#!/usr/bin/env python3

# This script prints the time remaining for the current timer
# as stored in the file ~/.timer as a binary unix timestamp.

import time
import datetime

# Get the time stored in the file ~/.timer
try:
    with open("/home/ezri/.timer", "br") as f:
        timer = f.read()
except FileNotFoundError:
    print("It's Time!", flush=True)
    exit()

# Convert the binary unix timestamp to a datetime object
timer = datetime.datetime.fromtimestamp(int.from_bytes(timer, "big"))

while True:
    # Get the current time
    now = datetime.datetime.now()

    # Calculate the time remaining
    remaining = timer - now

    # If the timer has already expired, delete the file and exit
    if remaining.total_seconds() <= 0:
        import os

        os.remove("/home/ezri/.timer")
        print("Timer expired.")

    # Print the time remaining in the format "D days, HH:MM:SS"
    if remaining.days == 0:
        print(
            "{} hours {:02d}:{:02d}".format(
                remaining.seconds // 3600,
                remaining.seconds % 3600 // 60,
                remaining.seconds % 60,
            ),
            flush=True,
        )
    else:
        print(
            "{} days, {:02d}:{:02d}:{:02d}".format(
                remaining.days,
                remaining.seconds // 3600,
                remaining.seconds % 3600 // 60,
                remaining.seconds % 60,
            ),
            flush=True,
        )

    # Wait half a second before printing the time again
    time.sleep(1)