#!/usr/bin/env python
"""
@file    plot_csv_timeline.py
@author  Daniel Krajzewicz
@author  Laura Bieker
@date    2014-01-14
@version $Id: plot_csv_timeline.py 20433 2016-04-13 08:00:14Z behrisch $


This script plots selected columns from a given .csv file (';'-separated).
The loaded time lines are visualised as lines.
matplotlib (http://matplotlib.org/) has to be installed for this purpose


SUMO, Simulation of Urban MObility; see http://sumo.dlr.de/
Copyright (C) 2014-2016 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.
"""
from __future__ import absolute_import
from __future__ import print_function

import os
import subprocess
import sys
import random
import csv

sys.path.append(os.path.dirname(os.path.dirname(os.path.realpath(__file__))))
import sumolib
from sumolib.visualization import helpers

import matplotlib.pyplot as plt


def readValues(file, verbose, columns):
    if verbose:
        print("Reading '%s'..." % f)
    ret = {}
    with open(file, 'rb') as f:
        reader = csv.reader(f, delimiter=';')
        for row in reader:
            if columns == None:
                columns = range(0, len(row))
            for i in columns:
                if i not in ret:
                    ret[i] = []
                ret[i].append(float(row[i]))
    return ret


def main(args=None):
    """The main function; parses options and plots"""
    # ---------- build and read options ----------
    from optparse import OptionParser
    optParser = OptionParser()
    optParser.add_option("-i", "--input", dest="input", metavar="FILE",
                         help="Defines the input file to use")
    optParser.add_option("-v", "--verbose", dest="verbose", action="store_true",
                         default=False, help="If set, the script says what it's doing")
    optParser.add_option("-c", "--columns", dest="columns",
                         default=None, help="Defines which columns shall be plotted")
    # standard plot options
    helpers.addInteractionOptions(optParser)
    helpers.addPlotOptions(optParser)
    # parse
    options, remaining_args = optParser.parse_args(args=args)

    if options.input == None:
        print("Error: an input file must be given")
        sys.exit(1)

    minV = 0
    maxV = 0
    if options.columns != None:
        options.columns = [int(i) for i in options.columns.split(",")]
    nums = readValues(options.input, options.verbose, options.columns)
    for f in nums:
        maxV = max(maxV, len(nums[f]))
    ts = range(minV, maxV + 1)

    fig, ax = helpers.openFigure(options)
    for i in nums:
        v = nums[i]
        ci = i
        if options.columns != None:
            ci = options.columns.index(i)
        c = helpers.getColor(options, ci, len(nums))
        l = helpers.getLabel(str(i), ci, options)
        plt.plot(ts[0:len(v)], v, label=l, color=c)
    helpers.closeFigure(fig, ax, options)

if __name__ == "__main__":
    sys.exit(main(sys.argv))
