#!/usr/bin/python
import cgi, os, os.path, time, re, xml.sax.saxutils, datetime

lockFileName = "files/todolock"
fileName = "files/todos.xml"

def getXMLDateString(date):
    return "<year>%d</year><month>%d</month><day>%d</day>" % (date.year, date.month, date.day)

while(os.path.exists(lockFileName)):
    time.sleep(.25)

lockFileHandle = open(lockFileName, "w")
lockFileHandle.write("locked")
lockFileHandle.close()

form = cgi.FieldStorage()
month = int(form.getfirst('month'))
year = int(form.getfirst('year'))
day = int(form.getfirst('day'))
numDays = form.getfirst('numDays')

startDate = datetime.date(year, month, day)

oldFile = open(fileName, 'r')
oldFileLines = oldFile.readlines()
oldFile.close()

print "Content-type: text/xml\n\n"
print "<entries>"
ticklerStartre = re.compile(r'<tickler>')
ticklerEndre = re.compile(r'</tickler>')
ticklerre = re.compile(r'<entry month="(\d+)" year="(\d+)" day="(\d+)" title=("|\')(.*?)\4.*$')

inTicklers = False
for line in oldFileLines:
    if (inTicklers):
        ticklerMatch = ticklerre.match(line)
        if (ticklerMatch):
            month = int(ticklerMatch.group(1))
            year = int(ticklerMatch.group(2))
            day = int(ticklerMatch.group(3))
            ticklerDate = datetime.date(year, month, day)
            if ((ticklerDate - startDate).days <= numDays):
                print "<entry>"
                print getXMLDateString(ticklerDate)
                print "<title>%s</title>" % ticklerMatch.group(5)
                print "</entry>"
    if (ticklerStartre.match(line)):
        inTicklers = True
    elif (ticklerEndre.match(line)):
        inTicklers = False

print "</entries>"
print "\n"

os.remove(lockFileName)