# -*- coding: utf-8 -*-

import json

from base64 import b64encode, b64decode
from datetime import datetime
from decimal import Decimal
from email.mime.base import MIMEBase
from email.mime.image import MIMEImage

import six
from django.core import mail
from django.test import SimpleTestCase
from django.test.utils import override_settings
from django.utils.timezone import get_fixed_timezone, override as override_current_timezone

from anymail.exceptions import (AnymailAPIError, AnymailConfigurationError, AnymailSerializationError,
                                AnymailUnsupportedFeature)
from anymail.message import attach_inline_image_file

from .mock_requests_backend import RequestsBackendMockAPITestCase, SessionSharingTestCasesMixin
from .utils import sample_image_content, sample_image_path, SAMPLE_IMAGE_FILENAME, AnymailTestMixin

# noinspection PyUnresolvedReferences
longtype = int if six.PY3 else long  # NOQA: F821


@override_settings(EMAIL_BACKEND='anymail.backends.sendinblue.EmailBackend',
                   ANYMAIL={'SENDINBLUE_API_KEY': 'test_api_key'})
class SendinBlueBackendMockAPITestCase(RequestsBackendMockAPITestCase):
    # SendinBlue v3 success responses are empty
    DEFAULT_RAW_RESPONSE = b'{"messageId":"<201801020304.1234567890@smtp-relay.mailin.fr>"}'
    DEFAULT_STATUS_CODE = 201  # SendinBlue v3 uses '201 Created' for success (in most cases)

    def setUp(self):
        super(SendinBlueBackendMockAPITestCase, self).setUp()
        # Simple message useful for many tests
        self.message = mail.EmailMultiAlternatives('Subject', 'Text Body', 'from@example.com', ['to@example.com'])


class SendinBlueBackendStandardEmailTests(SendinBlueBackendMockAPITestCase):
    """Test backend support for Django standard email features"""

    def test_send_mail(self):
        """Test basic API for simple send"""
        mail.send_mail('Subject here', 'Here is the message.',
                       'from@sender.example.com', ['to@example.com'], fail_silently=False)
        self.assert_esp_called('https://api.sendinblue.com/v3/smtp/email')
        http_headers = self.get_api_call_headers()
        self.assertEqual(http_headers["api-key"], "test_api_key")
        self.assertEqual(http_headers["Content-Type"], "application/json")

        data = self.get_api_call_json()
        self.assertEqual(data['subject'], "Subject here")
        self.assertEqual(data['textContent'], "Here is the message.")
        self.assertEqual(data['sender'], {'email': "from@sender.example.com"})
        self.assertEqual(data['to'], [{'email': "to@example.com"}])

    def test_name_addr(self):
        """Make sure RFC2822 name-addr format (with display-name) is allowed

        (Test both sender and recipient addresses)
        """
        msg = mail.EmailMessage(
            'Subject', 'Message', 'From Name <from@example.com>',
            ['Recipient #1 <to1@example.com>', 'to2@example.com'],
            cc=['Carbon Copy <cc1@example.com>', 'cc2@example.com'],
            bcc=['Blind Copy <bcc1@example.com>', 'bcc2@example.com'])
        msg.send()
        data = self.get_api_call_json()
        self.assertEqual(data['sender'], {'email': "from@example.com", 'name': "From Name"})
        self.assertEqual(data['to'], [{'email': "to1@example.com", 'name': "Recipient #1"},
                                      {'email': "to2@example.com"}])
        self.assertEqual(data['cc'], [{'email': "cc1@example.com", 'name': "Carbon Copy"},
                                      {'email': "cc2@example.com"}])
        self.assertEqual(data['bcc'], [{'email': "bcc1@example.com", 'name': "Blind Copy"},
                                       {'email': "bcc2@example.com"}])

    def test_email_message(self):
        email = mail.EmailMessage(
            'Subject', 'Body goes here', 'from@example.com',
            ['to1@example.com', 'Also To <to2@example.com>'],
            bcc=['bcc1@example.com', 'Also BCC <bcc2@example.com>'],
            cc=['cc1@example.com', 'Also CC <cc2@example.com>'],
            headers={'Reply-To': 'another@example.com',
                     'X-MyHeader': 'my value',
                     'Message-ID': '<mycustommsgid@sales.example.com>'})  # should override backend msgid
        email.send()
        data = self.get_api_call_json()
        self.assertEqual(data['sender'], {'email': "from@example.com"})
        self.assertEqual(data['subject'], "Subject")
        self.assertEqual(data['textContent'], "Body goes here")
        self.assertEqual(data['replyTo'], {'email': "another@example.com"})
        self.assertEqual(data['headers'], {
            'X-MyHeader': "my value",
            'Message-ID': "<mycustommsgid@sales.example.com>",
        })

