"""关键词订阅(命中即通知)。"""
from __future__ import annotations

import enum
from datetime import datetime

from sqlalchemy import (
    Boolean,
    DateTime,
    Enum,
    ForeignKey,
    String,
    Text,
    func,
)
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class SubscriptionMatch(str, enum.Enum):
    ANY = "any"  # 标题或正文
    TITLE = "title"
    BODY = "body"


class Subscription(Base):
    __tablename__ = "subscriptions"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int] = mapped_column(
        ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    keyword: Mapped[str] = mapped_column(String(255), nullable=False)
    # 简单关键词,匹配走 ILIKE '%kw%';后续可加 regex/lucene
    match_in: Mapped[SubscriptionMatch] = mapped_column(
        Enum(
            SubscriptionMatch,
            name="subscription_match",
            values_callable=lambda x: [e.value for e in x],
        ),
        default=SubscriptionMatch.ANY,
        nullable=False,
    )
    channel: Mapped[str] = mapped_column(String(32), default="telegram", nullable=False)
    # telegram / email / web
    target: Mapped[str | None] = mapped_column(Text)  # chat_id / email
    enabled: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    last_hit_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )