(.module:
  [lux #*
   [program (#+ program:)]
   ["." ffi]
   ["." debug]
   [abstract
    ["." monad (#+ do)]]
   [control
    [pipe (#+ exec> case> new>)]
    ["." maybe]
    ["." try (#+ Try)]
    ["." exception (#+ exception:)]
    ["." io (#+ IO io)]
    [concurrency
     ["." promise (#+ Promise)]]]
   [data
    ["." text ("#\." hash)
     ["%" format (#+ format)]
     ["." encoding]]
    [collection
     ["." array (#+ Array)]]]
   [macro
    ["." template]]
   [math
    [number (#+ hex)
     ["n" nat]
     ["." i64]]]
   ["." world #_
    ["." file]
    ["#/." program]]
   ["@" target
    ["_" common_lisp]]
   [tool
    [compiler
     [phase (#+ Operation Phase)]
     [reference
      [variable (#+ Register)]]
     [language
      [lux
       [program (#+ Program)]
       [generation (#+ Context Host)]
       ["." synthesis]
       [analysis
        [macro (#+ Expander)]]
       [phase
        ["." extension (#+ Extender Handler)
         ["#/." bundle]
         ["." analysis #_
          ["#" common_lisp]]
         ["." generation #_
          ["#" common_lisp]]]
        [generation
         ["." reference]
         ["." common_lisp
          ["." runtime]]]]]]
     [default
      ["." platform (#+ Platform)]]
     [meta
      ["." packager #_
       ["#" script]]]]]]
  [program
   ["/" compositor
    ["#." cli]
    ["#." static]]])

(ffi.import: java/lang/String)

(ffi.import: (java/lang/Class a)
  ["#::."
   (#static forName [java/lang/String] #try (java/lang/Class java/lang/Object))])

(ffi.import: java/lang/Object
  ["#::."
   (toString [] java/lang/String)
   (getClass [] (java/lang/Class java/lang/Object))])

(ffi.import: java/lang/Long
  ["#::."
   (intValue [] java/lang/Integer)])

(ffi.import: java/lang/Integer
  ["#::."
   (longValue [] long)])

(ffi.import: java/lang/Number
  ["#::."
   (intValue [] java/lang/Integer)
   (longValue [] long)
   (doubleValue [] double)])

(ffi.import: org/armedbear/lisp/LispObject
  ["#::."
   (length [] int)
   (NTH [int] org/armedbear/lisp/LispObject)
   (SVREF [int] org/armedbear/lisp/LispObject)
   (elt [int] org/armedbear/lisp/LispObject)
   (execute [org/armedbear/lisp/LispObject org/armedbear/lisp/LispObject] #try org/armedbear/lisp/LispObject)])

... The org/armedbear/lisp/Interpreter must be imported before the
... other ones, because there is an order dependency in their static initialization.
(ffi.import: org/armedbear/lisp/Interpreter
  ["#::."
   (#static getInstance [] org/armedbear/lisp/Interpreter)
   (#static createInstance [] #? org/armedbear/lisp/Interpreter)
   (eval [java/lang/String] #try org/armedbear/lisp/LispObject)])

(ffi.import: org/armedbear/lisp/Symbol
  ["#::."
   (#static T org/armedbear/lisp/Symbol)])

(ffi.import: org/armedbear/lisp/DoubleFloat
  ["#::."
   (new [double])
   (doubleValue [] double)])

(ffi.import: org/armedbear/lisp/SimpleString
  ["#::."
   (new [java/lang/String])
   (getStringValue [] java/lang/String)])

(ffi.import: org/armedbear/lisp/LispInteger)

(ffi.import: org/armedbear/lisp/Bignum
  ["#::."
   (longValue [] long)
   (#static getInstance [long] org/armedbear/lisp/LispInteger)])

(ffi.import: org/armedbear/lisp/Fixnum
  ["#::."
   (longValue [] long)
   (#static getInstance [int] org/armedbear/lisp/Fixnum)])

