from sqlalchemy import Column, Integer, String, DateTime, func
from pydantic import BaseModel
from typing import Optional
from datetime import datetime
from chatchat.server.db.base import Base


class KnowledgeBaseModel(Base):
    """
    知识库模型
    """
    __tablename__ = 'knowledge_base'
    id = Column(Integer, primary_key=True, autoincrement=True, comment='知识库ID')
    kb_name = Column(String(50), comment='知识库名称')
    kb_info = Column(String(200), comment='知识库简介(用于Agent)')
    vs_type = Column(String(50), comment='向量库类型')
    embed_model = Column(String(50), comment='嵌入模型名称')
    file_count = Column(Integer, default=0, comment='文件数量')
    create_time = Column(DateTime, default=func.now(), comment='创建时间')

    def __repr__(self):
        return f"<KnowledgeBase(id='{self.id}', kb_name='{self.kb_name}',kb_intro='{self.kb_info} vs_type='{self.vs_type}', embed_model='{self.embed_model}', file_count='{self.file_count}', create_time='{self.create_time}')>"

# 创建一个对应的 Pydantic 模型
class KnowledgeBaseSchema(BaseModel):
    id: int
    kb_name: str
    kb_info: Optional[str]
    vs_type: Optional[str]
    embed_model: Optional[str]
    file_count: Optional[int]
    create_time: Optional[datetime]

    class Config:
        from_attributes = True  # 确保可以从 ORM 实例进行验证