"""标杆价格模型

维护行业标杆机构的价格参考
"""

from typing import Optional, TYPE_CHECKING
from decimal import Decimal
from datetime import date

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

from app.models.base import BaseModel

if TYPE_CHECKING:
    from app.models.category import Category


class BenchmarkPrice(BaseModel):
    """标杆价格表"""
    
    __tablename__ = "benchmark_prices"
    
    benchmark_name: Mapped[str] = mapped_column(
        String(100),
        nullable=False,
        comment="标杆机构名称"
    )
    category_id: Mapped[Optional[int]] = mapped_column(
        BigInteger,
        ForeignKey("categories.id"),
        nullable=True,
        index=True,
        comment="项目分类ID"
    )
    min_price: Mapped[Decimal] = mapped_column(
        DECIMAL(12, 2),
        nullable=False,
        comment="最低价"
    )
    max_price: Mapped[Decimal] = mapped_column(
        DECIMAL(12, 2),
        nullable=False,
        comment="最高价"
    )
    avg_price: Mapped[Decimal] = mapped_column(
        DECIMAL(12, 2),
        nullable=False,
        comment="均价"
    )
    price_tier: Mapped[str] = mapped_column(
        String(20),
        nullable=False,
        default="medium",
        comment="价格带：low-低端, medium-中端, high-高端, premium-奢华"
    )
    effective_date: Mapped[date] = mapped_column(
        Date,
        nullable=False,
        index=True,
        comment="生效日期"
    )
    remark: Mapped[Optional[str]] = mapped_column(
        String(200),
        nullable=True,
        comment="备注"
    )
    
    # 关系
    category: Mapped[Optional["Category"]] = relationship(
        "Category"
    )