import threading

from sentry_sdk.consts import OP
from sentry_sdk.hub import Hub
from sentry_sdk._types import MYPY
from sentry_sdk import _functools

if MYPY:
    from typing import Any


try:
    from asyncio import iscoroutinefunction
except ImportError:
    iscoroutinefunction = None  # type: ignore


try:
    from sentry_sdk.integrations.django.asgi import wrap_async_view
except (ImportError, SyntaxError):
    wrap_async_view = None  # type: ignore


def patch_views():
    # type: () -> None

    from django.core.handlers.base import BaseHandler
    from django.template.response import SimpleTemplateResponse
    from sentry_sdk.integrations.django import DjangoIntegration

    old_make_view_atomic = BaseHandler.make_view_atomic
    old_render = SimpleTemplateResponse.render

    def sentry_patched_render(self):
        # type: (SimpleTemplateResponse) -> Any
        hub = Hub.current
        with hub.start_span(
            op=OP.VIEW_RESPONSE_RENDER, description="serialize response"
        ):
            return old_render(self)

    @_functools.wraps(old_make_view_atomic)
    def sentry_patched_make_view_atomic(self, *args, **kwargs):
        # type: (Any, *Any, **Any) -> Any
        callback = old_make_view_atomic(self, *args, **kwargs)

        # XXX: The wrapper function is created for every request. Find more
        # efficient way to wrap views (or build a cache?)

        hub = Hub.current
        integration = hub.get_integration(DjangoIntegration)

        if integration is not None and integration.middleware_spans:

            if (
                iscoroutinefunction is not None
                and wrap_async_view is not None
                and iscoroutinefunction(callback)
            ):
                sentry_wrapped_callback = wrap_async_view(hub, callback)
            else:
                sentry_wrapped_callback = _wrap_sync_view(hub, callback)

        else:
            sentry_wrapped_callback = callback

        return sentry_wrapped_callback

    SimpleTemplateResponse.render = sentry_patched_render
    BaseHandler.make_view_atomic = sentry_patched_make_view_atomic


def _wrap_sync_view(hub, callback):
    # type: (Hub, Any) -> Any
    @_functools.wraps(callback)
    def sentry_wrapped_callback(request, *args, **kwargs):
        # type: (Any, *Any, **Any) -> Any
        with hub.configure_scope() as sentry_scope:
            # set the active thread id to the handler thread for sync views
            # this isn't necessary for async views since that runs on main
            if sentry_scope.profile is not None:
                sentry_scope.profile.active_thread_id = threading.current_thread().ident

            with hub.start_span(
                op=OP.VIEW_RENDER, description=request.resolver_match.view_name
            ):
                return callback(request, *args, **kwargs)

    return sentry_wrapped_callback
