(.module:
  [library
   [lux "*"
    ["_" test {"+" [Test]}]
    [abstract
     [monad {"+" [do]}]]
    [control
     ["." maybe]
     ["." try]
     ["." exception {"+" [exception:]}]
     [concurrency
      ["." async {"+" [Async]}]]]
    [data
     ["." text ("#\." equivalence)
      ["%" format {"+" [format]}]]]
    [math
     ["." random]]
    [tool
     [compiler
      ["." version]
      ["." language "_"
       ["#/." lux "_"
        ["#" version]]]]]
    [world
     ["." console {"+" [Console Mock]}]]]]
  [///
   ["@." profile]]
  [\\program
   ["." /]])

(exception: .public console_is_closed!)

(implementation: mock
  (Mock [Bit Text])

  (def: (on_read [open? state])
    (if open?
      (try.of_maybe
       (do maybe.monad
         [head (text.char 0 state)
          [_ tail] (text.split_at 1 state)]
         (in [[open? tail] head])))
      (exception.except ..console_is_closed! [])))
  (def: (on_read_line [open? state])
    (if open?
      (try.of_maybe
       (do maybe.monad
         [[output state] (text.split_by text.new_line state)]
         (in [[open? state] output])))
      (exception.except ..console_is_closed! [])))
  (def: (on_write input [open? state])
    (if open?
      (#try.Success [open? (format state input)])
      (exception.except ..console_is_closed! [])))
  (def: (on_close [open? buffer])
    (if open?
      (#try.Success [false buffer])
      (exception.except ..console_is_closed! []))))

(def: .public echo
  (-> Text (Console Async))
  (|>> [true]
       (console.mock ..mock)
       console.async))

(def: .public test
  Test
  (<| (_.covering /._)
      (do random.monad
        [profile @profile.random]
        (in (do async.monad
              [.let [console (..echo "")]
               verdict (do (try.with async.monad)
                         [_ (/.do! console profile)
                          logging (\ console read_line [])]
                         (in (text\= (version.format language/lux.version)
                                     logging)))]
              (_.cover' [/.do!]
                        (try.else false verdict)))))))