#!/usr/bin/python
#
# cgicount.py - A simple hit count CGI script
#
#
# Author: Alex Shindich (http://www.shindich.com/)
#

import sys
import cgi
import string
import XBMNumbers16x20

def PrintError (errorMessage):
	"""This function prints out an error message and exits the program"""
	print 'Content Type: text/html\n'
	print '%s\n' % errorMessage

	sys.exit ()

	
def IncNumber(fileName):
	"""This function reads the number from a source file,
	increments it and writes the new number value back into the file"""
	# Read the number from a file and increment 
	try:
		f = open (fileName, 'r')
		line = f.readline ()
		number = string.atoi (line) + 1
	except:
		number = 1

	try:
		# Save the new number in a file
		f = open (fileName, 'w')
		f.write (str(number))
		f.flush ()
	except:
		PrintError ("Failed to write into file '%s'" % fileName)
		
	return number

def GetFileName ():
	"""This function obtains the file name from cgi parameters"""
	try:
		# Get the cgi parameters
		parameters = cgi.SvFormContentDict()
		# We are looking for the file name here
		if parameters.has_key ("filename"):
			return parameters ["filename"]
		else:
			PrintError ('No file specified')
	except:	
		PrintError ('Unknown error while getting the file name parameter')

def main() :
	# Redirect the error output into the standard output
	sys.stderr = sys.stdout
	
	# Get the file name
	fileName = GetFileName ()
	# Increment the number in the file
	newNumber = IncNumber (fileName)
	# Increment the number in a file and print it out as an XBM file
	print XBMNumbers16x20.XBMNumbers16x20 (newNumber, 4, inverse=0)
	
if __name__ == '__main__':
		main ()