from typing import Dict, Any, Optional


class WecomBotEvent(dict):
    @staticmethod
    def from_payload(payload: Dict[str, Any]) -> Optional['WecomBotEvent']:
        try:
            event = WecomBotEvent(payload)
            return event
        except KeyError:
            return None

    @property
    def type(self) -> str:
        """
        事件类型
        """
        return self.get('type', '')

    @property
    def userid(self) -> str:
        """
        用户id
        """
        return self.get('from', {}).get('userid', '')

    @property
    def content(self) -> str:
        """
        内容
        """
        return self.get('content', '')

    @property
    def picurl(self) -> str:
        """
        图片url
        """
        return self.get('picurl', '')

    @property
    def chatid(self) -> str:
        """
        群组id
        """
        return self.get('chatid', {})

    @property
    def message_id(self) -> str:
        """
        消息id
        """
        return self.get('msgid', '')
    
    @property
    def ai_bot_id(self) -> str:
        """
        AI Bot ID
        """
        return self.get('aibotid', '')