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.db.models.functions import Now

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"

    @staticmethod
    def survey_url(event: EventExt, attendee_name: str, attendee_email: str) -> str:
        return "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": attendee_name,
                "participant_email": attendee_email,
            },
            quote_via=quote,
        )

    @classmethod
    def render_for_event(cls, event: EventExt) -> Iterable[mail.EmailMessage]:
        for name, email in event.attendees.values_list("name", "email"):
            sanitized_email = mail.message.sanitize_address(
                (name, email), settings.DEFAULT_CHARSET
            )
            survey_url = cls.survey_url(event, name, email)
            yield cls.render(
                {"event": event, "attendee_name": name, "survey_url": survey_url},
                to=[sanitized_email],
            )


def send_survey_emails():
    with mail.get_connection() as conn:
        for event in EventExt.objects.filter(
            occurred=True, should_survey=True, survey_email_sent=False, end__lt=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)))