"""固定成本模型

管理月度固定成本（房租、水电等）及分摊方式
"""

from sqlalchemy import String, Boolean, DECIMAL
from sqlalchemy.orm import Mapped, mapped_column

from app.models.base import BaseModel


class FixedCost(BaseModel):
    """固定成本表"""
    
    __tablename__ = "fixed_costs"
    
    cost_name: Mapped[str] = mapped_column(
        String(100),
        nullable=False,
        comment="成本名称"
    )
    cost_type: Mapped[str] = mapped_column(
        String(20),
        nullable=False,
        comment="类型：rent-房租, utilities-水电, property-物业, other-其他"
    )
    monthly_amount: Mapped[float] = mapped_column(
        DECIMAL(12, 2),
        nullable=False,
        comment="月度金额"
    )
    year_month: Mapped[str] = mapped_column(
        String(7),
        nullable=False,
        index=True,
        comment="年月：2026-01"
    )
    allocation_method: Mapped[str] = mapped_column(
        String(20),
        nullable=False,
        default="count",
        comment="分摊方式：count-按项目数, revenue-按营收, duration-按时长"
    )
    is_active: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        default=True,
        comment="是否启用"
    )