{-# LANGUAGE ForeignFunctionInterface #-}

-- |
-- Module     : Mac.Carbon
-- Maintainer : Yakov Z <>
-- Stability  : experimental
--
 
module Mac.Carbon (
  OSType,

  -- * Error Handler
  OSErr,
  OSStatus,

  -- * Window Manager
  WindowClass,
  WindowAttributes,
  Rect(..),
  WindowRef,
  CGrafPtr,

  kDocumentWindowClass,
  kWindowNoAttributes,
  
  -- ** Creating, Storing, and Closing Windows
  createNewWindow,

  -- ** Displaying Windows
  showWindow,

  -- ** Getting and Setting Window Structure Fields
  getWindowPort,

  -- * Component Manager

  -- ** Opening and Closing Components
  openDefaultComponent,

  -- * Memory Manager
  Handle,
  Size,

  -- ** Allocating and Releasing Relocatable Blocks of Memory
  disposeHandle,
  newHandle,
  

  TimeValue,

  Boolean,
  true,
  false,

  button
                  ) where

import Foreign.Ptr
import Foreign.C.Types
import Foreign.Storable

#include <Carbon/Carbon.h>

-- | A numeric code used in Carbon to idndicate the return status of a function.
--
--  Declared in IOMacOSTypes.h
type OSErr = CShort

-- | A numeric code used in Carbon to indicate the return status of a function.
--
--  Declared in OSTypes.h
type OSStatus = CInt

type WindowClass = CInt
kDocumentWindowClass :: WindowClass
kDocumentWindowClass = (#const kDocumentWindowClass)

type WindowAttributes = CInt
kWindowNoAttributes :: WindowAttributes
kWindowNoAttributes = (#const kWindowNoAttributes)

data Rect = Rect { top :: CShort,
                   left :: CShort,
                   bottom :: CShort,
                   right :: CShort }
instance Storable Rect where
    sizeOf _ = #const sizeof(Rect)
    alignment _ = alignment (undefined :: CInt) -- ???
    peek _ = error "Storable.peek(MacTypes.Rect) not implemented"
    poke p (Rect top' left' bottom' right') 
        = do (#poke Rect, top) p top'
             (#poke Rect, left) p left'
             (#poke Rect, bottom) p bottom'
             (#poke Rect, right) p right'

type CGrafPtr = Ptr ()

type WindowRef = Ptr ()

type OSType = CLong

-- | 
type Handle = Ptr ()

type Size = CLong

type Boolean = CInt

type TimeValue = CInt


true, false :: Boolean
true = #const true
false = #const false


-- | Creates a window from parameter data.
foreign import ccall unsafe "CreateNewWindow" createNewWindow :: WindowClass -> WindowAttributes -> {- const -} Ptr (Rect) -> Ptr (WindowRef) -> IO OSStatus

-- | Make an invisible window visible.
foreign import ccall unsafe "ShowWindow" showWindow :: WindowRef -> IO ()

foreign import ccall unsafe "GetWindowPort" getWindowPort :: WindowRef -> IO CGrafPtr


-- | Opens a connection to a registered component of the component type and subtype specified by your application.
foreign import ccall unsafe "OpenDefaultComponent" openDefaultComponent :: OSType -> OSType -> IO (Ptr a)


-- | Allocates a new relocatable memory block of a specified size in the current heap zone.
foreign import ccall unsafe "NewHandle" newHandle :: Size -> IO Handle

-- | Releases memory occupied by a relocatable block.
foreign import ccall unsafe "DisposeHandle" disposeHandle :: Handle -> IO ()


-- | 
foreign import ccall unsafe "Button" button :: IO Boolean