import pygame
import math

cell_size = 18

grid_x_count = 19
grid_y_count = 14

def update():
    global selected_x
    global selected_y

    mouse_x, mouse_y = pygame.mouse.get_pos()
    selected_x = math.floor(mouse_x / cell_size)
    selected_y = math.floor(mouse_y / cell_size)

    if selected_x > grid_x_count - 1:
        selected_x = grid_x_count - 1
    if selected_y > grid_y_count - 1:
        selected_y = grid_y_count - 1

def draw():
    screen.fill((0, 0, 0))

    for y in range(grid_y_count):
        for x in range(grid_x_count):
            screen.blit('covered', (x * cell_size, y * cell_size))

    # Temporary
    screen.draw.text(
        'selected x: ' + str(selected_x) + 'selected y: ' + str(selected_y),
        (0, 0), color=(0, 0, 0)
    )