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(.module:
  [lux (#- Name)
   ["." host (#+ import:)]
   [abstract
    [monad (#+ do)]]
   [control
    ["." try (#+ Try)]
    ["." exception (#+ exception:)]
    ["." io (#+ IO)]
    [concurrency
     ["." promise (#+ Promise) ("#@." monad)]]]
   [data
    ["." product]
    ["." maybe]
    ["." text ("#@." equivalence)
     ["%" format (#+ format)]]
    [collection
     ["." list ("#@." functor)]
     ["." dictionary]
     ["." set]]]
   [world
    ["." file (#+ Path)]]]
  ["." /// #_
   ["#" profile]
   ["#." action]
   ["#." command (#+ Command)]
   ["#." local]
   ["#." cache]
   ["#." repository]
   ["#." shell]
   ["#." runtime]
   ["#." dependency (#+ Dependency)
    ["#/." resolution (#+ Resolution)]]
   ["#." artifact (#+ Group Name Artifact)
    ["#/." type]]])

(type: Finder
  (-> Resolution (Maybe Dependency)))

(def: (dependency-finder group name)
  (-> Group Name Finder)
  (|>> dictionary.entries
       (list.one (function (_ [dependency package])
                   (if (and (text@= group (get@ [#///dependency.artifact #///artifact.group] dependency))
                            (text@= name (get@ [#///dependency.artifact #///artifact.name] dependency)))
                     (#.Some dependency)
                     #.None)))))

(def: lux-group
  Group
  "com.github.luxlang")

(template [<name> <finder>]
  [(def: <finder>
     Finder
     (..dependency-finder ..lux-group <name>))]

  ["lux-jvm" jvm-compiler]
  ["lux-js" js-compiler]
  )

(exception: #export no-available-compiler)
(exception: #export no-specified-program)
(exception: #export no-specified-target)

(type: #export Compiler
  (#JVM Artifact)
  (#JS Artifact))

(def: (remove-dependency dependency)
  (-> Dependency (-> Resolution Resolution))
  (|>> dictionary.entries
       (list.filter (|>> product.left (is? dependency) not))
       (dictionary.from-list ///dependency.hash)))

(def: (compiler resolution)
  (-> Resolution (Try [Resolution Compiler]))
  (case [(..jvm-compiler resolution)
         (..js-compiler resolution)]
    [(#.Some dependency) _]
    (#try.Success [(..remove-dependency dependency resolution)
                   (#JVM (get@ #///dependency.artifact dependency))])
    
    [_ (#.Some dependency)]
    (#try.Success [(..remove-dependency dependency resolution)
                   (#JS (get@ #///dependency.artifact dependency))])

    _
    (exception.throw ..no-available-compiler [])))

(def: (libraries fs)
  (All [!] (-> (file.System !) Resolution (List Path)))
  (|>> dictionary.keys
       (list.filter (|>> (get@ #///dependency.type) (text@= ///artifact/type.lux-library)))
       (list@map (|>> (get@ #///dependency.artifact) (///local.path fs)))))

(import: java/lang/String)

## https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
(import: java/lang/System
  ["#::."
   (#static getProperty [java/lang/String] #io #? java/lang/String)])

(def: #export working-directory
  (IO (Try Text))
  (do io.monad
    [?value (java/lang/System::getProperty "user.dir")]
    (wrap (#try.Success (maybe.default "~" ?value)))))

(def: (singular-parameter name value)
  (-> Text Text Text)
  (format name " " value))

(def: (plural-parameter name values)
  (-> Text (List Text) Text)
  (|> values (list@map (|>> (format name " "))) (text.join-with " ")))

(def: #export (do! fs resolution profile)
  (-> (file.System Promise) Resolution (Command [Compiler Path]))
  (case [(get@ #///.program profile)
         (get@ #///.target profile)]
    [#.None _]
    (promise@wrap (exception.throw ..no-specified-program []))

    [_ #.None]
    (promise@wrap (exception.throw ..no-specified-target []))
    
    [(#.Some program) (#.Some target)]
    (do ///action.monad
      [[resolution compiler] (promise@wrap (..compiler resolution))
       working-directory (promise.future ..working-directory)
       #let [[prefix output] (case compiler
                               (#JVM artifact) [(///runtime.java (///local.path fs artifact))
                                                "program.jar"]
                               (#JS artifact) [(///runtime.node (///local.path fs artifact))
                                               "program.js"])
             cache-directory (format working-directory (:: fs separator) target)
             command (format prefix " build"
                             " " (..plural-parameter "--library" (..libraries fs resolution))
                             " " (..plural-parameter "--source" (set.to-list (get@ #///.sources profile)))
                             " " (..singular-parameter "--target" cache-directory)
                             " " (..singular-parameter "--module" program))]
       #let [_ (log! "[BUILD STARTED]")]
       outcome (///shell.execute command working-directory)
       #let [_ (log! "[BUILD ENDED]")]]
      (wrap [compiler
             (format cache-directory (:: fs separator) output)]))
    ))