#!/usr/bin/env python3
from argparse import ArgumentParser
from datetime import datetime
from os.path import exists
from platform import system
from subprocess import call
from time import sleep
import webbrowser


YEAR = 2018
CHARMS = {
    'Linux': '/usr/local/bin/charm',
    'Windows': r'C:\Program Files\JetBrains\PyCharm 2020.2.4\bin\pycharm64.exe'
}

arg_parser = ArgumentParser()
arg_parser.add_argument("-d", "--day", help="start a specific day (default: today)", type=int)
args = arg_parser.parse_args()

DAY = args.day or datetime.now().day

if YEAR < 2015 or not 1 <= DAY <= 25:
    print("Invalid year or day for year: %d, day: %d" % (YEAR, DAY))
    exit()

day_file = "day%02d.py" % DAY
if exists(day_file):
    print(day_file, "already exists. Use that one!")
    exit()

with open("skel_day.py", "r") as IN:
    with open(day_file, "w") as OUT:
        while in_line := IN.readline():
            OUT.write(in_line.replace("%YEAR%", str(YEAR)).replace("%DAY%", str(DAY)))

start = datetime(YEAR, 12, DAY, 6, 0, 0)
now = datetime.now()
if start > now:
    time_wait = start - now
    if time_wait.days > 0:
        print("Do you really want to wait %d days?" % time_wait.days)
        exit()

    for x in range(time_wait.seconds, -1, -1):
        print("Day starts in %02ds.\r")
        sleep(1)

call([CHARMS[system()], day_file])
webbrowser.open("https://adventofcode.com/%d/day/%d" % (YEAR, DAY))
call(["git", "add", day_file])