from datetime import datetime

from django.contrib.auth.models import User

from pytask.taskapp.models import Request, Profile

def create_request(sent_by,role,sent_to=None,task=None,receiving_user=None,pynts=0):

    """

    creates an unreplied request, based on the passed arguments

        sent_to - a list of users to which the request is to be sent

        sent_by - sender of request

        role - a two character field which represents the role requested, if role = 'PY' then sent to all admins

        task - a requesting task (useful for sending admins a request to give Pynts to the user)

        receiving_user - user to whom the Pynts is assigned to(useful for sending admins a request to give Pynts to the user)

        pynts - the pynts assigned to the receiving user

    """

    req = Request(creation_date=datetime.now())

    req.sent_by = sent_by

    req.reply_date = datetime(1970,01,01)

    req.role = role

    req.pynts = pynts

    if task:

        req.task = task

    req.save()

    if role == 'PY':

        admin_profiles = Profile.objects.filter(rights='AD')

        for admin_profile in admin_profiles:

            req.sent_to.add(admin_profile.user)

        req.receiving_user = receiving_user

    else:

        req.sent_to.add(sent_to)

    req.save()

def get_request(rid, user):

    """ see if the request is replied or if he can not view the request,

    raise 404 error. else return request.

    """

    active_requests = user.request_sent_to.filter(is_valid=True, is_replied=False).order_by('creation_date')

    current_requests = active_requests.filter(id=rid)

    if current_requests:

        current_request = current_requests[0]

        try:

            newer_request = current_request.get_next_by_creation_date(sent_to=user, is_replied=False, is_valid=True)

            newest_request = active_requests.reverse()[0]

            if newer_request == newest_request:

                newest_request = None

        except Request.DoesNotExist:

            newer_request, newest_request = None, None

        try:

            older_request = current_request.get_previous_by_creation_date(sent_to=user, is_replied=False, is_valid=True)

            oldest_request = active_requests[0]

            if oldest_request == older_request:

                oldest_request = None

        except Request.DoesNotExist:

            older_request, oldest_request = None, None

        return newest_request, newer_request, current_request, older_request, oldest_request 

    else:

        return None, None, None, None, None