/**
 *  Untuk memainkan gamenya, buat contoh metode ini, dan panggil
 *  metode "play"
 *  Kelas ini menginisialisasi yang lain : ia membuat ruangan, parser, dan
 *  memulai permainan. Juga mengevaluasi dan menjalankan perintah yang
 *  dikembalikan parser.


 * @author  M. Rayhan Raffi P.

 * @version 16-11-2020

 */



public class Game

{

    private Parser parser;

    private Room currentRoom;



    /**

     * 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()

    {

        Room outside, theater, pub, lab, office;



        // create the rooms

        outside = new Room("outside the main entrance of the university");

        theater = new Room("in a lecture theater");

        pub = new Room("in the campus pub");

        lab = new Room("in a computing lab");

        office = new Room("in the computing admin office");



        // initialise room exits

        outside.setExits(null, theater, lab, pub);

        theater.setExits(null, null, null, outside);

        pub.setExits(null, outside, null, null);

        lab.setExits(outside, office, null, null);

        office.setExits(null, null, null, lab);



        currentRoom = outside;  // start game outside

    }



    /**

     *  Main play routine.  Loops until end of play.

     */

    public void play()

    {

        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.  Good bye.");

    }



    /**

     * Print out the opening message for the player.

     */

    private void printWelcome()

    {

        System.out.println();

        System.out.println("Welcome to the World of Zuul!");

        System.out.println("World of Zuul is a new, incredibly boring adventure game.");

        System.out.println("Type 'help' if you need help.");

        System.out.println();

        System.out.println("You are " + currentRoom.getDescription());

        System.out.print("Exits: ");

        if(currentRoom.northExit != null) {

            System.out.print("north ");

        }

        if(currentRoom.eastExit != null) {

            System.out.print("east ");

        }

        if(currentRoom.southExit != null) {

            System.out.print("south ");

        }

        if(currentRoom.westExit != null) {

            System.out.print("west ");

        }

        System.out.println();

    }



    /**

     * Given a command, process (that is: execute) the command.

     * @param command The command to be processed.

     * @return true If the command ends the game, false otherwise.

     */

    private boolean processCommand(Command command)

    {

        boolean wantToQuit = false;



        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")) {

            goRoom(command);

        }

        else if (commandWord.equals("quit")) {

            wantToQuit = quit(command);

        }



        return wantToQuit;

    }



    // 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 lost. You are alone. You wander");

        System.out.println("around at the university.");

        System.out.println();

        System.out.println("Your command words are:");

        System.out.println("   go quit help");

    }



    /**

     * Try to go in 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 = null;

        if(direction.equals("north")) {

            nextRoom = currentRoom.northExit;

        }

        if(direction.equals("east")) {

            nextRoom = currentRoom.eastExit;

        }

        if(direction.equals("south")) {

            nextRoom = currentRoom.southExit;

        }

        if(direction.equals("west")) {

            nextRoom = currentRoom.westExit;

        }



        if (nextRoom == null) {

            System.out.println("There is no door!");

        }

        else {

            currentRoom = nextRoom;

            System.out.println("You are " + currentRoom.getDescription());

            System.out.print("Exits: ");

            if(currentRoom.northExit != null) {

                System.out.print("north ");

            }

            if(currentRoom.eastExit != null) {

                System.out.print("east ");

            }

            if(currentRoom.southExit != null) {

                System.out.print("south ");

            }

            if(currentRoom.westExit != null) {

                System.out.print("west ");

            }

            System.out.println();

        }

    }



    /**

     * "Quit" was entered. Check the rest of the command to see

     * whether we really quit the game.

     * @return true, if this command quits the game, false otherwise.

     */

    private boolean quit(Command command)

    {

        if(command.hasSecondWord()) {

            System.out.println("Quit what?");

            return false;

        }

        else {

            return true;  // signal that we want to quit

        }

    }

}