{- |
Copyright  : Will Thompson, Iñaki García Etxebarria and Jonas Platte
License    : LGPL-2.1
Maintainer : Iñaki García Etxebarria (inaki@blueleaf.cc)

Structure used for scatter\/gather data output.
You generally pass in an array of @/GOutputVectors/@
and the operation will use all the buffers as if they were
one buffer.

/Since: 2.22/
-}

#define ENABLE_OVERLOADING (MIN_VERSION_haskell_gi_overloading(1,0,0) \
       && !defined(__HADDOCK_VERSION__))

module GI.Gio.Structs.OutputVector
    ( 

-- * Exported types
    OutputVector(..)                        ,
    newZeroOutputVector                     ,
    noOutputVector                          ,


 -- * Properties
-- ** buffer #attr:buffer#
{- | Pointer to a buffer of data to read.
-}
    clearOutputVectorBuffer                 ,
    getOutputVectorBuffer                   ,
#if ENABLE_OVERLOADING
    outputVector_buffer                     ,
#endif
    setOutputVectorBuffer                   ,


-- ** size #attr:size#
{- | the size of /@buffer@/.
-}
    getOutputVectorSize                     ,
#if ENABLE_OVERLOADING
    outputVector_size                       ,
#endif
    setOutputVectorSize                     ,




    ) where

import Data.GI.Base.ShortPrelude
import qualified Data.GI.Base.ShortPrelude as SP
import qualified Data.GI.Base.Overloading as O
import qualified Prelude as P

import qualified Data.GI.Base.Attributes as GI.Attributes
import qualified Data.GI.Base.ManagedPtr as B.ManagedPtr
import qualified Data.GI.Base.GClosure as B.GClosure
import qualified Data.GI.Base.GError as B.GError
import qualified Data.GI.Base.GVariant as B.GVariant
import qualified Data.GI.Base.GValue as B.GValue
import qualified Data.GI.Base.GParamSpec as B.GParamSpec
import qualified Data.GI.Base.CallStack as B.CallStack
import qualified Data.GI.Base.Properties as B.Properties
import qualified Data.Text as T
import qualified Data.ByteString.Char8 as B
import qualified Data.Map as Map
import qualified Foreign.Ptr as FP
import qualified GHC.OverloadedLabels as OL


-- | Memory-managed wrapper type.
newtype OutputVector = OutputVector (ManagedPtr OutputVector)
instance WrappedPtr OutputVector where
    wrappedPtrCalloc = callocBytes 16
    wrappedPtrCopy = \p -> withManagedPtr p (copyBytes 16 >=> wrapPtr OutputVector)
    wrappedPtrFree = Just ptr_to_g_free

-- | Construct a `OutputVector` struct initialized to zero.
newZeroOutputVector :: MonadIO m => m OutputVector
newZeroOutputVector = liftIO $ wrappedPtrCalloc >>= wrapPtr OutputVector

instance tag ~ 'AttrSet => Constructible OutputVector tag where
    new _ attrs = do
        o <- newZeroOutputVector
        GI.Attributes.set o attrs
        return o


-- | A convenience alias for `Nothing` :: `Maybe` `OutputVector`.
noOutputVector :: Maybe OutputVector
noOutputVector = Nothing

{- |
Get the value of the “@buffer@” field.
When <https://github.com/haskell-gi/haskell-gi/wiki/Overloading overloading> is enabled, this is equivalent to

@
'Data.GI.Base.Attributes.get' outputVector #buffer
@
-}
getOutputVectorBuffer :: MonadIO m => OutputVector -> m (Ptr ())
getOutputVectorBuffer s = liftIO $ withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO (Ptr ())
    return val

{- |
Set the value of the “@buffer@” field.
When <https://github.com/haskell-gi/haskell-gi/wiki/Overloading overloading> is enabled, this is equivalent to

@
'Data.GI.Base.Attributes.set' outputVector [ #buffer 'Data.GI.Base.Attributes.:=' value ]
@
-}
setOutputVectorBuffer :: MonadIO m => OutputVector -> Ptr () -> m ()
setOutputVectorBuffer s val = liftIO $ withManagedPtr s $ \ptr -> do
    poke (ptr `plusPtr` 0) (val :: Ptr ())

{- |
Set the value of the “@buffer@” field to `Nothing`.
When <https://github.com/haskell-gi/haskell-gi/wiki/Overloading overloading> is enabled, this is equivalent to

