##########################################################################
#
#  Copyright (c) 2017, 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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##########################################################################

import IECore

import Gaffer
import GafferUI

import GafferImage

class ImageReaderPathPreview( GafferUI.PathPreviewWidget ) :

	def __init__( self, path ) :

		column = GafferUI.SplitContainer( GafferUI.SplitContainer.Orientation.Vertical )

		GafferUI.PathPreviewWidget.__init__( self, column, path )

		self.__script = Gaffer.ScriptNode( "imagePreview" )
		self.__script["ImageReader"] = GafferImage.ImageReader()

		with column :
			self.__viewer = GafferUI.Viewer( self.__script )
			GafferUI.Timeline( self.__script )

		self._updateFromPath()

	def isValid( self ) :

		path = self.getPath()
		if not isinstance( path, ( Gaffer.FileSystemPath, Gaffer.SequencePath ) ) or not path.isLeaf() :
			return False

		if isinstance( path, Gaffer.SequencePath ) :

			try :
				sequence = IECore.FileSequence( str( path ) )
				ext = sequence.fileName.split( "." )[-1]
			except :
				return False

		else :
			ext = str(path).split( "." )[-1]

		return ext in GafferImage.ImageReader.supportedExtensions()

	def _updateFromPath( self ) :

		if not self.isValid() :
			self.__script.selection().clear()
			return

		path = self.getPath()

		if isinstance( path, Gaffer.SequencePath ) :
			try :
				sequence = IECore.FileSequence( str( path ) )
			except :
				return
			fileName = sequence.fileName
			frames = sequence.frameList.asList()
		else :
			fileName = str( path )
			frames = None

		self.__script["ImageReader"]["fileName"].setValue( fileName )

		if frames :
			self.__script.context().setFrame( frames[0] )
			self.__script["frameRange"]["start"].setValue( frames[0] )
			self.__script["frameRange"]["end"].setValue( frames[-1] )
			GafferUI.Playback.acquire( self.__script.context() ).setFrameRange( frames[0], frames[-1] )

		self.__script.selection().add( self.__script["ImageReader"] )

		with self.__script.context() :
			viewport = self.__viewer.viewGadgetWidget().getViewportGadget()
			if viewport.getPrimaryChild() is not None :
				viewport.frame( viewport.getPrimaryChild().bound() )

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