from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean, ForeignKey
from sqlalchemy.sql import func
from sqlalchemy.orm import relationship
from app.core.config import Base


class Notification(Base):
    __tablename__ = "notifications"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    type = Column(String(50), nullable=False)  # task.assigned, task.mentioned, comment.added, milestone.due
    title = Column(String(255), nullable=False)
    message = Column(Text, nullable=True)
    entity_type = Column(String(50), nullable=True)  # task, comment, milestone
    entity_id = Column(Integer, nullable=True)
    is_read = Column(Boolean, default=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    user = relationship("User")