from datetime import datetime

from opendc.models_old.authorization import Authorization
from opendc.models_old.datacenter import Datacenter
from opendc.models_old.path import Path
from opendc.models_old.section import Section
from opendc.models_old.simulation import Simulation
from opendc.models_old.user import User
from opendc.util import database, exceptions
from opendc.util.rest import Response


def POST(request):
    """Create a new simulation, and return that new simulation."""

    # Make sure required parameters are there

    try:
        request.check_required_parameters(body={'simulation': {'name': 'string'}})

    except exceptions.ParameterError as e:
        return Response(400, str(e))

    # Instantiate a Simulation

    simulation_data = request.params_body['simulation']

    simulation_data['datetimeCreated'] = database.datetime_to_string(datetime.now())
    simulation_data['datetimeLastEdited'] = database.datetime_to_string(datetime.now())

    simulation = Simulation.from_JSON(simulation_data)

    # Insert this Simulation into the database

    simulation.insert()

    # Instantiate an Authorization and insert it into the database

    authorization = Authorization(user_id=User.from_google_id(request.google_id).id,
                                  simulation_id=simulation.id,
                                  authorization_level='OWN')

    authorization.insert()

    # Instantiate a Path and insert it into the database

    path = Path(simulation_id=simulation.id, datetime_created=database.datetime_to_string(datetime.now()))

    path.insert()

    # Instantiate a Datacenter and insert it into the database

    datacenter = Datacenter(starred=0, simulation_id=simulation.id)

    datacenter.insert()

    # Instantiate a Section and insert it into the database

    section = Section(path_id=path.id, datacenter_id=datacenter.id, start_tick=0)

    section.insert()

    # Return this Simulation

    return Response(200, 'Successfully created {}.'.format(simulation), simulation.to_JSON())