#==============================================================================
#
# Project:   SharpImage
# Module:    NaryPixelMath.py
# Language:  IronPython
# Author:    Dan Mueller
# Date:      $Date$
# Revision:  $Revision$
#
# Copyright (c) Queensland University of Technology (QUT) 2007.
# All rights reserved.
#
# This software is distributed WITHOUT ANY WARRANTY; without even
# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE.  See the above copyright notices for more information.
#
#==============================================================================

# Import the base script class
import ImageToImageScript
from ImageToImageScript import *

# Add reference and import PixelMath library
clr.AddReference("ManagedITK.PixelMathFilters")
from itk import *

class NaryPixelMathScript(ImageToImageScriptObject):
    # -------------------------------------------------------------------------
    Name = "NaryPixelMath"
    Help = """Performs pixel-wise operations on all open images."""
    Parameters = """(string) Operation = "Add" or "Max"."""
    Operation = None
    # -------------------------------------------------------------------------

    def ThreadedDoWork(self):
        """ Perform the main functions of the script on a background thread. """
        try:
            # Setup
            self.StartedWork()

            # Check Operation is not None
            if (self.Operation == None):
                self.WriteLineToConsole( "WARNING: Defaulting to Add due to invalid operation: None." )
                self.Operation = "Add"

            # Create correct filter instance
            ignoreCase = True
            filterPixelMath = None
            if (String.Compare( self.Operation, "Add", ignoreCase) == 0):
                filterPixelMath = itkNaryAddImageFilter.New( self.Input, self.Output )
            elif (String.Compare( self.Operation, "Max", ignoreCase) == 0):
                filterPixelMath = itkNaryMaximumImageFilter.New( self.Input, self.Output )
            else:
                self.WriteLineToConsole( "WARNING: Defaulting to Add due to unknown operation: '" + self.Operation + "'" )
                filterPixelMath = itkNaryAddImageFilter.New( self.Input, self.Output )

            # Add all open images as input
            i = 0
            for renderer in self.ParentApplication.Renderers:
                if (renderer != None and renderer.Inputs.Count > 0):
                    self.WriteImageName( "Input=", renderer.Inputs[0] )
                    filterPixelMath.SetInput( i, renderer.Inputs[0] )
                    i += 1
                    
            # Peform the work
            self.AddEventHandlersToProcessObject( filterPixelMath )
            filterPixelMath.UpdateLargestPossibleRegion()
            filterPixelMath.GetOutput( self.Output )
            self.Output.DisconnectPipeline()
            self.DisposeOfObject( filterPixelMath )
            self.WriteOutputName( )
            self.FinishedWork( True )
           
        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            self.Finalise( )