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import pygame
import random

snakeColor = (255,255,255)
foodColor = (255,255,0)
width = 600
height = 600
grid = 20
direction = 'up'

openWindow = True

canvas = pygame.display.set_mode((width,height))
pygame.display.set_caption('Snake')

class Square():
    def __init__(self, x, y, color):
        self.x = x
        self.y = y
        self.color = color

    def show(self):
        pygame.draw.rect(canvas, self.color, (self.x * grid, self.y * grid, grid, grid), 0)

class Food():
    def __init__(self, color):
        self.color = color

    def showFoodRandomly(self):
        self.x = random.randrange(0, width, grid)
        self.y = random.randrange(0, height, grid)
        pygame.draw.rect(canvas, self.color, (self.x, self.y, grid, grid), 0)

class Snake():
    def __init__(self):
        self.x = 1
        self.y = 1
        self.speed = 1
        self.color = snakeColor

    def updateSnake(self):
        if direction == 'up':
            self.y = self.y - self.speed * grid
        if direction == 'down':
            self.y = self.y + self.speed * grid
        if direction == 'left':
            self.x = self.x - self.speed * grid
        if direction == 'right':
            self.x = self.x + self.speed * grid

    def showSnake(self):
        pygame.draw.rect(canvas, self.color, (self.x, self.y, grid, grid), 0)


def keyPressed():
    if (pygame.key.name == 'K_UP'):
        direction = 'up'
    elif (pygame.key.name == 'K_DOWN'):
        direction = 'down'
    elif (pygame.key.name == 'K_RIGHT'):
        direction = 'right'
    elif (pygame.key.name == 'K_LEFT'):
        direction = 'left'



food = Food(foodColor)
food.showFoodRandomly()
s = Snake()



pygame.display.flip()
while openWindow == True:
    keyPressed()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            openWindow = False
        else:
            s.updateSnake()
            s.showSnake()