#
# Licensed to the Apache Software Foundation (ASF) under one
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# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

from __future__ import annotations

import inspect
import logging
from collections.abc import AsyncIterator, Awaitable, Callable
from typing import TYPE_CHECKING, Any, Generic, Protocol, TypeVar, cast

from typing_extensions import ParamSpec

if TYPE_CHECKING:
    from structlog.typing import FilteringBoundLogger as Logger

    from airflow.sdk.types import OutletEventAccessorsProtocol

P = ParamSpec("P")
R = TypeVar("R")


class _ExecutionCallableRunner(Generic[P, R]):
    @staticmethod
    def run(*args: P.args, **kwargs: P.kwargs) -> R: ...  # type: ignore[empty-body]


class _AsyncExecutionCallableRunner(Generic[P, R]):
    @staticmethod
    async def run(*args: P.args, **kwargs: P.kwargs) -> R: ...  # type: ignore[empty-body]


class ExecutionCallableRunner(Protocol):
    def __call__(
        self,
        func: Callable[P, R],
        outlet_events: OutletEventAccessorsProtocol,
        *,
        logger: logging.Logger | Logger,
    ) -> _ExecutionCallableRunner[P, R]: ...


class AsyncExecutionCallableRunner(Protocol):
    def __call__(
        self,
        func: Callable[P, R],
        outlet_events: OutletEventAccessorsProtocol,
        *,
        logger: logging.Logger | Logger,
    ) -> _AsyncExecutionCallableRunner[P, R]: ...


def create_executable_runner(
    func: Callable[P, R],
    outlet_events: OutletEventAccessorsProtocol,
    *,
    logger: logging.Logger | Logger,
) -> _ExecutionCallableRunner[P, R]:
    """
    Run an execution callable against a task context and given arguments.

    If the callable is a simple function, this simply calls it with the supplied
    arguments (including the context). If the callable is a generator function,
    the generator is exhausted here, with the yielded values getting fed back
    into the task context automatically for execution.

    This convoluted implementation of inner class with closure is so *all*
    arguments passed to ``run()`` can be forwarded to the wrapped function. This
    is particularly important for the argument "self", which some use cases
    need to receive. This is not possible if this is implemented as a normal
    class, where "self" needs to point to the runner object, not the object
    bounded to the inner callable.

    :meta private:
    """

    class _ExecutionCallableRunnerImpl(_ExecutionCallableRunner):
        @staticmethod
        def run(*args: P.args, **kwargs: P.kwargs) -> R:
            from airflow.sdk.definitions.asset.metadata import Metadata

            if not inspect.isgeneratorfunction(func):
                return func(*args, **kwargs)

            result: R

            if isinstance(logger, logging.Logger):

                def _warn_unknown(metadata):
                    logger.warning("Ignoring unknown data of %r received from task", type(metadata))
                    logger.debug("Full yielded value: %r", metadata)
            else:

                def _warn_unknown(metadata):
                    logger.warning("Ignoring unknown type received from task", type=type(metadata))
                    logger.debug("Full yielded value", metadata=metadata)

            def _run():
                nonlocal result
                result = yield from func(*args, **kwargs)

            for metadata in _run():
                if isinstance(metadata, Metadata):
                    outlet_events[metadata.asset].extra.update(metadata.extra)
                    if metadata.alias:
                        outlet_events[metadata.alias].add(metadata.asset, extra=metadata.extra)
                else:
                    _warn_unknown(metadata)

            return result

    return cast("_ExecutionCallableRunner[P, R]", _ExecutionCallableRunnerImpl)


def create_async_executable_runner(
    func: Callable[P, Awaitable[R] | AsyncIterator],
    outlet_events: OutletEventAccessorsProtocol,
    *,
    logger: logging.Logger | Logger,
) -> _AsyncExecutionCallableRunner[P, R]:
    """
    Run an async execution callable against a task context and given arguments.

    If the callable is a simple function, this simply calls it with the supplied
    arguments (including the context). If the callable is a generator function,
    the generator is exhausted here, with the yielded values getting fed back
    into the task context automatically for execution.

    This convoluted implementation of inner class with closure is so *all*
    arguments passed to ``run()`` can be forwarded to the wrapped function. This
    is particularly important for the argument "self", which some use cases
    need to receive. This is not possible if this is implemented as a normal
    class, where "self" needs to point to the runner object, not the object
    bounded to the inner callable.

    :meta private:
    """

    class _AsyncExecutionCallableRunnerImpl(_AsyncExecutionCallableRunner):
        @staticmethod
        async def run(*args: P.args, **kwargs: P.kwargs) -> R:
            from airflow.sdk.definitions.asset.metadata import Metadata

            if not inspect.isasyncgenfunction(func):
                result = cast("Awaitable[R]", func(*args, **kwargs))
                return await result

            results: list[Any] = []

            async for result in func(*args, **kwargs):
                if isinstance(result, Metadata):
                    outlet_events[result.asset].extra.update(result.extra)
                    if result.alias:
                        outlet_events[result.alias].add(result.asset, extra=result.extra)

                results.append(result)

            return cast("R", results)

    return cast("_AsyncExecutionCallableRunner[P, R]", _AsyncExecutionCallableRunnerImpl)
