import uuid
from datetime import datetime

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

from app.core.database import Base


class Document(Base):
    __tablename__ = "documents"

    id: Mapped[str] = mapped_column(
        String(64),
        primary_key=True,
        default=lambda: f"doc-{uuid.uuid4().hex[:12]}",
    )
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    content: Mapped[str] = mapped_column(Text, nullable=False, default="")
    format: Mapped[str] = mapped_column(String(32), nullable=False, default="markdown")
    session_id: Mapped[str | None] = mapped_column(String(128), nullable=True)
    template_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
    created_by: Mapped[str | None] = mapped_column(String(128), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )