#!/usr/bin/python
# vim: set fileencoding=utf-8 :

import os
import sys
import datetime
import argparse
import logging
import configobj

# parse command line options
parser = argparse.ArgumentParser(
		description='Hosts maintainer for py-i2phosts.',
		epilog='Report bugs to http://zzz.i2p/topics/733')
parser.add_argument('-d', '--debug', action='store_true',
		help='write debug messages to stdout')
parser.add_argument('-c', '--config', default='/etc/py-i2phosts/maintainer.conf', dest='config_file',
		help='config file to use')
args = parser.parse_args()

# read config
spec = '''
	log_file = string(default='/var/log/py-i2phosts/maintainer.log')
	log_level = option('debug', 'info', 'warning', 'error', 'critical', default='info')
	external_inactive_max = integer(default=365)
	internal_inactive_max = integer(default=14)
	external_expires = integer(default=30)
	internal_expires = integer(default=30)
	activate_min_delay = integer(default=3)
	keep_expired = integer(default=730)
	'''
spec = spec.split('\n')
config = configobj.ConfigObj(args.config_file, configspec=spec)
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.postkey.models import i2phost
from pyi2phosts.lib.utils import get_logger
from pyi2phosts.lib.utils import validate_config

# validate config
validate_config(config)

# configure logger
if args.debug == True:
	log_level = 'debug'
	log_file = None
else:
	log_level = config['log_level']
	log_file = config['log_file']
log = get_logger(filename=log_file, log_level=log_level)

all_hosts = i2phost.objects.all()
log.info('starting maintenance')
for host in all_hosts:
	# how long host was added
	dl = datetime.datetime.utcnow() - host.date_added
	if host.last_seen == None:
		# delete external hosts which we never seen after X days of inactivity
		if host.external == True:
			if dl > datetime.timedelta(days=config['external_inactive_max']):
				log.info('deleting %s, reason: external host, never seen for %s days',
						host.name, config['external_inactive_max'])
				host.delete()
				continue
		# delete hosts added by us and never seen after X days of inactivity
		else:
			if dl > datetime.timedelta(days=config['internal_inactive_max']):
				log.info('deleting %s, reason: internal host, never seen for %s days',
						host.name, config['internal_inactive_max'])
				host.delete()
				continue
	else:
		# configure registration period for hosts
		if host.external == True:
			timedelta = datetime.timedelta(days=config['external_expires'])
		else:
			timedelta = datetime.timedelta(days=config['internal_expires'])
		# get current host expiration date from database
		if host.expires == None:
			# workaround for situation when we updating expires first time
			expires_current = datetime.datetime.utcnow().date()
		else:
			expires_current = host.expires
		# calculate new expiration date
		expires_new = host.last_seen + timedelta
		expires_new = expires_new.date()
		# update expiration date only if changed
		if expires_new > expires_current:
			log.debug('updating expires for %s', host.name)
			host.expires = expires_new
		# deactivate if expired
		min_dl = datetime.timedelta(days=config['activate_min_delay'])
		if host.expires < datetime.datetime.utcnow().date():
			if host.activated == True:
				log.info('deactivating %s, reason: expired', host.name)
				host.activated = False
		# if not expired and added more than X days ago and approved then activate
		elif dl > min_dl and host.activated == False and host.approved == True:
			log.info('activating %s, reason: host up and added more than %s days ago',
					host.name, config['activate_min_delay'])
			host.activated = True
		# if expired X days ago then delete
		dl_e = datetime.datetime.utcnow().date() - host.expires
		if dl_e > datetime.timedelta(days=config['keep_expired']):
			log.info('deleting %s, reason: expired % days ago',
					host.name, config['keep_expired'])
			host.delete()
			continue
		host.save()