from __future__ import annotations

import re
from collections.abc import AsyncGenerator, Awaitable, Callable
from typing import TYPE_CHECKING, Any

import docstring_parser

from astrbot.core import logger
from astrbot.core.agent.agent import Agent
from astrbot.core.agent.handoff import HandoffTool
from astrbot.core.agent.hooks import BaseAgentRunHooks
from astrbot.core.agent.tool import FunctionTool
from astrbot.core.message.message_event_result import MessageEventResult
from astrbot.core.provider.func_tool_manager import PY_TO_JSON_TYPE, SUPPORTED_TYPES
from astrbot.core.provider.register import llm_tools

if TYPE_CHECKING:
    from astrbot.core.astr_agent_context import AstrAgentContext

from ..filter.command import CommandFilter
from ..filter.command_group import CommandGroupFilter
from ..filter.custom_filter import CustomFilterAnd, CustomFilterOr
from ..filter.event_message_type import EventMessageType, EventMessageTypeFilter
from ..filter.permission import PermissionType, PermissionTypeFilter
from ..filter.platform_adapter_type import (
    PlatformAdapterType,
    PlatformAdapterTypeFilter,
)
from ..filter.regex import RegexFilter
from ..star_handler import EventType, StarHandlerMetadata, star_handlers_registry


def get_handler_full_name(
    awaitable: Callable[..., Awaitable[Any] | AsyncGenerator[Any]],
) -> str:
    """获取 Handler 的全名"""
    return f"{awaitable.__module__}_{awaitable.__name__}"


def get_handler_or_create(
    handler: Callable[
        ...,
        Awaitable[MessageEventResult | str | None]
        | AsyncGenerator[MessageEventResult | str | None],
    ],
    event_type: EventType,
    dont_add=False,
    **kwargs,
) -> StarHandlerMetadata:
    """获取 Handler 或者创建一个新的 Handler"""
    handler_full_name = get_handler_full_name(handler)
    md = star_handlers_registry.get_handler_by_full_name(handler_full_name)
    if md:
        return md
    md = StarHandlerMetadata(
        event_type=event_type,
        handler_full_name=handler_full_name,
        handler_name=handler.__name__,
        handler_module_path=handler.__module__,
        handler=handler,
        event_filters=[],
    )

    # 插件handler的附加额外信息
    if handler.__doc__:
        md.desc = handler.__doc__.strip()
    if "desc" in kwargs:
        md.desc = kwargs["desc"]
        del kwargs["desc"]
    md.extras_configs = kwargs

    if not dont_add:
        star_handlers_registry.append(md)
    return md


def register_command(
    command_name: str | None = None,
    sub_command: str | None = None,
    alias: set | None = None,
    **kwargs,
):
    """注册一个 Command."""
    new_command = None
    add_to_event_filters = False
    if isinstance(command_name, RegisteringCommandable):
        # 子指令
        if sub_command is not None:
            parent_command_names = (
                command_name.parent_group.get_complete_command_names()
            )
            new_command = CommandFilter(
                sub_command,
                alias,
                None,
                parent_command_names=parent_command_names,
            )
            command_name.parent_group.add_sub_command_filter(new_command)
        else:
            logger.warning(
                f"注册指令{command_name} 的子指令时未提供 sub_command 参数。",
            )
    # 裸指令
    elif command_name is None:
        logger.warning("注册裸指令时未提供 command_name 参数。")
    else:
        new_command = CommandFilter(command_name, alias, None)
        add_to_event_filters = True

    def decorator(awaitable):
        if not add_to_event_filters:
            kwargs["sub_command"] = (
                True  # 打一个标记，表示这是一个子指令，再 wakingstage 阶段这个 handler 将会直接被跳过（其父指令会接管）
            )
        handler_md = get_handler_or_create(
            awaitable,
            EventType.AdapterMessageEvent,
            **kwargs,
        )
        if new_command:
            new_command.init_handler_md(handler_md)
            handler_md.event_filters.append(new_command)
        return awaitable

    return decorator


def register_custom_filter(custom_type_filter, *args, **kwargs):
    """注册一个自定义的 CustomFilter

