(.module:
  [library
   [lux (#- Type int char try)
    ["." ffi (#+ import: do_to)]
    [abstract
     [monad (#+ do)]]
    [control
     ["." function]
     ["." maybe]
     ["." try]
     ["p" parser
      ["s" code]]]
    [data
     ["." product]
     [collection
      ["." list ("#@." functor)]]]
    [macro
     [syntax (#+ syntax:)]
     ["." code]
     ["." template]]
    [math
     [number
      ["n" nat]
      ["i" int]]]
    [target
     [jvm
      [encoding
       ["." name (#+ External)]]
      ["." type (#+ Type) ("#@." equivalence)
       [category (#+ Void Value Return Method Primitive Object Class Array Var Parameter)]
       ["." box]
       ["." descriptor]
       ["." reflection]]]]
    [tool
     [compiler
      [phase (#+ Operation)]]]]]
  ["." // (#+ Inst)])

(def: class_name (|>> type.descriptor descriptor.class_name name.read))
(def: descriptor (|>> type.descriptor descriptor.descriptor))
(def: reflection (|>> type.reflection reflection.reflection))

... [Host]
(import: java/lang/Object)
(import: java/lang/String)

(syntax: (declare [codes (p.many s.local_identifier)])
  (|> codes
      (list@map (function (_ code) (` ((~' #static) (~ (code.local_identifier code)) (~' int)))))
      in))

(`` (import: org/objectweb/asm/Opcodes
      ["#::."
       (#static NOP int)

       ... Conversion
       (~~ (declare D2F D2I D2L
                    F2D F2I F2L
                    I2B I2C I2D I2F I2L I2S
                    L2D L2F L2I))

       ... Primitive
       (~~ (declare T_BOOLEAN T_CHAR T_FLOAT T_DOUBLE
                    T_BYTE T_SHORT T_INT T_LONG))

       ... Class
       (~~ (declare CHECKCAST NEW INSTANCEOF))
       
       ... Stack
       (~~ (declare DUP DUP_X1 DUP_X2
                    DUP2 DUP2_X1 DUP2_X2
                    POP POP2
                    SWAP))
       
       ... Jump
       (~~ (declare IF_ICMPEQ IF_ICMPGT IF_ICMPLT
                    IF_ICMPNE IF_ICMPGE IF_ICMPLE
                    IF_ACMPEQ IF_ACMPNE IFNULL IFNONNULL
                    IFEQ IFNE IFLT IFLE IFGT IFGE
                    GOTO))

       (~~ (declare BIPUSH SIPUSH))
       (~~ (declare ICONST_M1 ICONST_0 ICONST_1 ICONST_2 ICONST_3 ICONST_4 ICONST_5
                    LCONST_0 LCONST_1
                    FCONST_0 FCONST_1 FCONST_2
                    DCONST_0 DCONST_1))
       (#static ACONST_NULL int)
       
       ... Var
       (~~ (declare IINC
                    ILOAD LLOAD FLOAD DLOAD ALOAD
                    ISTORE LSTORE FSTORE DSTORE ASTORE))
       
       ... Arithmetic
       (~~ (declare IADD ISUB IMUL IDIV IREM INEG
                    LADD LSUB LMUL LDIV LREM LNEG LCMP
                    FADD FSUB FMUL FDIV FREM FNEG FCMPG FCMPL
                    DADD DSUB DMUL DDIV DREM DNEG DCMPG DCMPL))
       
       ... Bit-wise
       (~~ (declare IAND IOR IXOR ISHL ISHR IUSHR
                    LAND LOR LXOR LSHL LSHR LUSHR))

       ... Array
       (~~ (declare ARRAYLENGTH NEWARRAY ANEWARRAY
                    AALOAD AASTORE
                    BALOAD BASTORE
                    SALOAD SASTORE
                    IALOAD IASTORE
                    LALOAD LASTORE
                    FALOAD FASTORE
                    DALOAD DASTORE
                    CALOAD CASTORE))
       
       ... Member
       (~~ (declare GETSTATIC PUTSTATIC GETFIELD PUTFIELD
                    INVOKESTATIC INVOKESPECIAL INVOKEVIRTUAL INVOKEINTERFACE))

       (#static ATHROW int)

       ... Concurrency
       (~~ (declare MONITORENTER MONITOREXIT))
       
       ... Return
       (~~ (declare RETURN IRETURN LRETURN FRETURN DRETURN ARETURN))]
      ))

