"""Backup model — tracks database backup records per tenant."""

from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import BigInteger, DateTime, String, Text, func
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin


class Backup(Base, TenantMixin):
    """Database backup record scoped to a tenant.

    Tracks pg_dump backups with status, file location, and error details.
    """

    __tablename__ = "backups"

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )

    # ── Identity ──
    filename: Mapped[str] = mapped_column(String(255), nullable=False)
    size_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True, default=None)

    # ── Status ──
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="pending"
    )  # pending, completed, failed
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True, default=None)

    # ── Audit ──
    created_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), nullable=True
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    completed_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True, default=None
    )