Timer

from tkinter import *
import math

# ---------------------------- CONSTANTS ------------------------------- #
PINK = "#e2979c"
RED = "#e7305b"
GREEN = "#9bdeac"
YELLOW = "#f7f5dd"
FONT_NAME = "Courier"
WORK_MIN = 25
SHORT_BREAK_MIN = 5
LONG_BREAK_MIN = 20

# ---------------------------- GLOBAL VARIABLES ------------------------------- #
reps = 0
timer = None

# ---------------------------- TIMER RESET ------------------------------- #
def reset():
    global timer, reps
    if timer:
        window.after_cancel(timer)
    canvas.itemconfig(timer_text, text="00:00")
    label.config(text="Timer")
    reps = 0
    timer = None

# ---------------------------- TIMER MECHANISM ------------------------------- #
def start_timer():
    global reps, timer
    reps += 1

    work_sec = WORK_MIN * 60
    short_break_sec = SHORT_BREAK_MIN * 60
    long_break_sec = LONG_BREAK_MIN * 60

    if reps % 8 == 0:
        countdown(long_break_sec)
        label.config(text="Long Break", fg=RED)
    elif reps % 2 == 0:
        countdown(short_break_sec)
        label.config(text="Short Break", fg=PINK)
    else:
        countdown(work_sec)
        label.config(text="Work", fg=GREEN)

# ---------------------------- COUNTDOWN MECHANISM ------------------------------- #
def countdown(count):
    global timer
    count_min = math.floor(count / 60)
    count_sec = count % 60
    canvas.itemconfig(timer_text, text=f"{count_min:02d}:{count_sec:02d}")
    if count > 0:
        timer = window.after(1000, countdown, count - 1)
    else:
        start_timer()

# ---------------------------- UI SETUP ------------------------------- #
window = Tk()
window.title("Pomodoro")
window.config(padx=100, pady=50, bg=YELLOW)

label = Label(window, text="Timer", font=("Arial", 50, "bold"), fg=GREEN, bg=YELLOW)
label.grid(row=1, column=2)

button_start = Button(text="Start", command=start_timer)
button_start.grid(row=3, column=1)

button_reset = Button(text="Reset", command=reset)
button_reset.grid(row=3, column=3)

canvas = Canvas(width=200, height=224, bg=YELLOW, highlightthickness=0)
tomato_img = PhotoImage(file="tomato.png")
canvas.create_image(100, 112, image=tomato_img)

timer_text = canvas.create_text(100, 130, text="00:00", fill="white", font=("Arial", 35, "bold"))

canvas.grid(row=2, column=2)

window.mainloop()