import time
from enum import Enum as Enumeration

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

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


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(JSON, nullable=True)

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