package samples.input;   // A unique class name prefix
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.ArrayList;

public class startIt  {

   private static final String errorMsg01 = new String("Invalid Input");

   private static class myPrompt {

      private String promptLine;

      public myPrompt(String s) {
         this.promptLine = s;
      }

      private String thisCommand() throws IOException {

         BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
         String thisLine = new String();

         System.out.print(this.promptLine + "> ");
         thisLine = in.readLine();
         return (thisLine);

      }

   }

   public static void main(String[] args) {

// Your code begins here.
      int x;
      myPrompt mp_obj = new myPrompt("Waiting for your input");
      ArrayList<String> lst_obj = new ArrayList<String>();
      String s = new String();
      String s_converted = new String();

      System.out.println("--- The World's Java Console ---");
      System.out.println("Type 'exit' to quit.");

      for (;;) {
         try {
            s = mp_obj.thisCommand();
         }
         catch(Exception e) {
            System.out.println();
            System.out.println(errorMsg01);
         }
         if (s == null) {
            System.out.println();
            System.out.println(errorMsg01);
            break;
         }
         switch (s) {
            case "":
               System.out.println("You've written none.");
               break;
            default:
               System.out.println("You've written '" + s + "'.");
               break;
         }
         s_converted = s.toLowerCase().trim();
         lst_obj.add(s);
         if ((s_converted.equals("exit")) || (s_converted.equals("quit"))) {
            break;
         }
         switch (s_converted) {
            case "history":
               for (x = 0; x < lst_obj.size(); x++) {
                  System.out.println(lst_obj.get(x));
               }
               break;
            case "clear":
               lst_obj.clear();
               System.out.println("The commands' history has been erased.");
               break;
         }
      }

      System.out.println("Good-bye!");
      System.out.println();

      System.out.println("* Copyleft 2014 Artem Efremov");
      System.out.println("*");
      System.out.println("* Redistribution and use in source and binary forms, with or without modification, are permitted.");


   }

}