from datetime import datetime

def publishTask(task):

    """ set the task status to open """

    task.status = "OP"

    task.save()

    return task

def addMentor(task,mentor):

    """ add the mentor to mentors list of the task """

    task.mentors.add(mentor)

    task.save()

    return task    

def createTask(title,desc,created_by,credits):

    """ creates a bare minimum task with title, description and credits.

    the creator of the task will be assigned as a mentor for the task.

    """

    try:

        task = Task.objects.get(title__iexact=title)

        return None

    except Task.DoesNotExist:

        task = Task(title=title)

    task.desc = desc

    task.created_by = created_by

    task.credits = credits

    task.creation_datetime = datetime.now()

    task.save()

    return task

def addSubTask(main_task, sub_task):

    """ add sub_task to subs list of main_task """

    main_task.subs.add(sub_task)

    main_task.status = "LO"

    main_task.save()

    return main_task