(ffi.import: org/armedbear/lisp/Nil
  ["#::."
   (#static NIL org/armedbear/lisp/Symbol)])

(ffi.import: org/armedbear/lisp/SimpleVector)

(ffi.import: org/armedbear/lisp/Cons)

(ffi.import: org/armedbear/lisp/Closure)

(ffi.interface: LuxADT
  (getValue [] java/lang/Object))

(ffi.import: program/LuxADT
  ["#::."
   (getValue [] java/lang/Object)])

(template [<name>]
  [(exception: (<name> {object java/lang/Object})
     (exception.report
      ["Class" (java/lang/Object::toString (java/lang/Object::getClass object))]
      ["Object" (java/lang/Object::toString object)]))]

  [unknown_kind_of_object]
  [cannot_apply_a_non_function]
  )

(def: host_bit
  (-> Bit org/armedbear/lisp/LispObject)
  (|>> (case> #0 (org/armedbear/lisp/Nil::NIL)
              #1 (org/armedbear/lisp/Symbol::T))))

(def: (host_value value)
  (-> Any org/armedbear/lisp/LispObject)
  (let [to_sub (: (-> Any org/armedbear/lisp/LispObject)
                  (function (_ sub_value)
                    (let [sub_value (:as java/lang/Object sub_value)]
                      (`` (<| (~~ (template [<type> <then>]
                                    [(case (ffi.check <type> sub_value)
                                       (#.Some sub_value)
                                       (`` (|> sub_value (~~ (template.splice <then>))))
                                       #.None)]

                                    [[java/lang/Object] [host_value]]
                                    [java/lang/Boolean [..host_bit]]
                                    [java/lang/Integer [java/lang/Integer::longValue org/armedbear/lisp/Fixnum::getInstance]]
                                    [java/lang/Long [org/armedbear/lisp/Bignum::getInstance]]
                                    [java/lang/Double [org/armedbear/lisp/DoubleFloat::new]]
                                    [java/lang/String [org/armedbear/lisp/SimpleString::new]]
                                    ))
                              ... else
                              (:as org/armedbear/lisp/LispObject sub_value))))))]
    (`` (ffi.object [] org/armedbear/lisp/LispObject [program/LuxADT]
          []
          ... Methods
          (program/LuxADT
           [] (getValue self) java/lang/Object
           (:as java/lang/Object value))

          (org/armedbear/lisp/LispObject
           [] (length self)
           int
           (|> value
               (:as (Array java/lang/Object))
               array.size
               (:as java/lang/Long)
               java/lang/Number::intValue))

          (~~ (template [<name>]
                [(org/armedbear/lisp/LispObject
                  [] (<name> self {idx int})
                  org/armedbear/lisp/LispObject
                  (case (array.read! (|> idx java/lang/Integer::longValue (:as Nat))
                                     (:as (Array java/lang/Object) value))
                    (#.Some sub)
                    (to_sub sub)

                    #.None
                    (org/armedbear/lisp/Nil::NIL)))]

                [NTH] [SVREF] [elt]
                ))
          ))))

(type: (Reader a)
  (-> a (Try Any)))

(def: (read_variant read host_object)
  (-> (Reader org/armedbear/lisp/LispObject) (Reader org/armedbear/lisp/Cons))
  (do try.monad
    [tag (read (org/armedbear/lisp/LispObject::NTH +0 host_object))
     value (read (org/armedbear/lisp/LispObject::NTH +2 host_object))]
    (wrap [(java/lang/Long::intValue (:as java/lang/Long tag))
           (case (ffi.check org/armedbear/lisp/Nil (org/armedbear/lisp/LispObject::NTH +1 host_object))
             (#.Some _)
             (: Any (ffi.null))

             _
             (: Any synthesis.unit))
           value])))

