import pygame, sys, random
from pygame.math import Vector2
from Debug import debug

pygame.init()
cell_size = 40
cell_number = 20
clock = pygame.time.Clock()
screen_width,screen_height = cell_number*cell_size,cell_number*cell_size
screen = pygame.display.set_mode((screen_width,screen_height))

class SNAKE():
    def __init__(self):
        self.body = [Vector2(5,10),Vector2(6,10),Vector2(7,10)]
        self.direction = Vector2(1,0)
        self.new_block = False

    def draw_snake(self):
        for block in self.body:
            x_pos = int(block.x*cell_size)
            y_pos = int(block.y*cell_size)
            block_rect = pygame.Rect(x_pos, y_pos,cell_size,cell_size)
            pygame.draw.rect(screen,(133,111,122), block_rect)

    def move_snake(self):
        if self.new_block  == True:
            body_copy = self.body[:]
            body_copy.insert(0,body_copy[0]+ self.direction)
            self.body = body_copy[:]
            self.new_block = False
        else:
            body_copy = self.body[:-1]
            body_copy.insert(0,body_copy[0]+ self.direction)
            self.body = body_copy[:]

    def add_block(self):
        self.new_block = True

class FRUIT():
    def __init__(self):
        self.randomize()

    def draw_fruit(self):
        fruit_rect = pygame.Rect(int(self.pos.x *cell_size),int(self.pos.y * cell_size),cell_size,cell_size)
        pygame.draw.rect(screen, (126,166,140), fruit_rect)

    def randomize(self):
        self.x = random.randint(0,cell_number - 1)
        self.y = random.randint(0,cell_number - 1)
        self.pos = Vector2(self.x,self.y)



class MAIN():
    def __init__(self):
        self.snake = SNAKE()
        self.fruit = FRUIT()
        
    def update(self):
        self.snake.move_snake()
        self.check_collision()
        self.check_fail()

    def draw_elements(self):
        self.fruit.draw_fruit()
        self.snake.draw_snake()

    def check_collision(self):
        if self.fruit.pos == self.snake.body[0]:
            self.fruit.randomize()
            self.snake.add_block()
    
    def check_fail(self):
        if not 0 <= self.snake.body[0].x <= cell_number:
            self.game_over()

    def game_over():
        pygame.quit()
        sys.exit()

SCREEN_UPDATE = pygame.USEREVENT
pygame.time.set_timer(SCREEN_UPDATE,150)

main_game = MAIN()

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        if event.type == SCREEN_UPDATE:
            main_game.update()
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_w:
                main_game.snake.direction = Vector2(0,-1)
            if event.key == pygame.K_s:
                main_game.snake.direction = Vector2(0,1)
            if event.key == pygame.K_a:
                main_game.snake.direction = Vector2(-1,0)
            if event.key == pygame.K_d:
                main_game.snake.direction = Vector2(1,0)

    screen.fill((175,215,70))
    main_game.draw_elements()
    pygame.display.update()
    clock.tick(60)