"""Notification model — in-app notifications for user actions."""

import uuid
from datetime import datetime

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

from app.database import Base


class Notification(Base):
    """
    In-app notification for alerting users when they need to act.

    Types include: test_assigned, validation_needed, test_rejected,
    test_validated, test_state_changed, etc.
    """
    __tablename__ = "notifications"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
    type = Column(String, nullable=False)
    title = Column(String, nullable=False)
    message = Column(Text, nullable=True)
    entity_type = Column(String, nullable=True)
    entity_id = Column(UUID(as_uuid=True), nullable=True)
    read = Column(Boolean, default=False)
    created_at = Column(DateTime, default=datetime.utcnow)

    # Relationships
    user = relationship("User")

    __table_args__ = (
        Index("ix_notifications_user_id", "user_id"),
        Index("ix_notifications_read", "read"),
        Index("ix_notifications_created_at", "created_at"),
    )