"""本模块定义了依赖注入的各类参数。

FrontMatter:
    sidebar_position: 4
    description: nonebot.params 模块
"""

import asyncio
import inspect
import warnings
from typing_extensions import Literal
from typing import Any, Dict, List, Tuple, Callable, Optional, cast
from contextlib import AsyncExitStack, contextmanager, asynccontextmanager

from pydantic.fields import Required, Undefined, ModelField

from nonebot.log import logger
from nonebot.exception import TypeMisMatch
from nonebot.adapters import Bot, Event, Message
from nonebot.dependencies.utils import check_field_type
from nonebot.dependencies import Param, Dependent, CustomConfig
from nonebot.typing import T_State, T_Handler, T_DependencyCache
from nonebot.consts import (
    CMD_KEY,
    PREFIX_KEY,
    REGEX_DICT,
    SHELL_ARGS,
    SHELL_ARGV,
    CMD_ARG_KEY,
    RAW_CMD_KEY,
    REGEX_GROUP,
    REGEX_MATCHED,
)
from nonebot.utils import (
    get_name,
    run_sync,
    is_gen_callable,
    run_sync_ctx_manager,
    is_async_gen_callable,
    is_coroutine_callable,
    generic_check_issubclass,
)


class DependsInner:
    def __init__(
        self,
        dependency: Optional[T_Handler] = None,
        *,
        use_cache: bool = True,
    ) -> None:
        self.dependency = dependency
        self.use_cache = use_cache

    def __repr__(self) -> str:
        dep = get_name(self.dependency)
        cache = "" if self.use_cache else ", use_cache=False"
        return f"{self.__class__.__name__}({dep}{cache})"


def Depends(
    dependency: Optional[T_Handler] = None,
    *,
    use_cache: bool = True,
) -> Any:
    """子依赖装饰器

    参数:
        dependency: 依赖函数。默认为参数的类型注释。
        use_cache: 是否使用缓存。默认为 `True`。

    用法:
        ```python
        def depend_func() -> Any:
            return ...

        def depend_gen_func():
            try:
                yield ...
            finally:
                ...

        async def handler(param_name: Any = Depends(depend_func), gen: Any = Depends(depend_gen_func)):
            ...
        ```
    """
    return DependsInner(dependency, use_cache=use_cache)


class DependParam(Param):
    """子依赖参数"""

    @classmethod
    def _check_param(
        cls,
        dependent: Dependent,
        name: str,
        param: inspect.Parameter,
    ) -> Optional["DependParam"]:
        if isinstance(param.default, DependsInner):
            dependency: T_Handler
            if param.default.dependency is None:
                assert param.annotation is not param.empty, "Dependency cannot be empty"
                dependency = param.annotation
            else:
                dependency = param.default.dependency
            sub_dependent = Dependent[Any].parse(
                call=dependency,
                allow_types=dependent.allow_types,
            )
            dependent.pre_checkers.extend(sub_dependent.pre_checkers)
            sub_dependent.pre_checkers.clear()
            return cls(
                Required, use_cache=param.default.use_cache, dependent=sub_dependent
            )

    @classmethod
    def _check_parameterless(
        cls, dependent: "Dependent", value: Any
    ) -> Optional["Param"]:
        if isinstance(value, DependsInner):
            assert value.dependency, "Dependency cannot be empty"
            dependent = Dependent[Any].parse(
                call=value.dependency, allow_types=dependent.allow_types
            )
            return cls(Required, use_cache=value.use_cache, dependent=dependent)

    async def _solve(
        self,
        stack: Optional[AsyncExitStack] = None,
        dependency_cache: Optional[T_DependencyCache] = None,
        **kwargs: Any,
    ) -> Any:
        use_cache: bool = self.extra["use_cache"]
        dependency_cache = {} if dependency_cache is None else dependency_cache

        sub_dependent: Dependent = self.extra["dependent"]
        sub_dependent.call = cast(Callable[..., Any], sub_dependent.call)
        call = sub_dependent.call

        # solve sub dependency with current cache
        sub_values = await sub_dependent.solve(
            stack=stack,
            dependency_cache=dependency_cache,
            **kwargs,
        )

