import tempfile
from datetime import datetime, timedelta, timezone
from unittest.mock import patch

import ldap
import orjson
from django.core import mail
from django.core.mail.message import EmailMultiAlternatives
from django.test import override_settings
from django.utils.timezone import now as timezone_now
from django_auth_ldap.config import LDAPSearch

from zerver.actions.users import do_change_user_role
from zerver.lib.email_notifications import (
    enqueue_welcome_emails,
    get_onboarding_email_schedule,
    send_account_registered_email,
)
from zerver.lib.send_email import deliver_scheduled_emails, send_custom_email
from zerver.lib.test_classes import ZulipTestCase
from zerver.models import (
    Realm,
    ScheduledEmail,
    UserProfile,
    get_realm,
)


class TestCustomEmails(ZulipTestCase):
    def test_send_custom_email_argument(self) -> None:
        hamlet = self.example_user("hamlet")
        email_subject = "subject_test"
        reply_to = "reply_to_test"
        from_name = "from_name_test"

        with tempfile.NamedTemporaryFile() as markdown_template:
            markdown_template.write(b"# Some heading\n\nSome content\n{{ realm_name }}")
            markdown_template.flush()
            send_custom_email(
                [hamlet],
                options={
                    "markdown_template_path": markdown_template.name,
                    "reply_to": reply_to,
                    "subject": email_subject,
                    "from_name": from_name,
                    "dry_run": False,
                },
            )
        self.assert_length(mail.outbox, 1)
        msg = mail.outbox[0]
        self.assertEqual(msg.subject, email_subject)
        self.assert_length(msg.reply_to, 1)
        self.assertEqual(msg.reply_to[0], reply_to)
        self.assertNotIn("{% block content %}", msg.body)
        self.assertIn("# Some heading", msg.body)
        self.assertIn("Zulip Dev", msg.body)
        self.assertNotIn("{{ realm_name }}", msg.body)
        self.assertNotIn("</div>", msg.body)

        assert isinstance(msg, EmailMultiAlternatives)
        self.assertIn("Some heading</h1>", str(msg.alternatives[0][0]))
        self.assertNotIn("{{ realm_name }}", str(msg.alternatives[0][0]))

    def test_send_custom_email_remote_server(self) -> None:
        email_subject = "subject_test"
        reply_to = "reply_to_test"
        from_name = "from_name_test"
        contact_email = "zulip-admin@example.com"
        markdown_template_path = "templates/corporate/policies/index.md"
        send_custom_email(
            [],
            target_emails=[contact_email],
            options={
                "markdown_template_path": markdown_template_path,
                "reply_to": reply_to,
                "subject": email_subject,
                "from_name": from_name,
                "dry_run": False,
            },
        )
        self.assert_length(mail.outbox, 1)
        msg = mail.outbox[0]
        self.assertEqual(msg.subject, email_subject)
        self.assertEqual(msg.to, [contact_email])
        self.assert_length(msg.reply_to, 1)
        self.assertEqual(msg.reply_to[0], reply_to)
        self.assertNotIn("{% block content %}", msg.body)
        # Verify that the HTML version contains the footer.
        assert isinstance(msg, EmailMultiAlternatives)
        self.assertIn(
            "You are receiving this email to update you about important changes to Zulip",
            str(msg.alternatives[0][0]),
        )

    def test_send_custom_email_headers(self) -> None:
        hamlet = self.example_user("hamlet")
        markdown_template_path = (
            "zerver/tests/fixtures/email/custom_emails/email_base_headers_test.html"
        )
        send_custom_email(
            [hamlet],
            options={
                "markdown_template_path": markdown_template_path,
                "dry_run": False,
            },
        )
        self.assert_length(mail.outbox, 1)
        msg = mail.outbox[0]
        self.assertEqual(msg.subject, "Test subject")
        self.assertFalse(msg.reply_to)
        self.assertEqual("Test body", msg.body)

    def test_send_custom_email_no_argument(self) -> None:
        hamlet = self.example_user("hamlet")
        from_name = "from_name_test"
        email_subject = "subject_test"
        markdown_template_path = (
            "zerver/tests/fixtures/email/custom_emails/email_base_headers_no_headers_test.html"
        )

