"""用户-技能绑定模型"""
from .base import Base
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy import BigInteger, VARCHAR, DECIMAL, TIMESTAMP, ForeignKey, Integer, Float
from typing import Optional
from datetime import datetime


class UserSkillBinding(Base):
    __tablename__ = "user_skill_bindings"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(
        BigInteger, ForeignKey("users.id"), nullable=False
    )
    skill_tag_id: Mapped[int] = mapped_column(
        BigInteger, ForeignKey("skill_tags.id"), nullable=False
    )
    proficiency_level: Mapped[str] = mapped_column(VARCHAR(50), nullable=False)
    proficiency: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    level: Mapped[Optional[str]] = mapped_column(VARCHAR(20), nullable=True)
    years_experience: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    last_used_at: Mapped[Optional[datetime]] = mapped_column(TIMESTAMP, nullable=True)
    quality_score: Mapped[float] = mapped_column(DECIMAL(3, 1), nullable=False, default=0.0)
    efficiency_score: Mapped[float] = mapped_column(DECIMAL(3, 1), nullable=False, default=0.0)

    user = relationship("User", back_populates="skill_bindings")
    skill_tag = relationship("SkillTag", back_populates="user_bindings")