import datetime
import re

from django.contrib.auth.models import User
import pytest

from . import models
from .emails import make_comment_email
from .models import Candidate, Comment


def make_candidate(save=False, **kwargs):
    defaults = {
        'name': 'Test Candidate',
        'slug': 'test',
        'vendor': 'test vendor',
        'device': 'test device',
        'release_date': datetime.datetime(2000, 1, 1, tzinfo=datetime.timezone.utc)
    }
    merged = defaults | kwargs
    obj = Candidate(**merged)
    if save:
        obj.save()
    return obj


def test_message_id():
    assert re.match(r'<.+@.+>', models.gen_message_id())


@pytest.mark.django_db
def test_comment_knows_comment_its_replying_to():
    user = User.objects.create()
    candidate = make_candidate(name='Test Candidate', save=True)
    first_comment = Comment.objects.create(user=user, candidate=candidate)
    second_comment = Comment.objects.create(user=user, candidate=candidate)
    assert second_comment._find_previous_comment() == first_comment
    assert second_comment.in_reply_to() == first_comment.email_message_id


@pytest.mark.django_db
def test_comment_email():
    user = User.objects.create(first_name='Test', last_name='User')
    candidate = make_candidate(name='Test Candidate', save=True)
    models.Comment.objects.create(candidate=candidate, user=user)
    second_comment = models.Comment.objects.create(
        candidate=candidate,
        user=user,
        message='Test message',
    )
    email = make_comment_email(second_comment)
    assert 'Message-ID' in email.extra_headers
    assert 'In-Reply-To' in email.extra_headers
    assert email.subject == 'Re: Test Candidate'
    assert 'Test message' in email.body
    assert 'Test User' in email.body