#!/usr/bin/env python3

from datetime import datetime
import matplotlib.pyplot as plt
import sys


def convert_param_to_dates(x):
    pair = x.split(',')
    first = datetime.fromtimestamp(int(pair[0].replace('(', '')))
    try:
        second = datetime.fromtimestamp(int(pair[1].replace(')', '')))
    except(ValueError):
        second = datetime.now()
    if first.day == second.day:
        return (first, second)
    else:
        midnight = datetime.fromisoformat(second.strftime('%FT') + "00:00:00")
        return [
            (first, midnight),
            (midnight, second)
        ]


def flatten(array):
    ret_arr = []
    for i in array:
        if type(i) == list:
            ret_arr += flatten(i)
        else:
            ret_arr.append(i)
    return ret_arr


def seconds_to_str(s):
    hours = int(s//3600)
    minutes = int(s//60 % 60)
    seconds = int(s % 60)
    return f"{hours:02}:{minutes:02}:{seconds:02}"


filename = sys.argv[1]
with open(filename) as f:
    contents = flatten(list(map(convert_param_to_dates, f.readlines())))

dates = []
times = []
current_date = contents[0][0]
time_in_s = 0
for i in contents:
    if i[0].strftime("%F") == current_date.strftime("%F"):
        diff = i[1] - i[0]
        time_in_s += diff.total_seconds()
    else:
        dates.append(current_date)
        times.append(time_in_s)
        current_date = i[0]
        diff = i[1] - i[0]
        time_in_s = diff.total_seconds()

dates.append(current_date)
times.append(time_in_s)

for date, s in zip(dates, times):
    print(date.strftime("%F"), "\t", seconds_to_str(s))

fig, ax = plt.subplots()
ax.xaxis.set_tick_params(which='major', rotation=90)
plt.bar(list(map(lambda x: x.strftime('%a %d/%m'), dates)),
        list(map(lambda x: x/3600, times)))
plt.show()