# -*- coding: utf-8 -*-
"""Models relating to tracking information on .mit.edu hostname requests."""

from sqlalchemy import *
from sqlalchemy.orm.exc import NoResultFound
import sqlalchemy.orm
sqlalchemy.orm.ScopedSession = sqlalchemy.orm.scoped_session
from elixir import (ManyToOne, Entity, Field, OneToMany,
                    using_options, using_table_options,
                    ManyToMany, setup_all,
                    drop_all, create_all, session)
import random, hmac, hashlib

def tname(typ):
    return typ.__name__.lower()

class Meta(Entity):
    using_options(tablename=tname)
    using_table_options(mysql_engine='InnoDB',mysql_charset='utf8')

    # Secret key
    secret = Field(Binary(8),required=True)

    def __init__(self):
        self.secret = ''.join(chr(random.randint(0,255)) for x in xrange(8))

    @staticmethod
    def token_for_user(user):
        return hmac.new(Meta.get().secret,user,hashlib.sha1).hexdigest()

    @staticmethod
    def get():
        try:
            return Meta.query.one()
        except NoResultFound:
            return Meta()

setup_all()