    Args:
        custom_type_filter: 在裸指令时为CustomFilter对象
                                        在指令组时为父指令的RegisteringCommandable对象，即self或者command_group的返回
        raise_error: 如果没有权限，是否抛出错误到消息平台，并且停止事件传播。默认为 True

    """
    add_to_event_filters = False
    raise_error = True

    # 判断是否是指令组，指令组则添加到指令组的CommandGroupFilter对象中在waking_check的时候一起判断
    if isinstance(custom_type_filter, RegisteringCommandable):
        # 子指令, 此时函数为RegisteringCommandable对象的方法，首位参数为RegisteringCommandable对象的self。
        parent_register_commandable = custom_type_filter
        custom_filter = args[0]
        if len(args) > 1:
            raise_error = args[1]
    else:
        # 裸指令
        add_to_event_filters = True
        custom_filter = custom_type_filter
        if args:
            raise_error = args[0]

    if not isinstance(custom_filter, (CustomFilterAnd, CustomFilterOr)):
        custom_filter = custom_filter(raise_error)

    def decorator(awaitable):
        # 裸指令，子指令与指令组的区分，指令组会因为标记跳过wake。
        if (
            not add_to_event_filters and isinstance(awaitable, RegisteringCommandable)
        ) or (add_to_event_filters and isinstance(awaitable, RegisteringCommandable)):
            # 指令组 与 根指令组，添加到本层的grouphandle中一起判断
            awaitable.parent_group.add_custom_filter(custom_filter)
        else:
            handler_md = get_handler_or_create(
                awaitable,
                EventType.AdapterMessageEvent,
                **kwargs,
            )

            if not add_to_event_filters and not isinstance(
                awaitable,
                RegisteringCommandable,
            ):
                # 底层子指令
                handle_full_name = get_handler_full_name(awaitable)
                for (
                    sub_handle
                ) in parent_register_commandable.parent_group.sub_command_filters:
                    if isinstance(sub_handle, CommandGroupFilter):
                        continue
                    # 所有符合fullname一致的子指令handle添加自定义过滤器。
                    # 不确定是否会有多个子指令有一样的fullname，比如一个方法添加多个command装饰器？
                    sub_handle_md = sub_handle.get_handler_md()
                    if (
                        sub_handle_md
                        and sub_handle_md.handler_full_name == handle_full_name
                    ):
                        sub_handle.add_custom_filter(custom_filter)

            else:
                # 裸指令
                # 确保运行时是可调用的 handler，针对类型检查器添加忽略
                assert isinstance(awaitable, Callable)
                handler_md = get_handler_or_create(
                    awaitable,
                    EventType.AdapterMessageEvent,
                    **kwargs,
                )
                handler_md.event_filters.append(custom_filter)

        return awaitable

    return decorator


def register_command_group(
    command_group_name: str | None = None,
    sub_command: str | None = None,
    alias: set | None = None,
    **kwargs,
):
    """注册一个 CommandGroup"""
    new_group = None
    if isinstance(command_group_name, RegisteringCommandable):
        # 子指令组
        if sub_command is None:
            logger.warning(f"{command_group_name} 指令组的子指令组 sub_command 未指定")
        else:
            new_group = CommandGroupFilter(
                sub_command,
                alias,
                parent_group=command_group_name.parent_group,
            )
            command_group_name.parent_group.add_sub_command_filter(new_group)
    # 根指令组
    elif command_group_name is None:
        logger.warning("根指令组的名称未指定")
    else:
        new_group = CommandGroupFilter(command_group_name, alias)

    def decorator(obj):
        if new_group:
            handler_md = get_handler_or_create(
                obj,
                EventType.AdapterMessageEvent,
                **kwargs,
            )
            handler_md.event_filters.append(new_group)

