from __future__ import annotations

from dataclasses import dataclass, field
from datetime import datetime, timezone
from typing import Any
from uuid import uuid4


def utcnow() -> datetime:
    return datetime.now(timezone.utc)


@dataclass(slots=True)
class AuditLogEntry:
    """Business-level audit record for operator actions."""

    action: str
    actor_id: str | None = None
    actor_email: str | None = None
    target_type: str | None = None
    target_id: str | None = None
    source: str = "fastapi"
    result: str = "accepted"
    meta: dict[str, Any] | list[Any] | None = None
    request_id: str | None = None
    created_at: datetime = field(default_factory=utcnow)
    id: str = field(default_factory=lambda: str(uuid4()))


@dataclass(slots=True)
class SystemEvent:
    """System/runtime event used for telemetry and forwarding pipelines."""

    event_name: str
    category: str
    request_id: str | None = None
    site_id: str | None = None
    site_key: str | None = None
    experiment_id: str | None = None
    experiment_key: str | None = None
    variant_id: str | None = None
    variant_key: str | None = None
    visitor_id: str | None = None
    payload: dict[str, Any] | list[Any] | None = None
    created_at: datetime = field(default_factory=utcnow)
    id: str = field(default_factory=lambda: str(uuid4()))