{-# LANGUAGE TemplateHaskell #-}
module STD.VectorIterator.TH where
import Data.Char
import Data.List
import Data.Monoid
import Foreign.C.Types
import Foreign.Ptr
import Language.Haskell.TH
import Language.Haskell.TH.Syntax
import FFICXX.Runtime.CodeGen.Cxx
import FFICXX.Runtime.TH
import STD.VectorIterator.Template

t_deRef :: Type -> String -> Q Exp
t_deRef typ1 suffix
  = mkTFunc (typ1, suffix, \ n -> "VectorIterator_deRef" <> n, tyf)
  where tyf _
          = let tp1 = pure typ1 in
              [t| VectorIterator $( tp1 ) -> IO $( tp1 ) |]

t_increment :: Type -> String -> Q Exp
t_increment typ1 suffix
  = mkTFunc
      (typ1, suffix, \ n -> "VectorIterator_increment" <> n, tyf)
  where tyf _
          = let tp1 = pure typ1 in
              [t| VectorIterator $( tp1 ) -> IO (VectorIterator $( tp1 )) |]

genVectorIteratorInstanceFor ::
                             IsCPrimitive -> (Q Type, TemplateParamInfo) -> Q [Dec]
genVectorIteratorInstanceFor isCprim (qtyp1, param1)
  = do let params = map tpinfoSuffix [param1]
       let suffix = concatMap (\ x -> "_" ++ tpinfoSuffix x) [param1]
       callmod_ <- fmap loc_module location
       let callmod = dot2_ callmod_
       typ1 <- qtyp1
       f1 <- mkMember "deRef" t_deRef typ1 suffix
       f2 <- mkMember "increment" t_increment typ1 suffix
       addModFinalizer
         (addForeignSource LangCxx
            ("\n#include \"MacroPatternMatch.h\"\n\n\n#include \"vector\"\n\n\n#define VectorIterator_deRef(callmod, tp1) \\\nextern \"C\" {\\\ntp1##_p VectorIterator_deRef_##tp1 ( void* p );}\\\ninline tp1##_p VectorIterator_deRef_##tp1 ( void* p ) {\\\nreturn from_nonconst_to_nonconst<tp1##_t, tp1>((tp1*)&((static_cast<std::vector<tp1>::iterator*>(p))->operator*()));\\\n}\\\nauto a_##callmod##_VectorIterator_deRef_##tp1=VectorIterator_deRef_##tp1;\n\n\n#define VectorIterator_increment(callmod, tp1) \\\nextern \"C\" {\\\nvoid* VectorIterator_increment_##tp1 ( void* p );}\\\ninline void* VectorIterator_increment_##tp1 ( void* p ) {\\\nstd::vector<tp1>::iterator* r=new std::vector<tp1>::iterator((static_cast<std::vector<tp1>::iterator*>(p))->operator++());return static_cast<void*>(r);\\\n}\\\nauto a_##callmod##_VectorIterator_increment_##tp1=VectorIterator_increment_##tp1;\n\n\n#define VectorIterator_deRef_s(callmod, tp1) \\\nextern \"C\" {\\\ntp1 VectorIterator_deRef_##tp1 ( void* p );}\\\ninline tp1 VectorIterator_deRef_##tp1 ( void* p ) {\\\nreturn (static_cast<std::vector<tp1>::iterator*>(p))->operator*();\\\n}\\\nauto a_##callmod##_VectorIterator_deRef_##tp1=VectorIterator_deRef_##tp1;\n\n\n#define VectorIterator_increment_s(callmod, tp1) \\\nextern \"C\" {\\\nvoid* VectorIterator_increment_##tp1 ( void* p );}\\\ninline void* VectorIterator_increment_##tp1 ( void* p ) {\\\nstd::vector<tp1>::iterator* r=new std::vector<tp1>::iterator((static_cast<std::vector<tp1>::iterator*>(p))->operator++());return static_cast<void*>(r);\\\n}\\\nauto a_##callmod##_VectorIterator_increment_##tp1=VectorIterator_increment_##tp1;\n\n\n#define VectorIterator_instance(callmod, tp1) \\\nVectorIterator_deRef(callmod, tp1)\\\nVectorIterator_increment(callmod, tp1)\n\n\n#define VectorIterator_instance_s(callmod, tp1) \\\nVectorIterator_deRef_s(callmod, tp1)\\\nVectorIterator_increment_s(callmod, tp1)\n\n"
               ++
               let headers = concatMap tpinfoCxxHeaders [param1]
                   f x = renderCMacro (Include x)
                 in concatMap f headers
                 ++
                 let nss = concatMap tpinfoCxxNamespaces [param1]
                     f x = renderCStmt (UsingNamespace x)
                   in concatMap f nss
                   ++
                   "VectorIterator_instance" ++
                     (case isCprim of
                          CPrim -> "_s"
                          NonCPrim -> "")
                       ++ "(" ++ intercalate ", " (callmod : params) ++ ")\n"))
       let lst = [f1, f2]
       pure [mkInstance [] (AppT (con "IVectorIterator") typ1) lst]