import functools
import inspect
import sys

import sentry_sdk
from sentry_sdk.consts import OP, SPANSTATUS
from sentry_sdk.integrations import DidNotEnable, Integration, _check_minimum_version
from sentry_sdk.traces import SegmentSource
from sentry_sdk.tracing import TransactionSource
from sentry_sdk.tracing_utils import has_span_streaming_enabled
from sentry_sdk.utils import (
    event_from_exception,
    logger,
    package_version,
    qualname_from_function,
    reraise,
)

try:
    import ray  # type: ignore[import-not-found]
    from ray import remote
except ImportError:
    raise DidNotEnable("Ray not installed.")

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from collections.abc import Callable
    from typing import Any, Optional

    from sentry_sdk.utils import ExcInfo


def _check_sentry_initialized() -> None:
    if sentry_sdk.get_client().is_active():
        return

    logger.debug(
        "[Tracing] Sentry not initialized in ray cluster worker, performance data will be discarded."
    )


def _insert_sentry_tracing_in_signature(func: "Callable[..., Any]") -> None:
    # Patching new_func signature to add the _sentry_tracing parameter to it
    # Ray later inspects the signature and finds the unexpected parameter otherwise
    signature = inspect.signature(func)
    params = list(signature.parameters.values())
    sentry_tracing_param = inspect.Parameter(
        "_sentry_tracing",
        kind=inspect.Parameter.KEYWORD_ONLY,
        default=None,
    )

    # Keyword only arguments are penultimate if function has variadic keyword arguments
    if params and params[-1].kind is inspect.Parameter.VAR_KEYWORD:
        params.insert(-1, sentry_tracing_param)
    else:
        params.append(sentry_tracing_param)

    func.__signature__ = signature.replace(parameters=params)  # type: ignore[attr-defined]


def _patch_ray_remote() -> None:
    old_remote = remote

    @functools.wraps(old_remote)
    def new_remote(
        f: "Optional[Callable[..., Any]]" = None, *args: "Any", **kwargs: "Any"
    ) -> "Callable[..., Any]":
        if inspect.isclass(f):
            # Ray Actors
            # (https://docs.ray.io/en/latest/ray-core/actors.html)
            # are not supported
            # (Only Ray Tasks are supported)
            return old_remote(f, *args, **kwargs)

        def wrapper(user_f: "Callable[..., Any]") -> "Any":
            if inspect.isclass(user_f):
                # Ray Actors
                # (https://docs.ray.io/en/latest/ray-core/actors.html)
                # are not supported
                # (Only Ray Tasks are supported)
                return old_remote(*args, **kwargs)(user_f)

            @functools.wraps(user_f)
            def new_func(
                *f_args: "Any",
                _sentry_tracing: "Optional[dict[str, Any]]" = None,
                **f_kwargs: "Any",
            ) -> "Any":
                _check_sentry_initialized()

                span_streaming = has_span_streaming_enabled(
                    sentry_sdk.get_client().options
                )
                if span_streaming:
                    sentry_sdk.traces.continue_trace(_sentry_tracing or {})

                    function_name = qualname_from_function(user_f)
                    with sentry_sdk.traces.start_span(
                        name="unknown Ray task"
                        if function_name is None
                        else function_name,
                        attributes={
                            "sentry.op": OP.QUEUE_TASK_RAY,
                            "sentry.origin": RayIntegration.origin,
                            "sentry.span.source": SegmentSource.TASK,
                        },
                        parent_span=None,
                    ):
                        try:
                            result = user_f(*f_args, **f_kwargs)
                        except Exception:
                            exc_info = sys.exc_info()
                            _capture_exception(exc_info)
                            reraise(*exc_info)

                        return result
                else:
                    transaction = sentry_sdk.continue_trace(
                        _sentry_tracing or {},
                        op=OP.QUEUE_TASK_RAY,
                        name=qualname_from_function(user_f),
                        origin=RayIntegration.origin,
                        source=TransactionSource.TASK,
                    )

                    with sentry_sdk.start_transaction(transaction) as transaction:
                        try:
                            result = user_f(*f_args, **f_kwargs)
                            transaction.set_status(SPANSTATUS.OK)
                        except Exception:
                            transaction.set_status(SPANSTATUS.INTERNAL_ERROR)
                            exc_info = sys.exc_info()
                            _capture_exception(exc_info)
                            reraise(*exc_info)

                        return result

            _insert_sentry_tracing_in_signature(new_func)

            if f:
                rv = old_remote(new_func)
            else:
                rv = old_remote(*args, **kwargs)(new_func)
            old_remote_method = rv.remote

            def _remote_method_with_header_propagation(
                *args: "Any", **kwargs: "Any"
            ) -> "Any":
                """
                Ray Client
                """
                span_streaming = has_span_streaming_enabled(
                    sentry_sdk.get_client().options
                )
                if span_streaming:
                    function_name = qualname_from_function(user_f)
                    with sentry_sdk.traces.start_span(
                        name="unknown Ray task"
                        if function_name is None
                        else function_name,
                        attributes={
                            "sentry.op": OP.QUEUE_SUBMIT_RAY,
                            "sentry.origin": RayIntegration.origin,
                        },
                    ):
                        tracing = {
                            k: v
                            for k, v in sentry_sdk.get_current_scope().iter_trace_propagation_headers()
                        }
                        try:
                            result = old_remote_method(
                                *args, **kwargs, _sentry_tracing=tracing
                            )
                        except Exception:
                            exc_info = sys.exc_info()
                            _capture_exception(exc_info)
                            reraise(*exc_info)

                        return result
                else:
                    with sentry_sdk.start_span(
                        op=OP.QUEUE_SUBMIT_RAY,
                        name=qualname_from_function(user_f),
                        origin=RayIntegration.origin,
                    ) as span:
                        tracing = {
                            k: v
                            for k, v in sentry_sdk.get_current_scope().iter_trace_propagation_headers()
                        }
                        try:
                            result = old_remote_method(
                                *args, **kwargs, _sentry_tracing=tracing
                            )
                            span.set_status(SPANSTATUS.OK)
                        except Exception:
                            span.set_status(SPANSTATUS.INTERNAL_ERROR)
                            exc_info = sys.exc_info()
                            _capture_exception(exc_info)
                            reraise(*exc_info)

                        return result

            rv.remote = _remote_method_with_header_propagation

            return rv

        if f is not None:
            return wrapper(f)
        else:
            return wrapper

    ray.remote = new_remote


def _capture_exception(exc_info: "ExcInfo", **kwargs: "Any") -> None:
    client = sentry_sdk.get_client()

    event, hint = event_from_exception(
        exc_info,
        client_options=client.options,
        mechanism={
            "handled": False,
            "type": RayIntegration.identifier,
        },
    )
    sentry_sdk.capture_event(event, hint=hint)


class RayIntegration(Integration):
    identifier = "ray"
    origin = f"auto.queue.{identifier}"

    @staticmethod
    def setup_once() -> None:
        version = package_version("ray")
        _check_minimum_version(RayIntegration, version)

        _patch_ray_remote()
