#!/usr/bin/env python

import os, sys, re, json, datetime
import syslog
import traceback

syslog.openlog(os.path.basename(__file__), syslog.LOG_PID, syslog.LOG_USER)

# boilerplate
basedir = os.path.abspath(os.path.join(os.path.dirname(__file__), "../.."))
sys.path = [ basedir ] + sys.path
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "ietf.settings")

import django
django.setup()

from django.conf import settings
from optparse import OptionParser
from django.core.mail import mail_admins

parser = OptionParser()
parser.add_option("-d", dest="skip_date",
                  help="To speed up processing skip RFCs published before this date (default is one year ago)", metavar="YYYY-MM-DD")

options, args = parser.parse_args()

skip_date = datetime.date.today() - datetime.timedelta(days=365)
if options.skip_date:
    skip_date = datetime.datetime.strptime(options.skip_date, "%Y-%m-%d").date()

from ietf.utils.pipe import pipe
from ietf.sync.rfceditor import *
from ietf.doc.utils import rebuild_reference_relations

syslog.syslog("Updating document metadata from RFC index from %s" % settings.RFC_EDITOR_QUEUE_URL)

response = fetch_index_xml(settings.RFC_EDITOR_INDEX_URL)
data = parse_index(response)

if len(data) < MIN_INDEX_RESULTS:
    syslog.syslog("Not enough results, only %s" % len(data))
    sys.exit(1)

changed, new_rfcs  = update_docs_from_rfc_index(data, skip_older_than_date=skip_date)

for c in changed:
    syslog.syslog(c)

# This can be called while processing a notifying POST from the RFC Editor
# Spawn a child to sync the rfcs and calculate new reference relationships
# so that the POST

newpid = os.fork()

if newpid == 0:
    try:
        pipe("%s -a %s %s" % (settings.RSYNC_BINARY,settings.RFC_TEXT_RSYNC_SOURCE,settings.RFC_PATH))
        for rfc in new_rfcs:
            rebuild_reference_relations(rfc)
            syslog.syslog("Updated references for %s"%rfc.canonical_name())
    except:
        subject = "Exception in updating references for new rfcs: %s : %s" % (sys.exc_info()[0],sys.exc_info()[1])
        msg = "%s\n%s\n----\n%s"%(sys.exc_info()[0],sys.exc_info()[1],traceback.format_tb(sys.exc_info()[2])) 
        mail_admins(subject,msg,fail_silently=True)
        syslog.syslog(subject)
    os._exit(0)
else:
    sys.exit(0)