from datetime import datetime, timezone
from typing import Optional

from sqlalchemy import DateTime, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.db import Base


class KnowledgeBase(Base):
    __tablename__ = "knowledge_bases"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    tenant_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    status: Mapped[str] = mapped_column(String(32), default="active")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )