"""敏感性分析模型

记录价格变动对利润的敏感性分析结果
"""

from typing import TYPE_CHECKING
from decimal import Decimal

from sqlalchemy import BigInteger, ForeignKey, DECIMAL
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.models.base import BaseModel

if TYPE_CHECKING:
    from app.models.profit_simulation import ProfitSimulation


class SensitivityAnalysis(BaseModel):
    """敏感性分析表"""
    
    __tablename__ = "sensitivity_analyses"
    
    simulation_id: Mapped[int] = mapped_column(
        BigInteger,
        ForeignKey("profit_simulations.id"),
        nullable=False,
        index=True,
        comment="模拟ID"
    )
    price_change_rate: Mapped[Decimal] = mapped_column(
        DECIMAL(5, 2),
        nullable=False,
        comment="价格变动率(%)：如 -20, -10, 0, 10, 20"
    )
    adjusted_price: Mapped[Decimal] = mapped_column(
        DECIMAL(12, 2),
        nullable=False,
        comment="调整后价格"
    )
    adjusted_profit: Mapped[Decimal] = mapped_column(
        DECIMAL(14, 2),
        nullable=False,
        comment="调整后利润"
    )
    profit_change_rate: Mapped[Decimal] = mapped_column(
        DECIMAL(5, 2),
        nullable=False,
        comment="利润变动率(%)"
    )
    
    # 关系
    simulation: Mapped["ProfitSimulation"] = relationship(
        "ProfitSimulation",
        back_populates="sensitivity_analyses"
    )