import uuid
from datetime import datetime

from sqlalchemy import CheckConstraint, DateTime, Index, String
from sqlalchemy.dialects.postgresql import JSONB, UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base
from app.models.mixins import UUIDPrimaryKeyMixin

ACTOR_TYPES = ("user", "service", "system")


class AuditEvent(UUIDPrimaryKeyMixin, Base):
    __tablename__ = "audit_events"
    __table_args__ = (
        CheckConstraint("actor_type IN ('user','service','system')", name="ck_audit_actor_type"),
        Index("ix_audit_action_occurred", "action", "occurred_at"),
        Index("ix_audit_entity", "entity_type", "entity_id"),
    )

    actor_type: Mapped[str] = mapped_column(String(20), nullable=False)
    actor_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    actor_label: Mapped[str] = mapped_column(String(120), nullable=False)
    action: Mapped[str] = mapped_column(String(80), nullable=False)
    entity_type: Mapped[str] = mapped_column(String(30), nullable=False)
    entity_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    correlation_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
    before_json: Mapped[dict | None] = mapped_column(JSONB)
    after_json: Mapped[dict | None] = mapped_column(JSONB)
    metadata_json: Mapped[dict | None] = mapped_column(JSONB)
    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)