    def test_html_message(self):
        text_content = 'This is an important message.'
        html_content = '<p>This is an <strong>important</strong> message.</p>'
        email = mail.EmailMultiAlternatives('Subject', text_content,
                                            'from@example.com', ['to@example.com'])
        email.attach_alternative(html_content, "text/html")
        email.send()
        data = self.get_api_call_json()
        self.assertEqual(data['textContent'], text_content)
        self.assertEqual(data['htmlContent'], html_content)

        # Don't accidentally send the html part as an attachment:
        self.assertNotIn('attachments', data)

    def test_html_only_message(self):
        html_content = '<p>This is an <strong>important</strong> message.</p>'
        email = mail.EmailMessage('Subject', html_content, 'from@example.com', ['to@example.com'])
        email.content_subtype = "html"  # Main content is now text/html
        email.send()
        data = self.get_api_call_json()
        self.assertEqual(data['htmlContent'], html_content)
        self.assertNotIn('textContent', data)

    def test_extra_headers(self):
        self.message.extra_headers = {'X-Custom': 'string', 'X-Num': 123, 'X-Long': longtype(123),
                                      'Reply-To': '"Do Not Reply" <noreply@example.com>'}
        self.message.send()
        data = self.get_api_call_json()
        self.assertEqual(data['headers']['X-Custom'], 'string')
        self.assertEqual(data['headers']['X-Num'], 123)
        self.assertEqual(data['headers']['X-Long'], 123)
        # Reply-To must be moved to separate param
        self.assertNotIn('Reply-To', data['headers'])
        self.assertEqual(data['replyTo'], {'name': "Do Not Reply", 'email': "noreply@example.com"})

    def test_extra_headers_serialization_error(self):
        self.message.extra_headers = {'X-Custom': Decimal(12.5)}
        with self.assertRaisesMessage(AnymailSerializationError, "Decimal"):
            self.message.send()

    def test_reply_to(self):
        self.message.reply_to = ['"Reply recipient" <reply@example.com']
        self.message.send()
        data = self.get_api_call_json()
        self.assertEqual(data['replyTo'], {'name': "Reply recipient", 'email': "reply@example.com"})

    def test_multiple_reply_to(self):
        # SendinBlue v3 only allows a single reply address
        self.message.reply_to = ['"Reply recipient" <reply@example.com', 'reply2@example.com']
        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    @override_settings(ANYMAIL_IGNORE_UNSUPPORTED_FEATURES=True)
    def test_multiple_reply_to_ignore_unsupported(self):
        # Should use first Reply-To if ignoring unsupported features
        self.message.reply_to = ['"Reply recipient" <reply@example.com', 'reply2@example.com']
        self.message.send()
        data = self.get_api_call_json()
        self.assertEqual(data['replyTo'], {'name': "Reply recipient", 'email': "reply@example.com"})

    def test_attachments(self):
        text_content = "* Item one\n* Item two\n* Item three"
        self.message.attach(filename="test.txt", content=text_content, mimetype="text/plain")

        # Should guess mimetype if not provided...
        png_content = b"PNG\xb4 pretend this is the contents of a png file"
        self.message.attach(filename="test.png", content=png_content)

        # Should work with a MIMEBase object (also tests no filename)...
        pdf_content = b"PDF\xb4 pretend this is valid pdf data"
        mimeattachment = MIMEBase('application', 'pdf')
        mimeattachment.set_payload(pdf_content)
        self.message.attach(mimeattachment)

        self.message.send()
        data = self.get_api_call_json()
        self.assertEqual(len(data['attachment']), 3)

        attachments = data['attachment']
        self.assertEqual(attachments[0], {
            'name': "test.txt",
            'content': b64encode(text_content.encode('utf-8')).decode('ascii')})
        self.assertEqual(attachments[1], {
            'name': "test.png",
            'content': b64encode(png_content).decode('ascii')})
        self.assertEqual(attachments[2], {
            'name': "",
            'content': b64encode(pdf_content).decode('ascii')})

