import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

/**
 * Class ini untuk parsing input user dan menginterpretasikan menjadi perintah
 * "Adventure".
 * Tiap kali dipanggil, class akan membaca line terminal dan interpretasi
 * menjadi 2 kata perintah.
 * 
 * @author Thomas Felix
 * @version 23 November 2020
 */

public class Parser
{
    private CommandWords commands;
    
    public Parser()
    {
        commands = new CommandWords();
    }
    
    public Command getCommand()
    {
        String inputLine = "";
        String word1;
        String word2;
        
        System.out.print("> ");
        
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        
        try
        {
            inputLine = reader.readLine();
        }
        
        catch (java.io.IOException exc)
        {
            System.out.println("There was an error during reading: " + exc.getMessage());
        }
        
        StringTokenizer tokenizer = new StringTokenizer(inputLine);
        
        if (tokenizer.hasMoreTokens())
        {
            word1 = tokenizer.nextToken();
        }
        
        else
        {
            word1 = null;
        }
        
        if (tokenizer.hasMoreTokens())
        {
            word2 = tokenizer.nextToken();
        }
        
        else
        {
            word2 = null;
        }
        
        if (commands.isCommand(word1))
        {
            return new Command(word1, word2);
        }
        
        else
        {
            return new Command(null, word2);
        }
    }
}