            return RegisteringCommandable(new_group)
        raise ValueError("注册指令组失败。")

    return decorator


class RegisteringCommandable:
    """用于指令组级联注册"""

    group: Callable[..., Callable[..., RegisteringCommandable]] = register_command_group
    command: Callable[..., Callable[..., None]] = register_command
    custom_filter: Callable[..., Callable[..., Any]] = register_custom_filter

    def __init__(self, parent_group: CommandGroupFilter) -> None:
        self.parent_group = parent_group


def register_event_message_type(event_message_type: EventMessageType, **kwargs):
    """注册一个 EventMessageType"""

    def decorator(awaitable):
        handler_md = get_handler_or_create(
            awaitable,
            EventType.AdapterMessageEvent,
            **kwargs,
        )
        handler_md.event_filters.append(EventMessageTypeFilter(event_message_type))
        return awaitable

    return decorator


def register_platform_adapter_type(
    platform_adapter_type: PlatformAdapterType,
    **kwargs,
):
    """注册一个 PlatformAdapterType"""

    def decorator(awaitable):
        handler_md = get_handler_or_create(awaitable, EventType.AdapterMessageEvent)
        handler_md.event_filters.append(
            PlatformAdapterTypeFilter(platform_adapter_type),
        )
        return awaitable

    return decorator


def register_regex(regex: str, **kwargs):
    """注册一个 Regex"""

    def decorator(awaitable):
        handler_md = get_handler_or_create(
            awaitable,
            EventType.AdapterMessageEvent,
            **kwargs,
        )
        handler_md.event_filters.append(RegexFilter(regex))
        return awaitable

    return decorator


def register_permission_type(permission_type: PermissionType, raise_error: bool = True):
    """注册一个 PermissionType

    Args:
        permission_type: PermissionType
        raise_error: 如果没有权限，是否抛出错误到消息平台，并且停止事件传播。默认为 True

    """

    def decorator(awaitable):
        handler_md = get_handler_or_create(awaitable, EventType.AdapterMessageEvent)
        handler_md.event_filters.append(
            PermissionTypeFilter(permission_type, raise_error),
        )
        return awaitable

    return decorator


def register_on_astrbot_loaded(**kwargs):
    """当 AstrBot 加载完成时"""

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnAstrBotLoadedEvent, **kwargs)
        return awaitable

    return decorator


def register_on_platform_loaded(**kwargs):
    """当平台加载完成时"""

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnPlatformLoadedEvent, **kwargs)
        return awaitable

    return decorator


def register_on_plugin_error(**kwargs):
    """当插件处理消息异常时触发。

    Hook 参数:
        event, plugin_name, handler_name, error, traceback_text

    说明:
        在 hook 中调用 `event.stop_event()` 可屏蔽默认报错回显，
        并由插件自行决定是否转发到其他会话。
    """

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnPluginErrorEvent, **kwargs)
        return awaitable

    return decorator


def register_on_plugin_loaded(**kwargs):
    """当有插件加载完成时

    Hook 参数:
        metadata

    说明:
        当有插件加载完成时，触发该事件并获取到该插件的元数据
    """

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnPluginLoadedEvent, **kwargs)
        return awaitable

    return decorator


def register_on_plugin_unloaded(**kwargs):
    """当有插件卸载完成时

    Hook 参数:
        metadata

    说明:
        当有插件卸载完成时，触发该事件并获取到该插件的元数据
    """

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnPluginUnloadedEvent, **kwargs)
        return awaitable

    return decorator


def register_on_waiting_llm_request(**kwargs):
    """当等待调用 LLM 时的通知事件（在获取锁之前）

    此钩子在消息确定要调用 LLM 但还未开始排队等锁时触发，
    适合用于发送"正在思考中..."等用户反馈提示。

    Examples:
    ```py
    @on_waiting_llm_request()
    async def on_waiting_llm(self, event: AstrMessageEvent) -> None:
        await event.send("🤔 正在思考中...")
    ```

