"""省钱记录表。

是 profile「累计帮你省了」和「省钱战绩」的唯一数据源:每完成一次比价/下单,
省了多少记一行。本期比价还没接后端,数据由 demo seeder 幂等灌入(source='demo'),
聚合接口照常做真实 SUM/分组;等比价真接入后,改成上报写入、停掉 seeder 即可。
"""
from __future__ import annotations

from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, Integer, String, func
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base


class SavingsRecord(Base):
    __tablename__ = "savings_record"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("user.id"), index=True, nullable=False
    )
    # 订单金额 / 省下金额,单位:分
    order_amount_cents: Mapped[int] = mapped_column(Integer, nullable=False)
    saved_amount_cents: Mapped[int] = mapped_column(Integer, nullable=False)
    platform: Mapped[str | None] = mapped_column(String(32), nullable=True)
    title: Mapped[str | None] = mapped_column(String(128), nullable=True)
    # 店铺名(订单明细卡标题,如「窑鸡王（王府井店）」)
    shop_name: Mapped[str | None] = mapped_column(String(128), nullable=True)
    # 菜品名列表(JSONB),PG 上可建 GIN 索引,前 2 道直接展示,其余收进「还有 N 道菜」展开。
    dishes: Mapped[list[str]] = mapped_column(JSONB, nullable=False, default=list)
    # 来源:demo(演示) / compare(真实比价上报)
    source: Mapped[str] = mapped_column(String(16), nullable=False, default="compare")

    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), index=True, nullable=False
    )

    def __repr__(self) -> str:  # pragma: no cover
        return f"<SavingsRecord id={self.id} user_id={self.user_id} saved={self.saved_amount_cents}>"