"""Allauth overrides"""

from __future__ import absolute_import
import json
import logging

from allauth.account.adapter import DefaultAccountAdapter
from django.template.loader import render_to_string

from readthedocs.core.utils import send_email

try:
    from django.utils.encoding import force_text
except ImportError:
    from django.utils.encoding import force_unicode as force_text

log = logging.getLogger(__name__)


class AccountAdapter(DefaultAccountAdapter):

    """Customize Allauth emails to match our current patterns"""

    def format_email_subject(self, subject):
        return force_text(subject)

    def send_mail(self, template_prefix, email, context):
        subject = render_to_string(
            '{0}_subject.txt'.format(template_prefix), context
        )
        subject = " ".join(subject.splitlines()).strip()
        subject = self.format_email_subject(subject)

        # Allauth sends some additional data in the context, remove it if the
        # pieces can't be json encoded
        removed_keys = []
        for key in list(context.keys()):
            try:
                _ = json.dumps(context[key])  # noqa for F841
            except (ValueError, TypeError):
                removed_keys.append(key)
                del context[key]
        if removed_keys:
            log.debug('Removed context we were unable to serialize: %s',
                      removed_keys)

        send_email(
            recipient=email,
            subject=subject,
            template='{0}_message.txt'.format(template_prefix),
            template_html='{0}_message.html'.format(template_prefix),
            context=context
        )