##########################################################################
#
#  Copyright (c) 2012-2014, Image Engine Design Inc. All rights reserved.
#
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#  met:
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#      * Redistributions in binary form must reproduce the above
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#        the distribution.
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#        written permission.
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##########################################################################

import os

import IECore

import Gaffer
import GafferUI

class ImageReaderPathPreview( GafferUI.DeferredPathPreview ) :

	def __init__( self, path ) :

		self.__renderableGadget = GafferUI.RenderableGadget( None )
		self.__gadgetWidget = GafferUI.GadgetWidget(
			self.__renderableGadget,
			bufferOptions = set( (
				GafferUI.GLWidget.BufferOptions.Depth,
				GafferUI.GLWidget.BufferOptions.Double,
			) ),
		)

		GafferUI.DeferredPathPreview.__init__( self, self.__gadgetWidget, path )

		self._updateFromPath()

	def isValid( self ) :

		if not isinstance( self.getPath(), Gaffer.FileSystemPath ) :
			return False

		ext = os.path.splitext( str( self.getPath() ) )[1]
		if not ext :
			return False

		return ext[1:].lower() in IECore.Reader.supportedExtensions( IECore.TypeId.ImageReader )

	def _load( self ) :

		reader = None
		with IECore.IgnoredExceptions( RuntimeError ) :
			reader = IECore.ImageReader.create( str( self.getPath() ) )

		if reader is None :
			return None

		o = None
		with IECore.IgnoredExceptions( RuntimeError ) :
			o = reader.read()

		if not isinstance( o, IECore.VisibleRenderable ) :
			return None

		if isinstance( o, IECore.ImagePrimitive ) :
			## \todo Deal with colorspace uniformly everywhere, doing the
			# transformations in the viewers themselves.
			IECore.LinearToSRGBOp()( input=o, copyInput=False )

		return o

	def _deferredUpdate( self, o ) :

		self.__renderableGadget.setRenderable( o )

		if isinstance( o, IECore.ImagePrimitive ) :
			camera = IECore.Camera( parameters = { "projection" : "orthographic" } )
		else :
			camera = IECore.Camera( parameters = { "projection" : "perspective" } )

		self.__gadgetWidget.getViewportGadget().setCamera( camera )
		self.__gadgetWidget.getViewportGadget().frame( o.bound(), IECore.V3f( 0, 0, -1 ) )

GafferUI.PathPreviewWidget.registerType( "Preview", ImageReaderPathPreview )