        # run dependency function
        task: asyncio.Task[Any]
        if use_cache and call in dependency_cache:
            solved = await dependency_cache[call]
        elif is_gen_callable(call) or is_async_gen_callable(call):
            assert isinstance(
                stack, AsyncExitStack
            ), "Generator dependency should be called in context"
            if is_gen_callable(call):
                cm = run_sync_ctx_manager(contextmanager(call)(**sub_values))
            else:
                cm = asynccontextmanager(call)(**sub_values)
            task = asyncio.create_task(stack.enter_async_context(cm))
            dependency_cache[call] = task
            solved = await task
        elif is_coroutine_callable(call):
            task = asyncio.create_task(call(**sub_values))
            dependency_cache[call] = task
            solved = await task
        else:
            task = asyncio.create_task(run_sync(call)(**sub_values))
            dependency_cache[call] = task
            solved = await task

        return solved


class _BotChecker(Param):
    async def _solve(self, bot: Bot, **kwargs: Any) -> Any:
        field: ModelField = self.extra["field"]
        try:
            return check_field_type(field, bot)
        except TypeMisMatch:
            logger.debug(
                f"Bot type {type(bot)} not match "
                f"annotation {field._type_display()}, ignored"
            )
            raise


class BotParam(Param):
    """{ref}`nonebot.adapters._bot.Bot` 参数"""

    @classmethod
    def _check_param(
        cls, dependent: Dependent, name: str, param: inspect.Parameter
    ) -> Optional["BotParam"]:
        if param.default == param.empty:
            if generic_check_issubclass(param.annotation, Bot):
                if param.annotation is not Bot:
                    dependent.pre_checkers.append(
                        _BotChecker(
                            Required,
                            field=ModelField(
                                name=name,
                                type_=param.annotation,
                                class_validators=None,
                                model_config=CustomConfig,
                                default=None,
                                required=True,
                            ),
                        )
                    )
                return cls(Required)
            elif param.annotation == param.empty and name == "bot":
                return cls(Required)

    async def _solve(self, bot: Bot, **kwargs: Any) -> Any:
        return bot


class _EventChecker(Param):
    async def _solve(self, event: Event, **kwargs: Any) -> Any:
        field: ModelField = self.extra["field"]
        try:
            return check_field_type(field, event)
        except TypeMisMatch:
            logger.debug(
                f"Event type {type(event)} not match "
                f"annotation {field._type_display()}, ignored"
            )
            raise


class EventParam(Param):
    """{ref}`nonebot.adapters._event.Event` 参数"""

    @classmethod
    def _check_param(
        cls, dependent: Dependent, name: str, param: inspect.Parameter
    ) -> Optional["EventParam"]:
        if param.default == param.empty:
            if generic_check_issubclass(param.annotation, Event):
                if param.annotation is not Event:
                    dependent.pre_checkers.append(
                        _EventChecker(
                            Required,
                            field=ModelField(
                                name=name,
                                type_=param.annotation,
                                class_validators=None,
                                model_config=CustomConfig,
                                default=None,
                                required=True,
                            ),
                        )
                    )
                return cls(Required)
            elif param.annotation == param.empty and name == "event":
                return cls(Required)

    async def _solve(self, event: Event, **kwargs: Any) -> Any:
        return event


async def _event_type(event: Event) -> str:
    return event.get_type()


def EventType() -> str:
    """{ref}`nonebot.adapters._event.Event` 类型参数"""
    return Depends(_event_type)


async def _event_message(event: Event) -> Message:
    return event.get_message()


def EventMessage() -> Any:
    """{ref}`nonebot.adapters._event.Event` 消息参数"""
    return Depends(_event_message)


async def _event_plain_text(event: Event) -> str:
    return event.get_plaintext()


def EventPlainText() -> str:
    """{ref}`nonebot.adapters._event.Event` 纯文本消息参数"""
    return Depends(_event_plain_text)


async def _event_to_me(event: Event) -> bool:
    return event.is_tome()


def EventToMe() -> bool:
    """{ref}`nonebot.adapters._event.Event` `to_me` 参数"""
    return Depends(_event_to_me)


class StateInner(T_State):
    ...


def State() -> T_State:
    """**Deprecated**: 事件处理状态参数，请直接使用 {ref}`nonebot.typing.T_State`"""
    warnings.warn("State() is deprecated, use `T_State` instead", DeprecationWarning)
    return StateInner()


class StateParam(Param):
    """事件处理状态参数"""

    @classmethod
    def _check_param(
        cls, dependent: Dependent, name: str, param: inspect.Parameter
    ) -> Optional["StateParam"]:
        if isinstance(param.default, StateInner):
            return cls(Required)
        elif param.default == param.empty:
            if param.annotation is T_State:
                return cls(Required)
            elif param.annotation == param.empty and name == "state":
                return cls(Required)

    async def _solve(self, state: T_State, **kwargs: Any) -> Any:
        return state


def _command(state: T_State) -> Message:
    return state[PREFIX_KEY][CMD_KEY]


def Command() -> Tuple[str, ...]:
    """消息命令元组"""
    return Depends(_command)


def _raw_command(state: T_State) -> Message:
    return state[PREFIX_KEY][RAW_CMD_KEY]