        from zerver.lib.send_email import NoEmailArgumentError

        self.assertRaises(
            NoEmailArgumentError,
            send_custom_email,
            [hamlet],
            options={
                "markdown_template_path": markdown_template_path,
                "from_name": from_name,
                "dry_run": False,
            },
        )

        self.assertRaises(
            NoEmailArgumentError,
            send_custom_email,
            [hamlet],
            options={
                "markdown_template_path": markdown_template_path,
                "subject": email_subject,
                "dry_run": False,
            },
        )

    def test_send_custom_email_doubled_arguments(self) -> None:
        hamlet = self.example_user("hamlet")
        from_name = "from_name_test"
        email_subject = "subject_test"
        markdown_template_path = (
            "zerver/tests/fixtures/email/custom_emails/email_base_headers_test.html"
        )

        from zerver.lib.send_email import DoubledEmailArgumentError

        self.assertRaises(
            DoubledEmailArgumentError,
            send_custom_email,
            [hamlet],
            options={
                "markdown_template_path": markdown_template_path,
                "subject": email_subject,
                "dry_run": False,
            },
        )

        self.assertRaises(
            DoubledEmailArgumentError,
            send_custom_email,
            [hamlet],
            options={
                "markdown_template_path": markdown_template_path,
                "from_name": from_name,
                "dry_run": False,
            },
        )

    def test_send_custom_email_admins_only(self) -> None:
        admin_user = self.example_user("hamlet")
        do_change_user_role(admin_user, UserProfile.ROLE_REALM_ADMINISTRATOR, acting_user=None)

        non_admin_user = self.example_user("cordelia")

        markdown_template_path = (
            "zerver/tests/fixtures/email/custom_emails/email_base_headers_test.html"
        )
        send_custom_email(
            [admin_user, non_admin_user],
            options={
                "markdown_template_path": markdown_template_path,
                "admins_only": True,
                "dry_run": False,
            },
        )
        self.assert_length(mail.outbox, 1)
        self.assertIn(admin_user.delivery_email, mail.outbox[0].to[0])

    def test_send_custom_email_dry_run(self) -> None:
        hamlet = self.example_user("hamlet")
        email_subject = "subject_test"
        reply_to = "reply_to_test"
        from_name = "from_name_test"
        markdown_template_path = "templates/zerver/tests/markdown/test_nested_code_blocks.md"
        with patch("builtins.print") as _:
            send_custom_email(
                [hamlet],
                options={
                    "markdown_template_path": markdown_template_path,
                    "reply_to": reply_to,
                    "subject": email_subject,
                    "from_name": from_name,
                    "dry_run": True,
                },
            )
            self.assert_length(mail.outbox, 0)


class TestFollowupEmails(ZulipTestCase):
    def test_day1_email_context(self) -> None:
        hamlet = self.example_user("hamlet")
        send_account_registered_email(hamlet)
        scheduled_emails = ScheduledEmail.objects.filter(users=hamlet).order_by(
            "scheduled_timestamp"
        )
        email_data = orjson.loads(scheduled_emails[0].data)
        self.assertEqual(email_data["context"]["email"], self.example_email("hamlet"))
        self.assertEqual(email_data["context"]["is_realm_admin"], False)
        self.assertEqual(
            email_data["context"]["getting_user_started_link"],
            "http://zulip.testserver/help/getting-started-with-zulip",
        )
        self.assertNotIn("ldap_username", email_data["context"])

        ScheduledEmail.objects.all().delete()

        iago = self.example_user("iago")
        send_account_registered_email(iago)
        scheduled_emails = ScheduledEmail.objects.filter(users=iago).order_by("scheduled_timestamp")
        email_data = orjson.loads(scheduled_emails[0].data)
        self.assertEqual(email_data["context"]["email"], self.example_email("iago"))
        self.assertEqual(email_data["context"]["is_realm_admin"], True)
        self.assertEqual(
            email_data["context"]["getting_organization_started_link"],
            "http://zulip.testserver/help/getting-your-organization-started-with-zulip",
        )
        self.assertEqual(
            email_data["context"]["getting_user_started_link"],
            "http://zulip.testserver/help/getting-started-with-zulip",
        )
        self.assertNotIn("ldap_username", email_data["context"])