    def test_unicode_attachment_correctly_decoded(self):
        self.message.attach(u"Une pièce jointe.html", u'<p>\u2019</p>', mimetype='text/html')
        self.message.send()
        attachment = self.get_api_call_json()['attachment'][0]
        self.assertEqual(attachment['name'], u'Une pièce jointe.html')
        self.assertEqual(b64decode(attachment['content']).decode('utf-8'), u'<p>\u2019</p>')

    def test_embedded_images(self):
        # SendinBlue doesn't support inline image
        # inline image are just added as a content attachment

        image_filename = SAMPLE_IMAGE_FILENAME
        image_path = sample_image_path(image_filename)

        cid = attach_inline_image_file(self.message, image_path)  # Read from a png file
        html_content = '<p>This has an <img src="cid:%s" alt="inline" /> image.</p>' % cid
        self.message.attach_alternative(html_content, "text/html")

        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_attached_images(self):
        image_filename = SAMPLE_IMAGE_FILENAME
        image_path = sample_image_path(image_filename)
        image_data = sample_image_content(image_filename)

        self.message.attach_file(image_path)  # option 1: attach as a file

        image = MIMEImage(image_data)  # option 2: construct the MIMEImage and attach it directly
        self.message.attach(image)

        self.message.send()

        image_data_b64 = b64encode(image_data).decode('ascii')
        data = self.get_api_call_json()
        self.assertEqual(data['attachment'][0], {
            'name': image_filename,  # the named one
            'content': image_data_b64,
        })
        self.assertEqual(data['attachment'][1], {
            'name': '',  # the unnamed one
            'content': image_data_b64,
        })

    def test_multiple_html_alternatives(self):
        self.message.body = "Text body"
        self.message.attach_alternative("<p>First html is OK</p>", "text/html")
        self.message.attach_alternative("<p>And maybe second html, too</p>", "text/html")

        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_non_html_alternative(self):
        self.message.body = "Text body"
        self.message.attach_alternative("{'maybe': 'allowed'}", "application/json")

        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_api_failure(self):
        self.set_mock_response(status_code=400)
        with self.assertRaisesMessage(AnymailAPIError, "SendinBlue API response 400"):
            mail.send_mail('Subject', 'Body', 'from@example.com', ['to@example.com'])

        # Make sure fail_silently is respected
        self.set_mock_response(status_code=400)
        sent = mail.send_mail('Subject', 'Body', 'from@example.com', ['to@example.com'], fail_silently=True)
        self.assertEqual(sent, 0)

    def test_api_error_includes_details(self):
        """AnymailAPIError should include ESP's error message"""
        # JSON error response:
        error_response = b"""{
            "code": "invalid_parameter",
            "message": "valid sender email required"
        }"""
        self.set_mock_response(status_code=400, raw=error_response)
        with self.assertRaises(AnymailAPIError) as cm:
            self.message.send()
        err = cm.exception
        self.assertIn("code", str(err))
        self.assertIn("message", str(err))

        # No content in the error response:
        self.set_mock_response(status_code=502, raw=None)
        with self.assertRaises(AnymailAPIError):
            self.message.send()


class SendinBlueBackendAnymailFeatureTests(SendinBlueBackendMockAPITestCase):
    """Test backend support for Anymail added features"""

    def test_envelope_sender(self):
        # SendinBlue does not have a way to change envelope sender.
        self.message.envelope_sender = "anything@bounces.example.com"
        with self.assertRaisesMessage(AnymailUnsupportedFeature, 'envelope_sender'):
            self.message.send()

    def test_metadata(self):
        self.message.metadata = {'user_id': "12345", 'items': 6, 'float': 98.6, 'long': longtype(123)}
        self.message.send()

        data = self.get_api_call_json()

        metadata = json.loads(data['headers']['X-Mailin-custom'])
        self.assertEqual(metadata['user_id'], "12345")
        self.assertEqual(metadata['items'], 6)
        self.assertEqual(metadata['float'], 98.6)
        self.assertEqual(metadata['long'], longtype(123))

    def test_send_at(self):
        utc_plus_6 = get_fixed_timezone(6 * 60)
        utc_minus_8 = get_fixed_timezone(-8 * 60)

        with override_current_timezone(utc_plus_6):
            # Timezone-aware datetime converted to UTC:
            self.message.send_at = datetime(2016, 3, 4, 5, 6, 7, tzinfo=utc_minus_8)

            with self.assertRaises(AnymailUnsupportedFeature):
                self.message.send()

    def test_tag(self):
        self.message.tags = ["receipt"]
        self.message.send()
        data = self.get_api_call_json()
        self.assertCountEqual(data['headers']["X-Mailin-tag"], "receipt")

    def test_multiple_tags(self):
        self.message.tags = ["receipt", "repeat-user"]
        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_tracking(self):
        # Test one way...
        self.message.track_clicks = False
        self.message.track_opens = True

