"""fin_account 客户资金账户表 ORM 模型（现金余额，一人一户）。

balance 为账户总余额（含冻结部分），可用余额 = balance - frozen_amount，不落库。
"""
from __future__ import annotations

from datetime import datetime
from decimal import Decimal

from sqlalchemy import BigInteger, DateTime, Integer, Numeric, String, func
from sqlalchemy.orm import Mapped, mapped_column

from model.base import Base


class FinAccount(Base):
    __tablename__ = "fin_account"
    __table_args__ = {"comment": "客户资金账户表（现金余额，申购扣款/赎回入账的账务载体）"}

    customer_id: Mapped[int] = mapped_column(
        BigInteger, primary_key=True, autoincrement=False
    )
    balance: Mapped[Decimal] = mapped_column(Numeric(18, 2), server_default="0")
    frozen_amount: Mapped[Decimal] = mapped_column(Numeric(18, 2), server_default="0")
    currency: Mapped[str] = mapped_column(String(8), server_default="CNY")
    status: Mapped[str] = mapped_column(String(16), server_default="正常")
    version: Mapped[int] = mapped_column(Integer, server_default="0")
    create_time: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now()
    )
    update_time: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now(), onupdate=func.now()
    )