{-# LANGUAGE TypeApplications, TypeSynonymInstances, MultiParamTypeClasses, FlexibleInstances #-}

module Clr.Bindings.Box where

import Clr
import Clr.Marshal

import Clr.Host.BStr

import Clr.Marshal.Host
import Clr.Bindings.BStr

import Data.Int
import Data.Text
import Data.Text.Foreign
import Data.Word
import Foreign.Marshal.Alloc
import Foreign.Ptr
import Foreign.Storable


-- | @'getBoxStub' t@ returns a function pointer to a function that, when
--   called, returns a boxed object reference to the given type.
getBoxStub :: String -> IO (FunPtr f)
getBoxStub typeName = marshal typeName $ \typeName'-> do
  stub <- getBoxStubRaw
  return $ stub typeName'

getBoxStubRaw :: IO (GetBoxStubDelegate a)
getBoxStubRaw = unsafeGetPointerToMethod "GetBoxStub" >>= return . makeGetBoxStubDelegate

type GetBoxStubDelegate a = BStr -> FunPtr a
foreign import ccall "dynamic" makeGetBoxStubDelegate :: FunPtr (GetBoxStubDelegate a) -> GetBoxStubDelegate a

--
-- Text
--

instance Marshal Text (ObjectID obj) where
  marshal x f = marshal @Text @BStr x $ \ptr-> do
    stub <- boxStringStub
    obj <- stub ptr
    f obj

type BoxStringStub a = BStr -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxStringStub :: FunPtr (BoxStringStub a) -> (BoxStringStub a)

boxStringStub :: IO (BoxStringStub a)
boxStringStub = getBoxStub "System.String" >>= return . makeBoxStringStub

--
-- String
--

instance Marshal String (ObjectID a) where
  marshal x f = marshal (pack x) f

--
-- Int8
--

instance Marshal Int8 (ObjectID obj) where
  marshal x f = boxInt8Stub >>= \stub-> stub x >>= f

type BoxInt8Stub a = Int8 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxInt8Stub :: FunPtr (BoxInt8Stub a) -> (BoxInt8Stub a)

boxInt8Stub :: IO (BoxInt8Stub a)
boxInt8Stub = getBoxStub "System.SByte" >>= return . makeBoxInt8Stub

--
-- Word8
--

instance Marshal Word8 (ObjectID obj) where
  marshal x f = boxWord8Stub >>= \stub-> stub x >>= f

type BoxWord8Stub a = Word8 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxWord8Stub :: FunPtr (BoxWord8Stub a) -> (BoxWord8Stub a)

boxWord8Stub :: IO (BoxWord8Stub a)
boxWord8Stub = getBoxStub "System.Byte" >>= return . makeBoxWord8Stub

--
-- Int16
--

instance Marshal Int16 (ObjectID obj) where
  marshal x f = boxInt16Stub >>= \stub-> stub x >>= f

type BoxInt16Stub a = Int16 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxInt16Stub :: FunPtr (BoxInt16Stub a) -> (BoxInt16Stub a)

boxInt16Stub :: IO (BoxInt16Stub a)
boxInt16Stub = getBoxStub "System.Int16" >>= return . makeBoxInt16Stub

--
-- Word16
--

instance Marshal Word16 (ObjectID obj) where
  marshal x f = boxWord16Stub >>= \stub-> stub x >>= f

type BoxWord16Stub a = Word16 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxWord16Stub :: FunPtr (BoxWord16Stub a) -> (BoxWord16Stub a)

boxWord16Stub :: IO (BoxWord16Stub a)
boxWord16Stub = getBoxStub "System.UInt16" >>= return . makeBoxWord16Stub

--
-- Int32
--

instance Marshal Int32 (ObjectID obj) where
  marshal x f = boxInt32Stub >>= \stub-> stub x >>= f

type BoxInt32Stub a = Int32 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxInt32Stub :: FunPtr (BoxInt32Stub a) -> (BoxInt32Stub a)

boxInt32Stub :: IO (BoxInt32Stub a)
boxInt32Stub = getBoxStub "System.Int32" >>= return . makeBoxInt32Stub

--
-- Word32
--

instance Marshal Word32 (ObjectID obj) where
  marshal x f = boxWord32Stub >>= \stub-> stub x >>= f

type BoxWord32Stub a = Word32 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxWord32Stub :: FunPtr (BoxWord32Stub a) -> (BoxWord32Stub a)

boxWord32Stub :: IO (BoxWord32Stub a)
boxWord32Stub = getBoxStub "System.UInt32" >>= return . makeBoxWord32Stub

--
-- Int64
--

instance Marshal Int64 (ObjectID obj) where
  marshal x f = boxInt64Stub >>= \stub-> stub x >>= f

type BoxInt64Stub a = Int64 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxInt64Stub :: FunPtr (BoxInt64Stub a) -> (BoxInt64Stub a)

boxInt64Stub :: IO (BoxInt64Stub a)
boxInt64Stub = getBoxStub "System.Int64" >>= return . makeBoxInt64Stub

--
-- Word64
--

instance Marshal Word64 (ObjectID obj) where
  marshal x f = boxWord64Stub >>= \stub-> stub x >>= f

type BoxWord64Stub a = Word64 -> IO (ObjectID a)
foreign import ccall "dynamic" makeBoxWord64Stub :: FunPtr (BoxWord64Stub a) -> (BoxWord64Stub a)

boxWord64Stub :: IO (BoxWord64Stub a)
boxWord64Stub = getBoxStub "System.UInt64" >>= return . makeBoxWord64Stub