#!/usr/bin/env python

import argparse
import csv
import datetime
import pathlib

import matplotlib.pyplot as plt

def plot(paths):
    for path in paths:
        timestamps = [datetime.datetime.now()]
        with open(path) as f:
            reader = csv.reader(f)
            for (_, _, tstr) in reader:
                timestamp = datetime.datetime.strptime(tstr, "%d %b %y (%H:%M)")
                timestamps.append(timestamp)

        plt.stairs(range(1, len(timestamps)), edges=timestamps[::-1], baseline=None)

    plt.show()


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("-f", "--file", nargs='+', type=pathlib.Path, required=True, help="solve history CSV")

    args = parser.parse_args()
    plot(args.file)