#!/usr/bin/python

import os
import sys
import argparse
import configobj
import datetime

from django.core.exceptions import ValidationError

# parse command line options
parser = argparse.ArgumentParser(
        description='Hosts injector for py-i2phosts.',
        epilog='Report bugs to https://github.com/i2phosts/py-i2phosts/issues')
parser.add_argument('-c', '--config', default='/etc/py-i2phosts/injector.conf', dest='config_file',
        help='config file to use')
parser.add_argument('-f', '--file', dest='hostsfile',
        help='hosts.txt for parsing')
parser.add_argument('-d', '--description', default='Auto-added from external hosts.txt',
        help='provide custom description message')
parser.add_argument('-a', '--approve', action='store_true',
        help='add hosts as approved')
parser.add_argument('-s', '--supress', action='store_true',
        help='supress warnings about already existed hostnames'),
parser.add_argument('-q', '--quiet', action='store_true',
        help='be completely quiet, print only errors')
args = parser.parse_args()

# read config
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
import django
django.setup()
from pyi2phosts.postkey.models import i2phost
from pyi2phosts.lib.validation import validate_hostname
from pyi2phosts.lib.validation import validate_b64hash

# determine approve hosts or not
if args.approve or config.as_bool('approve'):
    approved = True
else:
    approved = False

# turn on output supressing if quiet
if args.quiet:
    args.supress = True

# determine what hosts.txt file we should parse
if args.hostsfile:
    hostsfile = args.hostsfile
else:
    env = os.environ
    if 'HOME' in env:
        hostsfile = os.environ['HOME'] + '/.i2p/hosts.txt'
    else:
        sys.stderr.write('unable to determine hosts file for parsing\n')
        sys.exit(1)

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')
    # split and ignore comment after b64hash
    data = line.split("#!", 1)
    entry = data[0].split("=", 1)
    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:
        # Check for already existed hosts in database to avoid unneeded INSERTs
        # beacuse they will fail anyway.
        try:
            h = i2phost.objects.get(name=hostname)
        except i2phost.DoesNotExist:
            if not args.quiet:
                sys.stdout.write('Adding %s\n' % hostname)
            host = i2phost(name=hostname, b64hash=base64,
                    description=args.description,
                    date_added=datetime.datetime.utcnow(),
                    activated=False, external=True, approved=approved)
            host.save()
        else:
            if not args.supress:
                sys.stdout.write('Host %s already exists\n' % hostname)
            if h.b64hash != base64:
                sys.stdout.write('Key conflict for host: %s\n' % hostname)
f.close()