# coding utf-8

# classes/context.py

# class:: Context

from datetime import datetime

import json

from swtstore.classes import db

from swtstore.classes.models.types import JSONType

from swtstore.classes.exceptions import AlreadyExistsError

class Context(db.Model):

    """ docstring """

    __tablename__ = 'contexts'

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

    name = db.Column(db.String(256), nullable=False, unique=True)

    definition = db.Column(JSONType, nullable=False)

    created = db.Column(db.DateTime, default=datetime.utcnow)

    modified = db.Column(db.DateTime, default=None)

    def __init__(self, name, definition):

        for context in Context.query.all():

            if name == context.name:

                raise AlreadyExistsError('Context with name exists!')

                return

        self.name = name

        self.definition = definition

    def __repr__(self):

        print 'Context Object: <%s>' % self.name

    def __str__(self):

        return 'Context Object: <%s>' % self.name

    def persist(self):

        db.session.add(self)

        try:

            db.session.commit()

        except IntegrityError:

            raise AlreadyExistsError('Error')

    # return a context instance given a name

    @staticmethod

    def getContextByName(name):

        return Context.query.filter_by(name=name).first()