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

;temporary hard-coded player and 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 "ME" room1 '() 'human 20 '() 50))
(set-room-contents! room1 (append (room-contents room1) (list plyr)))

(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)]
               [obj (find-obj what-str room)])
          (if (find-obj what-str room)
              (~a "There is a " what-str " in the area."
                  (describe-obj obj))
              (~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))

(define (describe-obj obj)
  (let ([output ""])
    (when (player? obj)
      (append-str! output "\nIt's you."))
    
    (when (item? obj)
      (append-str! output (~a "\nIt has a size of: " (item-size obj) "."))
      (when (equipment? obj)
        (append-str! output (~a "\nIt is a piece of equipment of type: " (equipment-type obj) "."))
        (when (weapon? obj)
          (append-str! output (~a "\nIt deals " (weapon-damage obj) " damage.")))
        (when (armor? obj)
          (append-str! output (~a "\nIt has a damage resistance of: " (armor-resistance obj) ".")))))

    (when (creature? obj)
      (append-str! output (~a "\nIts species is: " (creature-species obj) "."))
      (append-str! output (~a "\nIt's at " (creature-health obj) "HP."))
      (if (empty? (creature-equipment obj))
          (append-str! output (~a "\nIt doesn't look like it's carrying anything."))
          (append-str! output (~a "\nIt looks like it's carrying something."))))
    output))

(define-syntax-rule (append-str! str1 str2)
  (set! str1 (~a str1 str2)))