#! /bin/sh
exec huginn --no-argv -E "${0}"
#! huginn

import Algorithms as algo;
import Mathematics as math;
import RegularExpressions as re;

make_game( rndGen_ ) {
  board = "";
  for ( i : algo.range( 4 ) ) {
    board += ( " " + string( character( rndGen_.next() + integer( '1' ) ) ) );
  }
  return ( board.strip() );
}

main() {
  rndGen = math.randomizer( 9 );
  no = 0;
  dd = re.compile( "\\d\\d" );
  while ( true ) {
    no += 1;
    board = make_game( rndGen );
    print( "Your four digits: {}\nExpression {}: ".format( board, no ) );
    line = input();
    if ( line == none ) {
      print( "\n" );
      break;
    }
    line = line.strip();
    try {
      if ( line == "q" ) {
        break;
      }
      if ( ( pos = line.find_other_than( "{}+-*/() ".format( board ) ) ) >= 0 ) {
        print( "Invalid input found at: {}, `{}`\n".format( pos, line ) );
        continue;
      }
      if ( dd.match( line ).matched() ) {
        print( "Digit concatenation is forbidden.\n" );
        continue;
      }
      res = real( line );
      if ( res == 24.0 ) {
        print( "Thats right!\n" );
      } else {
        print( "Bad answer!\n" );
      }
    } catch ( Exception e ) {
      print( "Not an expression: {}\n".format( e.what() ) );
    }
  }
  return ( 0 );
}