    # See https://zulip.readthedocs.io/en/latest/production/authentication-methods.html#ldap-including-active-directory
    # for case details.
    @override_settings(
        AUTHENTICATION_BACKENDS=(
            "zproject.backends.ZulipLDAPAuthBackend",
            "zproject.backends.ZulipDummyBackend",
        ),
        # configure email search for email address in the uid attribute:
        AUTH_LDAP_REVERSE_EMAIL_SEARCH=LDAPSearch(
            "ou=users,dc=zulip,dc=com", ldap.SCOPE_ONELEVEL, "(uid=%(email)s)"
        ),
    )
    def test_day1_email_ldap_case_a_login_credentials(self) -> None:
        self.init_default_ldap_database()
        ldap_user_attr_map = {"full_name": "cn"}

        with self.settings(AUTH_LDAP_USER_ATTR_MAP=ldap_user_attr_map):
            self.login_with_return(
                "newuser_email_as_uid@zulip.com",
                self.ldap_password("newuser_email_as_uid@zulip.com"),
            )
            user = UserProfile.objects.get(delivery_email="newuser_email_as_uid@zulip.com")
            scheduled_emails = ScheduledEmail.objects.filter(users=user).order_by(
                "scheduled_timestamp"
            )

            self.assert_length(scheduled_emails, 3)
            email_data = orjson.loads(scheduled_emails[0].data)
            self.assertEqual(email_data["context"]["ldap"], True)
            self.assertEqual(
                email_data["context"]["ldap_username"], "newuser_email_as_uid@zulip.com"
            )

    @override_settings(
        AUTHENTICATION_BACKENDS=(
            "zproject.backends.ZulipLDAPAuthBackend",
            "zproject.backends.ZulipDummyBackend",
        )
    )
    def test_day1_email_ldap_case_b_login_credentials(self) -> None:
        self.init_default_ldap_database()
        ldap_user_attr_map = {"full_name": "cn"}

        with self.settings(
            LDAP_APPEND_DOMAIN="zulip.com",
            AUTH_LDAP_USER_ATTR_MAP=ldap_user_attr_map,
        ):
            self.login_with_return("newuser@zulip.com", self.ldap_password("newuser"))

            user = UserProfile.objects.get(delivery_email="newuser@zulip.com")
            scheduled_emails = ScheduledEmail.objects.filter(users=user).order_by(
                "scheduled_timestamp"
            )
            self.assert_length(scheduled_emails, 3)
            email_data = orjson.loads(scheduled_emails[0].data)
            self.assertEqual(email_data["context"]["ldap"], True)
            self.assertEqual(email_data["context"]["ldap_username"], "newuser")

    @override_settings(
        AUTHENTICATION_BACKENDS=(
            "zproject.backends.ZulipLDAPAuthBackend",
            "zproject.backends.ZulipDummyBackend",
        )
    )
    def test_day1_email_ldap_case_c_login_credentials(self) -> None:
        self.init_default_ldap_database()
        ldap_user_attr_map = {"full_name": "cn"}

        with self.settings(
            LDAP_EMAIL_ATTR="mail",
            AUTH_LDAP_USER_ATTR_MAP=ldap_user_attr_map,
        ):
            self.login_with_return("newuser_with_email", self.ldap_password("newuser_with_email"))
            user = UserProfile.objects.get(delivery_email="newuser_email@zulip.com")
            scheduled_emails = ScheduledEmail.objects.filter(users=user).order_by(
                "scheduled_timestamp"
            )
            self.assert_length(scheduled_emails, 3)
            email_data = orjson.loads(scheduled_emails[0].data)
            self.assertEqual(email_data["context"]["ldap"], True)
            self.assertEqual(email_data["context"]["ldap_username"], "newuser_with_email")

    def test_followup_emails_count(self) -> None:
        hamlet = self.example_user("hamlet")
        iago = self.example_user("iago")
        cordelia = self.example_user("cordelia")
        realm = get_realm("zulip")

