#!/usr/bin/env python
# LabelitBeamCentre.py
#   Copyright (C) 2006 CCLRC, Graeme Winter
#
#   This code is distributed under the BSD license, a copy of which is
#   included in the root directory of this package.
#
# A module to get the "best" beam centre from a labelit run. This will be
# used from within xia2setup.py as a key part of configuring the .xinfo
# file.
#
# Note well that this will check the input beam centres from the header to
# see what they are before they start, and perhaps will set a sensible
# input default (e.g. the middle of the image) for the labelit run.
#
#

import os
import sys
import exceptions
import time

if not os.environ.has_key('XIA2_ROOT'):
  raise RuntimeError, 'XIA2_ROOT not defined'

if not os.environ['XIA2_ROOT'] in sys.path:
  sys.path.append(os.environ['XIA2_ROOT'])

from Wrappers.Labelit.LabelitIndex import LabelitIndex

def compute_beam_centre(sweep, working_directory = os.getcwd()):
  '''Compute the beam centre for the input sweep, working in the provided
  directory, perhaps.'''

  beam_centre = sweep.get_beam_centre()

  # perhaps fiddle with the beam_centre here, and hide the indexing output
  # that is a side-effect of this.

  try:
    ls = LabelitIndex(indxr_print = False)
    ls.setup_from_image(sweep.imagename(min(sweep.get_images())))
    beam_centre = ls.get_indexer_beam_centre()
  except exceptions.Exception, e:
    # do not have labelit installed?
    # need to check the exception
    import sys
    import traceback
    # traceback.print_exc(sys.stderr)

    return None

  return beam_centre

if __name__ == '__main__':

  from Experts.FindImages import image2template_directory
  from Schema.Sweep import SweepFactory

  if len(sys.argv) < 2:
    image = os.path.join(os.environ['XIA2_ROOT'],
                         'Data', 'Test', 'Images', '12287_1_E1_001.img')
  else:
    image = sys.argv[1]

  template, directory = image2template_directory(image)

  sl = SweepFactory(template, directory)

  for s in sl:

    print '%6.2f %6.2f' % compute_beam_centre(s)