# -*- coding: utf-8 -*-
"""
@file    multientryexit.py
@author  Michael Behrisch
@date    2011-03-16
@version $Id: multientryexit.py 18096 2015-03-17 09:50:59Z behrisch $

Python implementation of the TraCI interface.

SUMO, Simulation of Urban MObility; see http://sumo.dlr.de/
Copyright (C) 2011-2015 DLR (http://www.dlr.de/) and contributors

This file is part of SUMO.
SUMO is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
"""
import traci
import traci.constants as tc

_RETURN_VALUE_FUNC = {tc.ID_LIST:                          traci.Storage.readStringList,
                      tc.ID_COUNT:                         traci.Storage.readInt,
                      tc.LAST_STEP_VEHICLE_NUMBER:         traci.Storage.readInt,
                      tc.LAST_STEP_MEAN_SPEED:             traci.Storage.readDouble,
                      tc.LAST_STEP_VEHICLE_ID_LIST:        traci.Storage.readStringList,
                      tc.LAST_STEP_VEHICLE_HALTING_NUMBER: traci.Storage.readInt}
subscriptionResults = traci.SubscriptionResults(_RETURN_VALUE_FUNC)


def _getUniversal(varID, detID):
    result = traci._sendReadOneStringCmd(
        tc.CMD_GET_MULTI_ENTRY_EXIT_DETECTOR_VARIABLE, varID, detID)
    return _RETURN_VALUE_FUNC[varID](result)


def getIDList():
    """getIDList() -> list(string)

    Returns a list of ids of all multi-entry/multi-exit (e3) detectors within the scenario.
    """
    return _getUniversal(tc.ID_LIST, "")


def getIDCount():
    """getIDCount() -> integer

    Returns the number of multi-entry/multi-exit detectors in the network.
    """
    return _getUniversal(tc.ID_COUNT, "")


def getLastStepVehicleNumber(detID):
    """getLastStepVehicleNumber(string) -> integer

    Returns the number of vehicles that have been within the named multi-entry/multi-exit detector within the last simulation step.
    """
    return _getUniversal(tc.LAST_STEP_VEHICLE_NUMBER, detID)


def getLastStepMeanSpeed(detID):
    """getLastStepMeanSpeed(string) -> double

    Returns the mean speed in m/s of vehicles that have been within the named multi-entry/multi-exit detector within the last simulation step. 
    """
    return _getUniversal(tc.LAST_STEP_MEAN_SPEED, detID)


def getLastStepVehicleIDs(detID):
    """getLastStepVehicleIDs(string) -> list(string)

    Returns the list of ids of vehicles that have been within the named multi-entry/multi-exit detector in the last simulation step.
    """
    return _getUniversal(tc.LAST_STEP_VEHICLE_ID_LIST, detID)


def getLastStepHaltingNumber(detID):
    """getLastStepHaltingNumber(string) -> integer

    Returns the number of vehicles which were halting during the last time step.
    """
    return _getUniversal(tc.LAST_STEP_VEHICLE_HALTING_NUMBER, detID)


def subscribe(detID, varIDs=(tc.LAST_STEP_VEHICLE_NUMBER,), begin=0, end=2**31 - 1):
    """subscribe(string, list(integer), double, double) -> None

    Subscribe to one or more detector values for the given interval.
    """
    traci._subscribe(
        tc.CMD_SUBSCRIBE_MULTI_ENTRY_EXIT_DETECTOR_VARIABLE, begin, end, detID, varIDs)


def getSubscriptionResults(detID=None):
    """getSubscriptionResults(string) -> dict(integer: <value_type>)

    Returns the subscription results for the last time step and the given detector.
    If no detector id is given, all subscription results are returned in a dict.
    If the detector id is unknown or the subscription did for any reason return no data,
    'None' is returned.
    It is not possible to retrieve older subscription results than the ones
    from the last time step.
    """
    return subscriptionResults.get(detID)


def subscribeContext(detID, domain, dist, varIDs=(tc.LAST_STEP_VEHICLE_NUMBER,), begin=0, end=2**31 - 1):
    traci._subscribeContext(
        tc.CMD_SUBSCRIBE_MULTI_ENTRY_EXIT_DETECTOR_CONTEXT, begin, end, detID, domain, dist, varIDs)


def getContextSubscriptionResults(detID=None):
    return subscriptionResults.getContext(detID)
