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(.using
 [library
  [lux (.except)
   ["_" test (.only Test)]
   [abstract
    ["[0]" monad (.only do)]]
   [control
    ["[0]" try (.only Try)]
    [concurrency
     ["[0]" async (.only Async)]]]
   [data
    [binary (.only Binary)]
    ["[0]" product]
    ["[0]" text (.open: "[1]#[0]" equivalence)
     ["%" \\format (.only format)]]
    [collection
     ["[0]" list (.open: "[1]#[0]" functor)]
     ["[0]" set]]]
   [math
    ["[0]" random (.only Random)]
    [number
     ["n" nat]]]
   [world
    ["[0]" file (.only Path)]]]]
 [//
  ["@[0]" version]
  [//
   ["@[0]" profile]
   [//
    [lux
     [data
      ["$[0]" binary]]]]]]
 [\\program
  ["[0]" / (.only)
   ["//[1]" ///
    ["[1]" profile]
    ["[1][0]" action (.only Action)]]]])

(def: node_name
  (Random Text)
  (random.alphabetic 10))

(def: (files prefix)
  (-> Path (Random (List [Path Binary])))
  (do [! random.monad]
    [count (at ! each (n.% 10) random.nat)
     names (random.set text.hash count ..node_name)
     contents (random.list count ($binary.random 100))]
    (in (list.zipped_2 (list#each (|>> (format prefix)) (set.list names))
                       contents))))

(def: (create_file! fs [path content])
  (-> (file.System Async) [Path Binary] (Async (Try Any)))
  (at fs write path content))

(def: (create_directory! fs path files)
  (-> (file.System Async) Path (List [Path Binary]) (Async (Try Any)))
  (do [! (try.with async.monad)]
    [_ (is (Async (Try Any))
           (file.make_directories async.monad fs path))
     _ (monad.each ! (..create_file! fs) files)]
    (in [])))

(def: (directory_exists? fs)
  (-> (file.System Async) Path (Async (Try Bit)))
  (|>> (at fs directory?) (try.lifted async.monad)))

(def: (file_exists? fs)
  (-> (file.System Async) Path (Async (Try Bit)))
  (|>> (at fs file?) (try.lifted async.monad)))

(def: (assets_exist? fs directory_path files)
  (-> (file.System Async) Path (List [Path Binary]) (Async (Try Bit)))
  (do [! (try.with async.monad)]
    [directory_exists? (..directory_exists? fs directory_path)
     files_exist? (is (Action (List Bit))
                      (|> files
                          (list#each product.left)
                          (monad.each ///action.monad (..file_exists? fs))))]
    (in (and directory_exists?
             (list.every? (|>>) files_exist?)))))

(def: .public test
  Test
  (<| (_.covering /._)
      (do [! random.monad]
        [context ..node_name
         target ..node_name
         sub ..node_name
         .let [fs (file.mock (at file.default separator))
               / (at fs separator)
               target_path (format context / target)
               sub_path (format target_path / sub)]
         direct_files (..files (format target_path /))
         sub_files (..files (format sub_path /))

         dummy @profile.random]
        (in (do async.monad
              [.let [console (@version.echo "")]
               verdict (do [! (try.with async.monad)]
                         [_ (..create_directory! fs target_path direct_files)
                          _ (..create_directory! fs sub_path sub_files)
                          context_exists!/pre (..directory_exists? fs context)
                          target_exists!/pre (..assets_exist? fs target_path direct_files)
                          sub_exists!/pre (..assets_exist? fs sub_path sub_files)
                          _ (/.do! console fs (has ///.#target target_path dummy))
                          context_exists!/post (..directory_exists? fs context)
                          target_exists!/post (..assets_exist? fs target_path direct_files)
                          sub_exists!/post (..assets_exist? fs sub_path sub_files)
                          logging (at console read_line [])]
                         (in (and (and context_exists!/pre
                                       context_exists!/post)
                                  (and target_exists!/pre
                                       (not target_exists!/post))
                                  (and sub_exists!/pre
                                       (not sub_exists!/post))
                                  (text#= (/.success target_path) logging))))]
              (_.coverage' [/.do! /.success]
                (try.else false verdict)))))))