(;module:
  lux
  (lux (control [monad #+ do])
       (data text/format
             (coll [list]))
       [meta #+ Monad<Meta> "Meta/" Monad<Meta>]
       [host #+ do-to])
  (luxc ["&" base]
        (lang ["la" analysis]
              ["ls" synthesis])
        ["&;" analyser]
        ["&;" synthesizer]
        (generator ["&;" common]
                   (host ["$" jvm]
                         (jvm ["$t" type]
                              ["$d" def]
                              ["$i" inst]))))
  [../runtime])

(def: $Object $;Type ($t;class "java.lang.Object" (list)))

(def: #export (generate-tuple generate members)
  (-> (-> ls;Synthesis (Meta $;Inst)) (List ls;Synthesis) (Meta $;Inst))
  (do Monad<Meta>
    [#let [size (list;size members)]
     _ (&;assert "Cannot generate tuples with less than 2 elements."
                 (n.>= +2 size))
     membersI (|> members
                  list;enumerate
                  (monad;map @ (function [[idx member]]
                                 (do @
                                   [memberI (generate member)]
                                   (wrap (|>. $i;DUP
                                              ($i;int (nat-to-int idx))
                                              memberI
                                              $i;AASTORE)))))
                  (:: @ map $i;fuse))]
    (wrap (|>. ($i;int (nat-to-int size))
               ($i;array $Object)
               membersI))))

(def: (flagI tail?)
  (-> Bool $;Inst)
  (if tail?
    ($i;string "")
    $i;NULL))

(def: #export (generate-variant generate tag tail? member)
  (-> (-> ls;Synthesis (Meta $;Inst)) Nat Bool ls;Synthesis (Meta $;Inst))
  (do Monad<Meta>
    [memberI (generate member)]
    (wrap (|>. ($i;int (nat-to-int tag))
               (flagI tail?)
               memberI
               ($i;INVOKESTATIC ../runtime;runtime-class
                                "variant_make"
                                ($t;method (list $t;int $Object $Object)
                                           (#;Some ($t;array +1 $Object))
                                           (list))
                                false)))))