    """

    def decorator(awaitable):
        _ = get_handler_or_create(
            awaitable, EventType.OnWaitingLLMRequestEvent, **kwargs
        )
        return awaitable

    return decorator


def register_on_llm_request(**kwargs):
    """当有 LLM 请求时的事件

    Examples:
    ```py
    from astrbot.api.provider import ProviderRequest

    @on_llm_request()
    async def test(self, event: AstrMessageEvent, request: ProviderRequest) -> None:
        request.system_prompt += "你是一个猫娘..."
    ```

    请务必接收两个参数：event, request

    """

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnLLMRequestEvent, **kwargs)
        return awaitable

    return decorator


def register_on_llm_response(**kwargs):
    """当有 LLM 请求后的事件

    Examples:
    ```py
    from astrbot.api.provider import LLMResponse

    @on_llm_response()
    async def test(self, event: AstrMessageEvent, response: LLMResponse) -> None:
        ...
    ```

    请务必接收两个参数：event, request

    """

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnLLMResponseEvent, **kwargs)
        return awaitable

    return decorator


def register_on_using_llm_tool(**kwargs):
    """当调用函数工具前的事件。
    会传入 tool 和 tool_args 参数。

    Examples:
    ```py
    from astrbot.core.agent.tool import FunctionTool

    @on_using_llm_tool()
    async def test(self, event: AstrMessageEvent, tool: FunctionTool, tool_args: dict | None) -> None:
        ...
    ```

    请务必接收三个参数：event, tool, tool_args

    """

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnUsingLLMToolEvent, **kwargs)
        return awaitable

    return decorator


def register_on_llm_tool_respond(**kwargs):
    """当调用函数工具后的事件。
    会传入 tool、tool_args 和 tool 的调用结果 tool_result 参数。

    Examples:
    ```py
    from astrbot.core.agent.tool import FunctionTool
    from mcp.types import CallToolResult

    @on_llm_tool_respond()
    async def test(self, event: AstrMessageEvent, tool: FunctionTool, tool_args: dict | None, tool_result: CallToolResult | None) -> None:
        ...
    ```

    请务必接收四个参数：event, tool, tool_args, tool_result

    """

    def decorator(awaitable):
        _ = get_handler_or_create(awaitable, EventType.OnLLMToolRespondEvent, **kwargs)
        return awaitable

    return decorator


def register_llm_tool(name: str | None = None, **kwargs):
    """为函数调用（function-calling / tools-use）添加工具。

    请务必按照以下格式编写一个工具（包括函数注释，AstrBot 会尝试解析该函数注释）

    ```
    @llm_tool(name="get_weather") # 如果 name 不填，将使用函数名
    async def get_weather(event: AstrMessageEvent, location: str):
        \'\'\'获取天气信息。

    Args:
            location(string): 地点
        \'\'\'
        # 处理逻辑
    ```

    可接受的参数类型有：string, number, object, array, boolean。

    返回值：
        - 返回 str：结果会被加入下一次 LLM 请求的 prompt 中，用于让 LLM 总结工具返回的结果
        - 返回 None：结果不会被加入下一次 LLM 请求的 prompt 中。

