    {            
        System.out.println("\f");	
        printWelcome();

        // Enter the main command loop.  Here we repeatedly read commands and
        // execute them until the game is over.

        boolean finished = false;
        while (!finished){
            Command command = parser.getCommand();
            finished = processCommand(command);
        }
        System.out.println("Thank you for playing!!!!");
    }

    /**
     * Print out the opening message for the player.
     */
    private void printWelcome()
    {
        System.out.println();
        System.out.println("Welcome to \"Will you Cave When you Sea Danger?\"!");
        System.out.println("You won the lottery and decided to take you and your friends to Vietnam, because why not?");
        System.out.print("After arriving in Hanoi, the northern capitol of the nation, you signed up for a kayaking trip in Ha Long Bay, a nearby popular tourist destination.");
        System.out.println("With its 775 islets, you had decided to venture off alone when you discovered a narrow opening to a beachy cave.");
        System.out.print("You park your oar and kayak on the shore of the islet and walk into the cave.");
        System.out.println("\n The last thing you see is a million shiny eyes looking down at you and you hear a screech. \n");
        System.out.println("You notice as soon as you wake up that there's a layer of water surrounding you.");
        System.out.print("You hadn't realized earlier but the tide was rising, and now the opening you had entered through is hidden and covered.");
        System.out.println("You're stuck in a magical sea cave and what will you do?");
        System.out.println(currentRoom.longDescription());
    }

    /**
     * Given a command, process (that is: execute) the command.
     * If this command ends the game, true is returned, otherwise false is
     * returned.
     */
    private boolean processCommand(Command command) 
    {
        if(command.isUnknown()){
            System.out.println("I don't know what you mean...");
            return false;
        }

        String commandWord = command.getCommandWord();
        if (commandWord.equals("help"))
            printHelp();
        else if (commandWord.equals("go")){
            //back = command;
            goRoom(command);
        } else if (commandWord.equals("quit")){
            if(command.hasSecondWord())
                System.out.println("Quit what?");
            else
                return true;  // signal that we want to quit
        }
        else if (commandWord.equals("back")){
            back(command);
        }
        else if (commandWord.equals("purse")){
            getPurse();
        }
        else if (commandWord.equals("pick")){
            pick(command);
        }
        else if (commandWord.equals("drop")){
            drop(command);
        }
        else if (commandWord.equals("look")){
            look(command);
        }
        return false;
    }

    // implementations of user commands:

    /**
     * Print out some help information.
     * Here we print some stupid, cryptic message and a list of the 
     * command words.
     */
    private void printHelp() 
    {
        System.out.println("You are in Japan.");
        System.out.println("around at Lake Forest High School.");
        System.out.println();
        System.out.println("Your command words are:");
        parser.showCommands();
    }

    /** 
     * Try to go to one direction. If there is an exit, enter the new
     * room, otherwise print an error message.
     */
    private void goRoom(Command command) 
    {
        if(!command.hasSecondWord()){
            // if there is no second word, we don't know where to go...
            System.out.println("Go where?");
            return;
        }

        String direction = command.getSecondWord();
        // Try to leave current room.
        Room nextRoom = currentRoom.nextRoom(direction);

        if (nextRoom == null)
            System.out.println("There is no door!");
        else {
            previousRoom = currentRoom;
            currentRoom = nextRoom;
            System.out.println(currentRoom.longDescription());
            roomItems = currentRoom.getItems();
        }
    }

    private void pick(Command command)
    {
        if(!command.hasSecondWord()){
            System.out.println("pick what?");
            return;
        }
        String object = command.getSecondWord();
        if (roomItems==null || roomItems.length()==0){
            System.out.println("There's nothing here for you to pick up.");
        }
        else if (roomItems.indexOf(object) == -1){
            System.out.println("There is no " + object + " here");
        }
        else if (Integer.parseInt(roomItems.substring(roomItems.indexOf(object) + object.length() +1)) + purseWeight>MAX_PURSE_WEIGHT){
            System.out.println("Your purse is too heavy. You should drop something before trying to pick something else up.");
        }
        else{
            playerItems += " " + roomItems.substring(roomItems.indexOf(object),(roomItems.indexOf(object) + object.length() +2)); //add room item w/ weight to player items
            playerItems.trim(); //trim spaces of player item string
            roomItems = roomItems.substring(0, roomItems.indexOf(object)) + roomItems.substring(roomItems.indexOf(object)+2 + object.length());
            //remove object from room item string
            purseWeight += Integer.parseInt(playerItems.substring(playerItems.indexOf(object) + object.length()+1, playerItems.indexOf(object) + object.length()+2));
            System.out.println("You have picked up the " + object + ".");
        }
    }

    /**
     * This command gives a survey of the room.
     */
    private void look(Command command)
    {
        //String roomItems = currentRoom.getItems();
        String weights = "1234567890";
        if (roomItems!=null && weights.indexOf(roomItems.substring(roomItems.length()-1))!=-1){
            if (command.hasSecondWord())
                System.out.println("Look is a one word command.");
            else{
                if (roomItems.lastIndexOf(" ")==0){
                    System.out.println("You see the" + roomItems.substring(0, roomItems.length()-2));
                }
                else{
                    System.out.println("You see a " + roomItems.substring(0, roomItems.lastIndexOf(" ")) + " and a " +
                        roomItems.substring(roomItems.lastIndexOf(" ")));
                }
            }
        }
        else{
            System.out.println("There are no items in this room.");
        }
    }

    /**
     * This is a description of each room. garden, entrance, dark, circle, watery, hallway, mud, stalagmite, stairs
     */
    private void roomDescription(){
        if (currentRoom.equals("entrance")){
            System.out.println("This is the opening atrium of the cave. You see openings on your left, forward, and right.");
        }
        else if (currentRoom.equals("garden")) {
            System.out.println("The magical sea garden is full of delicious food. Try some.");
        }
    }

    /**
     * 
     */
    private void drop(Command command){
        if(!command.hasSecondWord()){
            System.out.println("drop what?");
            return;
        }
        String object = command.getSecondWord();
        if (playerItems==null || playerItems.length()==0){
            System.out.println("You have no items to drop.");
        }
        else if (playerItems.indexOf(object) == -1){
            System.out.println("There is no " + object + " for you to drop.");
        }
        else{
            roomItems += " " + 
            playerItems.substring(playerItems.indexOf(object), playerItems.indexOf(object) + object.length() + 2);
            purseWeight -= Integer.parseInt(playerItems.substring(playerItems.indexOf(object) + object.length()+1, playerItems.indexOf(object) + object.length()+2));
            //currentRoom.updateRoomItems(roomItems);
            playerItems = playerItems.substring(0, playerItems.indexOf(object)) + playerItems.substring(playerItems.indexOf(object)+object.length()+2);
            System.out.println("You have dropped the " + object + ".");
        }
    }

    /**
     * This is a back command to return to the previous room.
     */
    private void back(Command command)
    {
        if (command.hasSecondWord()){
            System.out.println("Back is a one word command.");
        }
        else if (previousRoom!=null){
            currentRoom = previousRoom;
            currentRoom.getItems();
            roomDescription();
        }
        else{
            System.out.println("There is no back.");
        }
    }

    /**
     * 
     */
    private void getPurse()
    {
        System.out.println("Your purse has a weight of " + purseWeight + ".");
        if (playerItems.length()>1)
        {
            playerItems.trim();
            System.out.println("You have: " + playerItems);
        }
    }
}