from datetime import datetime
from pytask.taskapp.events.task import addCredits, addMentor
from pytask.taskapp.events.user import changeRole
from pytask.taskapp.utilities.notification import create_notification

def reply_to_request(request_obj, reply, replied_by):
    """
    makes a request replied with the given reply.
    arguments:
        request_obj - Request object for which change is intended
        reply - a boolean value to be given as reply (True/False)
        replied_by - the user object who replies to the request
    """
    if not request_obj.is_replied:
        request_obj.reply = reply
        request_obj.is_replied = True
        request_obj.reply_date = datetime.now()
        request_obj.replied_by = replied_by
        request_obj.save()

        if request_obj.role == "PY":
            ## note that we are not doing any check. we make requests invalid when an event like closing task happens.
            task = request_obj.task
            pynts = request_obj.pynts
            receiving_user = request_obj.receiving_user
            requested_by = request_obj.sent_by
            for a_mentor in task.mentors.all():
                if reply:
                    addCredits(task, request_obj.sent_by, request_obj.receiving_user, pynts)
                    create_notification(request_obj.role, a_mentor, replied_by, True, task, request_obj.remarks, requested_by, receiving_user, pynts)
                else:
                    create_notification(request_obj.role, a_mentor, replied_by, False, task, request_obj.remarks, requested_by, receiving_user, pynts)

        elif request_obj.role == "MT":
            task = request_obj.task
            requested_by = request_obj.sent_by
            if reply:
                ## tell the replied user that he is mentor for this task and give him learn more link
                create_notification("NT", request_obj.replied_by, task=task) 

                ## alert all the mentors including who made request and all assigned users
                for a_mentor in task.mentors.all():
                    create_notification(request_obj.role, a_mentor, replied_by, True, task, request_obj.remarks, requested_by)
                for a_user in task.assigned_users.all():
                    create_notification(request_obj.role, a_user, replied_by, True, task, request_obj.remarks, requested_by)

                addMentor(task, request_obj.replied_by)
            else:
                ## tell the requested user that his request was rejected due to these reasons.
                create_notification(request_obj.role, requested_by, replied_by, False, task, request_obj.remarks, requested_by)

        elif request_obj.role in ["AD", "MG", "DV"]:
            if reply:
                ## make him the role
                ## here we check for rights just in case to be fine with demoted users. we change only the user who made request has that rights.
                changeRole(role=request_obj.role, user=request_obj.replied_by)
            else:
                ## notify request_obj.sent_by that it has been rejected
                pass
        return True #Reply has been added successfully
    return False #Already replied