from sqlalchemy import Column, String, Boolean, DateTime, Text, ForeignKey, Enum as SqlEnum
from sqlalchemy.orm import relationship
from utils.utils import Base
from datetime import datetime
import uuid

class Notification(Base):
    __tablename__ = "notifications"
    
    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    user_id = Column(String(36), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    notification_type = Column(String(50), nullable=False, index=True)
    title = Column(String(255), nullable=False)
    message = Column(Text, nullable=False)
    link_url = Column(String(500), nullable=True)
    is_read = Column(Boolean, default=False, nullable=False, index=True)
    read_at = Column(DateTime, nullable=True)
    delivery_method = Column(String(50), nullable=False)
    delivery_status = Column(String(50), nullable=False, index=True)
    sent_at = Column(DateTime, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)
    
    user = relationship("User", back_populates="notifications")