from abc import ABC, abstractmethod
from iti.applications.common import setup_logger
from flask import current_app

logger = setup_logger(__name__)


class BaseEventHandler(ABC):
    """
    事件处理器基类
    """

    def __init__(self, order: int = 0, async_mode: bool = False):
        self.order = order
        self.async_mode = async_mode

    @abstractmethod
    def handle(self, data: any) -> any:
        """
        处理事件
        """
        pass

    def before_handle(self, data: any) -> any:
        """
        处理事件前
        """
        return data

    def after_handle(self, data: any) -> any:
        """
        处理事件后
        """
        return data

    def on_error(self, error: Exception, data: any) -> None:
        """
        处理事件错误
        """
        logger.error(f"事件处理错误: {error}, 数据: {data}", exc_info=True)


class FlaskEventHandler(BaseEventHandler):
    """Flask 事件处理器基类"""

    def __init__(self, order: int = 0, async_mode: bool = False):
        super().__init__(order, async_mode)
        self._app = None

    @property
    def app(self):
        """获取 Flask 应用实例"""
        if self._app is None:
            self._app = current_app
        return self._app

    def handle(self, data: any) -> any:
        """处理事件"""
        try:
            data = self.before_handle(data)
            result = self._do_handle(data)
            result = self.after_handle(result)
            return result
        except Exception as e:
            self.on_error(e, data)
            raise

    def _do_handle(self, data: any) -> any:
        """实际处理逻辑"""
        pass