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(.using
  [library
   [lux "*"
    ["_" test {"+" Test}]
    [abstract
     [monad {"+" do}]]
    [control
     ["[0]" try {"+" Try}]
     ["[0]" exception {"+" exception:}]
     ["[0]" io {"+" IO}]
     [concurrency
      ["[0]" async {"+" Async}]]
     [parser
      ["[0]" environment {"+" Environment}]]]
    [data
     ["[0]" text ("[1]#[0]" equivalence)]
     [collection
      ["[0]" list]]]
    [math
     ["[0]" random]
     [number
      ["n" nat]
      ["i" int]]]]]
  [\\library
   ["[0]" /
    [//
     [file {"+" Path}]]]]
  [\\specification
   ["$[0]" /]])

(exception: dead)

(def: (mock [environment working_directory command arguments])
  (-> [Environment Path /.Command (List /.Argument)]
      (/.Mock Bit))
  (implementation
   (def: (on_read dead?)
     (if dead?
       (exception.except ..dead [])
       (do try.monad
         [echo (try.of_maybe (list.head arguments))]
         (in [dead? echo]))))
   
   (def: (on_fail dead?)
     (if dead?
       (exception.except ..dead [])
       {try.#Success [dead? ""]}))
   
   (def: (on_write message dead?)
     (if dead?
       (exception.except ..dead [])
       {try.#Success dead?}))

   (def: (on_destroy dead?)
     (if dead?
       (exception.except ..dead [])
       {try.#Success true}))

   (def: (on_await dead?)
     (if dead?
       (exception.except ..dead [])
       {try.#Success [true /.normal]}))))

(def: (io_shell command oops input destruction exit)
  (-> /.Command Text Text Text /.Exit (/.Shell IO))
  (implementation
   (def: (execute [environment working_directory command arguments])
     (<| io.io
         {try.#Success}
         (: (/.Process IO))
         (implementation
          (def: (read _)
            (io.io {try.#Success command}))
          (def: (fail _)
            (io.io {try.#Success oops}))
          (def: (write message)
            (io.io {try.#Failure message}))
          (def: (destroy _)
            (io.io {try.#Failure destruction}))
          (def: (await _)
            (io.io {try.#Success exit})))))))

(def: .public test
  Test
  (<| (_.covering /._)
      ($_ _.and
          (_.for [/.async /.mock /.Mock]
                 ($/.spec (/.async (/.mock (|>> ..mock {try.#Success})
                                           false))))
          (_.cover [/.error]
                   (not (i.= /.normal /.error)))
          (do random.monad
            [command (random.ascii/alpha 5)
             oops (random.ascii/alpha 5)
             input (random.ascii/alpha 5)
             destruction (random.ascii/alpha 5)
             exit random.int
             .let [shell (/.async (..io_shell command oops input destruction exit))]]
            (in (do [! async.monad]
                  [verdict (do (try.with !)
                             [process (# shell execute [environment.empty "~" command (list)])
                              read (# process read [])
                              failure (# process fail [])
                              wrote! (do !
                                       [write (# process write input)]
                                       (in {try.#Success (case write
                                                           {try.#Success _}
                                                           false
                                                           
                                                           {try.#Failure write}
                                                           (text#= input write))}))
                              destroyed! (do !
                                           [destroy (# process destroy [])]
                                           (in {try.#Success (case destroy
                                                               {try.#Success _}
                                                               false
                                                               
                                                               {try.#Failure destroy}
                                                               (text#= destruction destroy))}))
                              await (# process await [])]
                             (in (and (text#= command read)
                                      (text#= oops failure)
                                      wrote!
                                      destroyed!
                                      (i.= exit await))))]
                  (_.cover' [/.Shell]
                            (try.else false verdict)))))
          )))