(import: org/objectweb/asm/Label
  ["#::."
   (new [])])

(import: org/objectweb/asm/MethodVisitor
  ["#::."
   (visitCode [] void)
   (visitMaxs [int int] void)
   (visitEnd [] void)
   (visitInsn [int] void)
   (visitLdcInsn [java/lang/Object] void)
   (visitFieldInsn [int java/lang/String java/lang/String java/lang/String] void)
   (visitTypeInsn [int java/lang/String] void)
   (visitVarInsn [int int] void)
   (visitIntInsn [int int] void)
   (visitMethodInsn [int java/lang/String java/lang/String java/lang/String boolean] void)
   (visitLabel [org/objectweb/asm/Label] void)
   (visitJumpInsn [int org/objectweb/asm/Label] void)
   (visitTryCatchBlock [org/objectweb/asm/Label org/objectweb/asm/Label org/objectweb/asm/Label java/lang/String] void)
   (visitLookupSwitchInsn [org/objectweb/asm/Label [int] [org/objectweb/asm/Label]] void)
   (visitTableSwitchInsn [int int org/objectweb/asm/Label [org/objectweb/asm/Label]] void)
   ])

... [Insts]
(def: .public make_label
  (All [s] (Operation s org/objectweb/asm/Label))
  (function (_ state)
    (#try.Success [state (org/objectweb/asm/Label::new)])))

(def: .public (with_label action)
  (All [a] (-> (-> org/objectweb/asm/Label a) a))
  (action (org/objectweb/asm/Label::new)))

(template [<name> <type> <prepare>]
  [(def: .public (<name> value)
     (-> <type> Inst)
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitLdcInsn (<prepare> value)))))]

  [boolean Bit  function.identity]
  [int     Int  ffi.long_to_int]
  [long    Int  function.identity]
  [double  Frac function.identity]
  [char    Nat  (|>> .int ffi.long_to_int ffi.int_to_char)]
  [string  Text function.identity]
  )

(template: (!prefix short)
  [(`` ((~~ (template.identifier ["org/objectweb/asm/Opcodes::" short]))))])

(template [<constant>]
  [(def: .public <constant>
     Inst
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitInsn (!prefix <constant>)))))]

  [ICONST_M1] [ICONST_0] [ICONST_1] [ICONST_2] [ICONST_3] [ICONST_4] [ICONST_5]
  [LCONST_0] [LCONST_1]
  [FCONST_0] [FCONST_1] [FCONST_2]
  [DCONST_0] [DCONST_1]
  )

(def: .public NULL
  Inst
  (function (_ visitor)
    (do_to visitor
      (org/objectweb/asm/MethodVisitor::visitInsn (!prefix ACONST_NULL)))))

(template [<constant>]
  [(def: .public (<constant> constant)
     (-> Int Inst)
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitIntInsn (!prefix <constant>) constant))))]

  [BIPUSH]
  [SIPUSH]
  )

(template [<name>]
  [(def: .public <name>
     Inst
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitInsn (!prefix <name>)))))]

  [NOP]
  
  ... Stack
  [DUP] [DUP_X1] [DUP_X2] [DUP2] [DUP2_X1] [DUP2_X2]
  [POP] [POP2]
  [SWAP]

  ... Conversions
  [D2F] [D2I] [D2L]
  [F2D] [F2I] [F2L]
  [I2B] [I2C] [I2D] [I2F] [I2L] [I2S]
  [L2D] [L2F] [L2I]

  ... Integer arithmetic
  [IADD] [ISUB] [IMUL] [IDIV] [IREM] [INEG]

  ... Integer bitwise
  [IAND] [IOR] [IXOR] [ISHL] [ISHR] [IUSHR]
  
  ... Long arithmetic
  [LADD] [LSUB] [LMUL] [LDIV] [LREM] [LNEG]
  [LCMP]

  ... Long bitwise
  [LAND] [LOR] [LXOR] [LSHL] [LSHR] [LUSHR]

  ... Float arithmetic
  [FADD] [FSUB] [FMUL] [FDIV] [FREM] [FNEG] [FCMPG] [FCMPL]

  ... Double arithmetic
  [DADD] [DSUB] [DMUL] [DDIV] [DREM] [DNEG]
  [DCMPG] [DCMPL]

