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(.using
 [library
  [lux "*"
   [abstract
    [equivalence {"+" Equivalence}]
    [monoid {"+" Monoid}]
    ["[0]" monad {"+" do}]]
   [control
    ["[0]" try {"+" Try}]
    ["[0]" exception {"+" exception:}]]
   [data
    ["[0]" text
     ["%" format {"+" format}]]
    [collection
     ["[0]" dictionary {"+" Dictionary}]
     ["[0]" set {"+" Set}]
     ["[0]" list ("[1]#[0]" mix)]]]]]
 ["[0]" // "_"
  ["[1]" profile {"+" Name Profile}]])

(def: .public file
  "project.lux")

(type: .public Project
  (Dictionary Name Profile))

(def: .public (project name profile)
  (-> Name Profile Project)
  (dictionary.of_list text.hash (list [name profile])))

(def: .public equivalence
  (Equivalence Project)
  (dictionary.equivalence //.equivalence))

(implementation: .public monoid
  (Monoid Project)

  (def: identity
    (dictionary.empty text.hash))

  (def: composite
    (dictionary.composite_with (# //.monoid composite))))

(exception: .public (unknown_profile [name Name])
  (exception.report
   "Name" (%.text name)))

(exception: .public (circular_dependency [dependee Name
                                          dependent Name])
  (exception.report
   "Dependent" (%.text dependent)
   "Dependee" (%.text dependee)))

(def: (profile' lineage project name)
  (-> (Set Name) Project Name (Try Profile))
  (case (dictionary.value name project)
    {.#Some profile}
    (case (list.example (set.member? lineage)
                        (the //.#parents profile))
      {.#Some ouroboros}
      (exception.except ..circular_dependency [ouroboros name])
      
      {.#None}
      (do [! try.monad]
        [parents (monad.each ! (profile' (set.has name lineage) project)
                             (the //.#parents profile))]
        (in (list#mix (function (_ parent child)
                        (# //.monoid composite child parent))
                      (has //.#parents (list) profile)
                      parents))))
    
    {.#None}
    (exception.except ..unknown_profile [name])))

(def: .public profile
  (-> Project Name (Try Profile))
  (..profile' (set.empty text.hash)))