"""Attachment model — file attachments for any entity."""

from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, Index, Integer, String
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin


class Attachment(Base, TenantMixin):
    """Attachment entity — links files to companies, contacts, invoices, etc."""

    __tablename__ = "attachments"
    __table_args__ = (
        Index("ix_attachments_entity", "entity_type", "entity_id", "tenant_id"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    entity_type: Mapped[str] = mapped_column(String(50), nullable=False)
    entity_id: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), nullable=False)
    filename: Mapped[str] = mapped_column(String(255), nullable=False)
    file_path: Mapped[str] = mapped_column(String(500), nullable=False)
    mime_type: Mapped[str] = mapped_column(String(100), nullable=False, default="application/octet-stream")
    file_size: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    uploaded_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)