//  GuessAWord.kt  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2024-01-20  File created.

/*  This program is a simple computer game in which the player has to
    guess the characters of a word, or the player may also try to guess
    the whole word.

    This program demonstrates:
      - the use of the standard StringBuilder class. StringBuilder objects
        are strings that can be modified, i.e., their characters can be
        changed. Standard String objects cannot be modified once they have
        been created.
      - the use of string methods such as uppercase()
*/

fun main()
{
   print( "\n This is a GUESS-A-WORD game.  \n\n" )

   val word_to_be_guessed = "VIENNA"

   val guessed_characters = 
                StringBuilder( "_________________________________________" )

   // We'll shorten the StringBuilder string so that its length is equal
   // to the length of the word to be guessed.

   guessed_characters.setLength( word_to_be_guessed.length )

   // Now guessed_characters refers to a StringBuilder that contains
   // a string that has as many underscore characters as the
   // word to be guessed.

   var game_is_over = false 


   while ( game_is_over == false )
   {
      print( " " + guessed_characters + "  " + "Give a character or word: " )

      var player_input = readLine()!!.uppercase()

      if ( player_input.length == 1 )
      {
         for ( character_index in 0 .. word_to_be_guessed.length - 1 )
         {
            if ( word_to_be_guessed[ character_index ] == player_input[ 0 ] )
            {
               guessed_characters[ character_index ] = player_input[ 0 ] 
            }
         }

         if ( guessed_characters.indexOf( "_" ) == -1 )
         {
            // "_" is not a substring in guessed characters.
            // This means that all characters have been guessed.

            game_is_over = true

            print(  " " + guessed_characters + "  Congratulations! \n\n" )
         }

      }
      else if ( player_input.length > 1 )
      {
         // The player tried to guess the whole word.

         if ( player_input.equals( word_to_be_guessed ) )
         {
            game_is_over = true

            print( "\n Congratulations! \n\n" )
         }
      }
      else
      {
         game_is_over = true ;

         print( " \n Game over. \n\n" )
      }

   } 
}