(.module:
  [lux #*
   ["_" test (#+ Test)]
   [abstract
    ["." monad (#+ do)]]
   [control
    ["." try (#+ Try)]
    [concurrency
     ["." promise (#+ Promise)]]
    [security
     ["!" capability]]]
   [data
    [binary (#+ Binary)]
    ["." product]
    ["." text ("#\." equivalence)
     ["%" format (#+ format)]]
    [collection
     ["." list ("#\." functor)]
     ["." set]]]
   [math
    ["." random (#+ Random)]
    [number
     ["n" nat]]]
   [world
    ["." file (#+ Path File)]]]
  [//
   ["@." version]
   [//
    ["@." profile]
    [//
     [lux
      [data
       ["_." binary]]]]]]
  {#program
   ["." /
    ["//#" /// #_
     ["#" profile]
     ["#." action (#+ Action)]]]})

(def: node_name
  (Random Text)
  (random.ascii/alpha 10))

(def: (files prefix)
  (-> Path (Random (List [Path Binary])))
  (do {! random.monad}
    [count (\ ! map (n.% 10) random.nat)
     names (random.set text.hash count ..node_name)
     contents (random.list count (_binary.random 100))]
    (wrap (list.zip/2 (list\map (|>> (format prefix)) (set.to_list names))
                      contents))))

(def: (create_file! fs [path content])
  (-> (file.System Promise) [Path Binary] (Promise (Try Any)))
  (do {! (try.with promise.monad)}
    [file (: (Promise (Try (File Promise)))
             (file.get_file promise.monad fs path))]
    (!.use (\ file over_write) content)))

(def: (create_directory! fs path files)
  (-> (file.System Promise) Path (List [Path Binary]) (Promise (Try Any)))
  (do {! (try.with promise.monad)}
    [_ (: (Promise (Try Path))
          (file.make_directories promise.monad fs path))
     _ (monad.map ! (..create_file! fs) files)]
    (wrap [])))

(def: (directory_exists? fs)
  (-> (file.System Promise) Path (Promise (Try Bit)))
  (|>> (file.directory_exists? promise.monad fs) (try.lift promise.monad)))

(def: (file_exists? fs)
  (-> (file.System Promise) Path (Promise (Try Bit)))
  (|>> (file.file_exists? promise.monad fs) (try.lift promise.monad)))

(def: (assets_exist? fs directory_path files)
  (-> (file.System Promise) Path (List [Path Binary]) (Promise (Try Bit)))
  (do {! (try.with promise.monad)}
    [directory_exists? (..directory_exists? fs directory_path)
     files_exist? (: (Action (List Bit))
                     (|> files
                         (list\map product.left)
                         (monad.map ///action.monad (..file_exists? fs))))]
    (wrap (and directory_exists?
               (list.every? (|>>) files_exist?)))))

(def: #export test
  Test
  (<| (_.covering /._)
      (do {! random.monad}
        [context ..node_name
         target ..node_name
         sub ..node_name
         #let [fs (file.mock (\ file.default separator))
               / (\ 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]
        (wrap (do promise.monad
                [#let [console (@version.echo "")]
                 verdict (do {! (try.with promise.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 (set@ #///.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 (!.use (\ console read_line) [])]
                           (wrap (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))))]
                (_.cover' [/.do! /.success]
                          (try.default false verdict)))))))