from datetime import datetime
from typing import Optional

from sqlalchemy import String, DateTime, ForeignKey, Integer, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


class Attachment(Base):
    __tablename__ = "attachments"

    id: Mapped[int] = mapped_column(primary_key=True)
    record_id: Mapped[int] = mapped_column(
        ForeignKey("records.id", ondelete="CASCADE"), nullable=False, index=True
    )
    column_id: Mapped[int] = mapped_column(
        ForeignKey("columns.id", ondelete="CASCADE"), nullable=True
    )
    filename: Mapped[str] = mapped_column(String(255), nullable=False)
    file_path: Mapped[str] = mapped_column(String(500), nullable=False)
    file_size: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    mime_type: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
    uploaded_at: Mapped[datetime] = mapped_column(DateTime, default=func.now())

    # Relationships
    record = relationship("Record", back_populates="attachments")
    column = relationship("Column", back_populates="attachments")

    def __repr__(self):
        return f"<Attachment(id={self.id}, filename={self.filename})>"