import uuid
from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, Integer, String, Text, UniqueConstraint, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class ContextFile(Base):
    __tablename__ = "context_files"
    __table_args__ = (UniqueConstraint("type", "user_id", name="uq_context_files_type_user"),)

    type: Mapped[str] = mapped_column(String(20), nullable=False)
    user_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=True
    )
    content: Mapped[str] = mapped_column(Text, nullable=False, default="")
    version: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
    updated_by: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
    )