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import IECore
import IECoreScene

import Gaffer
import GafferScene

def __compatibilityFunc( node, oldParent ):
	parentNode = node.ancestor( Gaffer.Node )
	gafferVersion = None
	while parentNode :
		gafferVersion = (
			Gaffer.Metadata.value( parentNode, "serialiser:milestoneVersion" ),
			Gaffer.Metadata.value( parentNode, "serialiser:majorVersion" ),
			Gaffer.Metadata.value( parentNode, "serialiser:minorVersion" ),
			Gaffer.Metadata.value( parentNode, "serialiser:patchVersion" )
		)

		# only use the information if we have valid information from the node
		if not filter( lambda x : x is None, gafferVersion ) :
			break

		gafferVersion = None
		parentNode = parentNode.ancestor( Gaffer.Node )

	if gafferVersion is not None and gafferVersion < ( 0, 52, 0, 0 ) :
		# The old Gaffer implicitly used a film fit of "Fit".  This was usually undesirable
		# ( It resulted in usually getting a vertical fit, whereas artists expect horizontal ),
		# but for compatibility's sake we set up old cameras so that they will continue to do this

		node["renderSettingOverrides"]["filmFit"]["enabled"].setValue( True )
		node["renderSettingOverrides"]["filmFit"]["value"].setValue( IECoreScene.Camera.FilmFit.Fit )

def __initWrapper( originalInit, defaultName ):

	def init( self, name = defaultName ):
		originalInit( self, name )
		self.__compatibilityCallback = self.parentChangedSignal().connect( __compatibilityFunc, scoped = True )

	return init

GafferScene.Camera.__init__ = __initWrapper( GafferScene.Camera.__init__, "Camera" )

