from enum import Enum as Enumeration

from sqlalchemy import JSON as JSONType
from sqlalchemy import Column, ForeignKey, Integer, String
from sqlalchemy.orm import relationship

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


class NotificationEntity(Enumeration):
    REACTION = "reaction"
    SHOUT = "shout"
    FOLLOWER = "follower"


class NotificationAction(Enumeration):
    CREATE = "create"
    UPDATE = "update"
    DELETE = "delete"
    SEEN = "seen"
    FOLLOW = "follow"
    UNFOLLOW = "unfollow"


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, server_default=str(int(time.time())))
    entity = Column(String, nullable=False)
    action = Column(String, nullable=False)
    payload = Column(JSONType, nullable=True)

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