#lang racket/gui
(require "structs.rkt")
(provide interpret)

;temporary hard-coded room with items for testing, before implementing procgen
(define room1 (room
               (pos 0 0)
               (dim 10 10)
               (list (weapon "BIG SWORD"  (pos 5 5) 4 'sword  5)
                     (armor "LEATHER CAP" (pos 5 9) 1 'helmet 2))))

(define plyr (player "YOU" room1 '() 'human 20 '() 50))

(define (interpret in)
  (let ([command (string-upcase in)])
    (if (or (string=? command "TYPE HERE...") (string=? command ""))
        "You need to type something in the box."
        (let* ([tokens (string-split command)]
               [verb (first tokens)]
               [args (rest tokens)])
          (case verb
            [("LOOK") (look args)]
            [else (~a "I don't understand the verb " verb ".")])))))

(define (look what)
  (let ([room (obj-pos plyr)])
    (if (empty? what)
        (string-join (obj-names (room-contents room)) ", "
                     #:before-first "In this area, there is "
                     #:before-last ", and "
                     #:after-last ".")
        (let ([what-str (string-join what)])
          (if (find-obj what-str room)
              (~a "There is a " what-str " in the area.")
              (~a "The \""  what-str "\" you're looking for isn't in this area."))))))
(define (find-obj obj room)
  (findf
   (λ (arg) (string=? obj (obj-name arg)))
   (room-contents room)))

(define (obj-names list)
  (map obj-name list))