"""公共配置 + 回测组合表（2026-09 重构）。

- `global_config`：全局唯一一行（id="default"），存费率/滑点/最低佣金/复权口径/基准。
- `backtest_combo`：回测组合，引用若干选股策略（strategy_ids JSON）+ 回测参数
  （资金/持仓数/持仓天数区间/调仓时机/区间）。费率与复权不在此表 —— 运行时从
  global_config 快照进归档的 config_snapshot，保证可复现。
"""

from __future__ import annotations

from datetime import date, datetime

from sqlalchemy import Date, DateTime, Integer, Numeric, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.infrastructure.persistence.sqlalchemy.base import Base


class GlobalConfigModel(Base):
    __tablename__ = "global_config"

    id: Mapped[str] = mapped_column(String(32), primary_key=True)  # 恒为 "default"
    commission_rate: Mapped[float] = mapped_column(Numeric(10, 6), default=0.0003)
    stamp_tax_rate: Mapped[float] = mapped_column(Numeric(10, 6), default=0.0005)
    slippage_rate: Mapped[float] = mapped_column(Numeric(10, 6), default=0.001)
    min_commission: Mapped[float] = mapped_column(Numeric(10, 4), default=5.0)
    price_adjustment: Mapped[str] = mapped_column(String(8), default="hfq")
    benchmark: Mapped[str] = mapped_column(String(16), default="000300.SH")
    updated_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)


class BacktestComboModel(Base):
    __tablename__ = "backtest_combo"

    id: Mapped[str] = mapped_column(String(32), primary_key=True)
    name: Mapped[str] = mapped_column(String(64), unique=True)
    description: Mapped[str] = mapped_column(String(300), default="")
    strategy_ids_json: Mapped[str] = mapped_column(Text)  # JSON list[str]
    initial_capital: Mapped[float] = mapped_column(Numeric(20, 2), default=1_000_000.0)
    hold_count: Mapped[int] = mapped_column(Integer, default=20)
    hold_min_days: Mapped[int] = mapped_column(Integer, default=0)
    hold_max_days: Mapped[int | None] = mapped_column(Integer, nullable=True)
    rebalance_freq: Mapped[str] = mapped_column(String(12), default="monthly")
    start_date: Mapped[date] = mapped_column(Date)
    end_date: Mapped[date] = mapped_column(Date)
    version: Mapped[str] = mapped_column(String(16), default="1")
    created_at: Mapped[datetime] = mapped_column(DateTime)