from types import SimpleNamespace
from typing import Dict
from unittest.mock import MagicMock, patch

from django.http import HttpRequest

from zerver.decorator import webhook_view
from zerver.lib.actions import do_rename_stream
from zerver.lib.exceptions import InvalidJSONError, JsonableError
from zerver.lib.send_email import FromAddress
from zerver.lib.test_classes import WebhookTestCase, ZulipTestCase
from zerver.lib.test_helpers import HostRequestMock
from zerver.lib.users import get_api_key
from zerver.lib.webhooks.common import (
    INVALID_JSON_MESSAGE,
    MISSING_EVENT_HEADER_MESSAGE,
    MissingHTTPEventHeader,
    get_fixture_http_headers,
    standardize_headers,
    validate_extract_webhook_http_header,
)
from zerver.models import UserProfile, get_realm, get_user


class WebhooksCommonTestCase(ZulipTestCase):
    def test_webhook_http_header_header_exists(self) -> None:
        webhook_bot = get_user("webhook-bot@zulip.com", get_realm("zulip"))
        request = HostRequestMock()
        request.META["HTTP_X_CUSTOM_HEADER"] = "custom_value"
        request.user = webhook_bot

        header_value = validate_extract_webhook_http_header(
            request, "X_CUSTOM_HEADER", "test_webhook"
        )

        self.assertEqual(header_value, "custom_value")

    def test_webhook_http_header_header_does_not_exist(self) -> None:
        realm = get_realm("zulip")
        webhook_bot = get_user("webhook-bot@zulip.com", realm)
        webhook_bot.last_reminder = None
        notification_bot = self.notification_bot(realm)
        request = HostRequestMock()
        request.user = webhook_bot
        request.path = "some/random/path"

        exception_msg = "Missing the HTTP event header 'X_CUSTOM_HEADER'"
        with self.assertRaisesRegex(MissingHTTPEventHeader, exception_msg):
            validate_extract_webhook_http_header(request, "X_CUSTOM_HEADER", "test_webhook")

        msg = self.get_last_message()
        expected_message = MISSING_EVENT_HEADER_MESSAGE.format(
            bot_name=webhook_bot.full_name,
            request_path=request.path,
            header_name="X_CUSTOM_HEADER",
            integration_name="test_webhook",
            support_email=FromAddress.SUPPORT,
        ).rstrip()
        self.assertEqual(msg.sender.id, notification_bot.id)
        self.assertEqual(msg.content, expected_message)

    def test_notify_bot_owner_on_invalid_json(self) -> None:
        @webhook_view("ClientName", notify_bot_owner_on_invalid_json=False)
        def my_webhook_no_notify(request: HttpRequest, user_profile: UserProfile) -> None:
            raise InvalidJSONError("Malformed JSON")

        @webhook_view("ClientName", notify_bot_owner_on_invalid_json=True)
        def my_webhook_notify(request: HttpRequest, user_profile: UserProfile) -> None:
            raise InvalidJSONError("Malformed JSON")

        webhook_bot_email = "webhook-bot@zulip.com"
        webhook_bot_realm = get_realm("zulip")
        webhook_bot = get_user(webhook_bot_email, webhook_bot_realm)
        webhook_bot_api_key = get_api_key(webhook_bot)
        request = HostRequestMock()
        request.POST["api_key"] = webhook_bot_api_key
        request.host = "zulip.testserver"
        expected_msg = INVALID_JSON_MESSAGE.format(webhook_name="ClientName")

        last_message_id = self.get_last_message().id
        with self.assertRaisesRegex(JsonableError, "Malformed JSON"):
            my_webhook_no_notify(request)

        # First verify that without the setting, it doesn't send a PM to bot owner.
        msg = self.get_last_message()
        self.assertEqual(msg.id, last_message_id)
        self.assertNotEqual(msg.content, expected_msg.strip())

        # Then verify that with the setting, it does send such a message.
        with self.assertRaisesRegex(JsonableError, "Malformed JSON"):
            my_webhook_notify(request)
        msg = self.get_last_message()
        self.assertNotEqual(msg.id, last_message_id)
        self.assertEqual(msg.sender.id, self.notification_bot(webhook_bot_realm).id)
        self.assertEqual(msg.content, expected_msg.strip())

