#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.org/sumo
# Copyright (C) 2012-2019 German Aerospace Center (DLR) and others.
# This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v2.0
# which accompanies this distribution, and is available at
# http://www.eclipse.org/legal/epl-v20.html
# SPDX-License-Identifier: EPL-2.0

# @file    plotXMLAttr.py
# @author  Jakob Erdmann
# @date    2017-12-04
# @version $Id$

"""generate boxplot for an aribitrary xml attribute"""

from __future__ import absolute_import
from __future__ import print_function
import os
import sys
sys.path.append(os.path.join(os.path.dirname(sys.argv[0]), '..'))
from sumolib.output import parse  # noqa
from sumolib.miscutils import Statistics  # noqa


def main(tag, attr, *xmlfiles):
    data = []
    for xmlfile in xmlfiles:
        stats = Statistics('%s %s' % (tag, attr))
        for elem in parse(xmlfile, tag):
            stats.add(float(elem.getAttribute(attr)), elem.id)
        print(stats)
        data.append(stats.values)
    try:
        import matplotlib.pyplot as plt
    except Exception as e:
        sys.exit(e)
    plt.figure()
    plt.xticks(range(len(xmlfiles)), xmlfiles)
    plt.ylabel("%s %s" % (tag, attr))
    plt.boxplot(data)
    plt.show()


if __name__ == "__main__":
    if len(sys.argv) < 4:
        sys.exit("usage: %s <tag> <attr> <xmlfile>*" % __file__)
    main(*sys.argv[1:])
