#!/usr/bin/env python

import os, sys, tempfile

try:
    import matplotlib.pyplot as plt
    import numpy as np
    import pandas as pd
except ImportError as e:
    print("You need to install the Python packages matplotlib and pandas")
    print("e.g., `pip install --user matplotlib pandas`")
    sys.exit(1)

(_, tracefile) = tempfile.mkstemp(suffix = ".csv")
print("hept-plot: saving trace to {}".format(tracefile))
os.system("HEPT_TRACE=\"{}\" {}".format(tracefile, " ".join(sys.argv[1:])))

try:
    trace = pd.read_csv(tracefile)
    trace = trace.loc[:, ~trace.columns.str.contains('^Unnamed')]
    trace.plot(kind = 'line')
    plt.legend(loc = 'upper left')
    plt.show()
except pd.errors.EmptyDataError:
    print("hept-plot: nothing to plot")
    sys.exit(0)