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(.using
 [library
  [lux (.except all)
   [abstract
    [codec (.only Codec)]
    ["[0]" monad (.only do)]]
   [control
    ["[0]" try (.only Try)]
    [concurrency
     ["[0]" async (.only Async)]]]
   [data
    [binary (.only Binary)]
    ["[0]" product]
    [text
     ["%" \\format (.only format)]
     [encoding
      ["[0]" utf8]]]
    [collection
     ["[0]" dictionary]
     ["[0]" set (.only Set)]
     ["[0]" list (.open: "[1]#[0]" monoid)]]]
   [time
    ["[0]" instant (.only Instant)]]]]
 ["[0]" ///
  [repository (.only Repository)]
  ["[1][0]" hash (.only Hash)]
  ["[1][0]" package (.only Package)]
  ["[1][0]" artifact (.only Artifact)
   ["[1]/[0]" time]
   ["[1]/[0]" type]
   ["[1]/[0]" extension (.only Extension)]
   ["[1]/[0]" versioning]
   ["[1]/[0]" snapshot (.only)
    ["[1]/[0]" version (.only)
     ["[1]/[0]" value]]]]
  ["[1][0]" metadata
   ["[1]/[0]" artifact]
   ["[1]/[0]" snapshot (.only Metadata)]]
  ["[1][0]" dependency (.only Dependency)
   [resolution (.only Resolution)]
   ["[1]/[0]" status (.only Status)]]])

(def: (with_status repository version_template [artifact type] [data status])
  (-> (Repository Async) ///artifact.Version Dependency [Binary Status] (Async (Try Any)))
  (let [artifact (format (///artifact.uri version_template artifact)
                         (///artifact/extension.extension type))
        deploy_hash (is (All (_ h) (-> (Codec Text (Hash h)) Extension (Hash h) (Async (Try Any))))
                        (function (_ codec extension hash)
                          (|> hash
                              (at codec encoded)
                              (at utf8.codec encoded)
                              (at repository upload (format artifact extension)))))]
    (do [! (try.with async.monad)]
      [_ (at repository upload artifact data)]
      (case status
        {///dependency/status.#Unverified}
        (in [])
        
        {///dependency/status.#Partial partial}
        (case partial
          {.#Left sha-1}
          (deploy_hash ///hash.sha-1_codec ///artifact/extension.sha-1 sha-1)
          
          {.#Right md5}
          (deploy_hash ///hash.md5_codec ///artifact/extension.md5 md5))
        
        {///dependency/status.#Verified sha-1 md5}
        (do !
          [_ (deploy_hash ///hash.sha-1_codec ///artifact/extension.sha-1 sha-1)]
          (deploy_hash ///hash.md5_codec ///artifact/extension.md5 md5))))))

(def: (artifacts type status)
  (-> ///artifact/type.Type Status (List ///artifact/type.Type))
  (with_expansions [<sha-1> (format type ///artifact/extension.sha-1)
                    <md5> (format type ///artifact/extension.md5)]
    (list.partial type
                  (case status
                    {///dependency/status.#Unverified}
                    (list)
                    
                    {///dependency/status.#Partial partial}
                    (list (case partial
                            {.#Left _} <sha-1>
                            {.#Right _} <md5>))
                    
                    {///dependency/status.#Verified _}
                    (list <sha-1> <md5>)))))

(def: (update_snapshot [artifact type] now snapshot)
  (-> Dependency Instant Metadata (Try Metadata))
  (do try.monad
    [now (is (Try ///artifact/time.Time)
             (///artifact/time.of_instant now))
     .let [version_template (the ///artifact.#version artifact)
           snapshot (|> snapshot
                        (revised [///metadata/snapshot.#versioning ///artifact/versioning.#snapshot]
                                 (function (_ snapshot)
                                   (case snapshot
                                     {///artifact/snapshot.#Local}
                                     {///artifact/snapshot.#Local}
                                     
                                     {///artifact/snapshot.#Remote [_ build]}
                                     {///artifact/snapshot.#Remote [now (++ build)]})))
                        (has [///metadata/snapshot.#versioning ///artifact/versioning.#last_updated] now))
           versioning_snapshot (the [///metadata/snapshot.#versioning ///artifact/versioning.#snapshot] snapshot)]]
    (in (|> snapshot
            (has [///metadata/snapshot.#versioning ///artifact/versioning.#versions]
                 (list [///artifact/snapshot/version.#extension type
                        ///artifact/snapshot/version.#value (///artifact/snapshot/version/value.format
                                                             [///artifact/snapshot/version/value.#version version_template
                                                              ///artifact/snapshot/version/value.#snapshot versioning_snapshot])
                        ///artifact/snapshot/version.#updated now]))
            ... (has [///metadata/snapshot.#versioning ///artifact/versioning.#snapshot]
            ...       (list#composite (..artifacts type (product.right (the ///package.#library package)))
            ...                       (..artifacts ///artifact/type.pom (product.right (the ///package.#pom package)))))
            ))))

(def: .public (one repository [artifact type] package)
  (-> (Repository Async) Dependency Package (Async (Try Artifact)))
  (do [! async.monad]
    [now (async.future instant.now)
     .let [version_template (the ///artifact.#version artifact)]]
    (do (try.with !)
      [_ (with_status repository version_template [artifact type] (the ///package.#library package))

       _ (let [[pom pom_data status] (the ///package.#pom package)]
           (with_status repository
             version_template
             [artifact ///artifact/type.pom]
             [pom_data
              status]))

       snapshot (///metadata/snapshot.read repository artifact)
       snapshot (at ! in (..update_snapshot [artifact type] now snapshot))
       _ (///metadata/snapshot.write repository artifact snapshot)
       project (///metadata/artifact.read repository artifact)
       _ (|> project
             (has ///metadata/artifact.#versions (list version_template))
             (has ///metadata/artifact.#last_updated now)
             (///metadata/artifact.write repository artifact))]
      (in artifact))))

(def: .public (all repository resolution)
  (-> (Repository Async) Resolution (Async (Try (Set Artifact))))
  (let [! (try.with async.monad)]
    (|> (dictionary.entries resolution)
        (monad.each ! (function (_ [dependency package])
                        (..one repository dependency package)))
        (at ! each (set.of_list ///artifact.hash)))))