import curses
import random

import numpy as np


def main(stdscr):
    curses.curs_set(0)  # Hide cursor
    stdscr.nodelay(True)  # Don't block I/O calls
    stdscr.timeout(100)  # Refresh rate

    # Initialize the board
    h, w = 20, 40  # Board dimensions
    board = np.zeros((h, w), dtype=int)
    snake = [(h // 2, w // 2)]
    board[h // 2, w // 2] = 1
    food = (random.randint(0, h - 1), random.randint(0, w - 1))
    board[food] = 2  # Food position
    direction = (0, 1)  # Initial direction (right)

    while True:
        # Input handling
        key = stdscr.getch()
        if key in [ord("q"), ord("Q")]:
            break
        elif key in [ord("a"), ord("A")] and direction != (0, 1):
            direction = (0, -1)
        elif key in [ord("d"), ord("D")] and direction != (0, -1):
            direction = (0, 1)
        elif key in [ord("w"), ord("W")] and direction != (1, 0):
            direction = (-1, 0)
        elif key in [ord("s"), ord("S")] and direction != (-1, 0):
            direction = (1, 0)
        elif key == ord(" "):  # Pause
            stdscr.nodelay(False)
            stdscr.getch()
            stdscr.nodelay(True)

        # Update snake position
        head = (snake[0][0] + direction[0], snake[0][1] + direction[1])
        head = (head[0] % h, head[1] % w)  # Torus wrapping

        if head in snake:  # Check self-collision
            break

        snake.insert(0, head)  # Move head
        if head == food:  # Check food collision
            food = (random.randint(0, h - 1), random.randint(0, w - 1))
            while food in snake:
                food = (random.randint(0, h - 1), random.randint(0, w - 1))
        else:
            tail = snake.pop()
            board[tail] = 0

        board[head] = 1
        board[food] = 2

        # Draw the board
        stdscr.clear()
        for i in range(h):
            for j in range(w):
                char = " " if board[i, j] == 0 else "*" if board[i, j] == 1 else "O"
                stdscr.addch(i, j, char)
        stdscr.refresh()


curses.wrapper(main)