import uuid
from sqlalchemy import String, Integer, Boolean
from sqlalchemy.orm import Mapped, mapped_column
from sqlalchemy.dialects.postgresql import UUID
from app.db.session import Base
from app.models.common import UUIDMixin, TimestampMixin

class Attachment(Base, UUIDMixin, TimestampMixin):
    __tablename__ = "attachments"
    request_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), index=True, nullable=False)
    message_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), index=True, nullable=True)
    file_name: Mapped[str] = mapped_column(String(300), nullable=False)
    mime_type: Mapped[str] = mapped_column(String(150), nullable=False)
    size_bytes: Mapped[int] = mapped_column(Integer, nullable=False)
    s3_key: Mapped[str] = mapped_column(String(500), nullable=False)
    immutable: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)