;; The number guessing game

(use IO)
(use Int)
(use String)

(Project.config "title" "Guessing")

(def guessing true)
(def answer 0)

(defn start-new-game! []
  (do (println "~ The Number Guessing Game ~")
      (println "(Enter q to quit.)\n")

      (set! guessing true)
      (set! answer (random-between 1 100))

      (print "Please enter a number between 1 - 99: ")))

(defn exit! []
  (do (println "Good bye...")
      (set! guessing false)))

(defn play-again? [user-input]
  (if (= user-input "y\n") true false))

(defn correct! []
  (do (println "Correct!\n")
      (print "Play again? (y/n): ")
      (let [user-input (get-line)]
        (if (play-again? &user-input)
          (start-new-game!)
          (exit!)))))

(defn guess-again [low-or-high]
  (do (println &(str* @"Too " @low-or-high @"."))
      (print "\nPlease guess again: ")))

(defn main []
  (do (println "Seeding random number generator...\n")
      (Random.seed-from (Double.from-int (System.time)))
      (start-new-game!)
      (while guessing
        (let [user-input (get-line)
              guessed-num (from-string &user-input)]
          (if (= &user-input "q\n")
            (exit!)
            (match guessed-num
              (Maybe.Nothing) (print "Invalid input.\nPlease guess again: ")
              (Maybe.Just n)
                (cond (< n answer) (guess-again "low")
                      (> n answer) (guess-again "high")
                      (correct!))))))))