#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Knowledge Closure.SPARUL adapter


by

kennyluck <http://dig.csail.mit.edu/People/kennyluck#I>
"""

import sys
import os
#@@ change this to suitable folder
if os.environ['HTTP_HOST'] == 'dig.csail.mit.edu':
    WRITABLE_DIRECTORY = "/afs/csail.mit.edu/group/dig/www/data/2008/webdav/Knowledge_Closure/"
else:
    WRITABLE_DIRECTORY = ""

import re
from urlparse import urlparse
import httplib
NETLOC, PATH = 1, 2
log = open(WRITABLE_DIRECTORY + "inform_log.txt", 'w')
def LOG(string):
    log.write(string + '\n')

original_data = sys.stdin.read()
LOG("get from client: ")
LOG(original_data)

#@@ just a fast prototyle, should be a complete SPARQL parser
match = re.match(r"INSERT\s+INTO\s+<(?P<graph_uri>\S+)>(?P<clause>.+)",
		 original_data, re.DOTALL)
if not match:
    #@@ 500
    sys.exit(0)

dict = match.groupdict()
machine, location = urlparse(dict['graph_uri'])[NETLOC:(PATH+1)]

sent_data = "INSERT" + dict["clause"]
headers = {"Content-type" : 'application/sparql-query'}
conn = httplib.HTTPConnection(machine)
conn.request("POST", location, sent_data, headers)
response = conn.getresponse()
# print response.status, response.reason  #a 500 happened because of this

data = response.read()
conn.close()
LOG("Response:")
LOG(data)

print "Content-type: text/plain"
print
print "SUCCESS"

LOG("End: nothing goes wrong")
log.close()