"""人员级别模型

管理不同岗位/级别的时薪标准
"""

from typing import List, TYPE_CHECKING

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

from app.models.base import BaseModel

if TYPE_CHECKING:
    from app.models.project_labor_cost import ProjectLaborCost


class StaffLevel(BaseModel):
    """人员级别表"""
    
    __tablename__ = "staff_levels"
    
    level_code: Mapped[str] = mapped_column(
        String(20),
        unique=True,
        nullable=False,
        comment="级别编码"
    )
    level_name: Mapped[str] = mapped_column(
        String(50),
        nullable=False,
        comment="级别名称"
    )
    hourly_rate: Mapped[float] = mapped_column(
        DECIMAL(10, 2),
        nullable=False,
        comment="时薪（元/小时）"
    )
    is_active: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        default=True,
        comment="是否启用"
    )
    
    # 关系
    project_labor_costs: Mapped[List["ProjectLaborCost"]] = relationship(
        "ProjectLaborCost",
        back_populates="staff_level"
    )