(.module: [library [lux {"-" Name Type} [abstract [monad {"+" do}] [equivalence {"+" Equivalence}]] [control [pipe {"+" do> case>}] ["[0]" try {"+" Try}] ["[0]" exception {"+" exception:}] ["<>" parser ["<[0]>" xml {"+" Parser}] ["<[0]>" text]] [concurrency ["[0]" async {"+" Async}]]] [data ["[0]" product] ["[0]" text ["%" format] [encoding ["[0]" utf8]]] [format ["[0]" xml {"+" XML}]] [collection ["[0]" list ("[1]#[0]" functor)]]] [math [number ["n" nat]]] ["[0]" time {"+" Time} ["[0]" instant {"+" Instant}] ["[0]" date {"+" Date}] ["[0]" year] ["[0]" month]] [world [net ["[0]" uri {"+" URI}]]]]] ["[0]" // ["/[1]" // "_" [repository {"+" Repository}] ["[1][0]" artifact {"+" Group Name Version Artifact} ["[1]/[0]" time] ["[1]/[0]" type {"+" Type}] ["[1]/[0]" versioning {"+" Versioning}] ["[1]/[0]" snapshot ["[1]/[0]" version] ["[1]/[0]" stamp]]]]]) (type: .public Metadata (Record [#artifact Artifact #versioning Versioning])) (template [ ] [(def: xml.Tag ["" ])] [ "groupId"] [ "artifactId"] [ "version"] [ "metadata"] ) (template [
]
  [(def: 
     (->  XML)
     (|>> 
 {xml.#Text} list {xml.#Node  xml.attributes}))]

  [group_format Group .. (|>)]
  [name_format Name .. (|>)]
  [version_format Version .. (|>)]
  )

(def: .public (format (^slots [#artifact #versioning]))
  (-> Metadata XML)
  (let [(^slots [///artifact.#group ///artifact.#name ///artifact.#version]) artifact]
    {xml.#Node ..
               xml.attributes
               (list (..group_format group)
                     (..name_format name)
                     (..version_format version)
                     (///artifact/versioning.format versioning))}))

(def: (text tag)
  (-> xml.Tag (Parser Text))
  (<| (.node tag)
      .text))

(def: .public parser
  (Parser Metadata)
  (<| (.node ..)
      (do [! <>.monad]
        [group (.somewhere (..text ..))
         name (.somewhere (..text ..))
         version (.somewhere (..text ..))
         versioning (with_expansions [ [///artifact/snapshot/version.#extension ///artifact/type.jvm_library
                                                         ///artifact/snapshot/version.#value version
                                                         ///artifact/snapshot/version.#updated ///artifact/time.epoch]]
                      (|> (.somewhere ///artifact/versioning.parser)
                          (# ! each
                             (revised@ ///artifact/versioning.#versions
                                       (: (-> (List ///artifact/snapshot/version.Version)
                                              (List ///artifact/snapshot/version.Version))
                                          (|>> (case> (^ (list))
                                                      (list )

                                                      versions
                                                      versions)))))
                          (<>.else [///artifact/versioning.#snapshot {///artifact/snapshot.#Local}
                                    ///artifact/versioning.#last_updated ///artifact/time.epoch
                                    ///artifact/versioning.#versions (list )])))]
        (in [#artifact [///artifact.#group group
                        ///artifact.#name name
                        ///artifact.#version version]
             #versioning versioning]))))

(def: .public equivalence
  (Equivalence Metadata)
  ($_ product.equivalence
      ///artifact.equivalence
      ///artifact/versioning.equivalence
      ))

(def: .public uri
  (-> Artifact URI)
  //.remote_artifact_uri)

(def: .public (read repository artifact)
  (-> (Repository Async) Artifact (Async (Try Metadata)))
  (do async.monad
    [project (# repository download (..uri artifact))]
    (case project
      {try.#Success project}
      (in (|> project
              (do> try.monad
                   [(# utf8.codec decoded)]
                   [(# xml.codec decoded)]
                   [list (.result ..parser)])))
      
      {try.#Failure error}
      (in {try.#Success
           [#artifact artifact
            #versioning ///artifact/versioning.init]}))))

(def: .public (write repository artifact metadata)
  (-> (Repository Async) Artifact Metadata (Async (Try Any)))
  (|> metadata
      ..format
      (# xml.codec encoded)
      (# utf8.codec encoded)
      (# repository upload (..uri artifact))))