    @patch("zerver.lib.webhooks.common.importlib.import_module")
    def test_get_fixture_http_headers_for_success(self, import_module_mock: MagicMock) -> None:
        def fixture_to_headers(fixture_name: str) -> Dict[str, str]:
            # A sample function which would normally perform some
            # extra operations before returning a dictionary
            # corresponding to the fixture name passed. For this test,
            # we just return a fixed dictionary.
            return {"key": "value"}

        fake_module = SimpleNamespace(fixture_to_headers=fixture_to_headers)
        import_module_mock.return_value = fake_module

        headers = get_fixture_http_headers("some_integration", "complex_fixture")
        self.assertEqual(headers, {"key": "value"})

    def test_get_fixture_http_headers_for_non_existant_integration(self) -> None:
        headers = get_fixture_http_headers("some_random_nonexistant_integration", "fixture_name")
        self.assertEqual(headers, {})

    @patch("zerver.lib.webhooks.common.importlib.import_module")
    def test_get_fixture_http_headers_with_no_fixtures_to_headers_function(
        self,
        import_module_mock: MagicMock,
    ) -> None:

        fake_module = SimpleNamespace()
        import_module_mock.return_value = fake_module

        self.assertEqual(
            get_fixture_http_headers("some_integration", "simple_fixture"),
            {},
        )

    def test_standardize_headers(self) -> None:
        self.assertEqual(standardize_headers({}), {})

        raw_headers = {"Content-Type": "text/plain", "X-Event-Type": "ping"}
        djangoified_headers = standardize_headers(raw_headers)
        expected_djangoified_headers = {"CONTENT_TYPE": "text/plain", "HTTP_X_EVENT_TYPE": "ping"}
        self.assertEqual(djangoified_headers, expected_djangoified_headers)


class WebhookURLConfigurationTestCase(WebhookTestCase):
    STREAM_NAME = "helloworld"
    WEBHOOK_DIR_NAME = "helloworld"
    URL_TEMPLATE = "/api/v1/external/helloworld?stream={stream}&api_key={api_key}"

    def setUp(self) -> None:
        super().setUp()
        stream = self.subscribe(self.test_user, self.STREAM_NAME)

        # In actual webhook tests, we will not need to use stream id.
        # We assign stream id to STREAM_NAME for testing URL configuration only.
        self.STREAM_NAME = str(stream.id)
        do_rename_stream(stream, "helloworld_renamed", self.test_user)

        self.url = self.build_webhook_url()

    def test_trigger_stream_message_by_id(self) -> None:
        # check_webhook cannot be used here as it
        # subscribes the test user to self.STREAM_NAME
        payload = self.get_body("hello")

        self.send_webhook_payload(
            self.test_user, self.url, payload, content_type="application/json"
        )

        expected_topic = "Hello World"
        expected_message = "Hello! I am happy to be here! :smile:\nThe Wikipedia featured article for today is **[Marilyn Monroe](https://en.wikipedia.org/wiki/Marilyn_Monroe)**"

        msg = self.get_last_message()
        self.assert_stream_message(
            message=msg,
            stream_name="helloworld_renamed",
            topic_name=expected_topic,
            content=expected_message,
        )


class MissingEventHeaderTestCase(WebhookTestCase):
    STREAM_NAME = "groove"
    URL_TEMPLATE = "/api/v1/external/groove?stream={stream}&api_key={api_key}"

    # This tests the validate_extract_webhook_http_header function with
    # an actual webhook, instead of just making a mock
    def test_missing_event_header(self) -> None:
        self.subscribe(self.test_user, self.STREAM_NAME)
        result = self.client_post(
            self.url,
            self.get_body("ticket_state_changed"),
            content_type="application/x-www-form-urlencoded",
        )
        self.assert_json_error(result, "Missing the HTTP event header 'X_GROOVE_EVENT'")

        realm = get_realm("zulip")
        webhook_bot = get_user("webhook-bot@zulip.com", realm)
        webhook_bot.last_reminder = None
        notification_bot = self.notification_bot(realm)
        msg = self.get_last_message()
        expected_message = MISSING_EVENT_HEADER_MESSAGE.format(
            bot_name=webhook_bot.full_name,
            request_path="/api/v1/external/groove",
            header_name="X_GROOVE_EVENT",
            integration_name="Groove",
            support_email=FromAddress.SUPPORT,
        ).rstrip()
        if msg.sender.id != notification_bot.id:  # nocoverage
            # This block seems to fire occasionally; debug output:
            print(msg)
            print(msg.content)
        self.assertEqual(msg.sender.id, notification_bot.id)
        self.assertEqual(msg.content, expected_message)

    def get_body(self, fixture_name: str) -> str:
        return self.webhook_fixture_data("groove", fixture_name, file_type="json")
