"""Сущности домена (пока без таблиц БД — контракт для следующих версий)."""

from __future__ import annotations

from datetime import datetime
from enum import Enum
from typing import Any
from uuid import UUID, uuid4

from pydantic import BaseModel, Field


class Severity(str, Enum):
    """Грубая шкала для алертов и инцидентов."""

    INFO = "info"
    WARNING = "warning"
    CRITICAL = "critical"


class Alert(BaseModel):
    """Нормализованный алерт после парсинга ingress (Grafana и др.)."""

    id: UUID = Field(default_factory=uuid4)
    source: str = Field(..., description="grafana, manual, …")
    external_ref: str | None = Field(None, description="uid правила, fingerprint")
    title: str = ""
    severity: Severity = Severity.WARNING
    labels: dict[str, str] = Field(default_factory=dict)
    payload: dict[str, Any] = Field(default_factory=dict)
    received_at: datetime | None = None


class Incident(BaseModel):
    """Инцидент в продукте (отдельно от сырого ingress_events)."""

    id: UUID = Field(default_factory=uuid4)
    title: str = ""
    status: str = Field("open", description="open, acknowledged, resolved, …")
    severity: Severity = Severity.WARNING
    alert_ids: list[UUID] = Field(default_factory=list)
    created_at: datetime | None = None
    updated_at: datetime | None = None


class EscalationStep(BaseModel):
    """Один шаг цепочки (уведомление, пауза, повтор)."""

    order: int = 0
    kind: str = Field(..., description="notify, wait, repeat, …")
    config: dict[str, Any] = Field(default_factory=dict)


class EscalationPolicy(BaseModel):
    """Политика эскалации, привязанная к команде/сервису."""

    id: UUID = Field(default_factory=uuid4)
    name: str = ""
    steps: list[EscalationStep] = Field(default_factory=list)