package de.szut.zuul;

import org.java_websocket.WebSocket;
import java.util.Scanner;

/**
 * This class is part of the "World of Zuul" application. 
 * "World of Zuul" is a very simple, text based adventure game.  
 * 
 * This parser reads user input and tries to interpret it as an "Adventure"
 * command. Every time it is called it reads a line from the terminal and
 * tries to interpret the line as a two word command. It returns the command
 * as an object of class Command.
 *
 * The parser has a set of known command words. It checks user input against
 * the known commands, and if the input is not one of the known commands, it
 * returns a command object that is marked as an unknown command.
 * 
 * @author  Michael Kölling and David J. Barnes
 * @version 2016.02.29
 */
public class Parser 
{
    private CommandWords commands;  // holds all valid command words

    /**
     * Create a parser to read from the terminal window.
     */
    public Parser() 
    {
        commands = new CommandWords();
    }

    /**
     * @return The next command from the user.
     */
    public Command getCommand(String inputLine, WebSocket conn)
    {
        if (inputLine == null || inputLine.trim().isEmpty()) {
            // Falls die Eingabe leer oder null ist, eine ungültige Eingabe zurückgeben
            return new Command(null, null);
        }

        // Entferne führende und nachfolgende Leerzeichen und teile die Eingabe in Wörter
        String[] words = inputLine.trim().split("\\s+");

        String word1 = words[0]; // Das erste Wort
        String word2 = words.length > 1 ? words[1] : null; // Das zweite Wort, falls vorhanden

        // Jetzt prüfen, ob das erste Wort ein gültiger Befehl ist.
        if (commands.isCommand(word1)) {
            return new Command(word1, word2);
        } else {
            // Wenn der Befehl ungültig ist, ein null-Command zurückgeben
            return new Command(null, word2);
        }
    }
    public String showCommands()
    {
        return commands.showAll();
    }
}