"""
This code sets up the game window, initializes the grid of cells with random live/dead values, defines a function to count live neighbors, and implements the main game loop that updates the grid and draws the cells on the screen.

The simulation features a grid of cells that can be either alive or dead, and updates based on the following rules:

    If a cell is alive and has fewer than two live neighbors, it dies (underpopulation).
    If a cell is alive and has two or three live neighbors, it continues to live.
    If a cell is alive and has more than three live neighbors, it dies (overpopulation).
    If a cell is dead and has exactly three live neighbors, it becomes alive (reproduction).

First, you'll need to install Pygame by running 'pip install pygame' in your terminal.
"""

import pygame
import random

# Set up the game window
WINDOW_WIDTH = 800
WINDOW_HEIGHT = 800
CELL_SIZE = 10
ROWS = WINDOW_HEIGHT // CELL_SIZE
COLS = WINDOW_WIDTH // CELL_SIZE

pygame.init()
pygame.display.set_caption("Life Simulation")
window = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))

# Initialize the grid of cells
grid = [[random.choice([0, 1]) for _ in range(COLS)] for _ in range(ROWS)]

# Define a function to count the number of live neighbors of a given cell
def count_live_neighbors(row, col):
    count = 0
    for i in range(-1, 2):
        for j in range(-1, 2):
            if not (i == 0 and j == 0) and 0 <= row + i < ROWS and 0 <= col + j < COLS:
                count += grid[row + i][col + j]
    return count

# Define the main game loop
while True:
    # Handle events
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()

    # Update the grid
    new_grid = [[0 for _ in range(COLS)] for _ in range(ROWS)]
    for row in range(ROWS):
        for col in range(COLS):
            live_neighbors = count_live_neighbors(row, col)
            if grid[row][col] == 1 and (live_neighbors < 2 or live_neighbors > 3):
                new_grid[row][col] = 0
            elif grid[row][col] == 0 and live_neighbors == 3:
                new_grid[row][col] = 1
            else:
                new_grid[row][col] = grid[row][col]
    grid = new_grid

    # Draw the cells on the screen
    window.fill((255, 255, 255))
    for row in range(ROWS):
        for col in range(COLS):
            if grid[row][col] == 1:
                pygame.draw.rect(window, (0, 0, 0), (col * CELL_SIZE, row * CELL_SIZE, CELL_SIZE, CELL_SIZE))
    pygame.display.update()