from sqlalchemy import Column, String, Boolean, DateTime, Text, ForeignKey
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
import uuid

from app.database import Base


class Notification(Base):
    __tablename__ = "notifications"
    
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(
        UUID(as_uuid=True), 
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False, 
        index=True
    )
    
    # Content
    title = Column(String(255), nullable=False)
    message = Column(Text, nullable=False)
    type = Column(String(50))  # job_alert, roadmap_reminder, interview_reminder, achievement
    
    # Action
    action_url = Column(Text)
    action_text = Column(String(100))
    
    # Status
    is_read = Column(Boolean, default=False, index=True)
    read_at = Column(DateTime)
    
    # Timestamp
    created_at = Column(DateTime, server_default=func.now(), index=True)
    
    # Relationship
    user = relationship("User", back_populates="notifications")
    
    def __repr__(self):
        return f"<Notification {self.title}>"