from django.conf import settings
from django.core.mail import EmailMessage
from django.shortcuts import reverse

SENDER = settings.USETHESOURCE['SENDER']
LIST_RECIPIENT = settings.USETHESOURCE['LIST_RECIPIENT']


def make_candidate_email(candidate, user):
    """The initial email announcing the new candidate."""
    subject = candidate.name
    signature = user.get_full_name() or user.username
    sender = f'{signature} <{SENDER}>'
    to = [LIST_RECIPIENT]
    body = f'''\
We've just published the following new candidate:

{candidate.name}
Vendor: {candidate.vendor}
Device: {candidate.device}
Released: {candidate.release_date}

{candidate.description}

To view this candidate and download the source candidate and firmware image, visit:
https://sfconservancy.org{reverse('usethesource:candidate', kwargs={'slug': candidate.slug})}

--
{signature}
(Via https://sfconservancy.org{reverse('usethesource:landing')})'''
    headers = {'Message-ID': candidate.email_message_id}
    return EmailMessage(subject, body, sender, to, headers=headers)


def make_comment_email(comment):
    """Email when a comment is added to a candidate."""
    candidate = comment.candidate
    subject = f'Re: {candidate.name}'
    signature = comment.user.get_full_name() or comment.user.username
    sender = f'{signature} <{SENDER}>'
    to = [LIST_RECIPIENT]
    body = f'''\
{comment.message}

To view this candidate and download the source candidate and firmware image, visit:
https://sfconservancy.org{reverse('usethesource:candidate', kwargs={'slug': candidate.slug})}

--
{signature}
(Via https://sfconservancy.org{reverse('usethesource:landing')})'''
    headers = {'Message-ID': comment.email_message_id}
    if in_reply_to := comment.in_reply_to():
        # From my testing, both "In-Reply-To" and "References" headers trigger
        # email threading in Thunderbind. Sticking to "In-Reply-To" for now.
        headers['In-Reply-To'] = in_reply_to
    return EmailMessage(subject, body, sender, to, headers=headers)