def RawCommand() -> str:
    """消息命令文本"""
    return Depends(_raw_command)


def _command_arg(state: T_State) -> Message:
    return state[PREFIX_KEY][CMD_ARG_KEY]


def CommandArg() -> Any:
    """消息命令参数"""
    return Depends(_command_arg)


def _shell_command_args(state: T_State) -> Any:
    return state[SHELL_ARGS]


def ShellCommandArgs():
    """shell 命令解析后的参数字典"""
    return Depends(_shell_command_args, use_cache=False)


def _shell_command_argv(state: T_State) -> List[str]:
    return state[SHELL_ARGV]


def ShellCommandArgv() -> Any:
    """shell 命令原始参数列表"""
    return Depends(_shell_command_argv, use_cache=False)


def _regex_matched(state: T_State) -> str:
    return state[REGEX_MATCHED]


def RegexMatched() -> str:
    """正则匹配结果"""
    return Depends(_regex_matched, use_cache=False)


def _regex_group(state: T_State):
    return state[REGEX_GROUP]


def RegexGroup() -> Tuple[Any, ...]:
    """正则匹配结果 group 元组"""
    return Depends(_regex_group, use_cache=False)


def _regex_dict(state: T_State):
    return state[REGEX_DICT]


def RegexDict() -> Dict[str, Any]:
    """正则匹配结果 group 字典"""
    return Depends(_regex_dict, use_cache=False)


class MatcherParam(Param):
    """事件响应器实例参数"""

    @classmethod
    def _check_param(
        cls, dependent: Dependent, name: str, param: inspect.Parameter
    ) -> Optional["MatcherParam"]:
        if generic_check_issubclass(param.annotation, Matcher) or (
            param.annotation == param.empty and name == "matcher"
        ):
            return cls(Required)

    async def _solve(self, matcher: "Matcher", **kwargs: Any) -> Any:
        return matcher


def Received(id: Optional[str] = None, default: Any = None) -> Any:
    """`receive` 事件参数"""

    def _received(matcher: "Matcher"):
        return matcher.get_receive(id or "", default)

    return Depends(_received, use_cache=False)


def LastReceived(default: Any = None) -> Any:
    """`last_receive` 事件参数"""

    def _last_received(matcher: "Matcher") -> Any:
        return matcher.get_last_receive(default)

    return Depends(_last_received, use_cache=False)


class ArgInner:
    def __init__(
        self, key: Optional[str], type: Literal["message", "str", "plaintext"]
    ) -> None:
        self.key = key
        self.type = type


def Arg(key: Optional[str] = None) -> Any:
    """`got` 的 Arg 参数消息"""
    return ArgInner(key, "message")


def ArgStr(key: Optional[str] = None) -> str:
    """`got` 的 Arg 参数消息文本"""
    return ArgInner(key, "str")  # type: ignore


def ArgPlainText(key: Optional[str] = None) -> str:
    """`got` 的 Arg 参数消息纯文本"""
    return ArgInner(key, "plaintext")  # type: ignore


class ArgParam(Param):
    """`got` 的 Arg 参数"""

    @classmethod
    def _check_param(
        cls, dependent: Dependent, name: str, param: inspect.Parameter
    ) -> Optional["ArgParam"]:
        if isinstance(param.default, ArgInner):
            return cls(Required, key=param.default.key or name, type=param.default.type)

    async def _solve(self, matcher: "Matcher", **kwargs: Any) -> Any:
        message = matcher.get_arg(self.extra["key"])
        if message is None:
            return message
        if self.extra["type"] == "message":
            return message
        elif self.extra["type"] == "str":
            return str(message)
        else:
            return message.extract_plain_text()


class ExceptionParam(Param):
    """`run_postprocessor` 的异常参数"""

    @classmethod
    def _check_param(
        cls, dependent: Dependent, name: str, param: inspect.Parameter
    ) -> Optional["ExceptionParam"]:
        if generic_check_issubclass(param.annotation, Exception) or (
            param.annotation == param.empty and name == "exception"
        ):
            return cls(Required)

    async def _solve(self, exception: Optional[Exception] = None, **kwargs: Any) -> Any:
        return exception


class DefaultParam(Param):
    """默认值参数"""

    @classmethod
    def _check_param(
        cls, dependent: Dependent, name: str, param: inspect.Parameter
    ) -> Optional["DefaultParam"]:
        if param.default != param.empty:
            return cls(param.default)

    async def _solve(self, **kwargs: Any) -> Any:
        return Undefined


from nonebot.matcher import Matcher

__autodoc__ = {
    "DependsInner": False,
    "StateInner": False,
    "ArgInner": False,
}