#!/usr/bin/python
import cgi, os, os.path, time, re

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

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

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

form = cgi.FieldStorage()
#name = form['title'].value
#nextAction = form['nextAction'].value
idToRemove = int(form.getfirst("todoID"))

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

todoIDre = re.compile(r'^<todo todoID="%d"' % idToRemove)
lineIndex = 0
for line in oldFileLines:
    todoIDmatch = todoIDre.match(line)
    if (todoIDmatch):
        del oldFileLines[lineIndex]
        break
    lineIndex = lineIndex + 1

newFile = open(fileName, 'w')
for line in oldFileLines:
    newFile.write(line)
newFile.close()

os.remove(lockFileName)

print "Content-type: text/plain\n\n"
print "done."