import copy

from unittest import mock

from django_mailbox import models, utils
from django_mailbox.models import Message
from django_mailbox.tests.base import EmailMessageTestCase


__all__ = ["TestMessageFlattening"]


class TestMessageFlattening(EmailMessageTestCase):
    def test_quopri_message_is_properly_rehydrated(self):
        incoming_email_object = self._get_email_object(
            "message_with_many_multiparts.eml",
        )
        # Note: this is identical to the above, but it appears that
        # while reading-in an e-mail message, we do alter it slightly
        expected_email_object = self._get_email_object(
            "message_with_many_multiparts.eml",
        )
        models.TEXT_STORED_MIMETYPES = ["text/plain"]

        msg = self.mailbox.process_incoming_message(incoming_email_object)

        actual_email_object = msg.get_email_object()

        self.assertEqual(
            actual_email_object,
            expected_email_object,
        )

    def test_base64_message_is_properly_rehydrated(self):
        incoming_email_object = self._get_email_object(
            "message_with_attachment.eml",
        )
        # Note: this is identical to the above, but it appears that
        # while reading-in an e-mail message, we do alter it slightly
        expected_email_object = self._get_email_object(
            "message_with_attachment.eml",
        )

        msg = self.mailbox.process_incoming_message(incoming_email_object)

        actual_email_object = msg.get_email_object()

        self.assertEqual(
            actual_email_object,
            expected_email_object,
        )

    def test_message_handles_rehydration_problems(self):
        incoming_email_object = self._get_email_object(
            "message_with_defective_attachment_association.eml",
        )
        expected_email_object = self._get_email_object(
            "message_with_defective_attachment_association_result.eml",
        )
        # Note: this is identical to the above, but it appears that
        # while reading-in an e-mail message, we do alter it slightly
        message = Message()
        message.body = incoming_email_object.as_string()

        msg = self.mailbox.process_incoming_message(incoming_email_object)

        del msg._email_object  # Cache flush
        actual_email_object = msg.get_email_object()

        self.assertEqual(
            actual_email_object,
            expected_email_object,
        )

    def test_message_content_type_stripping(self):
        incoming_email_object = self._get_email_object(
            "message_with_many_multiparts.eml",
        )
        expected_email_object = self._get_email_object(
            "message_with_many_multiparts_stripped_html.eml",
        )
        default_settings = utils.get_settings()

        with mock.patch("django_mailbox.utils.get_settings") as get_settings:
            altered = copy.deepcopy(default_settings)
            altered["strip_unallowed_mimetypes"] = True
            altered["allowed_mimetypes"] = ["text/plain"]

            get_settings.return_value = altered

            msg = self.mailbox.process_incoming_message(incoming_email_object)

        del msg._email_object  # Cache flush
        actual_email_object = msg.get_email_object()

        self.assertEqual(
            actual_email_object,
            expected_email_object,
        )

    def test_message_processing_unknown_encoding(self):
        incoming_email_object = self._get_email_object(
            "message_with_invalid_encoding.eml",
        )

        msg = self.mailbox.process_incoming_message(incoming_email_object)

        expected_text = (
            "We offer loans to private individuals and corporate "
            "organizations at 2% interest rate. Interested serious "
            "applicants should apply via email with details of their "
            "requirements.\n\nWarm Regards,\nLoan Team"
        )
        actual_text = msg.text

        self.assertEqual(actual_text, expected_text)