        # Hamlet has account only in Zulip realm so day1, day2 and zulip_guide emails should be sent
        send_account_registered_email(self.example_user("hamlet"))
        enqueue_welcome_emails(self.example_user("hamlet"))
        scheduled_emails = ScheduledEmail.objects.filter(users=hamlet).order_by(
            "scheduled_timestamp"
        )
        self.assert_length(scheduled_emails, 3)
        self.assertEqual(
            orjson.loads(scheduled_emails[0].data)["template_prefix"], "zerver/emails/followup_day1"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[1].data)["template_prefix"], "zerver/emails/followup_day2"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[2].data)["template_prefix"],
            "zerver/emails/onboarding_zulip_guide",
        )

        ScheduledEmail.objects.all().delete()

        # The onboarding_zulip_guide email should not be sent to non-admin users in organizations
        # that are sent the `/for/communities/` guide; see note in enqueue_welcome_emails.
        realm.org_type = Realm.ORG_TYPES["community"]["id"]
        realm.save()

        # Hamlet is not an admin so the `/for/communities/` zulip_guide should not be sent
        send_account_registered_email(self.example_user("hamlet"))
        enqueue_welcome_emails(self.example_user("hamlet"))
        scheduled_emails = ScheduledEmail.objects.filter(users=hamlet).order_by(
            "scheduled_timestamp"
        )
        self.assert_length(scheduled_emails, 2)
        self.assertEqual(
            orjson.loads(scheduled_emails[0].data)["template_prefix"], "zerver/emails/followup_day1"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[1].data)["template_prefix"], "zerver/emails/followup_day2"
        )

        ScheduledEmail.objects.all().delete()

        # Iago is an admin so the `/for/communities/` zulip_guide should be sent
        send_account_registered_email(self.example_user("iago"))
        enqueue_welcome_emails(self.example_user("iago"))
        scheduled_emails = ScheduledEmail.objects.filter(users=iago).order_by("scheduled_timestamp")
        self.assert_length(scheduled_emails, 3)
        self.assertEqual(
            orjson.loads(scheduled_emails[0].data)["template_prefix"], "zerver/emails/followup_day1"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[1].data)["template_prefix"], "zerver/emails/followup_day2"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[2].data)["template_prefix"],
            "zerver/emails/onboarding_zulip_guide",
        )

        ScheduledEmail.objects.all().delete()

        # The organization_type context for "education_nonprofit" orgs is simplified to be "education"
        realm.org_type = Realm.ORG_TYPES["education_nonprofit"]["id"]
        realm.save()

        # Cordelia has account in more than 1 realm so day2 email should not be sent
        send_account_registered_email(self.example_user("cordelia"))
        enqueue_welcome_emails(self.example_user("cordelia"))
        scheduled_emails = ScheduledEmail.objects.filter(users=cordelia).order_by(
            "scheduled_timestamp"
        )
        self.assert_length(scheduled_emails, 2)
        self.assertEqual(
            orjson.loads(scheduled_emails[0].data)["template_prefix"], "zerver/emails/followup_day1"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[1].data)["template_prefix"],
            "zerver/emails/onboarding_zulip_guide",
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[1].data)["context"]["organization_type"],
            "education",
        )

        ScheduledEmail.objects.all().delete()

        # Only a subset of Realm.ORG_TYPES are sent the zulip_guide_followup email
        realm.org_type = Realm.ORG_TYPES["other"]["id"]
        realm.save()

