from unittest.mock import patch

from django.test import TestCase

from accounts.services import SMSDeliveryError

from .models import Notification
from .services import notify


class NotifyInAppChannelTests(TestCase):
    """
    channel='in_app' (پیش‌فرض) باید دقیقاً همون رفتارِ قبلیِ notify() رو
    داشته باشه: صرفاً یک Notification.objects.create ساده، بدونِ
    فراخوانیِ send_sms.
    """

    @patch('notifications.services.send_sms')
    def test_default_channel_creates_notification_and_does_not_send_sms(self, mock_send_sms):
        result = notify(user_id=1, type='order_paid', title='t', body='b', related_id=5)

        self.assertIsInstance(result, Notification)
        self.assertEqual(Notification.objects.count(), 1)
        notification = Notification.objects.get()
        self.assertEqual(notification.user_id, 1)
        self.assertEqual(notification.type, 'order_paid')
        self.assertEqual(notification.title, 't')
        self.assertEqual(notification.body, 'b')
        self.assertEqual(notification.related_id, 5)
        mock_send_sms.assert_not_called()

    @patch('notifications.services.send_sms')
    def test_explicit_in_app_channel_same_as_default(self, mock_send_sms):
        result = notify(user_id=2, type='xp_earned', title='t', channel='in_app')

        self.assertIsInstance(result, Notification)
        self.assertEqual(Notification.objects.count(), 1)
        mock_send_sms.assert_not_called()


class NotifySmsChannelTests(TestCase):
    """
    channel='sms' نباید هیچ Notificationی بسازه؛ فقط باید
    accounts.services.send_sms رو صدا بزنه (بدونِ تکرارِ منطقِ provider).
    """

    @patch('notifications.services.send_sms')
    def test_sms_channel_calls_send_sms_with_body_and_creates_no_notification(self, mock_send_sms):
        result = notify(
            user_id=3, type='order_paid', title='t', body='پیام پیامکی',
            channel='sms', phone='0910000000',
        )

        mock_send_sms.assert_called_once_with(phone='0910000000', message='پیام پیامکی')
        self.assertIsNone(result)
        self.assertEqual(Notification.objects.count(), 0)

    @patch('notifications.services.send_sms')
    def test_sms_channel_falls_back_to_title_when_body_empty(self, mock_send_sms):
        notify(user_id=3, type='order_paid', title='fallback-title', channel='sms', phone='0910000000')

        mock_send_sms.assert_called_once_with(phone='0910000000', message='fallback-title')

    def test_sms_channel_without_phone_raises_value_error(self):
        with self.assertRaises(ValueError):
            notify(user_id=3, type='order_paid', title='t', channel='sms')
        self.assertEqual(Notification.objects.count(), 0)

    @patch('notifications.services.send_sms')
    def test_sms_delivery_error_propagates_and_creates_no_notification(self, mock_send_sms):
        mock_send_sms.side_effect = SMSDeliveryError('boom')

        with self.assertRaises(SMSDeliveryError):
            notify(user_id=3, type='order_paid', title='t', channel='sms', phone='0910000000')
        self.assertEqual(Notification.objects.count(), 0)


class NotifyInvalidChannelTests(TestCase):
    def test_unsupported_channel_raises_value_error_and_creates_nothing(self):
        with self.assertRaises(ValueError):
            notify(user_id=3, type='order_paid', title='t', channel='email')
        self.assertEqual(Notification.objects.count(), 0)