from . import db
from flask import url_for
import random
from sqlalchemy import event


photos = db.Table('photos',
        db.Column('page_id', db.Integer, db.ForeignKey('page.id')),
        db.Column('photo_id', db.Integer, db.ForeignKey('photo.id'))
        )

thumbnails = db.Table('thumbnails',
        db.Column('page_id', db.Integer, db.ForeignKey('page.id')),
        db.Column('photo_id', db.Integer, db.ForeignKey('photo.id'))
        )


class Page(db.Model):
    __tablename__ = 'page'

    id = db.Column(db.Integer, primary_key=True)

    parent_id = db.Column(db.Integer, db.ForeignKey('page.id'))
    children = db.relationship("Page", backref=db.backref('parent', remote_side=[id]))

    name = db.Column(db.String(64), index=True, default="")
    permalink = db.Column(db.String(256), index=True, default="")

    title = db.Column(db.String(120), index=True, default="")
    description = db.Column(db.Text(), index=True, default="")

    thumbnail = db.relationship('Photo', secondary=thumbnails, uselist=False)
    photos = db.relationship('Photo', secondary=photos)

    endpoint = db.Column(db.Boolean, default=False)
    published = db.Column(db.Boolean, default=False)


    def update_permalink(self, name=None, parent_id=None):
        parent_id = parent_id or self.parent_id
        name = name or self.name
        if self.id == 1:
            self.permalink = ""
            return
        url = ""
        if parent_id:
            url = self.parent.permalink
        url =  "/".join(filter(None,[url, name]))
        self.permalink = url
        print("Set permalink of " + repr(name) + " to " + url)

    @property
    def all_photos(self):
        if self.photos:
            return self.photos
        else:
            l = [photo for c in self.children for photo in c.all_photos]
            random.shuffle(l)
            if len(l) > 25:
                del l[25:]
            return l
    @property
    def breadcrumbs(self):
        if self.parent:
            l = list(self.parent.breadcrumbs)
        else:
            l = list()
        l.append(self)
        return l
@event.listens_for(Page.parent_id, 'set')
def parent_set(target, value, old_value, initiator):
    if value:
        target.update_permalink(parent_id=value)
@event.listens_for(Page.name, 'set')
def name_set(target, value, old_value, initiator):
    if value:
        target.update_permalink(name=value)

class Photo(db.Model):
    __tablename__ = 'photo'

    id = db.Column(db.Integer, primary_key=True)
    link_id = db.Column(db.Integer, db.ForeignKey('page.id'))
    link = db.relationship("Page", foreign_keys=[link_id], uselist=False)
    alt = db.Column(db.String(120), index=True)

    @property
    def url(self):
        return url_for('photo', id=self.id)
    @property
    def thumbnail(self):
        return url_for('thumbnail', id=self.id)
    @property
    def slide(self):
        return url_for('slide', id=self.id)

    @property
    def page(self):
        return url_for('page', permalink = self.link.permalink)