from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey
from sqlalchemy.orm import relationship
from app.database import Base
from app.utils.datetime import utcnow


class Task(Base):
    """任务模型"""
    __tablename__ = "tasks"

    id = Column(Integer, primary_key=True, index=True)
    title = Column(String(200), nullable=False)
    description = Column(Text, nullable=True)
    priority = Column(String(20), default="q4")  # q1(重要紧急), q2(重要不紧急), q3(不重要紧急), q4(不重要不紧急)
    due_date = Column(DateTime, nullable=True)
    is_completed = Column(Boolean, default=False)
    category_id = Column(Integer, ForeignKey("categories.id"), nullable=True)
    created_at = Column(DateTime, default=utcnow)
    updated_at = Column(DateTime, default=utcnow, onupdate=utcnow)

    # 关联关系
    category = relationship("Category", back_populates="tasks")
    tags = relationship("Tag", secondary="task_tags", back_populates="tasks")