from sqlalchemy import Column, Integer, String, Text, DateTime, JSON, ForeignKey, Enum as SAEnum
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from database import Base


class Material(Base):
    __tablename__ = "materials"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    filename = Column(String(255), nullable=False)
    title = Column(String(200), nullable=False)
    material_type = Column(String(50), default="text")
    subject = Column(String(50), default="")
    grade = Column(String(50), default="")
    tags = Column(JSON, default=list)
    summary = Column(Text, default="")
    char_count = Column(Integer, default=0)
    size = Column(Integer, default=0)
    source = Column(String(50), default="upload")
    status = Column(SAEnum("active", "archived", name="material_status"), default="active")
    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())

    author = relationship("User", back_populates="materials")