#==============================================================================
#
# Project:   SharpImage
# Module:    GenerateMask.py
# Language:  IronPython
# Author:    Dan Mueller
# Date:      $Date: 2007-07-06 10:57:00 +1000 (Fri, 06 Jul 2007) $
# Revision:  $Revision: 2 $
#
# 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 required libraries
clr.AddReference("ManagedITK.IntensityFilters")
from itk import *

class GenerateMaskScript(ImageToImageScriptObject):
    # -------------------------------------------------------------------------
    Name = "GenerateMask"
    Help = """Generates a mask image using a number of objects specified using widgets."""
    Form = None
    Renderers = None
    Selections = None
    # -------------------------------------------------------------------------

    def Run(self):
        """ The entry-point for this script. """
        self.Initialise()
        # NOTE: DoWork() will be invoked when Continue is clicked.
        # NOTE: Finalise() will be invoked when FinishedWork() is called.

    def Initialise(self):
        """ Initialise the environment for running this script. """
        """ NOTE: This function is invoked on the main UI thread. """
        # Initialise
        ImageToImageScriptObject.Initialise( self )
        
        # Make output unsigned char
        self.Output = itkImage.New( itkPixelType.UC, self.Input.Dimension )

        # Search for inputs
        self.Renderers = List[siRenderer]()
        pattern = Path.GetFileNameWithoutExtension( self.Input.Name )
        self.Renderers = self.GetAllRenderersMatchingPattern( pattern )

        # Write the inputs used
        for renderer in self.Renderers:
            name = Path.GetFileName( renderer.Inputs[0].Name )
            self.WriteLineToConsole( "Using Input: " + name )

        # Show the form
        self.Form = siFormSelection( self.Renderers )
        self.Form.Continue += self.Continue
        self.Form.Cancel += self.Cancel
        self.ParentApplication.AddTool( self.Form )
        self.ParentApplication.SetApplicationAsReady( 0 )

    def ThreadedDoWork(self):
        """ Perform the main functions of the script. """
        """ NOTE: This function is invoked on a background thread. """
        try:
            # Start the work
            self.StartedWork()
            self.WriteInputName()

            # Generate the mask
            self.GenerateMask( )

            # Finish work
            self.WriteOutputName()
            self.UnregisterEventHandlers()
            self.FinishedWork( True )

        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            self.Finalise( )

    def GenerateMask(self):
        """ Generate the mask using the GenerateMask filter. """
        filterMask = itkGenerateMaskImageFilter.New( self.Output )
        self.AddEventHandlersToProcessObject( filterMask )
        for selection in self.Selections:
            if (String.Compare( selection.GenerateMaskImageFilterType, "Ellipse", True ) == 0):
                self.WriteLineToConsole( selection.ToString() )
                filterMask.AddEllipse( selection.Center, selection.Radius )
            if (String.Compare( selection.GenerateMaskImageFilterType, "Point", True ) == 0):
                for point in selection.Points:
                    self.WriteLineToConsole( "Point: " + point.ToString() )
                    filterMask.AddPoint( point )
            if (String.Compare( selection.GenerateMaskImageFilterType, "Region", True ) == 0):
                region = selection.ToImageRegion()
                self.WriteLineToConsole( "Region: " + region.ToString() )
                filterMask.AddRegion( region )
            if (String.Compare( selection.GenerateMaskImageFilterType, "Image", True ) == 0):
                if (hasattr(selection, "ToImage")):
                    filterMask.AddImage( selection.ToImage() )
        filterMask.Size = self.Input.Size
        filterMask.Spacing = self.Input.Spacing
        filterMask.Origin = self.Input.Origin
        filterMask.UpdateLargestPossibleRegion()
        filterMask.GetOutput( self.Output )
        self.DisconnectInputAndOutput();
        self.DisposeOfObject( filterMask )

    def Continue(self, sender, args):
        """ Allow processing to continue. """
        self.Selections = self.Form.Selections
        self.DoWork()

    def Cancel(self, sender, args):
        """ Cancel the script. """
        self.UnregisterEventHandlers()
        ScriptObject.Finalise( self )

    def UnregisterEventHandlers(self):
        """ Unregister all the event handlers. """
        if (self.Form != None):
            self.Form.Continue -= self.Continue
            self.Form.Cancel -= self.Cancel
            self.Form = None