"""项目人工成本模型

管理项目的人工成本配置
"""

from typing import Optional, TYPE_CHECKING
from decimal import Decimal

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

from app.models.base import BaseModel

if TYPE_CHECKING:
    from app.models.project import Project
    from app.models.staff_level import StaffLevel


class ProjectLaborCost(BaseModel):
    """项目人工成本表"""
    
    __tablename__ = "project_labor_costs"
    
    project_id: Mapped[int] = mapped_column(
        BigInteger,
        ForeignKey("projects.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
        comment="项目ID"
    )
    staff_level_id: Mapped[int] = mapped_column(
        BigInteger,
        ForeignKey("staff_levels.id"),
        nullable=False,
        index=True,
        comment="人员级别ID"
    )
    duration_minutes: Mapped[int] = mapped_column(
        Integer,
        nullable=False,
        comment="操作时长（分钟）"
    )
    hourly_rate: Mapped[Decimal] = mapped_column(
        DECIMAL(10, 2),
        nullable=False,
        comment="时薪（记录时的快照）"
    )
    labor_cost: Mapped[Decimal] = mapped_column(
        DECIMAL(12, 2),
        nullable=False,
        comment="人工成本 = duration/60 * hourly_rate"
    )
    remark: Mapped[Optional[str]] = mapped_column(
        String(200),
        nullable=True,
        comment="备注"
    )
    
    # 关系
    project: Mapped["Project"] = relationship(
        "Project",
        back_populates="labor_costs"
    )
    staff_level: Mapped["StaffLevel"] = relationship(
        "StaffLevel",
        back_populates="project_labor_costs"
    )