import os

from casatasks.private.casa_transition import is_CASA6
if is_CASA6:
    from casatools import image
    from casatasks import casalog
else:
    from taskinit import *
    from taskinit import iatool as image

def exportfits( imagename, fitsimage, velocity, optical, bitpix,
                minpix, maxpix, overwrite, dropstokes, stokeslast,
                history, dropdeg ):
        """Convert a CASA image to a FITS file:
        CASA-produced images can be written to disk for transporting
        to other software packages.  No subimaging of the fits image
        can be made with this task.

        Keyword arguments:
        imagename -- Name of input CASA image
                default: none; example: imagename='3C273XC1.image'
        fitsimage -- Name of input image FITS file
                default: none; example='3C273XC1.fits'
        velocity -- Prefer velocity (rather than frequency) as spectral axis
                default: False
        optical -- Use the optical (rather than radio) velocity convention
                default: True;
        bitpix -- Bits per pixel
                default: -32 (floating point)
                <Options: -32 (floating point), 16 (integer)>
        minpix -- Minimum pixel value
                default: 0 (if minpix > maxpix, value is automatically determined)
        maxpix -- Maximum pixel value
                default: -1 (if minpix > maxpix, value is automatically determined)
        overwrite -- Overwrite pre-existing imagename
                default=False; example: overwrite=True
        dropstokes -- Drop the Stokes axis?
                default: False; example: dropstokes=True
        stokeslast -- Put the stokes axis last in header?
                default: True; example: stokeslast=False
        history -- write the image history into the FITS file?
                default: True
        dropdeg -- drop all degenerate axes (e.g. Stokes and/or Frequency)?
                default: False

        """

        #Python script
        casalog.origin('exportfits')
        _myia = image( )
        _myia.open(imagename)
        _myia.tofits( outfile=fitsimage, velocity=velocity, optical=optical,
                      bitpix=bitpix, minpix=minpix, maxpix=maxpix,
                      overwrite=overwrite, dropstokes=dropstokes, stokeslast=stokeslast,
                      history=history, dropdeg=dropdeg )
        _myia.close( )
