; Now we have native BF support

(def! with_update (fn* [arr idx val]
                   (if  (= idx 0)
                        (cons val (rest arr))
                        (cons (first arr) (with_update (rest arr) (- idx 1) val)))))

(add_grammer_rule 'bfs_atom ["<"]   (fn* [xs] (list 'left)))
(add_grammer_rule 'bfs_atom [">"]   (fn* [xs] (list 'right)))
(add_grammer_rule 'bfs_atom ["\\+"] (fn* [xs] (list 'plus)))
(add_grammer_rule 'bfs_atom ["-"]   (fn* [xs] (list 'minus)))
(add_grammer_rule 'bfs_atom [","]   (fn* [xs] (list 'in)))
(add_grammer_rule 'bfs_atom ["."]   (fn* [xs] (list 'out)))

(add_grammer_rule 'non_empty_bfs_list ['bfs_atom] (fn* [xs] (list (nth xs 0))))
(add_grammer_rule 'non_empty_bfs_list ['bfs_atom 'optional_WS 'non_empty_bfs_list] (fn* [xs] (cons (nth xs 0) (nth xs 2))))

(add_grammer_rule 'bfs_list [] (fn* [xs] xs))
(add_grammer_rule 'bfs_list ['non_empty_bfs_list] (fn* [xs] (nth xs 0)))

(add_grammer_rule 'bfs_atom ["\\[" 'bfs_list "]"] (fn* [xs]
                `(let* (f (fn* []
                                (if (= 0 (nth (deref arr) (deref ptr)))
                                    nil
                                    (do ,(nth xs 1) (f)))))
                       (f))))

(add_grammer_rule 'bfs ['bfs_list] (fn* [xs] (nth xs 0)))

(add_grammer_rule 'form ["bf" 'optional_WS "{" 'optional_WS 'bfs 'optional_WS "}"]
                        (fn* [xs]
                           `(fn* [input]
                             (let* (
                                    ;arr      (atom [0 0 0 0 0])
                                    arr      (atom (vector 0 0 0 0 0))
                                    output   (atom [])
                                    ptr      (atom 0)
                                    inptr    (atom 0)
                                    left     (fn* [] (swap! ptr (fn* [old] (- old 1))))
                                    right    (fn* [] (swap! ptr (fn* [old] (+ old 1))))
                                    plus     (fn* [] (swap! arr (fn* [old] (with_update old (deref ptr) (+ (nth (deref arr) (deref ptr)) 1)))))
                                    minus    (fn* [] (swap! arr (fn* [old] (with_update old (deref ptr) (- (nth (deref arr) (deref ptr)) 1)))))
                                    in       (fn* [] (let* ( h (nth input (deref inptr))
                                                             _ (swap! inptr (fn* [old] (+ old 1))))
                                                           (swap! arr (fn* [old] (with_update old (deref ptr) h)))))
                                    out      (fn* [] (swap! output (fn* [old] (cons (nth (deref arr) (deref ptr)) old)))))
                                (do ,(nth xs 4) (deref output))))))

(println (bf { ,>+++[<.>-] } [1337]))

;(def! main (fn* [argv] 2))
;(def! main (fn* [] (let* (a 13 b 12 c 11) b)))
;(def! main (fn* [] (do 13 12 11)))
;(def! main (fn* [] (if false 1 2)))
;(def! main (fn* [] (+ 13 1)))
;(def! main (fn* [] (- 13 -1)))
;(def! main (fn* [] (- 13 -1)))
;(def! main (fn* [] (+ 13 -)))
;(def! main (fn* [] (+ 13 1 2)))
;(def! main (fn* [] (cond false 1 false 2 true 3 true 4 false 5)))
;(def! main (fn* [] ((fn* [] (+ (+ 1 2) 3)) 13 1 2)))
;(def! main (fn* [] (((fn* [] (fn* [] 1))))))
;(def! main (fn* [] ((fn* [a b c] (- (+ a b) c)) 13 1 4)))
;(def! main (fn* [] (fn* [] 1)))

;(def! other (fn* [a b c] (- (+ a b) c)))
;(def! main (fn* [] (other 13 1 4)))

;(def! other 12)
;(def! main (fn* [] (+ other 4)))

;(def! fact (fn* [n] (if (<= n 1) 1 (* (fact (- n 1)) n))))
;(def! main (fn* [] (let* (to_ret (fact 5)) (do (println to_ret) to_ret))))

;(def! ret_with_call (fn* [n] (fn* [x] (+ n x))))
;(def! main (fn* [] ((ret_with_call 3) 5)))

(def! test (fn* [] (let* (
                        ;(l (list 3 4 5))
                        a 5
                        ;l '(a 4 5)
                        ;l (vector 3 4 5)
                        ;l [a 4 5]
                        l '[3 4 5]
                        ;l '[a 4 5]
                        )
                        (nth l 0))))
;(def! main (fn* [] (let* (it (test)) (do (println it) it))))
;(def! main (fn* [] (let* (it "asdf") (do (println it) 0))))
;(def! main (fn* [] (let* (it 'sym_baby) (do (println it) 0))))
;(def! main (fn* [] (let* (it [1 2 3]) (do (println it) 0))))
;(def! main (fn* [] (let* (it '(1 2 3)) (do (println it) 0))))
;(def! my_str "asdf")
;(def! main (fn* [] (do (println my_str) 0)))

;(def! main (fn* [] (let* (it (atom 7)) (do
;                                           (println it)
;                                           (println (deref it))
;                                           (reset! it 8)
;                                           (println (deref it))
;                                           (deref it)
;                                       ))))
;(def! my_atom (atom 5))
;(def! main (fn* [] (do
;                       (println my_atom)
;                       (println (deref my_atom))
;                       (reset! my_atom 1337)
;                       (println my_atom)
;                       (println (deref my_atom))
;                       7)))


;(def! inner (fn* [x] (do (throw (+ x 1)) (+ x 2))))
(def! inner (fn* [x] (do (println 7) (+ x 2))))
;(def! main (fn* [] (do (println (try*
;                                (inner 7)
;                                (catch* exp (+ exp 10))))
;                        7)))
(def! main (fn* [] (do (println (try*
                                (inner 7)))
                        7)))