from __future__ import annotations

import typing
import pkgutil
import importlib
import traceback

from .. import loader, events, context, models, host
from ...core import entities as core_entities
from ...provider.tools import entities as tools_entities
from ...utils import funcschema


class PluginLoader(loader.PluginLoader):
    """加载 plugins/ 目录下的插件"""

    _current_pkg_path = ''

    _current_module_path = ''

    _current_container: context.RuntimeContainer = None

    containers: list[context.RuntimeContainer] = []

    async def initialize(self):
        """初始化"""
        setattr(models, 'register', self.register)
        setattr(models, 'on', self.on)
        setattr(models, 'func', self.func)

        setattr(context, 'register', self.register)
        setattr(context, 'handler', self.handler)
        setattr(context, 'llm_func', self.llm_func)

    def register(
        self,
        name: str,
        description: str,
        version: str,
        author: str
    ) -> typing.Callable[[typing.Type[context.BasePlugin]], typing.Type[context.BasePlugin]]:
        self.ap.logger.debug(f'注册插件 {name} {version} by {author}')
        container = context.RuntimeContainer(
            plugin_name=name,
            plugin_description=description,
            plugin_version=version,
            plugin_author=author,
            plugin_source='',
            pkg_path=self._current_pkg_path,
            main_file=self._current_module_path,
            event_handlers={},
            content_functions=[],
        )

        self._current_container = container

        def wrapper(cls: context.BasePlugin) -> typing.Type[context.BasePlugin]:
            container.plugin_class = cls
            return cls
        
        return wrapper

    # 过时
    # 最早将于 v3.4 版本移除
    def on(
        self,
        event: typing.Type[events.BaseEventModel]
    ) -> typing.Callable[[typing.Callable], typing.Callable]:
        """注册过时的事件处理器"""
        self.ap.logger.debug(f'注册事件处理器 {event.__name__}')
        def wrapper(func: typing.Callable) -> typing.Callable:
            
            async def handler(plugin: context.BasePlugin, ctx: context.EventContext) -> None:
                args = {
                    'host': ctx.host,
                    'event': ctx,
                }

                # 把 ctx.event 所有的属性都放到 args 里
                for k, v in ctx.event.dict().items():
                    args[k] = v 

                func(plugin, **args)
            
            self._current_container.event_handlers[event] = handler

            return func

        return wrapper

    # 过时
    # 最早将于 v3.4 版本移除
    def func(
        self,
        name: str=None,
    ) -> typing.Callable:
        """注册过时的内容函数"""
        self.ap.logger.debug(f'注册内容函数 {name}')
        def wrapper(func: typing.Callable) -> typing.Callable:
            
            function_schema = funcschema.get_func_schema(func)
            function_name = self._current_container.plugin_name + '-' + (func.__name__ if name is None else name)

            async def handler(
                plugin: context.BasePlugin,
                query: core_entities.Query,
                *args,
                **kwargs
            ):
                return func(*args, **kwargs)

            llm_function = tools_entities.LLMFunction(
                name=function_name,
                human_desc='',
                description=function_schema['description'],
                enable=True,
                parameters=function_schema['parameters'],
                func=handler,
            )

            self._current_container.content_functions.append(llm_function)

            return func
        
        return wrapper
    
    def handler(
        self,
        event: typing.Type[events.BaseEventModel]
    ) -> typing.Callable[[typing.Callable], typing.Callable]:
        """注册事件处理器"""
        self.ap.logger.debug(f'注册事件处理器 {event.__name__}')
        def wrapper(func: typing.Callable) -> typing.Callable:
            
            self._current_container.event_handlers[event] = func

            return func

        return wrapper

    def llm_func(
        self,
        name: str=None,
    ) -> typing.Callable:
        """注册内容函数"""
        self.ap.logger.debug(f'注册内容函数 {name}')
        def wrapper(func: typing.Callable) -> typing.Callable:
            
            function_schema = funcschema.get_func_schema(func)
            function_name = self._current_container.plugin_name + '-' + (func.__name__ if name is None else name)

            llm_function = tools_entities.LLMFunction(
                name=function_name,
                human_desc='',
                description=function_schema['description'],
                enable=True,
                parameters=function_schema['parameters'],
                func=func,
            )

            self._current_container.content_functions.append(llm_function)

            return func
        
        return wrapper
    
    async def _walk_plugin_path(
        self,
        module,
        prefix='',
        path_prefix=''
    ):
        """遍历插件路径
        """
        for item in pkgutil.iter_modules(module.__path__):
            if item.ispkg:
                await self._walk_plugin_path(
                    __import__(module.__name__ + "." + item.name, fromlist=[""]),
                    prefix + item.name + ".",
                    path_prefix + item.name + "/",
                )
            else:
                try:
                    self._current_pkg_path = "plugins/" + path_prefix
                    self._current_module_path = "plugins/" + path_prefix + item.name + ".py"

                    self._current_container = None

                    importlib.import_module(module.__name__ + "." + item.name)

                    if self._current_container is not None:
                        self.containers.append(self._current_container)
                        self.ap.logger.debug(f'插件 {self._current_container} 已加载')
                except:
                    self.ap.logger.error(f'加载插件模块 {prefix + item.name} 时发生错误')
                    traceback.print_exc()

    async def load_plugins(self) -> list[context.RuntimeContainer]:
        """加载插件
        """
        await self._walk_plugin_path(__import__("plugins", fromlist=[""]))

        return self.containers