#!/usr/bin/python

import os
import sys
import configobj
import argparse

from django.core.exceptions import ValidationError

def build_list():
	h = []
	f = open(args.hostsfile, 'r')
	for line in f:
		# ignore comments and empty lines
		if line.startswith('#') or line.isspace():
			continue
		if line.find('=') == -1:
			sys.stdout.write('Invalid line: %s\n' % line)
			continue
		# strip trailing '\n'
		line = line.rstrip('\n')
		entry = line.split('=')
		try:
			hostname = validate_hostname(entry[0])
			base64 = validate_b64hash(entry[1], check_uniq=False) # don't require uniqueness
		except ValidationError, e:
			sys.stdout.write('validation error: %s: %s\n\n' % (e, line))
		else:
			h.append(hostname)
	f.close()
	return h


# parse command line options
parser = argparse.ArgumentParser(
		description='Description fixer for py-i2phosts.',
		epilog='Report bugs to https://github.com/i2phosts/py-i2phosts/issues')
parser.add_argument('-c', '--config', default='/etc/py-i2phosts/fixer.conf', dest='config_file',
		help='config file to use')
parser.add_argument('-f', '--file', dest='hostsfile',
		help='hosts.txt for parsing')
parser.add_argument('-n', '--newdescription',
		help='new description when fixing hosts with FIXME')
group = parser.add_mutually_exclusive_group()
group.add_argument('-d', '--description',
		help='description to look for')
group.add_argument('-i', '--fixme', action='store_true',
		help='update description for hosts where description=FIXME')
args = parser.parse_args()

config = configobj.ConfigObj(args.config_file)
if 'include' in config:
	config_included = configobj.ConfigObj(config['include'])
	config.merge(config_included)

# django setup
DJANGO_SETTINGS_MODULE = 'pyi2phosts.settings'
if 'DJANGO_PROJECT_PATH' in config:
	DJANGO_PROJECT_PATH = config['DJANGO_PROJECT_PATH']
else:
	DJANGO_PROJECT_PATH = os.path.dirname(sys.argv[0]) + '/..'
sys.path.insert(1, DJANGO_PROJECT_PATH)
os.environ['DJANGO_SETTINGS_MODULE'] = DJANGO_SETTINGS_MODULE

from pyi2phosts.lib.validation import validate_hostname
from pyi2phosts.lib.validation import validate_b64hash
from pyi2phosts.postkey.models import i2phost

if args.description:
	hosts_list = build_list()
	hosts = i2phost.objects.filter(description=args.description)
	for host in hosts:
		if host.name not in hosts_list:
			host.description = 'FIXME'
			host.save()
elif args.fixme:
	hosts_list = build_list()
	hosts = i2phost.objects.filter(description='FIXME')
	for host in hosts:
		if host.name in hosts_list:
			host.description = args.newdescription
			host.save()