# Your mission is to create a stopwatch program. this program should have start, stop, and lap options, and it should
# write out to a file to be viewed later.

import time
from datetime import timedelta


def set_time(start_time, round_number):
    stop_time = time.time()
    difference = stop_time - start_time
    displayed_time = str(timedelta(seconds=difference))

    with open("records.txt", "a") as records:
        records.write(f"{round_number}\t\t\t{displayed_time}\n")


def main():
    with open("records.txt","a") as records:
        records.write("Lap\t\t\tTime\n")

    round_number = 1

    print("Welcome to the Stopwatch program.")

    while True:
        command = input("You can [S]tart stopwatch and [S]top or take a [L]ap while stopwatch is running. Command ["
                        "R]records show them. You may leave program by [Q]uiting it.\n")
        if command == "S":
            running = True;
            start_time = time.time()
            while running:
                command = input("[S] to stop / [L] to take a lap\n")
                if command == "S":
                    set_time(start_time, round_number)
                    round_number += 1
                    break
                elif command == "L":
                    start_time = time.time()
                    set_time(start_time, round_number)
                    round_number += 1

        elif command == "L":
            print("Sorry, this can be used only while stopwatch is running. [S]tart it.")

        elif command == "R":
            with open("records.txt", "r") as records:
                for line in records:
                    print(line, end="")
        elif command == "Q":
            print("Thanks for using me! ^_^")
            break
        else:
            print("Sorry but I didn't understand your command. Provide it once more.")


if __name__ == "__main__":
    main()