from __future__ import annotations

from datetime import datetime

from sqlalchemy import Boolean, DateTime, JSON, SmallInteger, String, func
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base


class PushPreference(Base):
    """
    用户推送偏好（以 client_user_id 为主键）。
    """

    __tablename__ = "push_preferences"

    client_user_id: Mapped[str] = mapped_column(
        String(length=64),
        primary_key=True,
        comment="客户端用户标识（UUID）",
    )

    enabled: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default="0",
        comment="是否开启每日提醒（enabled=false 或 times_per_day=0 均视为关闭）",
    )

    times_per_day: Mapped[int] = mapped_column(
        SmallInteger,
        nullable=False,
        server_default="0",
        comment="每天推送次数（0～5）",
    )

    timezone: Mapped[str | None] = mapped_column(
        String(length=64),
        nullable=True,
        comment="IANA 时区（例如 Asia/Shanghai），来自客户端上报",
    )

    locale: Mapped[str | None] = mapped_column(
        String(length=32),
        nullable=True,
        comment="客户端语言（例如 zh-CN/en/zh-TW），用于文案语言选择",
    )

    user_profile_json: Mapped[dict | None] = mapped_column(
        JSON,
        nullable=True,
        comment="用户画像（V1.2；可选）。用于 Push 场景推荐文案生成。",
    )

    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        nullable=False,
        server_default=func.now(),
        server_onupdate=func.now(),
        comment="更新时间",
    )