from enum import Enum as Enumeration
import time
from sqlalchemy import Column, Enum, Integer, ForeignKey, JSON as JSONType
from sqlalchemy.orm import relationship

from orm.author import Author
from services.db import Base


class NotificationEntity(Enumeration):
    REACTION = 1
    SHOUT = 2
    FOLLOWER = 3


class NotificationAction(Enumeration):
    CREATE = 1
    UPDATE = 2
    DELETE = 3
    SEEN = 4
    FOLLOW = 5
    UNFOLLOW = 6


class NotificationSeen(Base):
    __tablename__ = "notification_seen"

    viewer = Column(ForeignKey("author.id"))
    notification = Column(ForeignKey("notification.id"))


class Notification(Base):
    __tablename__ = "notification"

    created_at = Column(Integer, default=lambda: int(time.time()))
    entity = Column(Enum(NotificationEntity), nullable=False)
    action = Column(Enum(NotificationAction), nullable=False)
    payload = Column(JSONType, nullable=True)

    seen = relationship(lambda: Author, secondary="notification_seen")