  ... Array
  [ARRAYLENGTH]
  [AALOAD] [AASTORE]
  [BALOAD] [BASTORE]
  [SALOAD] [SASTORE]
  [IALOAD] [IASTORE]
  [LALOAD] [LASTORE]
  [FALOAD] [FASTORE]
  [DALOAD] [DASTORE]
  [CALOAD] [CASTORE]

  ... Exceptions
  [ATHROW]

  ... Concurrency
  [MONITORENTER] [MONITOREXIT]

  ... Return
  [RETURN] [IRETURN] [LRETURN] [FRETURN] [DRETURN] [ARETURN]
  )

(type: .public Register Nat)

(template [<name>]
  [(def: .public (<name> register)
     (-> Register Inst)
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitVarInsn (!prefix <name>) (.int register)))))]

  [IINC]
  [ILOAD] [LLOAD] [FLOAD] [DLOAD] [ALOAD]
  [ISTORE] [LSTORE] [FSTORE] [DSTORE] [ASTORE]
  )

(template [<name> <inst>]
  [(def: .public (<name> class field type)
     (-> (Type Class) Text (Type Value) Inst)
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitFieldInsn (<inst>) (..class_name class) field (..descriptor type)))))]

  [GETSTATIC org/objectweb/asm/Opcodes::GETSTATIC]
  [PUTSTATIC org/objectweb/asm/Opcodes::PUTSTATIC]
  
  [PUTFIELD  org/objectweb/asm/Opcodes::PUTFIELD]
  [GETFIELD  org/objectweb/asm/Opcodes::GETFIELD]
  )

(template [<category> <instructions>+]
  [(`` (template [<name> <inst>]
         [(def: .public (<name> class)
            (-> (Type <category>) Inst)
            (function (_ visitor)
              (do_to visitor
                (org/objectweb/asm/MethodVisitor::visitTypeInsn (<inst>) (..class_name class)))))]

         (~~ (template.spliced <instructions>+))))]

  [Object
   [[CHECKCAST  org/objectweb/asm/Opcodes::CHECKCAST]
    [ANEWARRAY  org/objectweb/asm/Opcodes::ANEWARRAY]]]

  [Class
   [[NEW        org/objectweb/asm/Opcodes::NEW]
    [INSTANCEOF org/objectweb/asm/Opcodes::INSTANCEOF]]]
  )

(def: .public (NEWARRAY type)
  (-> (Type Primitive) Inst)
  (function (_ visitor)
    (do_to visitor
      (org/objectweb/asm/MethodVisitor::visitIntInsn (org/objectweb/asm/Opcodes::NEWARRAY)
                                                     (`` (cond (~~ (template [<descriptor> <opcode>]
                                                                     [(type@= <descriptor> type) (<opcode>)]
                                                                     
                                                                     [type.boolean org/objectweb/asm/Opcodes::T_BOOLEAN]
                                                                     [type.byte    org/objectweb/asm/Opcodes::T_BYTE]
                                                                     [type.short   org/objectweb/asm/Opcodes::T_SHORT]
                                                                     [type.int     org/objectweb/asm/Opcodes::T_INT]
                                                                     [type.long    org/objectweb/asm/Opcodes::T_LONG]
                                                                     [type.float   org/objectweb/asm/Opcodes::T_FLOAT]
                                                                     [type.double  org/objectweb/asm/Opcodes::T_DOUBLE]
                                                                     [type.char    org/objectweb/asm/Opcodes::T_CHAR]))
                                                               ... else
                                                               (undefined)))))))

(template [<name> <inst> <interface?>]
  [(def: .public (<name> class method_name method)
     (-> (Type Class) Text (Type Method) Inst)
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitMethodInsn (<inst>)
                                                           (..class_name class)
                                                           method_name
                                                           (|> method type.descriptor descriptor.descriptor)
                                                           <interface?>))))]

  [INVOKESTATIC    org/objectweb/asm/Opcodes::INVOKESTATIC false]
  [INVOKEVIRTUAL   org/objectweb/asm/Opcodes::INVOKEVIRTUAL false]
  [INVOKESPECIAL   org/objectweb/asm/Opcodes::INVOKESPECIAL false]
  [INVOKEINTERFACE org/objectweb/asm/Opcodes::INVOKEINTERFACE true]
  )

(template [<name>]
  [(def: .public (<name> @where)
     (-> //.Label Inst)
     (function (_ visitor)
       (do_to visitor
         (org/objectweb/asm/MethodVisitor::visitJumpInsn (!prefix <name>) @where))))]

