import logging
from collections.abc import Iterable
from urllib.parse import quote, urlencode

from django.conf import settings
from django.core import mail
from django.utils import timezone

from cmsmanage.django_q2_helper import q_task_group
from cmsmanage.email import TemplatedMultipartEmail
from membershipworks.models import EventExt

logger = logging.getLogger(__name__)


class EventSurveyEmail(TemplatedMultipartEmail):
    # TODO: better wording
    subject = (
        "[Claremont MakerSpace] Please fill out a survey for your recent CMS class!"
    )
    from_email = "CMS Classes <classes@claremontmakerspace.org>"

    template = "membershipworks/email/event_survey.dj.html"

    @classmethod
    def render_for_event(cls, event: EventExt) -> Iterable[mail.EmailMessage]:
        # not using event.attendees because that makes getting ticket count harder
        for attendee in event.details["usr"]:
            # skip users with no tickets, as they were Voided
            if sum(attendee["tkt"]) == 0:
                continue

            name = attendee["nam"]
            email = attendee["eml"]

            sanitized_email = mail.message.sanitize_address(
                (name, email), settings.DEFAULT_CHARSET
            )
            survey_url = (
                "https://claremontmakerspace.org/class-evaluation-form?"
                + urlencode(
                    {
                        "event_id": event.eid,
                        "instructor_name": (
                            str(event.instructor) if event.instructor else ""
                        ),
                        "event_name": event.title,
                        "event_date": event.start.strftime("%Y-%m-%d %H:%M:%S"),
                        "participant_name": name,
                        "participant_email": email,
                    },
                    quote_via=quote,
                )
            )

            yield cls.render(
                {"event": event, "attendee_name": name, "survey_url": survey_url},
                to=[sanitized_email],
            )


@q_task_group("Send Event Survey Emails")
def send_survey_emails():
    with mail.get_connection() as conn:
        # not using django.db.models.functions.Now() because of
        # timezone mismatch, see
        # https://code.djangoproject.com/ticket/31638
        for event in EventExt.objects.filter(
            occurred=True,
            should_survey=True,
            survey_email_sent=False,
            end__lt=timezone.now(),
        ):
            logger.info("Sending survey messages for event: %s", event)

            # mark as sent even if we don't finish, to prevent sending duplicates
            event.survey_email_sent = True
            event.save()

            conn.send_messages(list(EventSurveyEmail.render_for_event(event)))