@
'Data.GI.Base.Attributes.clear' #buffer
@
-}
clearOutputVectorBuffer :: MonadIO m => OutputVector -> m ()
clearOutputVectorBuffer s = liftIO $ withManagedPtr s $ \ptr -> do
    poke (ptr `plusPtr` 0) (FP.nullPtr :: Ptr ())

#if ENABLE_OVERLOADING
data OutputVectorBufferFieldInfo
instance AttrInfo OutputVectorBufferFieldInfo where
    type AttrAllowedOps OutputVectorBufferFieldInfo = '[ 'AttrSet, 'AttrGet, 'AttrClear]
    type AttrSetTypeConstraint OutputVectorBufferFieldInfo = (~) (Ptr ())
    type AttrBaseTypeConstraint OutputVectorBufferFieldInfo = (~) OutputVector
    type AttrGetType OutputVectorBufferFieldInfo = Ptr ()
    type AttrLabel OutputVectorBufferFieldInfo = "buffer"
    type AttrOrigin OutputVectorBufferFieldInfo = OutputVector
    attrGet _ = getOutputVectorBuffer
    attrSet _ = setOutputVectorBuffer
    attrConstruct = undefined
    attrClear _ = clearOutputVectorBuffer

outputVector_buffer :: AttrLabelProxy "buffer"
outputVector_buffer = AttrLabelProxy

#endif


{- |
Get the value of the “@size@” field.
When <https://github.com/haskell-gi/haskell-gi/wiki/Overloading overloading> is enabled, this is equivalent to

@
'Data.GI.Base.Attributes.get' outputVector #size
@
-}
getOutputVectorSize :: MonadIO m => OutputVector -> m Word64
getOutputVectorSize s = liftIO $ withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 8) :: IO Word64
    return val

{- |
Set the value of the “@size@” field.
When <https://github.com/haskell-gi/haskell-gi/wiki/Overloading overloading> is enabled, this is equivalent to

@
'Data.GI.Base.Attributes.set' outputVector [ #size 'Data.GI.Base.Attributes.:=' value ]
@
-}
setOutputVectorSize :: MonadIO m => OutputVector -> Word64 -> m ()
setOutputVectorSize s val = liftIO $ withManagedPtr s $ \ptr -> do
    poke (ptr `plusPtr` 8) (val :: Word64)

#if ENABLE_OVERLOADING
data OutputVectorSizeFieldInfo
instance AttrInfo OutputVectorSizeFieldInfo where
    type AttrAllowedOps OutputVectorSizeFieldInfo = '[ 'AttrSet, 'AttrGet]
    type AttrSetTypeConstraint OutputVectorSizeFieldInfo = (~) Word64
    type AttrBaseTypeConstraint OutputVectorSizeFieldInfo = (~) OutputVector
    type AttrGetType OutputVectorSizeFieldInfo = Word64
    type AttrLabel OutputVectorSizeFieldInfo = "size"
    type AttrOrigin OutputVectorSizeFieldInfo = OutputVector
    attrGet _ = getOutputVectorSize
    attrSet _ = setOutputVectorSize
    attrConstruct = undefined
    attrClear _ = undefined

outputVector_size :: AttrLabelProxy "size"
outputVector_size = AttrLabelProxy

#endif



#if ENABLE_OVERLOADING
instance O.HasAttributeList OutputVector
type instance O.AttributeList OutputVector = OutputVectorAttributeList
type OutputVectorAttributeList = ('[ '("buffer", OutputVectorBufferFieldInfo), '("size", OutputVectorSizeFieldInfo)] :: [(Symbol, *)])
#endif

#if ENABLE_OVERLOADING
type family ResolveOutputVectorMethod (t :: Symbol) (o :: *) :: * where
    ResolveOutputVectorMethod l o = O.MethodResolutionFailed l o

instance (info ~ ResolveOutputVectorMethod t OutputVector, O.MethodInfo info OutputVector p) => OL.IsLabel t (OutputVector -> p) where
#if MIN_VERSION_base(4,10,0)
    fromLabel = O.overloadedMethod (O.MethodProxy :: O.MethodProxy info)
#else
    fromLabel _ = O.overloadedMethod (O.MethodProxy :: O.MethodProxy info)
#endif

#endif