#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Knowledge Closure.Report Current Progress

by

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

The (imature) design is as follows:

      Thread   ---->  _______
                     |       |  ajax.cgi translates to JSON
Thread  ---->        |       |  ----------------------------> Browser
                     |       |
      Thread   ----> |       |
                     |_______|

Later thread might rewrite previous result
"""

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 simplejson
#I would prefer to use simplejson but it's too hard to install it on
# people.csail.mit.edu . dmejson is a one-file-library, which is better.
import demjson
from xml.dom.minidom import parseString
def give_current_progress():
    #read at once and close
    transaction_file = open(WRITABLE_DIRECTORY + "transaction_0.txt")
    lines = transaction_file.readlines()
    transaction_file.close()

    cluster = {}
    if lines[-1] == "FINISHED\n":
	cluster["isFinished"] = True
	lines.pop()
    else:
	cluster["isFinished"] = False


    contents = {}
    for line in lines:
# 	num, _ , html = line.partition(" ")
# 	assert html, "Missing html, a problem within check.cgi"
# 	parseString(html)
# 	contents["Test_" + str(num)] = html
	try:
	    paragraph = parseString(line).documentElement
	    contents[paragraph.getAttribute("id")] = line.rstrip()
	except:
	    print line
	    raise

	#The third way
# 	li = parseString(line).documentElement #very slow, it seems
# 	element = dict()
# 	element["class"] = li.getAttribute("class")
# 	element["textContent"] = li.firstChild.data
# 	contents[li.getAttribute("id")] = element

    cluster["contents"] = contents
    #simplejson.dump(cluster, sys.stdout)
    print demjson.encode(cluster)

sys.stderr = open(WRITABLE_DIRECTORY + "ajax_log.txt", 'w')
print "Content-type: application/json"
print

#@@Redo when error occurs
give_current_progress()
sys.stderr.close()
# time curl -i http://people.csail.mit.edu/kennyluck/Knowledge_Closure/ajax.cgi
# real    0m0.148s
# user    0m0.005s
# sys     0m0.006s

# real    0m0.311s 0m0.169s
# user    0m0.005s
# sys     0m0.006s