{- |
Copyright  : Will Thompson, Iñaki García Etxebarria and Jonas Platte
License    : LGPL-2.1
Maintainer : Iñaki García Etxebarria (garetxe@gmail.com)

A GHashTableIter structure represents an iterator that can be used
to iterate over the elements of a 'GI.GLib.Structs.HashTable.HashTable'. GHashTableIter
structures are typically allocated on the stack and then initialized
with 'GI.GLib.Structs.HashTableIter.hashTableIterInit'.
-}

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

module GI.GLib.Structs.HashTableIter
    (

-- * Exported types
    HashTableIter(..)                       ,
    newZeroHashTableIter                    ,
    noHashTableIter                         ,


 -- * Methods
-- ** init #method:init#

#if ENABLE_OVERLOADING
    HashTableIterInitMethodInfo             ,
#endif
    hashTableIterInit                       ,


-- ** next #method:next#

#if ENABLE_OVERLOADING
    HashTableIterNextMethodInfo             ,
#endif
    hashTableIterNext                       ,


-- ** remove #method:remove#

#if ENABLE_OVERLOADING
    HashTableIterRemoveMethodInfo           ,
#endif
    hashTableIterRemove                     ,


-- ** replace #method:replace#

#if ENABLE_OVERLOADING
    HashTableIterReplaceMethodInfo          ,
#endif
    hashTableIterReplace                    ,


-- ** steal #method:steal#

#if ENABLE_OVERLOADING
    HashTableIterStealMethodInfo            ,
#endif
    hashTableIterSteal                      ,




    ) 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.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.Text as T
import qualified Data.ByteString.Char8 as B
import qualified Data.Map as Map
import qualified Foreign.Ptr as FP


-- | Memory-managed wrapper type.
newtype HashTableIter = HashTableIter (ManagedPtr HashTableIter)
instance WrappedPtr HashTableIter where
    wrappedPtrCalloc = callocBytes 40
    wrappedPtrCopy = \p -> withManagedPtr p (copyBytes 40 >=> wrapPtr HashTableIter)
    wrappedPtrFree = Just ptr_to_g_free

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

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


-- | A convenience alias for `Nothing` :: `Maybe` `HashTableIter`.
noHashTableIter :: Maybe HashTableIter
noHashTableIter = Nothing


#if ENABLE_OVERLOADING
instance O.HasAttributeList HashTableIter
type instance O.AttributeList HashTableIter = HashTableIterAttributeList
type HashTableIterAttributeList = ('[ ] :: [(Symbol, *)])
#endif

-- method HashTableIter::init
-- method type : OrdinaryMethod
-- Args : [Arg {argCName = "iter", argType = TInterface (Name {namespace = "GLib", name = "HashTableIter"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "an uninitialized #GHashTableIter", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "hash_table", argType = TGHash (TBasicType TPtr) (TBasicType TPtr), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GHashTable", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}]
-- Lengths : []
-- returnType : Nothing
-- throws : False
-- Skip return : False

foreign import ccall "g_hash_table_iter_init" g_hash_table_iter_init ::
    Ptr HashTableIter ->                    -- iter : TInterface (Name {namespace = "GLib", name = "HashTableIter"})
    Ptr (GHashTable (Ptr ()) (Ptr ())) ->   -- hash_table : TGHash (TBasicType TPtr) (TBasicType TPtr)
    IO ()

{- |
Initializes a key\/value pair iterator and associates it with
/@hashTable@/. Modifying the hash table after calling this function
invalidates the returned iterator.

=== /C code/
>
>GHashTableIter iter;
>gpointer key, value;
>
>g_hash_table_iter_init (&iter, hash_table);
>while (g_hash_table_iter_next (&iter, &key, &value))
>  {
>    // do something with key and value
>  }


/Since: 2.16/
-}
hashTableIterInit ::
    (B.CallStack.HasCallStack, MonadIO m) =>
    HashTableIter
    {- ^ /@iter@/: an uninitialized 'GI.GLib.Structs.HashTableIter.HashTableIter' -}
    -> Map.Map (Ptr ()) (Ptr ())
    {- ^ /@hashTable@/: a 'GI.GLib.Structs.HashTable.HashTable' -}
    -> m ()
hashTableIterInit iter hashTable = liftIO $ do
    iter' <- unsafeManagedPtrGetPtr iter
    let hashTable' = Map.toList hashTable
    let hashTable'' = mapFirst ptrPackPtr hashTable'
    let hashTable''' = mapSecond ptrPackPtr hashTable''
    hashTable'''' <- packGHashTable gDirectHash gDirectEqual Nothing Nothing hashTable'''
    g_hash_table_iter_init iter' hashTable''''
    touchManagedPtr iter
    unrefGHashTable hashTable''''
    return ()

