"""AuditLog model — audit trail for all create/update/delete/login actions.

Note: DeletionLog has been merged into EntityHistory (action='delete').
DeletionLog is re-exported here as an alias for backward compatibility.
"""

from __future__ import annotations

import uuid
from datetime import datetime
from typing import Any

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

from app.core.db import Base, TenantMixin

# Re-export EntityHistory as DeletionLog for backward compatibility.
# Tests import DeletionLog from app.models.audit and use entity_snapshot attribute.
from app.models.entity_history import EntityHistory as DeletionLog


class AuditLog(Base, TenantMixin):
    """Audit trail for all create/update/delete/login actions."""

    __tablename__ = "audit_log"

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    user_id: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True, index=True
    )
    action: Mapped[str] = mapped_column(String(50), nullable=False)
    entity_type: Mapped[str] = mapped_column(String(50), nullable=False, index=True)
    entity_id: Mapped[uuid.UUID | None] = mapped_column(PGUUID(as_uuid=True), nullable=True)
    changes: Mapped[dict[str, Any] | None] = mapped_column(JSONB, nullable=True)
    timestamp: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), index=True
    )