import sys
import weakref
from inspect import isawaitable

from sentry_sdk._compat import urlparse, reraise
from sentry_sdk.hub import Hub
from sentry_sdk.utils import (
    capture_internal_exceptions,
    event_from_exception,
    HAS_REAL_CONTEXTVARS,
)
from sentry_sdk.integrations import Integration
from sentry_sdk.integrations._wsgi_common import RequestExtractor, _filter_headers
from sentry_sdk.integrations.logging import ignore_logger

from sanic import Sanic, __version__ as VERSION  # type: ignore
from sanic.exceptions import SanicException  # type: ignore
from sanic.router import Router  # type: ignore
from sanic.handlers import ErrorHandler  # type: ignore

from sentry_sdk._types import MYPY

if MYPY:
    from typing import Any
    from typing import Callable
    from typing import Optional
    from typing import Union
    from typing import Tuple

    from sanic.request import Request, RequestParameters  # type: ignore

    from sentry_sdk._types import Event, EventProcessor, Hint


class SanicIntegration(Integration):
    identifier = "sanic"

    @staticmethod
    def setup_once():
        # type: () -> None
        if not HAS_REAL_CONTEXTVARS:
            # We better have contextvars or we're going to leak state between
            # requests.
            raise RuntimeError(
                "The sanic integration for Sentry requires Python 3.7+ "
                " or aiocontextvars package"
            )

        if VERSION.startswith("0.8."):
            # Sanic 0.8 and older creates a logger named "root" and puts a
            # stringified version of every exception in there (without exc_info),
            # which our error deduplication can't detect.
            #
            # We explicitly check the version here because it is a very
            # invasive step to ignore this logger and not necessary in newer
            # versions at all.
            #
            # https://github.com/huge-success/sanic/issues/1332
            ignore_logger("root")

        old_handle_request = Sanic.handle_request

        async def sentry_handle_request(self, request, *args, **kwargs):
            # type: (Any, Request, *Any, **Any) -> Any
            hub = Hub.current
            if hub.get_integration(SanicIntegration) is None:
                return old_handle_request(self, request, *args, **kwargs)

            weak_request = weakref.ref(request)

            with Hub(hub) as hub:
                with hub.configure_scope() as scope:
                    scope.clear_breadcrumbs()
                    scope.add_event_processor(_make_request_processor(weak_request))

                response = old_handle_request(self, request, *args, **kwargs)
                if isawaitable(response):
                    response = await response

                return response

        Sanic.handle_request = sentry_handle_request

        old_router_get = Router.get

        def sentry_router_get(self, request):
            # type: (Any, Request) -> Any
            rv = old_router_get(self, request)
            hub = Hub.current
            if hub.get_integration(SanicIntegration) is not None:
                with capture_internal_exceptions():
                    with hub.configure_scope() as scope:
                        scope.transaction = rv[0].__name__
            return rv

        Router.get = sentry_router_get

        old_error_handler_lookup = ErrorHandler.lookup

        def sentry_error_handler_lookup(self, exception):
            # type: (Any, Exception) -> Optional[Callable]
            _capture_exception(exception)
            old_error_handler = old_error_handler_lookup(self, exception)

            if old_error_handler is None:
                return None

            if Hub.current.get_integration(SanicIntegration) is None:
                return old_error_handler

            async def sentry_wrapped_error_handler(request, exception):
                # type: (Request, Exception) -> Any
                try:
                    response = old_error_handler(request, exception)
                    if isawaitable(response):
                        response = await response
                    return response
                except Exception:
                    # Report errors that occur in Sanic error handler. These
                    # exceptions will not even show up in Sanic's
                    # `sanic.exceptions` logger.
                    exc_info = sys.exc_info()
                    _capture_exception(exc_info)
                    reraise(*exc_info)

            return sentry_wrapped_error_handler

        ErrorHandler.lookup = sentry_error_handler_lookup


def _capture_exception(exception):
    # type: (Union[Tuple[Optional[type], Optional[BaseException], Any], BaseException]) -> None
    hub = Hub.current
    integration = hub.get_integration(SanicIntegration)
    if integration is None:
        return

    # If an integration is there, a client has to be there.
    client = hub.client  # type: Any

    with capture_internal_exceptions():
        event, hint = event_from_exception(
            exception,
            client_options=client.options,
            mechanism={"type": "sanic", "handled": False},
        )
        hub.capture_event(event, hint=hint)


def _make_request_processor(weak_request):
    # type: (Callable[[], Request]) -> EventProcessor
    def sanic_processor(event, hint):
        # type: (Event, Optional[Hint]) -> Optional[Event]

        try:
            if hint and issubclass(hint["exc_info"][0], SanicException):
                return None
        except KeyError:
            pass

        request = weak_request()
        if request is None:
            return event

        with capture_internal_exceptions():
            extractor = SanicRequestExtractor(request)
            extractor.extract_into_event(event)

            request_info = event["request"]
            urlparts = urlparse.urlsplit(request.url)

            request_info["url"] = "%s://%s%s" % (
                urlparts.scheme,
                urlparts.netloc,
                urlparts.path,
            )

            request_info["query_string"] = urlparts.query
            request_info["method"] = request.method
            request_info["env"] = {"REMOTE_ADDR": request.remote_addr}
            request_info["headers"] = _filter_headers(dict(request.headers))

        return event

    return sanic_processor


class SanicRequestExtractor(RequestExtractor):
    def content_length(self):
        # type: () -> int
        if self.request.body is None:
            return 0
        return len(self.request.body)

    def cookies(self):
        return dict(self.request.cookies)

    def raw_data(self):
        # type: () -> bytes
        return self.request.body

    def form(self):
        # type: () -> RequestParameters
        return self.request.form

    def is_json(self):
        raise NotImplementedError()

    def json(self):
        # type: () -> Optional[Any]
        return self.request.json

    def files(self):
        # type: () -> RequestParameters
        return self.request.files

    def size_of_file(self, file):
        return len(file.body or ())
