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(.using
 [lux "*"
  ["_" test {"+" Test}]
  [abstract
   [monad {"+" do}]]
  [control
   ["[0]" pipe]
   ["[0]" maybe]
   ["[0]" try]]
  [data
   [number
    ["n" nat]
    ["i" int]]
   ["[0]" text ("[1]#[0]" equivalence)
    ["%" format {"+" format}]]
   [collection
    ["[0]" array {"+" Array}]
    ["[0]" list ("[1]#[0]" functor)]]]
  [math
   ["r" random]]
  ["[0]" ffi {"+" import:}]
  [tool
   [compiler
    ["[0]" analysis]
    ["[0]" synthesis]]]]
 [///
  [common {"+" Runner}]])

(import: java/lang/Integer)

(def: (variant run)
  (-> Runner Test)
  (do [! r.monad]
    [num_tags (|> r.nat (# ! each (|>> (n.% 10) (n.max 2))))
     tag_in (|> r.nat (# ! each (n.% num_tags)))
     .let [last?_in (|> num_tags -- (n.= tag_in))]
     value_in r.i64]
    (_.test (%.symbol (symbol synthesis.variant))
            (|> (synthesis.variant [analysis.#lefts (if last?_in
                                                      (-- tag_in)
                                                      tag_in)
                                    analysis.#right? last?_in
                                    analysis.#value (synthesis.i64 value_in)])
                (run "variant")
                (pipe.case
                  {try.#Success valueT}
                  (let [valueT (:as (Array Any) valueT)]
                    (and (n.= 3 (array.size valueT))
                         (let [tag_out (:as java/lang/Integer (maybe.trusted (array.read! 0 valueT)))
                               last?_out (array.read! 1 valueT)
                               value_out (:as Any (maybe.trusted (array.read! 2 valueT)))
                               same_tag? (|> tag_out ffi.int_to_long (:as Nat) (n.= tag_in))
                               same_flag? (case last?_out
                                            {.#Some last?_out'}
                                            (and last?_in (text#= "" (:as Text last?_out')))

                                            {.#None}
                                            (not last?_in))
                               same_value? (|> value_out (:as Int) (i.= value_in))]
                           (and same_tag?
                                same_flag?
                                same_value?))))

                  {try.#Failure _}
                  false)))))

(def: (tuple run)
  (-> Runner Test)
  (do [! r.monad]
    [size (|> r.nat (# ! each (|>> (n.% 10) (n.max 2))))
     tuple_in (r.list size r.i64)]
    (_.test (%.symbol (symbol synthesis.tuple))
            (|> (synthesis.tuple (list#each (|>> synthesis.i64) tuple_in))
                (run "tuple")
                (pipe.case
                  {try.#Success tuple_out}
                  (let [tuple_out (:as (Array Any) tuple_out)]
                    (and (n.= size (array.size tuple_out))
                         (list.every? (function (_ [left right])
                                        (i.= left (:as Int right)))
                                      (list.zipped/2 tuple_in (array.list tuple_out)))))

                  {try.#Failure _}
                  false)))))

(def: .public (spec runner)
  (-> Runner Test)
  ($_ _.and
      (..variant runner)
      (..tuple runner)
      ))