import pygame, random
fps = 15

score = 0
record = 0

winWidth = 640
winHeight = 480
cellSize = 20
cellWidth = winWidth // cellSize
cellHeight = winHeight // cellSize
white = (255,255,255)
black = (0,0,0)
red = (255,0,0)
green = (0,255,0)
darkGreen = (0,155,0)
darkGray = (40,40,40)

def stopGame():
    pygame.quit()

def showStartScreen():
    while True:
        win.fill(black)
        gameName = font.render('SNAKE',True,green)
        gameNameRect = gameName.get_rect()
        gameNameRect.center=(winWidth//2,winHeight//2)
        win.blit(gameName,gameNameRect)

        gameName2 = font.render('Press key to play', True, red)
        gameNameRect2 = gameName2.get_rect()
        gameNameRect2.topleft = (winWidth - 200, winHeight - 30)
        win.blit(gameName2, gameNameRect2)

        for event in pygame.event.get():
            if event.type==pygame.QUIT:
                stopGame()
            elif event.type == pygame.KEYUP:
                return

        pygame.display.update()
        fpsClock.tick(fps)
def drawGrid():
    for x in range(0, winWidth, cellSize):
        pygame.draw.line(win, darkGray, (x, 0), (x, winHeight))
    for y in range(0, winHeight, cellSize):
        pygame.draw.line(win, darkGray, (0, y), (winWidth, y))
def getRandomLoc():
    x = random.randint(0, cellWidth-1)
    y = random.randint(0, cellHeight-1)
    return {'x':x, 'y':y}

def drawApple(appleCoord):
    x = appleCoord['x'] * cellSize
    y = appleCoord['y'] * cellSize
    appleRect = pygame.Rect(x, y, cellSize, cellSize)
    pygame.draw.rect(win, red, appleRect)
    
def drawSnake(snakeCoord):
    for coord in snakeCoord:
        x = coord['x'] * cellSize
        y = coord['y'] * cellSize
        snakeRect = pygame.Rect(x, y, cellSize, cellSize)
        pygame.draw.rect(win, darkGreen, snakeRect)
        snakeRect = pygame.Rect(x+4, y+4, cellSize-8, cellSize-8)
        pygame.draw.rect(win, green, snakeRect)

def drawScore(score,record):
    scoreText = font.render('Score: '+str(score), True, white)
    scoreRect = scoreText.get_rect()
    scoreRect = topleft = (winWidth-120,10)
    win.blit(scoreText, scoreRect)
    recordText = font.render('Record: '+str(record), True, white)
    recordRect = recordText.get_rect()
    recordRect = topleft = (10, 10)
    win.blit(recordText, recordRect)

    nameText = font.render('create by Maxim Kadolich', True, white)
    nameRect = nameText.get_rect()
    nameRect.topleft = (10,30)
    win.blit(nameText, nameRect)
def runGame():
    global score

    appleCoord = getRandomLoc()
    startx = random.randint(5, cellWidth-6)
    starty = random.randint(5, cellHeight-6)
    snakeCoord = [{'x':startx, 'y':starty},
                  {'x':startx-1, 'y':starty},
                  {'x':startx-2, 'y':starty}]
    direct = 'right'
    while True:

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                stopGame()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT and direct!='right':
                    direct = 'left'
                elif event.key == pygame.K_RIGHT and direct!='left':
                    direct = 'right'
                elif event.key == pygame.K_UP and direct!='down':
                    direct = 'up'
                elif event.key == pygame.K_DOWN and direct!='up':
                    direct = 'down'
                elif event.key == pygame.K_ESCAPE:
                    stopGame()

        if direct == 'up':
            new = {'x':snakeCoord[0]['x'],'y':snakeCoord[0]['y']-1}
        elif direct == 'down':
            new = {'x':snakeCoord[0]['x'],'y':snakeCoord[0]['y']+1}
        elif direct == 'right':
            new = {'x':snakeCoord[0]['x']+1,'y':snakeCoord[0]['y']}
        elif direct == 'left':
            new = {'x':snakeCoord[0]['x']-1,'y':snakeCoord[0]['y']}
        snakeCoord.insert(0,new)

        if snakeCoord[0]['x'] == appleCoord['x'] and snakeCoord[0]['y'] == appleCoord['y']:
           appleCoord = getRandomLoc()
        else:
            del snakeCoord[-1]

        if (snakeCoord[0]['x'] == -1 or snakeCoord[0]['x'] == cellWidth or snakeCoord[0]['y'] == -1 or
            snakeCoord[0]['y'] == -1 or snakeCoord[0]['y'] == cellHeight):
            return
        for coord in snakeCoord[1:]:
            if coord['x'] ==snakeCoord[0]['x'] and coord['y'] and coord['y'] == snakeCoord[0]['y']:
                return

        win.fill(black)
        drawGrid()

        drawApple(appleCoord)
        drawSnake(snakeCoord)
        score = len(snakeCoord)-3
        drawScore(score,record)

        pygame.display.update()
        fpsClock.tick(fps)

pygame.init()
fpsClock = pygame.time.Clock()
win = pygame.display.set_mode((winWidth,winHeight))
pygame.display.set_caption('Змейка спасет мир')
font=pygame.font.Font('freesansbold.ttf',18)
showStartScreen()


while True:
    try:
        f = open('record.txt','r')
        record = int(f.readline())
        f.close()
    except:
        f = open('record.txt','w')
        f.write('0')
        f.close()
        record = 0
    runGame()
    if score > record:
        f = open('record.txt', 'w')
        f.write(str(score))
        f.close()