#!/usr/bin/python2.7
# -*- coding: utf-8 -*-
#
# Univention Joinscripts
"""Install join scripts."""
#
# Copyright 2007-2014 Univention GmbH
#
# http://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <http://www.gnu.org/licenses/>.

import os
import sys
import re
import subprocess
from glob import glob
from optparse import OptionParser

from univention.debhelper import doIt, binary_packages

def debhelper_file(package, ext):
	"""Name of a package configuration file."""
	return os.path.join('debian', '%s.%s.debhelper' % (package, ext))

JOINSCRIPT_DIR = '/usr/lib/univention-install'
UNJOINSCRIPT_DIR = '/usr/lib/univention-uninstall'

def _install_script(package, suffix, script_dir, dest_filename=None):
	cfile = '*%s.%s' % (package, suffix)
	try:
		filename = glob(cfile)[0]
	except IndexError:
		return None

	dest_path = os.path.join('debian', package, script_dir[1:])
	doIt('install', '-m', '755', '-d', dest_path)

	if dest_filename is None:
		dest_filename = filename
	dest_filename = os.path.join(dest_path, os.path.basename(dest_filename))
	doIt('install', '-m', '755', filename, dest_filename)

	return filename

def install_joinscript(package):
	joinscript_name = _install_script(package, 'inst', JOINSCRIPT_DIR)
	if joinscript_name:
		source = open(joinscript_name).readlines()
		if 'python' in source[0]:
			output = subprocess.check_output([os.path.join('.', joinscript_name), '--supports-unjoin'])
			if output == '1\n':
				base, ext = os.path.splitext(joinscript_name)
				match = re.match(r'^\d+', base)
				if match:
					base = '%02d%s' % (99 - int(match.group()), base[match.end():])
				unjoinscript_name = base + '-uninstall.uinst'
				_install_script(package, 'inst', UNJOINSCRIPT_DIR, unjoinscript_name)
			doIt('perl', '-e', 'use Debian::Debhelper::Dh_Lib;addsubstvar("%s", "misc:Depends", "univention-join (>= 7.1.1-2)");' % package)
		with open(debhelper_file(package, 'postinst'), 'a') as postinst:
			postinst.write('# Automatically added by univention-install-joinscript\n')
			postinst.write('. /usr/share/univention-lib/all.sh\n')
			postinst.write('call_joinscript %s\n' % joinscript_name)
			postinst.write('# End automatically added section\n')

	return joinscript_name

def install_unjoinscript(package, joinscript_name, unjoinscript_name=None):
	if unjoinscript_name is None:
		unjoinscript_name = _install_script(package, 'uinst', UNJOINSCRIPT_DIR) or _install_script('%s-uninstall' % package, 'uinst', UNJOINSCRIPT_DIR)
	if unjoinscript_name:
		with open(debhelper_file(package, 'preinst'), 'a') as preinst:
			preinst.write('# Automatically added by univention-install-joinscript\n')
			preinst.write('if [ "$1" = "install" ]; then\n')
			preinst.write('  test -e %s/%s && rm %s/%s\n' % (JOINSCRIPT_DIR, unjoinscript_name, JOINSCRIPT_DIR, unjoinscript_name))
			preinst.write('fi\n')
			preinst.write('# End automatically added section\n')

		with open(debhelper_file(package, 'prerm'), 'a') as prerm:
			prerm.write('# Automatically added by univention-install-joinscript\n')
			prerm.write('if [ "$1" = "remove" ]; then\n')
			prerm.write('  cp %s/%s %s\n' % (UNJOINSCRIPT_DIR, unjoinscript_name, JOINSCRIPT_DIR))
			prerm.write('fi\n')
			prerm.write('# End automatically added section\n')

		with open(debhelper_file(package, 'postrm'), 'a') as postrm:
			postrm.write('# Automatically added by univention-install-joinscript\n')
			postrm.write('if [ "$1" = "remove" ]; then\n')
			postrm.write('  . /usr/share/univention-lib/all.sh\n')
			postrm.write('  . /usr/share/univention-join/joinscripthelper.lib\n')
			postrm.write('  call_unjoinscript %s\n' % unjoinscript_name)
			if joinscript_name:
				joinscript_name = os.path.basename(joinscript_name)
				joinscript_name = os.path.splitext(joinscript_name)[0]
				joinscript_name = re.sub(r'^\d+', '', joinscript_name)
				postrm.write('  joinscript_remove_script_from_status_file %s\n' % joinscript_name)
			postrm.write('fi\n')
			postrm.write('# End automatically added section\n')

def main():
	"""Install (un)joinscripts."""
	usage = "%prog"
	epilog = '''This is a debhelper like
program to install Joinscripts and Unjoinscripts into the package build directories.

The joinscript *.inst goes to /usr/lib/univention-install/
The unjoinscript *.uinst goes to /usr/lib/univention-uninstall/
	'''
	parser = OptionParser(usage=usage, epilog=epilog)
	parser.add_option('-v', '--verbose',
			dest='verbose', action='store_true',
			help='Verbose mode: show all commands that modify the package build directory.')
	options, args = parser.parse_args()
	if options.verbose:
		os.environ['DH_VERBOSE'] = '1'
	if args:
		parser.error('No argument expected')

	try:
		for package in binary_packages():
			joinscript_name = install_joinscript(package)
			install_unjoinscript(package, joinscript_name)
	except IOError, ex:
		print >> sys.stderr, ex
		sys.exit(1)

if __name__ == '__main__':
	main()