#if ENABLE_OVERLOADING
data HashTableIterInitMethodInfo
instance (signature ~ (Map.Map (Ptr ()) (Ptr ()) -> m ()), MonadIO m) => O.MethodInfo HashTableIterInitMethodInfo HashTableIter signature where
    overloadedMethod _ = hashTableIterInit

#endif

-- method HashTableIter::next
-- method type : OrdinaryMethod
-- Args : [Arg {argCName = "iter", argType = TInterface (Name {namespace = "GLib", name = "HashTableIter"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "an initialized #GHashTableIter", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "key", argType = TBasicType TPtr, direction = DirectionOut, mayBeNull = True, argDoc = Documentation {rawDocText = Just "a location to store the key", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferEverything},Arg {argCName = "value", argType = TBasicType TPtr, direction = DirectionOut, mayBeNull = True, argDoc = Documentation {rawDocText = Just "a location to store the value", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferEverything}]
-- Lengths : []
-- returnType : Just (TBasicType TBoolean)
-- throws : False
-- Skip return : False

foreign import ccall "g_hash_table_iter_next" g_hash_table_iter_next ::
    Ptr HashTableIter ->                    -- iter : TInterface (Name {namespace = "GLib", name = "HashTableIter"})
    Ptr (Ptr ()) ->                         -- key : TBasicType TPtr
    Ptr (Ptr ()) ->                         -- value : TBasicType TPtr
    IO CInt

{- |
Advances /@iter@/ and retrieves the key and\/or value that are now
pointed to as a result of this advancement. If 'False' is returned,
/@key@/ and /@value@/ are not set, and the iterator becomes invalid.

/Since: 2.16/
-}
hashTableIterNext ::
    (B.CallStack.HasCallStack, MonadIO m) =>
    HashTableIter
    {- ^ /@iter@/: an initialized 'GI.GLib.Structs.HashTableIter.HashTableIter' -}
    -> m ((Bool, Ptr (), Ptr ()))
    {- ^ __Returns:__ 'False' if the end of the 'GI.GLib.Structs.HashTable.HashTable' has been reached. -}
hashTableIterNext iter = liftIO $ do
    iter' <- unsafeManagedPtrGetPtr iter
    key <- allocMem :: IO (Ptr (Ptr ()))
    value <- allocMem :: IO (Ptr (Ptr ()))
    result <- g_hash_table_iter_next iter' key value
    let result' = (/= 0) result
    key' <- peek key
    value' <- peek value
    touchManagedPtr iter
    freeMem key
    freeMem value
    return (result', key', value')

#if ENABLE_OVERLOADING
data HashTableIterNextMethodInfo
instance (signature ~ (m ((Bool, Ptr (), Ptr ()))), MonadIO m) => O.MethodInfo HashTableIterNextMethodInfo HashTableIter signature where
    overloadedMethod _ = hashTableIterNext

#endif

-- method HashTableIter::remove
-- method type : OrdinaryMethod
-- Args : [Arg {argCName = "iter", argType = TInterface (Name {namespace = "GLib", name = "HashTableIter"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "an initialized #GHashTableIter", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}]
-- Lengths : []
-- returnType : Nothing
-- throws : False
-- Skip return : False

foreign import ccall "g_hash_table_iter_remove" g_hash_table_iter_remove ::
    Ptr HashTableIter ->                    -- iter : TInterface (Name {namespace = "GLib", name = "HashTableIter"})
    IO ()

{- |
Removes the key\/value pair currently pointed to by the iterator
from its associated 'GI.GLib.Structs.HashTable.HashTable'. Can only be called after
'GI.GLib.Structs.HashTableIter.hashTableIterNext' returned 'True', and cannot be called
more than once for the same key\/value pair.

If the 'GI.GLib.Structs.HashTable.HashTable' was created using @/g_hash_table_new_full()/@,
the key and value are freed using the supplied destroy functions,
otherwise you have to make sure that any dynamically allocated
values are freed yourself.

It is safe to continue iterating the 'GI.GLib.Structs.HashTable.HashTable' afterward:

=== /C code/
>
>while (g_hash_table_iter_next (&iter, &key, &value))
>  {
>    if (condition)
>      g_hash_table_iter_remove (&iter);
>  }


/Since: 2.16/
-}
hashTableIterRemove ::
    (B.CallStack.HasCallStack, MonadIO m) =>
    HashTableIter
    {- ^ /@iter@/: an initialized 'GI.GLib.Structs.HashTableIter.HashTableIter' -}
    -> m ()
hashTableIterRemove iter = liftIO $ do
    iter' <- unsafeManagedPtrGetPtr iter
    g_hash_table_iter_remove iter'
    touchManagedPtr iter
    return ()

#if ENABLE_OVERLOADING
data HashTableIterRemoveMethodInfo
instance (signature ~ (m ()), MonadIO m) => O.MethodInfo HashTableIterRemoveMethodInfo HashTableIter signature where
    overloadedMethod _ = hashTableIterRemove

