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(.using
 [lux {"-" function}
  ["_" test {"+" Test}]
  [abstract
   [monad {"+" do}]
   ["[0]" enum]]
  [control
   ["[0]" maybe]]
  [data
   [number
    ["n" nat]]
   [collection
    ["[0]" list ("[1]#[0]" functor)]]]
  [math
   ["r" random {"+" Random} ("[1]#[0]" monad)]]
  [tool
   [compiler
    [analysis {"+" Arity}]
    ["[0]" reference {"+" Register}]
    ["[0]" synthesis {"+" Synthesis}]]]]
 ["[0]" // "_"
  ["[1][0]" case]
  [//
   [common {"+" Runner}]]])

(def: max_arity
  Arity
  10)

(def: arity
  (Random Arity)
  (|> r.nat (r#each (|>> (n.% max_arity) (n.max 1)))))

(def: (local arity)
  (-> Arity (Random Register))
  (|> r.nat (r#each (|>> (n.% arity) ++))))

(def: function
  (Random [Arity Register Synthesis])
  (do r.monad
    [arity ..arity
     local (..local arity)]
    (in [arity local
         (synthesis.function/abstraction
          [synthesis.#environment (list)
           synthesis.#arity arity
           synthesis.#body (synthesis.variable/local local)])])))

(def: .public (spec run)
  (-> Runner Test)
  (do [! r.monad]
    [[arity local functionS] ..function
     partial_arity (|> r.nat (# ! each (|>> (n.% arity) (n.max 1))))
     inputs (r.list arity r.safe_frac)
     .let [expectation (maybe.trusted (list.item (-- local) inputs))
           inputsS (list#each (|>> synthesis.f64) inputs)]]
    (all _.and
         (_.test "Can read arguments."
                 (|> (synthesis.function/apply [synthesis.#function functionS
                                                synthesis.#arguments inputsS])
                     (run "with_local")
                     (//case.verify expectation)))
         (_.test "Can partially apply functions."
                 (or (n.= 1 arity)
                     (let [preS (list.first partial_arity inputsS)
                           postS (list.after partial_arity inputsS)
                           partialS (synthesis.function/apply [synthesis.#function functionS
                                                               synthesis.#arguments preS])]
                       (|> (synthesis.function/apply [synthesis.#function partialS
                                                      synthesis.#arguments postS])
                           (run "partial_application")
                           (//case.verify expectation)))))
         (_.test "Can read environment."
                 (or (n.= 1 arity)
                     (let [environment (|> partial_arity
                                           (enum.range n.enum 1)
                                           (list#each (|>> {reference.#Local})))
                           variableS (if (n.<= partial_arity local)
                                       (synthesis.variable/foreign (-- local))
                                       (synthesis.variable/local (|> local (n.- partial_arity))))
                           inner_arity (n.- partial_arity arity)
                           innerS (synthesis.function/abstraction
                                   [synthesis.#environment environment
                                    synthesis.#arity inner_arity
                                    synthesis.#body variableS])
                           outerS (synthesis.function/abstraction
                                   [synthesis.#environment (list)
                                    synthesis.#arity partial_arity
                                    synthesis.#body innerS])]
                       (|> (synthesis.function/apply [synthesis.#function outerS
                                                      synthesis.#arguments inputsS])
                           (run "with_foreign")
                           (//case.verify expectation)))))
         )))