from sqlalchemy import create_engine, Table, Column, Text, String, Integer, DateTime, JSON, ForeignKey
from sqlalchemy.orm import relationship
import sqlalchemy.sql.functions as func
from sqlalchemy_utc import UtcDateTime, utcnow
from wtforms_alchemy import ModelForm

from app.sql.common import db, Base, Session
# from app.sql.models.graph import Graph
# from app.sql.models.page import Page

from app.settings import app_cfg

from os.path import join

class Tile(Base):
  """Table for storing references to tiles"""
  __tablename__ = 'tile'
  id = Column(Integer, primary_key=True)
  graph_id = Column(Integer, ForeignKey('graph.id'), nullable=True)
  page_id = Column(Integer, ForeignKey('page.id'), nullable=True)
  target_page_id = Column(Integer, ForeignKey('page.id'), nullable=True)
  type = Column(String(16, convert_unicode=True), nullable=False)
  settings = Column(JSON, default={}, nullable=True)
  created_at = Column(UtcDateTime(), default=utcnow())
  updated_at = Column(UtcDateTime(), onupdate=utcnow())

  def toJSON(self):
    return {
      'id': self.id,
      'graph_id': self.graph_id,
      'page_id': self.page_id,
      'target_page_id': self.target_page_id,
      'type': self.type,
      'settings': self.settings,
      'created_at': self.created_at,
      'updated_at': self.updated_at,
    }

class TileForm(ModelForm):
  class Meta:
    model = Tile
    exclude = ['settings', 'created_at', 'updated_at']
  def get_session():
    return Session()