import logging

from django.conf import settings
from django.core.mail import send_mail


logger = logging.getLogger(__name__)

CONFIRMATION_PATH = "/api/reservations/confirm/"


def build_confirmation_link(raw_confirmation_token):
    return f"{settings.SITE_BASE_URL}{CONFIRMATION_PATH}?token={raw_confirmation_token}"


def _log_confirmation_link_for_local_debug(*, confirmation_link):
    if not settings.LOG_RESERVATION_CONFIRMATION_URLS:
        return

    logger.warning(
        "LOCAL DEV confirmation URL: %s",
        confirmation_link,
    )


def send_confirmation_email(*, reservation, raw_confirmation_token):
    confirmation_link = build_confirmation_link(raw_confirmation_token)
    subject = f"Confirm your reservation for {reservation.performance.show.title}"
    message = (
        "Thank you for your reservation request.\n\n"
        "Please confirm your reservation by opening this link:\n"
        f"{confirmation_link}\n\n"
        "If you did not request this reservation, you can ignore this email."
    )

    _log_confirmation_link_for_local_debug(
        confirmation_link=confirmation_link,
    )

    try:
        send_mail(
            subject=subject,
            message=message,
            from_email=None,
            recipient_list=[reservation.email],
            fail_silently=False,
        )
    except Exception:
        if settings.LOG_RESERVATION_CONFIRMATION_URLS:
            logger.warning(
                "Local/debug email delivery failed for reservation %s.",
                reservation.id,
            )
            return

        logger.exception(
            "Failed to send confirmation email for reservation %s.",
            reservation.id,
        )