"""通知模型 — 任务转交/驳回等事件的消息提醒"""
import uuid
from datetime import datetime
from sqlalchemy import String, DateTime, Boolean, ForeignKey, Text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.models.base import Base
from app.core.time_utils import get_beijing_time

# 通知类型常量
NOTIFY_TRANSFER = "TRANSFER"   # 新任务派发/转交
NOTIFY_REJECT = "REJECT"       # 品质驳回
NOTIFY_COMMENT = "COMMENT"     # 留言提醒


class Notification(Base):
    __tablename__ = "notifications"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4,
    )

    user_id: Mapped[str] = mapped_column(
        String(64), nullable=False, index=True, comment="接收人ID（逻辑外键→老系统）",
    )

    title: Mapped[str] = mapped_column(
        String(200), nullable=False, comment="通知标题",
    )

    content: Mapped[str] = mapped_column(
        Text, nullable=False, comment="通知内容详情",
    )

    type: Mapped[str] = mapped_column(
        String(20), nullable=False, comment="通知类型: TRANSFER(转交派发) | REJECT(驳回)",
    )

    task_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("tasks.id", ondelete="SET NULL"), nullable=True, comment="关联任务ID",
    )

    is_read: Mapped[bool] = mapped_column(
        Boolean, default=False, comment="是否已读",
    )

    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=get_beijing_time, comment="创建时间",
    )

    def __repr__(self) -> str:
        return f"<Notification {self.type} → {self.user_id}>"