#!/bin/env python

"""write out the important header information from a block of fits files"""

from pyfits import getheader
import sys,os,glob

def gemcat(files):
	

	for f in files:
		if f == '': continue
		
		h = getheader(f)
		s = ''
		
		try:
			date = h['date-obs']
			time = h['utstart']
			airmass = str(h['airmass'])
			exp = str(h['exposure'])
			filt =  h['filter2']
			
		except:
			#if this is not a standard file, ignore it
			print f + ' appears non-standard'
			continue
			
		s = s + f.ljust(23) + ' '
		s = s + date.ljust(11) + ' '
		s = s + time.ljust(11) + ' '
		s = s + exp.ljust(5) + ' '
		s = s + filt[0] + ' '
		s = s + airmass.ljust(5) + ' '
		
		print s

###################
def main():

	argv = sys.argv

	verbose = 1
	input = ''
	input2 = ''
	fileselector = ["*.fits"] #default
	if (len(argv)>=2): 
		for v in argv[1:]:
			if v[0] != '-': fileselector.append(v)
			
	if len(fileselector) > 1: fileselector = fileselector[1:]
	
	files = []
	for fs in fileselector:
		files += glob.glob(fs)
	
	nbadfilenames = 0
	for i in range(len(files)):
		f = files[i]
		#print f
		if f.find('.fit') < 0: 
			if (len(argv)>=2): print f + ' is not a fits file.'
			files[i] = ''
			nbadfilenames = nbadfilenames + 1
				
	if len(files) - nbadfilenames <= 0:
		print 'Error: No valid .fits files specified.'
		return 1
	
	gemcat(files)
	
###################

if __name__=='__main__':
	main()