main.py

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
reps = 0
timer =None

# ---------------------------- TIMER RESET ------------------------------- #
def reset_timer():
    window.after_cancel(timer)
    canvas.itemconfig(timer_text, text=f"00:00")
    title_label.config(text='Timer')
    check_mark.config(text='')
    global reps
    reps = 0
# ---------------------------- TIMER MECHANISM ------------------------------- # 

def start_timer():
    global reps
    work_sec = WORK_MIN * 60
    short_break_sec = SHORT_BREAK_MIN * 60
    long_break_sec = LONG_BREAK_MIN * 60
    reps += 1
    if reps == 8:
        count_down(long_break_sec)
        title_label.config(text='Break', fg=RED)
    elif reps % 2 == 0:
        count_down(short_break_sec)
        title_label.config(text='Break', fg=PINK)
    else:
        count_down(work_sec)
        title_label.config(text='Work!', fg=GREEN)


# ---------------------------- COUNTDOWN MECHANISM ------------------------------- #
def count_down(count):
    count_min = math.floor(count / 60)
    count_sec = count % 60
    if count_sec <= 9:
        count_sec = '0' + str(count_sec)

    canvas.itemconfig(timer_text, text=f"{count_min}:{count_sec}")
    if count > 0:
        global timer
        timer = window.after(1000, count_down, count - 1)
    else:
        start_timer()
        mark = ""
        for _ in range(math.floor(reps/2)):
            mark +='✔'
        check_mark.config(text=mark)

# ---------------------------- UI SETUP ------------------------------- #

from tkinter import *

window = Tk()
window.title('Pomodoro')
window.config(padx=100, pady=50, bg=YELLOW)

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=(FONT_NAME, 35, 'bold'))
canvas.grid(column=1, row=1)

# Labels
title_label = Label(text="Timer", fg=GREEN, bg=YELLOW, font=(FONT_NAME, 35, 'bold'))
title_label.grid(column=1, row=0)

# buttons

start_button = Button(text='Start', bg=YELLOW, highlightbackground=YELLOW, font=(FONT_NAME, 9, 'bold'),
                      command=start_timer)
start_button.grid(column=0, row=2)

reset_button = Button(text='reset', bg=YELLOW, highlightbackground=YELLOW, font=(FONT_NAME, 9, 'bold'),
                      command=reset_timer)
reset_button.grid(column=2, row=2)

check_mark = Label(text="", fg=GREEN, bg=YELLOW)
check_mark.grid(column=1, row=3)


window.mainloop()