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import pygame
import random
import time

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')
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 randomizeFood(self):
        x = random.randrange(0, width, grid)
        y = random.randrange(0, height, grid)

        return x, y

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

class Snake():
    def __init__(self):

        self.x = 6
        self.y = 6
        self.speed = 1
        self.color = snakeColor

        snake.append(Square(self.x, self.y, snakeColor))
        snake.append(Square(self.x, self.y + 1, snakeColor))
        snake.append(Square(self.x, self.y + 2, snakeColor))


    def updateSnake(self, direction):
        if direction == 'up':

            snakeHead = Square(self.x, self.y - self.speed, snakeColor)
            print(direction)
        if direction == 'down':
            snakeHead = Square(self.x, self.y + self.speed, snakeColor)
            print(direction)
        if direction == 'left':
            snakeHead = Square(self.x - self.speed, self.y, snakeColor)
            print(direction)
        if direction == 'right':
            snakeHead = Square(self.x + self.speed, self.y, snakeColor)
            print(direction)

        snake.insert(0, snakeHead)
        eatFood()


    def showSnake(self):
        MAX_X = width/grid
        MAX_Y = height/grid
        if self.x >= MAX_X:
            self.x = MAX_X-1
        if self.x <= 0:
            self.x = 0

        if self.y >= MAX_Y:
            self.y = MAX_Y-1
        if self.y <= 0:
            self.y = 0

        pygame.draw.rect(canvas, self.color, (self.x*grid, self.y*grid, grid, grid), 0)
        return self.x*grid, self.y*grid

def keyPressed():
    keys = pygame.key.get_pressed()
    global direction

    if (keys[pygame.K_RIGHT]):
        direction = 'right'
    if (keys[pygame.K_LEFT]):
        direction = 'left'
    if (keys[pygame.K_UP]):
        direction = 'up'
    if (keys[pygame.K_DOWN]):
        direction = 'down'

    return direction

def eatFood():
    global xFood, yFood
    xSnake, ySnake = s.showSnake()

    if xFood == xSnake and yFood == ySnake:
        xFood, yFood = f.randomizeFood()
    else:
        snake.pop()


    f.showFood(xFood, yFood)

f = Food(foodColor)
s = Snake()

xFood, yFood = 40,40

while openWindow == True:
    canvas.fill((0,0,0))
    snakeDir = keyPressed()

    s.updateSnake(snakeDir)
    s.showSnake()


    pygame.display.flip()
    time.sleep(0.1)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            openWindow = False