#endif

-- method HashTableIter::replace
-- method type : OrdinaryMethod
-- Args : [Arg {argCName = "iter", argType = TInterface (Name {namespace = "GLib", name = "HashTableIter"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "an initialized #GHashTableIter", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "value", argType = TBasicType TPtr, direction = DirectionIn, mayBeNull = True, argDoc = Documentation {rawDocText = Just "the value to replace with", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}]
-- Lengths : []
-- returnType : Nothing
-- throws : False
-- Skip return : False

foreign import ccall "g_hash_table_iter_replace" g_hash_table_iter_replace ::
    Ptr HashTableIter ->                    -- iter : TInterface (Name {namespace = "GLib", name = "HashTableIter"})
    Ptr () ->                               -- value : TBasicType TPtr
    IO ()

{- |
Replaces the value currently pointed to by the iterator
from its associated 'GI.GLib.Structs.HashTable.HashTable'. Can only be called after
'GI.GLib.Structs.HashTableIter.hashTableIterNext' returned 'True'.

If you supplied a /@valueDestroyFunc@/ when creating the
'GI.GLib.Structs.HashTable.HashTable', the old value is freed using that function.

/Since: 2.30/
-}
hashTableIterReplace ::
    (B.CallStack.HasCallStack, MonadIO m) =>
    HashTableIter
    {- ^ /@iter@/: an initialized 'GI.GLib.Structs.HashTableIter.HashTableIter' -}
    -> Ptr ()
    {- ^ /@value@/: the value to replace with -}
    -> m ()
hashTableIterReplace iter value = liftIO $ do
    iter' <- unsafeManagedPtrGetPtr iter
    g_hash_table_iter_replace iter' value
    touchManagedPtr iter
    return ()

#if ENABLE_OVERLOADING
data HashTableIterReplaceMethodInfo
instance (signature ~ (Ptr () -> m ()), MonadIO m) => O.MethodInfo HashTableIterReplaceMethodInfo HashTableIter signature where
    overloadedMethod _ = hashTableIterReplace

#endif

-- method HashTableIter::steal
-- method type : OrdinaryMethod
-- Args : [Arg {argCName = "iter", argType = TInterface (Name {namespace = "GLib", name = "HashTableIter"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "an initialized #GHashTableIter", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}]
-- Lengths : []
-- returnType : Nothing
-- throws : False
-- Skip return : False

foreign import ccall "g_hash_table_iter_steal" g_hash_table_iter_steal ::
    Ptr HashTableIter ->                    -- iter : TInterface (Name {namespace = "GLib", name = "HashTableIter"})
    IO ()

{- |
Removes the key\/value pair currently pointed to by the
iterator from its associated 'GI.GLib.Structs.HashTable.HashTable', without calling
the key and value destroy functions. Can only be called
after 'GI.GLib.Structs.HashTableIter.hashTableIterNext' returned 'True', and cannot
be called more than once for the same key\/value pair.

/Since: 2.16/
-}
hashTableIterSteal ::
    (B.CallStack.HasCallStack, MonadIO m) =>
    HashTableIter
    {- ^ /@iter@/: an initialized 'GI.GLib.Structs.HashTableIter.HashTableIter' -}
    -> m ()
hashTableIterSteal iter = liftIO $ do
    iter' <- unsafeManagedPtrGetPtr iter
    g_hash_table_iter_steal iter'
    touchManagedPtr iter
    return ()

#if ENABLE_OVERLOADING
data HashTableIterStealMethodInfo
instance (signature ~ (m ()), MonadIO m) => O.MethodInfo HashTableIterStealMethodInfo HashTableIter signature where
    overloadedMethod _ = hashTableIterSteal

#endif

#if ENABLE_OVERLOADING
type family ResolveHashTableIterMethod (t :: Symbol) (o :: *) :: * where
    ResolveHashTableIterMethod "init" o = HashTableIterInitMethodInfo
    ResolveHashTableIterMethod "next" o = HashTableIterNextMethodInfo
    ResolveHashTableIterMethod "remove" o = HashTableIterRemoveMethodInfo
    ResolveHashTableIterMethod "replace" o = HashTableIterReplaceMethodInfo
    ResolveHashTableIterMethod "steal" o = HashTableIterStealMethodInfo
    ResolveHashTableIterMethod l o = O.MethodResolutionFailed l o

instance (info ~ ResolveHashTableIterMethod t HashTableIter, O.MethodInfo info HashTableIter p) => O.IsLabelProxy t (HashTableIter -> p) where
    fromLabelProxy _ = O.overloadedMethod (O.MethodProxy :: O.MethodProxy info)

#if MIN_VERSION_base(4,9,0)
instance (info ~ ResolveHashTableIterMethod t HashTableIter, O.MethodInfo info HashTableIter p) => O.IsLabel t (HashTableIter -> 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

#endif