#!/usr/bin/env python
# Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
# Copyright (C) 2008-2023 German Aerospace Center (DLR) and others.
# This program and the accompanying materials are made available under the
# terms of the Eclipse Public License 2.0 which is available at
# https://www.eclipse.org/legal/epl-2.0/
# This Source Code may also be made available under the following Secondary
# Licenses when the conditions for such availability set forth in the Eclipse
# Public License 2.0 are satisfied: GNU General Public License, version 2
# or later which is available at
# https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later

# @file    plot_csv_bars.py
# @author  Daniel Krajzewicz
# @date    2014-01-27

"""

This script plots name / value pairs from a given .csv file (';'-separated).
The values are plotted as bars.
matplotlib (http://matplotlib.org/) has to be installed for this purpose

"""
from __future__ import absolute_import
from __future__ import print_function

import os
import sys

sys.path.append(os.path.dirname(os.path.dirname(os.path.realpath(__file__))))
from sumolib.visualization import helpers  # noqa
from sumolib.options import ArgumentParser  # noqa
import matplotlib.pyplot as plt  # noqa


def main(args=None):
    """The main function; parses options and plots"""
    # ---------- build and read options ----------
    ap = ArgumentParser()
    ap.add_argument("-i", "--input", category="input", dest="input", metavar="FILE", type=ap.file,
                    help="Defines the csv file to use as input")
    ap.add_argument("--column", dest="column",
                    type=int, default=1, help="Selects the column to read values from")
    ap.add_argument("-r", "--revert", dest="revert", action="store_true",
                    default=False, help="Reverts the order of read values")
    ap.add_argument("-w", "--width", dest="width", category="visualization",
                    type=float, default=.8, help="Defines the width of the bars")
    ap.add_argument("--space", dest="space", category="visualization",
                    type=float, default=.2, help="Defines the space between the bars")
    ap.add_argument("--norm", dest="norm",
                    type=float, default=1., help="Divides the read numbers by this value before plotting them")
    ap.add_argument("--show-values", dest="showValues", action="store_true", category="visualization",
                    default=False, help="Shows the values")
    ap.add_argument("--values-offset", dest="valuesOffset", category="visualization",
                    type=float, default=1., help="Position offset for values")
    ap.add_argument("--vertical", dest="vertical", action="store_true", category="visualization",
                    default=False, help="vertical bars are used")
    ap.add_argument("-v", "--verbose", dest="verbose", action="store_true",
                    default=False, help="If set, the script says what it's doing")
    # standard plot options
    helpers.addInteractionOptions(ap)
    helpers.addPlotOptions(ap)
    # parse
    options = ap.parse_args(args=args)

    if options.input is None:
        raise ValueError("Error: at least one csv file must be given")

    labels = []
    vlabels = []
    vals = []
    total = 0
    xs = []
    ts = []
    s = options.width + options.space
    t = options.width / 2. + options.space / 2.
    x = options.space / 2.
    with open(options.input) as fd:
        for line in fd:
            v = line.strip().split(";")
            if len(v) < 2:
                continue
            labels.append(v[0].replace("\\n", "\n"))
            value = float(v[options.column]) / options.norm
            vals.append(value)
            vlabels.append(str(value) + "%")
            total += value
            xs.append(x)
            ts.append(t)
            x = x + s
            t = t + s

    if options.revert:
        labels.reverse()
        vals.reverse()
        vlabels.reverse()
    colors = []
    for i, e in enumerate(labels):
        colors.append(helpers.getColor(options, i, len(labels)))

    fig, ax = helpers.openFigure(options)
    if not options.vertical:
        rects = plt.barh(xs, vals, height=options.width)
        for i, rect in enumerate(rects):
            if options.showValues:
                width = rect.get_width()
                ax.text(width + options.valuesOffset, rect.get_y() +
                        rect.get_height() / 2., vlabels[i], va='center', ha='left')
            rect.set_color(colors[i])
            rect.set_edgecolor('k')
        plt.ylim(0, x)
        plt.yticks(ts, labels)
    else:
        rects = plt.bar(xs, vals, width=options.width)
        for i, rect in enumerate(rects):
            if options.showValues:
                height = rect.get_height()
                ax.text(rect.get_x() + rect.get_width() / 2., height +
                        options.valuesOffset, vlabels[i], ha='center', va='bottom')
            rect.set_color(colors[i])
            rect.set_edgecolor('k')
        plt.xlim(0, x)
        plt.xticks(ts, labels)
    helpers.closeFigure(fig, ax, options, False)


if __name__ == "__main__":
    try:
        main()
    except ValueError as e:
        sys.exit(e)