        # In this case, Cordelia should only be sent the day1 email
        send_account_registered_email(self.example_user("cordelia"))
        enqueue_welcome_emails(self.example_user("cordelia"))
        scheduled_emails = ScheduledEmail.objects.filter(users=cordelia)
        self.assert_length(scheduled_emails, 1)
        self.assertEqual(
            orjson.loads(scheduled_emails[0].data)["template_prefix"], "zerver/emails/followup_day1"
        )

    def test_followup_emails_for_regular_realms(self) -> None:
        cordelia = self.example_user("cordelia")
        send_account_registered_email(self.example_user("cordelia"), realm_creation=True)
        enqueue_welcome_emails(self.example_user("cordelia"))
        scheduled_emails = ScheduledEmail.objects.filter(users=cordelia).order_by(
            "scheduled_timestamp"
        )
        assert scheduled_emails is not None
        self.assert_length(scheduled_emails, 2)
        self.assertEqual(
            orjson.loads(scheduled_emails[0].data)["template_prefix"], "zerver/emails/followup_day1"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[1].data)["template_prefix"],
            "zerver/emails/onboarding_zulip_guide",
        )

        deliver_scheduled_emails(scheduled_emails[0])
        from django.core.mail import outbox

        self.assert_length(outbox, 1)

        message = outbox[0]
        self.assertIn("you have created a new Zulip organization", message.body)
        self.assertNotIn("demo org", message.body)

    def test_followup_emails_for_demo_realms(self) -> None:
        cordelia = self.example_user("cordelia")
        cordelia.realm.demo_organization_scheduled_deletion_date = timezone_now() + timedelta(
            days=30
        )
        cordelia.realm.save()
        send_account_registered_email(self.example_user("cordelia"), realm_creation=True)
        enqueue_welcome_emails(self.example_user("cordelia"))
        scheduled_emails = ScheduledEmail.objects.filter(users=cordelia).order_by(
            "scheduled_timestamp"
        )
        assert scheduled_emails is not None
        self.assert_length(scheduled_emails, 2)
        self.assertEqual(
            orjson.loads(scheduled_emails[0].data)["template_prefix"], "zerver/emails/followup_day1"
        )
        self.assertEqual(
            orjson.loads(scheduled_emails[1].data)["template_prefix"],
            "zerver/emails/onboarding_zulip_guide",
        )

        deliver_scheduled_emails(scheduled_emails[0])
        from django.core.mail import outbox

        self.assert_length(outbox, 1)

        message = outbox[0]
        self.assertIn("you have created a new demo Zulip organization", message.body)

    def test_onboarding_zulip_guide_with_invalid_org_type(self) -> None:
        cordelia = self.example_user("cordelia")
        realm = get_realm("zulip")

        invalid_org_type_id = 999
        realm.org_type = invalid_org_type_id
        realm.save()

        with self.assertLogs(level="ERROR") as m:
            enqueue_welcome_emails(self.example_user("cordelia"))

        scheduled_emails = ScheduledEmail.objects.filter(users=cordelia)
        self.assert_length(scheduled_emails, 0)
        self.assertEqual(
            m.output,
            [f"ERROR:root:Unknown organization type '{invalid_org_type_id}'"],
        )


class TestFollowupEmailDelay(ZulipTestCase):
    def test_get_onboarding_email_schedule(self) -> None:
        user_profile = self.example_user("hamlet")
        dates_joined = {
            "Monday": datetime(2018, 1, 1, 1, 0, 0, 0, tzinfo=timezone.utc),
            "Tuesday": datetime(2018, 1, 2, 1, 0, 0, 0, tzinfo=timezone.utc),
            "Wednesday": datetime(2018, 1, 3, 1, 0, 0, 0, tzinfo=timezone.utc),
            "Thursday": datetime(2018, 1, 4, 1, 0, 0, 0, tzinfo=timezone.utc),
            "Friday": datetime(2018, 1, 5, 1, 0, 0, 0, tzinfo=timezone.utc),
            "Saturday": datetime(2018, 1, 6, 1, 0, 0, 0, tzinfo=timezone.utc),
            "Sunday": datetime(2018, 1, 7, 1, 0, 0, 0, tzinfo=timezone.utc),
        }
        days_delayed = {
            "2": timedelta(days=2, hours=-1),
            "4": timedelta(days=4, hours=-1),
            "6": timedelta(days=6, hours=-1),
        }

        # joined Monday
        user_profile.date_joined = dates_joined["Monday"]
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Wednesday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["2"],
        )
        self.assertEqual((dates_joined["Monday"] + days_delayed["2"]).isoweekday(), 3)

