(.require
 [library
  [lux (.except)
   [abstract
    [monad (.only do)]]
   [control
    ["[0]" try (.only Try)]
    [concurrency
     ["[0]" async (.only Async)]]]
   [data
    ["[0]" text (.only)
     ["%" \\format (.only format)]]]
   [world
    [program (.only Program)]
    ["[0]" file]
    [net
     ["[0]" uri (.only URI)]]]]]
 ["[0]" // (.only)
  ["/[1]" //
   ["[1][0]" local]
   ["[1][0]" metadata]]])

(def .public (root program fs)
  (-> (Program Async) (file.System Async) file.Path)
  (let [/ (at fs separator)]
    (|> ///local.repository
        (text.replaced uri.separator /)
        (format (at program home) /))))

(def (path /)
  (-> Text (-> URI file.Path))
  (text.replaced uri.separator /))

(def (absolute_path program fs)
  (-> (Program Async) (file.System Async) (-> URI file.Path))
  (let [/ (at fs separator)]
    (|>> ///metadata.local_uri
         (..path /)
         (format (..root program fs) /))))

(def .public (repository program fs)
  (-> (Program Async) (file.System Async) (//.Repository Async))
  (implementation
   (def description
     (..root program fs))

   (def download
     (|>> (..absolute_path program fs)
          (at fs read)))

   (def (upload uri content)
     (do [! async.monad]
       [.let [absolute_path (..absolute_path program fs uri)]
        ? (at fs file? absolute_path)
        _ (is (Async (Try Any))
              (if ?
                (in {try.#Success []})
                (case (file.parent fs absolute_path)
                  {.#Some parent}
                  (file.make_directories async.monad fs parent)

                  _
                  (in {try.#Success []}))))]
       (at fs write absolute_path content)))))