(.module:
  [lux #*
   [abstract
    ["." equivalence (#+ Equivalence)]]
   [control
    ["." try (#+ Try) ("#\." functor)]
    [parser
     ["<.>" xml]]]
   [data
    ["." binary (#+ Binary)]
    [format
     ["." xml (#+ XML)]]
    [collection
     [set (#+ Set)]]]]
  ["." // #_
   [dependency (#+ Dependency)]
   ["/" profile]
   ["#." hash (#+ Hash SHA-1 MD5)]
   ["#." pom]])

(type: #export Origin
  #Local
  #Remote)

(structure: any-equivalence
  (Equivalence Any)

  (def: (= _ _)
    true))

(def: origin-equivalence
  (Equivalence Origin)
  ($_ equivalence.sum
      ..any-equivalence
      ..any-equivalence))

(type: #export Package
  {#origin Origin
   #library Binary
   #pom XML
   #sha-1 (Hash SHA-1)
   #md5 (Hash MD5)})

(template [<name> <tag>]
  [(def: #export <name>
     (-> Package Bit)
     (|>> (get@ #origin) (\ ..origin-equivalence = <tag>)))]

  [local? #Local]
  [remote? #Remote]
  )

(def: #export (local pom library)
  (-> XML Binary Package)
  {#origin #Local
   #library library
   #pom pom
   #sha-1 (//hash.sha-1 library)
   #md5 (//hash.md5 library)})

(def: #export dependencies
  (-> Package (Try (Set Dependency)))
  (|>> (get@ #pom)
       (<xml>.run //pom.parser)
       (try\map (get@ #/.dependencies))))

(def: #export equivalence
  (Equivalence Package)
  ($_ equivalence.product
      ..origin-equivalence
      binary.equivalence
      xml.equivalence
      //hash.equivalence
      //hash.equivalence
      ))