        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

        # ...and the opposite way
        self.message.track_clicks = True
        self.message.track_opens = False
        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_template_id(self):
        # subject, body, and from_email must be None for SendinBlue template send:
        message = mail.EmailMessage(
            subject=None,
            body=None,
            # recipient and reply_to display names are not allowed
            to=['alice@example.com'],  # single 'to' recommended (all 'to' get the same message)
            cc=['cc1@example.com', 'cc2@example.com'],
            bcc=['bcc@example.com'],
            reply_to=['reply@example.com'],
        )
        message.from_email = None  # from_email must be cleared after constructing EmailMessage

        message.template_id = 12  # SendinBlue uses per-account numeric ID to identify templates
        message.merge_global_data = {
            'buttonUrl': 'https://example.com',
        }

        message.send()

        # Template API call uses different endpoint and payload format from normal send:
        self.assert_esp_called('/v3/smtp/templates/12/send')
        data = self.get_api_call_json()
        self.assertEqual(data['emailTo'], ["alice@example.com"])
        self.assertEqual(data['emailCc'], ["cc1@example.com", "cc2@example.com"])
        self.assertEqual(data['emailBcc'], ["bcc@example.com"])
        self.assertEqual(data['replyTo'], 'reply@example.com')
        self.assertEqual(data['attributes'], {'buttonUrl': 'https://example.com'})

        # Make sure these normal-send parameters didn't get left in:
        self.assertNotIn('to', data)
        self.assertNotIn('cc', data)
        self.assertNotIn('bcc', data)
        self.assertNotIn('sender', data)
        self.assertNotIn('subject', data)
        self.assertNotIn('textContent', data)
        self.assertNotIn('htmlContent', data)

    def test_unsupported_template_overrides(self):
        # SendinBlue doesn't allow overriding any template headers/content
        message = mail.EmailMessage(to=['to@example.com'])
        message.template_id = "9"

        message.from_email = "from@example.com"
        with self.assertRaisesMessage(AnymailUnsupportedFeature, "overriding template from_email"):
            message.send()
        message.from_email = None

        message.subject = "nope, can't change template subject"
        with self.assertRaisesMessage(AnymailUnsupportedFeature, "overriding template subject"):
            message.send()
        message.subject = None

        message.body = "nope, can't change text body"
        with self.assertRaisesMessage(AnymailUnsupportedFeature, "overriding template body content"):
            message.send()
        message.content_subtype = "html"
        with self.assertRaisesMessage(AnymailUnsupportedFeature, "overriding template body content"):
            message.send()
        message.body = None

    def test_unsupported_template_display_names(self):
        # SendinBlue doesn't support display names in template recipients or reply-to
        message = mail.EmailMessage()
        message.from_email = None
        message.template_id = "9"

        message.to = ["Recipient <to@example.com>"]
        with self.assertRaisesMessage(AnymailUnsupportedFeature, "display names in to when sending with a template"):
            message.send()
        message.to = ["to@example.com"]

        message.cc = ["Recipient <cc@example.com>"]
        with self.assertRaisesMessage(AnymailUnsupportedFeature, "display names in cc when sending with a template"):
            message.send()
        message.cc = []

        message.bcc = ["Recipient <bcc@example.com>"]
        with self.assertRaisesMessage(AnymailUnsupportedFeature, "display names in bcc when sending with a template"):
            message.send()
        message.bcc = []

        message.reply_to = ["Reply-To <reply@example.com>"]
        with self.assertRaisesMessage(AnymailUnsupportedFeature,
                                      "display names in reply_to when sending with a template"):
            message.send()
        message.reply_to = []

    def test_merge_data(self):
        self.message.merge_data = {
            'alice@example.com': {':name': "Alice", ':group': "Developers"},
            'bob@example.com': {':name': "Bob"},  # and leave :group undefined
        }
        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_default_omits_options(self):
        """Make sure by default we don't send any ESP-specific options.

