# Copyright (c) 2020 Calvin Rose & contributors
#
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(import ./helper :prefix "" :exit true)
(start-suite 8)

###
### Compiling brainfuck to Janet.
###

(def- bf-peg
  "Peg for compiling brainfuck into a Janet source ast."
  (peg/compile
    ~{:+ (/ '(some "+") ,(fn [x] ~(+= (DATA POS) ,(length x))))
      :- (/ '(some "-") ,(fn [x] ~(-= (DATA POS) ,(length x))))
      :> (/ '(some ">") ,(fn [x] ~(+= POS ,(length x))))
      :< (/ '(some "<") ,(fn [x] ~(-= POS ,(length x))))
      :. (* "." (constant (prinf "%c" (get DATA POS))))
      :loop (/ (* "[" :main "]") ,(fn [& captures]
                                    ~(while (not= (get DATA POS) 0)
                                       ,;captures)))
      :main (any (+ :s :loop :+ :- :> :< :.)) }))

(defn bf
  "Run brainfuck."
  [text]
  (eval
    ~(let [DATA (array/new-filled 100 0)]
       (var POS 50)
       ,;(peg/match bf-peg text))))

(defn test-bf
  "Test some bf for expected output."
  [input output]
  (def b @"")
  (with-dyns [:out b]
    (bf input))
  (assert (= (string output) (string b))
          (string "bf input '"
                  input
                  "' failed, expected "
                  (describe output)
                  ", got "
                  (describe (string b))
                  ".")))

(test-bf "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++." "Hello World!\n")

(test-bf ">++++++++[-<+++++++++>]<.>>+>-[+]++>++>+++[>[->+++<<+++>]<<]>-----.>->
+++..+++.>-.<<+[>[+>+]>>]<--------------.>>.+++.------.--------.>+.>+."
         "Hello World!\n")

(test-bf "+[+[<<<+>>>>]+<-<-<<<+<++]<<.<++.<++..+++.<<++.<---.>>.>.+++.------.>-.>>--."
         "Hello, World!")

# Prompts and Labels

(assert (= 10 (label a (for i 0 10 (if (= i 5) (return a 10))))) "label 1")

(defn recur
  [lab x y]
  (when (= x y) (return lab :done))
  (def res (label newlab (recur (or lab newlab) (+ x 1) y)))
  (if lab :oops res))
(assert (= :done (recur nil 0 10)) "label 2")

(assert (= 10 (prompt :a (for i 0 10 (if (= i 5) (return :a 10))))) "prompt 1")

(defn- inner-loop
  [i]
  (if (= i 5)
    (return :a 10)))

(assert (= 10 (prompt :a (for i 0 10 (inner-loop i)))) "prompt 2")

(defn- inner-loop2
  [i]
  (try
    (if (= i 5)
      (error 10))
    ([err] (return :a err))))

(assert (= 10 (prompt :a (for i 0 10 (inner-loop2 i)))) "prompt 3")

# Match checks

(assert (= :hi (match nil nil :hi)) "match 1")
(assert (= :hi (match {:a :hi} {:a a} a)) "match 2")
(assert (= nil (match {:a :hi} {:a a :b b} a)) "match 3")
(assert (= nil (match [1 2] [a b c] a)) "match 4")
(assert (= 2 (match [1 2] [a b] b)) "match 5")

# And/or checks

(assert (= false (and false false)) "and 1")
(assert (= false (or false false)) "or 1")

# #300 Regression test

# Just don't segfault
(assert (peg/match '{:main (replace "S" {"S" :spade})} "S7") "regression #300")

# Test cases for #293
(assert (= :yes (match [1 2 3] [_ a _] :yes :no)) "match wildcard 1")
(assert (= :no (match [1 2 3] [__ a __] :yes :no)) "match wildcard 2")
(assert (= :yes (match [1 2 [1 2 3]] [_ a [_ _ _]] :yes :no)) "match wildcard 3")
(assert (= :yes (match [1 2 3] (_ (even? 2)) :yes :no)) "match wildcard 4")
(assert (= :yes (match {:a 1} {:a _} :yes :no)) "match wildcard 5")
(assert (= false (match {:a 1 :b 2 :c 3} {:a a :b _ :c _ :d _} :no {:a _ :b _ :c _} false :no)) "match wildcard 6")
(assert (= nil (match {:a 1 :b 2 :c 3} {:a a :b _ :c _ :d _} :no {:a _ :b _ :c _} nil :no)) "match wildcard 7")

# Regression #301
(def b (buffer/new-filled 128 0x78))
(assert (= 38 (length (buffer/blit @"" b -1 90))) "buffer/blit 1")

(def a @"abcdefghijklm")
(assert (deep= @"abcde" (buffer/blit @"" a -1 0 5)) "buffer/blit 2")
(assert (deep= @"bcde" (buffer/blit @"" a -1 1 5)) "buffer/blit 3")
(assert (deep= @"cde" (buffer/blit @"" a -1 2 5)) "buffer/blit 4")
(assert (deep= @"de" (buffer/blit @"" a -1 3 5)) "buffer/blit 5")

# chr
(assert (= (chr "a") 97) "chr 1")

# Detaching closure over non resumable fiber.
(do
  (defn f1
    [a]
    (defn f1 [] (++ (a 0)))
    (defn f2 [] (++ (a 0)))
    (error [f1 f2]))
  (def [_ [f1 f2]] (protect (f1 @[0])))
  # At time of writing, mark phase can detach closure envs.
  (gccollect)
  (assert (= 1 (f1)) "detach-non-resumable-closure 1")
  (assert (= 2 (f2)) "detach-non-resumable-closure 2"))

# Marshal closure over non resumable fiber.
(do
  (defn f1
    [a]
    (defn f1 [] (++ (a 0)))
    (defn f2 [] (++ (a 0)))
    (error [f1 f2]))
  (def [_ tup] (protect (f1 @[0])))
  (def [f1 f2] (unmarshal (marshal tup make-image-dict) load-image-dict))
  (assert (= 1 (f1)) "marshal-non-resumable-closure 1")
  (assert (= 2 (f2)) "marshal-non-resumable-closure 2"))

# Marshal closure over currently alive fiber.
(do
  (defn f1
    [a]
    (defn f1 [] (++ (a 0)))
    (defn f2 [] (++ (a 0)))
    (marshal [f1 f2] make-image-dict))
  (def [f1 f2] (unmarshal (f1 @[0]) load-image-dict))
  (assert (= 1 (f1)) "marshal-live-closure 1")
  (assert (= 2 (f2)) "marshal-live-closure 2"))

(do
  (var a 1)
  (defn b [x] (+ a x))
  (def c (unmarshal (marshal b)))
  (assert (= 2 (c 1)) "marshal-on-stack-closure 1"))

# Reduce2

(assert (= (reduce + 0 (range 1 10)) (reduce2 + (range 10))) "reduce2 1")
(assert (= (reduce * 1 (range 2 10)) (reduce2 * (range 1 10))) "reduce2 2")
(assert (= nil (reduce2 * [])) "reduce2 3")

# Accumulate

(assert (deep= (accumulate + 0 (range 5)) @[0 1 3 6 10]) "accumulate 1")
(assert (deep= (accumulate2 + (range 5)) @[0 1 3 6 10]) "accumulate2 1")
(assert (deep= @[] (accumulate2 + [])) "accumulate2 2")
(assert (deep= @[] (accumulate 0 + [])) "accumulate 2")

(end-suite)