"""glu[Un]Project[4] convenience wrappers"""
from OpenGL.platform import GL
from OpenGL.raw import GLU as simple
from OpenGL import GL, arrays
from OpenGL.lazywrapper import lazy
import ctypes 
POINTER = ctypes.POINTER

@lazy( simple.gluProject )
def gluProject( baseFunction, objX, objY, objZ, model=None, proj=None, view=None ):
	"""Convenience wrapper for gluProject
	
	Automatically fills in the model, projection and viewing matrices
	if not provided.
	
	returns (winX,winY,winZ) doubles
	"""
	if model is None:
		model = GL.glGetDoublev( GL.GL_MODELVIEW_MATRIX )
	if proj is None:
		proj = GL.glGetDoublev( GL.GL_PROJECTION_MATRIX )
	if view is None:
		view = GL.glGetIntegerv( GL.GL_VIEWPORT )
	winX = simple.GLdouble( 0.0 )
	winY = simple.GLdouble( 0.0 )
	winZ = simple.GLdouble( 0.0 )
	result = baseFunction( 
		objX,objY,objZ,
		model,proj,view,
		winX,winY,winZ,
	)
	if not result:
		raise ValueError( """Projection failed!""" )
	return winX.value, winY.value, winZ.value 

@lazy( simple.gluUnProject )
def gluUnProject( baseFunction, winX, winY, winZ, model=None, proj=None, view=None ):
	"""Convenience wrapper for gluUnProject
	
	Automatically fills in the model, projection and viewing matrices
	if not provided.
	
	returns (objX,objY,objZ) doubles
	"""
	if model is None:
		model = GL.glGetDoublev( GL.GL_MODELVIEW_MATRIX )
	if proj is None:
		proj = GL.glGetDoublev( GL.GL_PROJECTION_MATRIX )
	if view is None:
		view = GL.glGetIntegerv( GL.GL_VIEWPORT )
	objX = simple.GLdouble( 0.0 )
	objY = simple.GLdouble( 0.0 )
	objZ = simple.GLdouble( 0.0 )
	result = baseFunction( 
		winX,winY,winZ,
		model,proj,view,
		ctypes.byref(objX),ctypes.byref(objY),ctypes.byref(objZ),
	)
	if not result:
		raise ValueError( """Projection failed!""" )
	return objX.value, objY.value, objZ.value 
@lazy( simple.gluUnProject4 )
def gluUnProject4(
	baseFunction,
	winX, winY, winZ, clipW, 
	model=None, proj=None, view=None, 
	near=0.0, far=1.0
):
	"""Convenience wrapper for gluUnProject
	
	Automatically fills in the model, projection and viewing matrices
	if not provided.
	
	returns (objX,objY,objZ) doubles
	"""
	if model is None:
		model = GL.glGetDoublev( GL.GL_MODELVIEW_MATRIX )
	if proj is None:
		proj = GL.glGetDoublev( GL.GL_PROJECTION_MATRIX )
	if view is None:
		view = GL.glGetIntegerv( GL.GL_VIEWPORT )
	objX = simple.GLdouble( 0.0 )
	objY = simple.GLdouble( 0.0 )
	objZ = simple.GLdouble( 0.0 )
	objW = simple.GLdouble( 0.0 )
	result = baseFunction( 
		winX,winY,winZ,
		model,proj,view,
		ctypes.byref(objX),ctypes.byref(objY),ctypes.byref(objZ),ctypes.byref(objW)
	)
	if not result:
		raise ValueError( """Projection failed!""" )
	return objX.value, objY.value, objZ.value, objW.value

__all__ = (
	'gluProject',
	'gluUnProject',
	'gluUnProject4',
)