# Implementation of an ImageFormat class to read MarIP-format image

from __future__ import division

from dxtbx.format.Format import Format

class FormatEDFALS733(Format):
  '''EDF is the ESRF data format.
  In present context, ALS 7.3.3 uses this format for its single-tile Pilatus
  '''

  @staticmethod
  def understand(image_file):
    try:
      tag = FormatEDFALS733.open_file(image_file, 'rb').read(10)
    except IOError,e:
      return False

    return tag == "{\nHeaderID"

  def __init__(self, image_file):
    '''Initialise the image structure from the given file.'''

    assert(self.understand(image_file))

    Format.__init__(self, image_file)

  def _start(self):
    '''Open the image file, read the image header, copy the key / value
    pairs into an internal dictionary self._header_dictionary along with
    the length of the header in bytes self._header_size.'''
    from iotbx.detectors import EDFWrapper
    self.detectorbase = EDFWrapper(self._image_file)
    self.detectorbase.readHeader()

  def _goniometer(self):

    return self._goniometer_factory.single_axis()

  def _detector(self):
    '''Return a model for a simple detector'''

    twotheta = 0.0

    return self._detector_factory.simple(
        sensor = 'PAD',
        distance = self.detectorbase.parameters["DISTANCE"],
        beam_centre = (self.detectorbase.parameters["BEAM_CENTER_X"],
                       self.detectorbase.parameters["BEAM_CENTER_Y"]),
        fast_direction = '+x',
        slow_direction = '-y',
        pixel_size = (self.detectorbase.parameters["PIXEL_SIZE"],
                      self.detectorbase.parameters["PIXEL_SIZE"]),
        image_size = (self.detectorbase.parameters["SIZE1"],
                      self.detectorbase.parameters["SIZE2"]),
        trusted_range = (0, self.detectorbase.saturation),
        mask = [])  # a list of dead rectangles

  def _beam(self):
    '''Return a simple model for the beam.'''

    return self._beam_factory.simple(wavelength=1.0) # dummy argument

  def _scan(self):
    '''Return the scan information for this image.'''

    return self._scan_factory.single(
      filename = self._image_file,
      format = "EDF",
      exposure_times = self.detectorbase.parameters["count_time"],
      osc_start = 0.0,
      osc_width = 0.0,
      epoch = None)

if __name__ == '__main__':

  import sys

  for arg in sys.argv[1:]:
    print FormatEDFALS733.understand(arg)