import json
from datetime import datetime
from enum import IntEnum
from typing import Optional

import pytz
from pydantic import BaseModel
from sqlalchemy import Column, String, Integer, DateTime, JSON, TEXT, Index

from app.models.agent_model import AgentType
# from app.models import current_time
from app.models.base_model import Base

def current_time():
    tz = pytz.timezone('Asia/Shanghai')
    return datetime.now(tz)

class SessionModel(Base):
    __tablename__ = "chat_sessions"

    __table_args__ = (
        Index('idx_username', 'username'),
    )

    id = Column(Integer, primary_key=True)
    name = Column(String(255))
    agent_id = Column(String(255))
    agent_type = Column(Integer)  # 目前只存basic的，ragflow和bisheng的调接口获取
    create_date = Column(DateTime, default=current_time)  # 创建时间，默认值为当前时区时间
    update_date = Column(DateTime, default=current_time, onupdate=current_time, index=True)  # 更新时间，默认值为当前时区时间，更新时自动更新
    tenant_id = Column(Integer)  # 创建人
    message = Column(TEXT)  # 说明
    reference = Column(TEXT)  # 说明
    conversation_id = Column(String(64))
    session_id = Column(String(36), index=True)
    chat_mode = Column(Integer)

    # to_dict 方法
    def to_dict(self):
        return {
            'id': self.id,
            'name': self.name,
            'agent_type': self.agent_type,
            'agent_id': self.agent_id,
            'create_date': self.create_date.strftime("%Y-%m-%d %H:%M:%S"),
            'update_date': self.update_date.strftime("%Y-%m-%d %H:%M:%S"),
        }

    def log_to_json(self):
        return {
            'id': self.id,
            'name': self.name,
            'agent_type': self.agent_type,
            'agent_id': self.agent_id,
            'create_date': self.create_date.strftime("%Y-%m-%d %H:%M:%S"),
            'update_date': self.update_date.strftime("%Y-%m-%d %H:%M:%S"),
            'message': json.loads(self.message)
        }

    def add_message(self, message: dict):
        if self.message is None:
            self.message = '[]'
        try:
            msg = json.loads(self.message)
            msg.append(message)
        except Exception as e:
            return
        self.message = json.dumps(msg)


class ChatDialogData(BaseModel):
    sessionId: Optional[str] = ""
    question: str
    chatId: str