        Options not specified by the caller should be omitted entirely from
        the API call (*not* sent as False or empty). This ensures
        that your ESP account settings apply by default.
        """
        self.message.send()
        data = self.get_api_call_json()
        self.assertNotIn('attachment', data)
        self.assertNotIn('tag', data)
        self.assertNotIn('headers', data)
        self.assertNotIn('replyTo', data)
        self.assertNotIn('atributes', data)

    def test_esp_extra(self):
        self.message.tags = ["tag"]
        # SendinBlue doesn't offer any esp-extra but we will test
        # with some extra of SendGrid to see if it's work in the future
        self.message.esp_extra = {
            'ip_pool_name': "transactional",
            'asm': {  # subscription management
                'group_id': 1,
            },
            'tracking_settings': {
                'subscription_tracking': {
                        'enable': True,
                        'substitution_tag': '[unsubscribe_url]',
                },
            },
        }
        self.message.send()
        data = self.get_api_call_json()
        # merged from esp_extra:
        self.assertEqual(data['ip_pool_name'], "transactional")
        self.assertEqual(data['asm'], {'group_id': 1})
        self.assertEqual(data['tracking_settings']['subscription_tracking'],
                         {'enable': True, 'substitution_tag': "[unsubscribe_url]"})
        # make sure we didn't overwrite Anymail message options:
        self.assertEqual(data['headers']["X-Mailin-tag"], "tag")

    # noinspection PyUnresolvedReferences
    def test_send_attaches_anymail_status(self):
        """ The anymail_status should be attached to the message when it is sent """
        # the DEFAULT_RAW_RESPONSE above is the *only* success response SendinBlue returns,
        # so no need to override it here
        msg = mail.EmailMessage('Subject', 'Message', 'from@example.com', ['to1@example.com'],)
        sent = msg.send()
        self.assertEqual(sent, 1)
        self.assertEqual(msg.anymail_status.status, {'queued'})
        self.assertEqual(msg.anymail_status.recipients['to1@example.com'].status, 'queued')
        self.assertEqual(msg.anymail_status.esp_response.content, self.DEFAULT_RAW_RESPONSE)

        self.assertEqual(
            msg.anymail_status.message_id,
            json.loads(msg.anymail_status.esp_response.content.decode('utf-8'))['messageId']
        )
        self.assertEqual(
            msg.anymail_status.recipients['to1@example.com'].message_id,
            json.loads(msg.anymail_status.esp_response.content.decode('utf-8'))['messageId']
        )

    # noinspection PyUnresolvedReferences
    def test_send_failed_anymail_status(self):
        """ If the send fails, anymail_status should contain initial values"""
        self.set_mock_response(status_code=500)
        sent = self.message.send(fail_silently=True)
        self.assertEqual(sent, 0)
        self.assertIsNone(self.message.anymail_status.status)
        self.assertEqual(self.message.anymail_status.recipients, {})
        self.assertIsNone(self.message.anymail_status.esp_response)

    def test_json_serialization_errors(self):
        """Try to provide more information about non-json-serializable data"""
        self.message.esp_extra = {'total': Decimal('19.99')}
        with self.assertRaises(AnymailSerializationError) as cm:
            self.message.send()
        err = cm.exception
        self.assertIsInstance(err, TypeError)  # compatibility with json.dumps
        self.assertIn("Don't know how to send this data to SendinBlue", str(err))  # our added context
        self.assertRegex(str(err), r"Decimal.*is not JSON serializable")  # original message


class SendinBlueBackendRecipientsRefusedTests(SendinBlueBackendMockAPITestCase):
    """Should raise AnymailRecipientsRefused when *all* recipients are rejected or invalid"""

    # SendinBlue doesn't check email bounce or complaint lists at time of send --
    # it always just queues the message. You'll need to listen for the "rejected"
    # and "failed" events to detect refused recipients.
    pass  # not applicable to this backend


class SendinBlueBackendSessionSharingTestCase(SessionSharingTestCasesMixin, SendinBlueBackendMockAPITestCase):
    """Requests session sharing tests"""
    pass  # tests are defined in the mixin


@override_settings(EMAIL_BACKEND="anymail.backends.sendinblue.EmailBackend")
class SendinBlueBackendImproperlyConfiguredTests(SimpleTestCase, AnymailTestMixin):
    """Test ESP backend without required settings in place"""

    def test_missing_auth(self):
        with self.assertRaisesRegex(AnymailConfigurationError, r'\bSENDINBLUE_API_KEY\b'):
            mail.send_mail('Subject', 'Message', 'from@example.com', ['to@example.com'])