from app import db
from app.models.post import Post
from app.models.comment import Comment
from config import V5Config

class Thread(Post):
    """ Some thread, such as a topic, program, tutorial """

    __tablename__ = 'thread'
    id = db.Column(db.Integer, db.ForeignKey('post.id'), primary_key=True)

    thread_type = db.Column(db.String(20))
    __mapper_args__ = {
        'polymorphic_identity': __tablename__,
        'polymorphic_on': thread_type
    }

    # Standalone properties
    title = db.Column(db.Unicode(V5Config.THREAD_NAME_MAXLEN))

    # Relationships
    top_comment = db.Column(db.Integer, db.ForeignKey('comment.id'))
    comments = db.relationship('Comment', backref='thread')

    def __init__(self, author, text, title):
        """ Create a Thread """
        super.__init__(author, text)
        self.title = title

    def __repr__(self):
        return f'<Thread #{self.id}'