        # onboarding_zulip_guide sent on Friday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["4"],
        )
        self.assertEqual((dates_joined["Monday"] + days_delayed["4"]).isoweekday(), 5)

        # joined Tuesday
        user_profile.date_joined = dates_joined["Tuesday"]
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Thursday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["2"],
        )
        self.assertEqual((dates_joined["Tuesday"] + days_delayed["2"]).isoweekday(), 4)

        # onboarding_zulip_guide sent on Monday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["6"],
        )
        self.assertEqual((dates_joined["Tuesday"] + days_delayed["6"]).isoweekday(), 1)

        # joined Wednesday
        user_profile.date_joined = dates_joined["Wednesday"]
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Friday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["2"],
        )
        self.assertEqual((dates_joined["Wednesday"] + days_delayed["2"]).isoweekday(), 5)

        # onboarding_zulip_guide sent on Tuesday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["6"],
        )
        self.assertEqual((dates_joined["Wednesday"] + days_delayed["6"]).isoweekday(), 2)

        # joined Thursday
        user_profile.date_joined = dates_joined["Thursday"]
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Monday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["4"],
        )
        self.assertEqual((dates_joined["Thursday"] + days_delayed["4"]).isoweekday(), 1)

        # onboarding_zulip_guide sent on Wednesday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["6"],
        )
        self.assertEqual((dates_joined["Thursday"] + days_delayed["6"]).isoweekday(), 3)

        # joined Friday
        user_profile.date_joined = dates_joined["Friday"]
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Tuesday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["4"],
        )
        self.assertEqual((dates_joined["Friday"] + days_delayed["4"]).isoweekday(), 2)

        # onboarding_zulip_guide sent on Thursday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["6"],
        )
        self.assertEqual((dates_joined["Friday"] + days_delayed["6"]).isoweekday(), 4)

        # joined Saturday
        user_profile.date_joined = dates_joined["Saturday"]
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Monday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["2"],
        )
        self.assertEqual((dates_joined["Saturday"] + days_delayed["2"]).isoweekday(), 1)

        # onboarding_zulip_guide sent on Wednesday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["4"],
        )
        self.assertEqual((dates_joined["Saturday"] + days_delayed["4"]).isoweekday(), 3)

        # joined Sunday
        user_profile.date_joined = dates_joined["Sunday"]
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Tuesday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["2"],
        )
        self.assertEqual((dates_joined["Sunday"] + days_delayed["2"]).isoweekday(), 2)

        # onboarding_zulip_guide sent on Thursday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["4"],
        )
        self.assertEqual((dates_joined["Sunday"] + days_delayed["4"]).isoweekday(), 4)

        # Time offset of America/Phoenix is -07:00
        user_profile.timezone = "America/Phoenix"

        # Test date_joined == Friday in UTC, but Thursday in the user's time zone
        user_profile.date_joined = datetime(2018, 1, 5, 1, 0, 0, 0, tzinfo=timezone.utc)
        onboarding_email_schedule = get_onboarding_email_schedule(user_profile)

        # followup_day2 email sent on Monday
        self.assertEqual(
            onboarding_email_schedule["followup_day2"],
            days_delayed["4"],
        )

        # onboarding_zulip_guide sent on Wednesday
        self.assertEqual(
            onboarding_email_schedule["onboarding_zulip_guide"],
            days_delayed["6"],
        )


class TestCustomWelcomeEmailSender(ZulipTestCase):
    def test_custom_welcome_email_sender(self) -> None:
        name = "Nonreg Email"
        email = self.nonreg_email("test")
        with override_settings(
            WELCOME_EMAIL_SENDER={
                "name": name,
                "email": email,
            }
        ):
            hamlet = self.example_user("hamlet")
            enqueue_welcome_emails(hamlet)
            scheduled_emails = ScheduledEmail.objects.filter(users=hamlet).order_by(
                "scheduled_timestamp"
            )
            email_data = orjson.loads(scheduled_emails[0].data)
            self.assertEqual(email_data["from_name"], name)
            self.assertEqual(email_data["from_address"], email)