"""SQLAlchemy model for vehicle file attachments."""

import uuid
from datetime import datetime
from typing import TYPE_CHECKING

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

from app.database import Base

if TYPE_CHECKING:
    from app.models.vehicle import Vehicle


class File(Base):
    """File attachment entity linked to a vehicle."""

    __tablename__ = "files"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    vehicle_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("vehicles.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    original_filename: Mapped[str] = mapped_column(String(255), nullable=False)
    stored_filename: Mapped[str] = mapped_column(String(255), nullable=False)
    file_path: Mapped[str] = mapped_column(String(512), nullable=False)
    mime_type: Mapped[str] = mapped_column(String(100), nullable=False)
    file_size: Mapped[int] = mapped_column(Integer, nullable=False)
    thumbnail_path: Mapped[str | None] = mapped_column(String(512), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        server_default=func.now(),
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        server_default=func.now(),
        onupdate=func.now(),
    )

    vehicle: Mapped["Vehicle"] = relationship("Vehicle", back_populates="files")

    def __repr__(self) -> str:
        return f"<File id={self.id} vehicle_id={self.vehicle_id} filename={self.original_filename}>"

    def to_dict(self) -> dict:
        """Serialize file for API responses."""
        return {
            "id": str(self.id),
            "vehicle_id": str(self.vehicle_id),
            "original_filename": self.original_filename,
            "stored_filename": self.stored_filename,
            "file_path": self.file_path,
            "mime_type": self.mime_type,
            "file_size": self.file_size,
            "thumbnail_path": self.thumbnail_path,
            "created_at": (self.created_at.isoformat() if self.created_at else None),
            "updated_at": (self.updated_at.isoformat() if self.updated_at else None),
        }