    可以使用 yield 发送消息、终止事件。

    发送消息：请参考文档。

    终止事件：
    ```
    event.stop_event()
    yield
    ```

    """
    name_ = name
    registering_agent = None
    if kwargs.get("registering_agent"):
        registering_agent = kwargs["registering_agent"]

    def decorator(
        awaitable: Callable[
            ...,
            AsyncGenerator[MessageEventResult | str | None]
            | Awaitable[MessageEventResult | str | None],
        ],
    ):
        llm_tool_name = name_ if name_ else awaitable.__name__
        func_doc = awaitable.__doc__ or ""
        docstring = docstring_parser.parse(func_doc)
        args = []
        for arg in docstring.params:
            sub_type_name = None
            type_name = arg.type_name
            if not type_name:
                raise ValueError(
                    f"LLM 函数工具 {awaitable.__module__}_{llm_tool_name} 的参数 {arg.arg_name} 缺少类型注释。",
                )
            # parse type_name to handle cases like "list[string]"
            match = re.match(r"(\w+)\[(\w+)\]", type_name)
            if match:
                type_name = match.group(1)
                sub_type_name = match.group(2)
            type_name = PY_TO_JSON_TYPE.get(type_name, type_name)
            if sub_type_name:
                sub_type_name = PY_TO_JSON_TYPE.get(sub_type_name, sub_type_name)
            if type_name not in SUPPORTED_TYPES or (
                sub_type_name and sub_type_name not in SUPPORTED_TYPES
            ):
                raise ValueError(
                    f"LLM 函数工具 {awaitable.__module__}_{llm_tool_name} 不支持的参数类型：{arg.type_name}",
                )

            arg_json_schema = {
                "type": type_name,
                "name": arg.arg_name,
                "description": arg.description,
            }
            if sub_type_name:
                if type_name == "array":
                    arg_json_schema["items"] = {"type": sub_type_name}
            args.append(arg_json_schema)

        if not registering_agent:
            doc_desc = docstring.description.strip() if docstring.description else ""
            md = get_handler_or_create(awaitable, EventType.OnCallingFuncToolEvent)
            llm_tools.add_func(llm_tool_name, args, doc_desc, md.handler)
        else:
            assert isinstance(registering_agent, RegisteringAgent)
            # print(f"Registering tool {llm_tool_name} for agent", registering_agent._agent.name)
            if registering_agent._agent.tools is None:
                registering_agent._agent.tools = []

            desc = docstring.description.strip() if docstring.description else ""
            tool = llm_tools.spec_to_func(llm_tool_name, args, desc, awaitable)
            registering_agent._agent.tools.append(tool)

        return awaitable

    return decorator


class RegisteringAgent:
    """用于 Agent 注册"""

    def llm_tool(self, *args, **kwargs):
        kwargs["registering_agent"] = self
        return register_llm_tool(*args, **kwargs)

    def __init__(self, agent: Agent[AstrAgentContext]) -> None:
        self._agent = agent


def register_agent(
    name: str,
    instruction: str,
    tools: list[str | FunctionTool] | None = None,
    run_hooks: BaseAgentRunHooks[AstrAgentContext] | None = None,
):
    """注册一个 Agent

    Args:
        name: Agent 的名称
        instruction: Agent 的指令
        tools: Agent 使用的工具列表
        run_hooks: Agent 运行时的钩子函数

    """
    tools_ = tools or []

    def decorator(awaitable: Callable[..., Awaitable[Any]]):
        AstrAgent = Agent[AstrAgentContext]
        agent = AstrAgent(
            name=name,
            instructions=instruction,
            tools=tools_,
            run_hooks=run_hooks or BaseAgentRunHooks[AstrAgentContext](),
        )
        handoff_tool = HandoffTool(agent=agent)
        handoff_tool.handler = awaitable
        llm_tools.func_list.append(handoff_tool)
        return RegisteringAgent(agent)

    return decorator


def register_on_decorating_result(**kwargs):
    """在发送消息前的事件"""

    def decorator(awaitable):
        _ = get_handler_or_create(
            awaitable,
            EventType.OnDecoratingResultEvent,
            **kwargs,
        )
        return awaitable

    return decorator


def register_after_message_sent(**kwargs):
    """在消息发送后的事件"""

    def decorator(awaitable):
        _ = get_handler_or_create(
            awaitable,
            EventType.OnAfterMessageSentEvent,
            **kwargs,
        )
        return awaitable

    return decorator