#!/usr/bin/env python
# -*- coding: utf-8 -*-

# arCHMage -- extensible reader and decompiler for files in the CHM format.
#
# Originally written by Eugeny Korekin <aaaz@users.sourceforge.net>
# Significantly modified by Basil Shubin <bashu@users.sourceforge.net>
#
# Copyright (c) 2003 Eugeny Korekin <aaaz@users.sourceforge.net>
# Copyright (c) 2005-2007 Basil Shubin <bashu@users.sourceforge.net>


"""arCHMage -- extensible reader and decompiler for files in the CHM format.

Usage: %(program)s [options] <chmfile> [destdir]
Where:

    -x / --extract
        Extracts CHM file into specified directory. If destination
        directory is ommited, than the new one will be created based
        on name of CHM file. This options is by defaut.

    -p number
    --port=number
        Acts as HTTP server on specified port number, so you can read
        CHM file with your favourite browser. You can specify a directory
        with decompressed content.

    -d / --dump
        Dump HTML data as plain text into standard output.

    -V / --version
        Print version number and exit.

    -h / --help
        Print this text and exit.
"""

import os
import sys
import getopt

from archmod import __version__, message, error_msg

from archmod.CHM import *

program = sys.argv[0]

EXTRACT = 1
HTTPSERVER = 2
DUMPHTML = 3

COMMASPACE = ', '

def usage(code=0, msg=''):
	message(code, __doc__ % globals())
	message(code, msg)
	sys.exit(code)

def file2dir(filename):
	""" Convert filename.chm to filename_html """
	dirname = filename.rsplit('.', 1)[0] + '_' + 'html'
	return dirname

def parseargs():
	try:
		opts, args = getopt.getopt(sys.argv[1:], 'xdp:Vh',
								   ['extract', 'dump', 'port=', 'version', 'help'])
	except getopt.error, msg:
		usage(1, msg)

	class Options:
		mode = None        # EXTRACT or HTTPSERVER or other
		port = None        # HTTP port number
		chmfile = None     # CHM File to view/extract
		dirname = None     # Destination directory

	options = Options()

	for opt, arg in opts:
		if opt in ('-h', '--help'):
			usage()
		elif opt in ('-V', '--version'):
			message(0, __version__)
			sys.exit(0)
		elif opt in ('-p', '--port'):
			if options.mode is not None:
				usage(1, '-x and -p are mutually exclusive')
			options.mode = HTTPSERVER
			try:
				options.port = int(arg)
			except ValueError, msg:
				usage(1, 'Invalid port number: %s' % msg)
		elif opt in ('-x', '--extract'):
			if options.mode is not None:
				usage(1, '-x and -p are mutually exclusive')
			options.mode = EXTRACT
		elif opt in ('-d', '--dump'):
			if options.mode is not None:
				usage(1, '-d should be used without any other options')
			options.mode = DUMPHTML
		else:
			assert False, (opt, arg)

    # Sanity checks
	if options.mode is None:
		options.mode = EXTRACT

	if not args:
		usage(1, 'No CHM file was specified!')
	else:
		options.chmfile = args.pop(0)

	# CHM content should be extracted
	if options.mode == EXTRACT:
		if not args:
			options.dirname = file2dir(options.chmfile)
		else:
			options.dirname = args.pop(0)
			
	# Any other arguments are invalid
	if args:
		usage(1, 'Invalid arguments: ' + COMMASPACE.join(args))

	return options


def main():
	options = parseargs()
	if not os.path.exists(options.chmfile):
		error_msg('No such file: %s' % options.chmfile)

	# Check where is argument a CHM file or directory with decompressed
	# content. Depending on results make 'source' instance of CHMFile or
	# CHMDir class.
	source = os.path.isfile(options.chmfile) and \
			 CHMFile(options.chmfile) or CHMDir(options.chmfile)

	if options.mode == HTTPSERVER:
		CHMServer(source, port=options.port).run()
	elif options.mode == DUMPHTML:
		source.dump_html()
	else:
		source.extract(options.dirname)

if __name__ == '__main__':
    main()