#!/bin/env python

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

import pyfits
import sys,os,glob

def getval(h,lis):
        for k in lis:
                val = h.get(k)
                if val!=None: break
        if val == None: val = ''
        return str(val)

def fitscat(files):
	

	for f in files:
		if f == '': continue
		
		u = pyfits.open(f)
		h = u[0].header
		u.close()
		s = ''
		
                telkeys = ['TELESCOP']
		datekeys = ['UTC', 'UT', 'TIME-OBS', 'DATE-OBS']
                expkeys = ['EXPOSURE', 'EXP', 'EXPTIME', 'ELAPTIME', 'TTIME']
                filtkeys = ['FILTERS', 'FILTER', 'FILTER2', 'FILTER1', 'DWFILNAM', 'REDFILT', 'FILTNAM']
                objkeys = ['OBJECT']
                #targkeys = 
                rakeys = ['RA']
                deckeys = ['DEC']
                airkeys = ['AIRMASS']

                tel = getval(h,telkeys)
                date = getval(h,datekeys)
                exp = getval(h,expkeys)
                filt = getval(h,filtkeys)
                obj = getval(h,objkeys)
                ra = getval(h,rakeys)
                dec = getval(h,deckeys)
                air = getval(h,airkeys)

		s = s + f.ljust(20) + ' '
		s = s + tel.strip().ljust(11) + ' '
		s = s + date.strip().ljust(11) + ' '
		s = s + obj.strip().ljust(13) + ' '
		s = s + ra.strip().ljust(12) + ' '
		s = s + dec.strip().ljust(12) + ' '
		s = s + exp.strip().ljust(6) + ' '
		s = s + filt.strip()[0:3] + ' '
		s = s + air.ljust(5)[0:4] + ' '
		
		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 and f.find('.fts') < 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
	
	fitscat(files)
	
###################

if __name__=='__main__':
	main()