(def: (read_tuple read host_object)
  (-> (Reader org/armedbear/lisp/LispObject) (Reader org/armedbear/lisp/SimpleVector))
  (let [size (.nat (org/armedbear/lisp/LispObject::length host_object))]
    (loop [idx 0
           output (:as (Array Any) (array.new size))]
      (if (n.< size idx)
        ... TODO: Start using "SVREF" instead of "elt" ASAP
        (case (read (org/armedbear/lisp/LispObject::elt (.int idx) host_object))
          (#try.Failure error)
          (#try.Failure error)

          (#try.Success member)
          (recur (++ idx) (array.write! idx (:as Any member) output)))
        (#try.Success output)))))

(def: (read host_object)
  (Reader org/armedbear/lisp/LispObject)
  (`` (<| (~~ (template [<class> <post_processing>]
                [(case (ffi.check <class> host_object)
                   (#.Some host_object)
                   (`` (|> host_object (~~ (template.splice <post_processing>))))

                   #.None)]

                [org/armedbear/lisp/Bignum [org/armedbear/lisp/Bignum::longValue #try.Success]]
                [org/armedbear/lisp/Fixnum [org/armedbear/lisp/Fixnum::longValue #try.Success]]
                [org/armedbear/lisp/DoubleFloat [org/armedbear/lisp/DoubleFloat::doubleValue #try.Success]]
                [org/armedbear/lisp/SimpleString [org/armedbear/lisp/SimpleString::getStringValue #try.Success]]
                [org/armedbear/lisp/Cons [(read_variant read)]]
                [org/armedbear/lisp/SimpleVector [(read_tuple read)]]
                [org/armedbear/lisp/Nil [(new> (#try.Success false) [])]]
                [org/armedbear/lisp/Closure [#try.Success]]
                [program/LuxADT [program/LuxADT::getValue #try.Success]]))
          (case (ffi.check org/armedbear/lisp/Symbol host_object)
            (#.Some host_object)
            (if (same? (org/armedbear/lisp/Symbol::T) host_object)
              (#try.Success true)
              (exception.throw ..unknown_kind_of_object (:as java/lang/Object host_object)))

            #.None)
          ... else
          (exception.throw ..unknown_kind_of_object (:as java/lang/Object host_object))
          )))

(def: ensure_macro
  (-> Macro (Maybe org/armedbear/lisp/Closure))
  (|>> (:as java/lang/Object) (ffi.check org/armedbear/lisp/Closure)))

(def: (call_macro inputs lux macro)
  (-> (List Code) Lux org/armedbear/lisp/Closure (Try (Try [Lux (List Code)])))
  (do try.monad
    [raw_output (org/armedbear/lisp/LispObject::execute (..host_value inputs) (..host_value lux) macro)]
    (:as (Try (Try [Lux (List Code)]))
         (..read raw_output))))

(def: (expander macro inputs lux)
  Expander
  (case (ensure_macro macro)
    (#.Some macro)
    (call_macro inputs lux macro)

    #.None
    (exception.throw ..cannot_apply_a_non_function (:as java/lang/Object macro))))

(def: host
  (IO (Host (_.Expression Any) (_.Expression Any)))
  (io (let [_ (org/armedbear/lisp/Interpreter::createInstance)
            interpreter (org/armedbear/lisp/Interpreter::getInstance)
            run! (: (-> (_.Code Any) (Try Any))
                    (function (_ code)
                      (do try.monad
                        [host_value (org/armedbear/lisp/Interpreter::eval (_.code code) interpreter)]
                        (read host_value))))]
        (: (Host (_.Expression Any) (_.Expression Any))
           (structure
            (def: (evaluate! context code)
              (run! code))
            
            (def: (execute! input)
              (org/armedbear/lisp/Interpreter::eval (_.code input) interpreter))
            
            (def: (define! context input)
              (let [global (reference.artifact context)
                    @global (_.var global)]
                (do try.monad
                  [#let [definition (_.defparameter @global input)]
                   _ (org/armedbear/lisp/Interpreter::eval (_.code definition) interpreter)
                   value (run! @global)]
                  (wrap [global value definition]))))

            (def: (ingest context content)
              (|> content (\ encoding.utf8 decode) try.trusted (:as (_.Expression Any))))