  [IF_ICMPEQ] [IF_ICMPGT] [IF_ICMPLT]
  [IF_ICMPNE] [IF_ICMPGE] [IF_ICMPLE]
  [IF_ACMPEQ] [IF_ACMPNE] [IFNULL] [IFNONNULL]
  [IFEQ] [IFNE] [IFLT] [IFLE] [IFGT] [IFGE]
  [GOTO]
  )

(def: .public (LOOKUPSWITCH default keys+labels)
  (-> //.Label (List [Int //.Label]) Inst)
  (function (_ visitor)
    (let [keys+labels (list.sorted (function (_ left right)
                                     (i.< (product.left left) (product.left right)))
                                   keys+labels)
          array_size (list.size keys+labels)
          keys_array (ffi.array int array_size)
          labels_array (ffi.array org/objectweb/asm/Label array_size)
          _ (loop [idx 0]
              (if (n.< array_size idx)
                (let [[key label] (maybe.trusted (list.item idx keys+labels))]
                  (exec
                    (ffi.write! idx (ffi.long_to_int key) keys_array)
                    (ffi.write! idx label labels_array)
                    (recur (++ idx))))
                []))]
      (do_to visitor
        (org/objectweb/asm/MethodVisitor::visitLookupSwitchInsn default keys_array labels_array)))))

(def: .public (TABLESWITCH min max default labels)
  (-> Int Int //.Label (List //.Label) Inst)
  (function (_ visitor)
    (let [num_labels (list.size labels)
          labels_array (ffi.array org/objectweb/asm/Label num_labels)
          _ (loop [idx 0]
              (if (n.< num_labels idx)
                (exec (ffi.write! idx
                                  (maybe.trusted (list.item idx labels))
                                  labels_array)
                  (recur (++ idx)))
                []))]
      (do_to visitor
        (org/objectweb/asm/MethodVisitor::visitTableSwitchInsn min max default labels_array)))))

(def: .public (try @from @to @handler exception)
  (-> //.Label //.Label //.Label (Type Class) Inst)
  (function (_ visitor)
    (do_to visitor
      (org/objectweb/asm/MethodVisitor::visitTryCatchBlock @from @to @handler (..class_name exception)))))

(def: .public (label @label)
  (-> //.Label Inst)
  (function (_ visitor)
    (do_to visitor
      (org/objectweb/asm/MethodVisitor::visitLabel @label))))

(def: .public (array elementT)
  (-> (Type Value) Inst)
  (case (type.primitive? elementT)
    (#.Left elementT)
    (ANEWARRAY elementT)

    (#.Right elementT)
    (NEWARRAY elementT)))

(template [<name> <boolean> <byte> <short> <int> <long> <float> <double> <char>]
  [(def: (<name> type)
     (-> (Type Primitive) Text)
     (`` (cond (~~ (template [<descriptor> <output>]
                     [(type@= <descriptor> type) <output>]
                     
                     [type.boolean <boolean>]
                     [type.byte    <byte>]
                     [type.short   <short>]
                     [type.int     <int>]
                     [type.long    <long>]
                     [type.float   <float>]
                     [type.double  <double>]
                     [type.char    <char>]))
               ... else
               (undefined))))]

  [primitive_wrapper
   box.boolean box.byte box.short box.int
   box.long box.float box.double box.char]
  [primitive_unwrap
   "booleanValue" "byteValue" "shortValue" "intValue"
   "longValue" "floatValue" "doubleValue" "charValue"]
  )

(def: .public (wrap type)
  (-> (Type Primitive) Inst)
  (let [wrapper (type.class (primitive_wrapper type) (list))]
    (INVOKESTATIC wrapper "valueOf" (type.method [(list) (list type) wrapper (list)]))))

(def: .public (unwrap type)
  (-> (Type Primitive) Inst)
  (let [wrapper (type.class (primitive_wrapper type) (list))]
    (|>> (CHECKCAST wrapper)
         (INVOKEVIRTUAL wrapper (primitive_unwrap type) (type.method [(list) (list) type (list)])))))

(def: .public (fuse insts)
  (-> (List Inst) Inst)
  (case insts
    #.End
    function.identity

    (#.Item singleton #.End)
    singleton

    (#.Item head tail)
    (function.composite (fuse tail) head)))