            (def: (re_learn context content)
              (run! content))
            
            (def: (re_load context content)
              (do try.monad
                [_ (run! content)]
                (run! (_.var (reference.artifact context)))))
            )))))

(def: platform
  (IO (Platform [_.Tag Register] (_.Expression Any) (_.Expression Any)))
  (do io.monad
    [host ..host]
    (wrap {#platform.&file_system (file.async file.default)
           #platform.host host
           #platform.phase common_lisp.generate
           #platform.runtime runtime.generate
           #platform.write (|>> _.code (\ encoding.utf8 encode))})))

(def: get_ecl_cli_inputs
  (let [@idx (_.var "i")]
    (_.call/* (_.var "loop")
              (list (_.var "for") @idx
                    (_.var "from") (_.int +0)
                    (_.var "below") (_.call/* (_.var "si:argc") (list))
                    (_.var "collect") (_.call/* (_.var "si:argv") (list @idx))))))

(def: (program context program)
  (Program (_.Expression Any) (_.Expression Any))
  (let [raw_inputs (_.progn (list (_.conditional+ (list "clisp") (_.var "ext:*args*"))
                                  (_.conditional+ (list "sbcl") (_.var "sb-ext:*posix-argv*"))
                                  (_.conditional+ (list "clozure") (_.call/* (_.var "ccl::command-line-arguments") (list)))
                                  (_.conditional+ (list "gcl") (_.var "si:*command-args*"))
                                  (_.conditional+ (list "ecl") ..get_ecl_cli_inputs)
                                  (_.conditional+ (list "cmu") (_.var "extensions:*command-line-strings*"))
                                  (_.conditional+ (list "allegro") (_.call/* (_.var "sys:command-line-arguments") (list)))
                                  (_.conditional+ (list "lispworks") (_.var "sys:*line-arguments-list*"))
                                  (_.list/* (list))))]
    (_.call/2 [(runtime.lux//program_args raw_inputs) _.nil] program)))

(for {@.old
      (def: extender
        Extender
        ... TODO: Stop relying on coercions ASAP.
        (<| (:as Extender)
            (function (@self handler))
            (:as Handler)
            (function (@self name phase))
            (:as Phase)
            (function (@self archive parameters))
            (:as Operation)
            (function (@self state))
            (:as Try)
            try.trusted
            (:as Try)
            (exec
              ("lux io log" "TODO: Extender")
              (#try.Failure "TODO: Extender"))))

      @.common_lisp
      (def: (extender handler)
        Extender
        (:expected handler))})

(def: (declare_success! _)
  (-> Any (Promise Any))
  (promise.future (\ world/program.default exit +0)))

(def: (then pre post)
  (-> (_.Expression Any) (_.Expression Any) (_.Expression Any))
  (_.manual (format (_.code pre)
                    text.new_line
                    (_.code post))))

(def: (scope body)
  (-> (_.Expression Any) (_.Expression Any))
  (let [@program (_.var "lux_program")]
    ($_ ..then
        (_.defun @program (_.args (list)) body)
        (_.call/* @program (list))
        )))

(`` (program: [service /cli.service]
      (let [extension ".cl"]
        (do io.monad
          [platform ..platform]
          (exec (do promise.monad
                  [_ (/.compiler {#/static.host @.common_lisp
                                  #/static.host_module_extension extension
                                  #/static.target (/cli.target service)
                                  #/static.artifact_extension extension}
                                 ..expander
                                 analysis.bundle
                                 (io.io platform)
                                 generation.bundle
                                 extension/bundle.empty
                                 ..program
                                 [(& _.Tag Register) (type (_.Expression Any)) (type (_.Expression Any))]
                                 ..extender
                                 service
                                 [(packager.package (_.manual "")
                                                    _.code
                                                    ..then
                                                    ..scope)
                                  (format (/cli.target service)
                                          (\ file.default separator)
                                          "program"
                                          extension)])]
                  (..declare_success! []))
            (io.io []))))))