import pygame, random
fps=10
record=0
score=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)
yellow=(255,255,0)

bgColor=black

def stopGame():
    pygame.quit()

def showStartScreen():
    while True:
        win.fill(bgColor)
        gameName=font.render('SNAKE',True,green)
        gameNameRect=gameName.get_rect()
        gameNameRect.center=(winWidth//2,winHeight//2)
        win.blit(gameName,gameNameRect)
        pressKeyPlay=font.render('press a key to play',True,darkGray)
        pressKeyPlayRect=pressKeyPlay.get_rect()
        pressKeyPlayRect.topleft=(winWidth-200,winHeight-30)
        win.blit(pressKeyPlay,pressKeyPlayRect)

        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 getRandomLockApple():
    return{'x':random.randint(0,cellWidth-1),'y':random.randint(0,cellHeight-1)}
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
        segmentRect=pygame.Rect(x,y,cellSize,cellSize)
        pygame.draw.rect(win,darkGreen,segmentRect)
        innerRect=pygame.Rect(x+4,y+4,cellSize-8,cellSize-8)
        pygame.draw.rect(win,green,innerRect)

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

    recordText = font.render('Record: ' + str(record), True, yellow)
    recordRect = recordText.get_rect()
    recordRect.topleft = (10, 10)
    win.blit(recordText, recordRect)

    nameText=font.render('Aniskov Mikhail',True,white)
    nameRect=nameText.get_rect()
    nameRect.topleft=(10,winHeight-20)
    win.blit(nameText,nameRect)

def runGame():
    global record, score
    try:
        f=open('record.txt','r')
        record=int(f.readline())
        f.close()
    except:
        f = open('record.txt', 'w')
        f.write(str('0'))
        f.close()
        record=0

    appleCoord=getRandomLockApple()
    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}]
    direction='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 direction!='right':
                    direction='left'
                elif event.key==pygame.K_RIGHT and direction!='left':
                    direction='right'
                elif event.key==pygame.K_UP and direction!='down':
                    direction='up'
                elif event.key==pygame.K_DOWN and direction!='up':
                    direction='down'
                elif event.key==pygame.K_ESCAPE:
                    stopGame()

        if snakeCoord[0]['x']==-1 or snakeCoord[0]['x']==cellWidth 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']==snakeCoord[0]['y']:
                return

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

        if direction=='up':
            newHead={'x':snakeCoord[0]['x'],'y':snakeCoord[0]['y']-1}
        elif direction=='down':
            newHead={'x':snakeCoord[0]['x'],'y':snakeCoord[0]['y']+1}
        elif direction=='left':
            newHead={'x':snakeCoord[0]['x']-1,'y':snakeCoord[0]['y']}
        elif direction=='right':
            newHead={'x':snakeCoord[0]['x']+1,'y':snakeCoord[0]['y']}
        snakeCoord.insert(0,newHead)
        win.fill(black)
        drawGrid()
        drawSnake(snakeCoord)
        drawApple(appleCoord)
        drawScore(len(snakeCoord)-3,record)
        score=len(snakeCoord)-3

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

pygame.init()
fpsClock=pygame.time.Clock()
win=pygame.display.set_mode((winWidth, winHeight))
pygame.display.set_caption('Snake-The Best')
font=pygame.font.Font('freesansbold.ttf',18)
showStartScreen()

while True:
    runGame()
    if score>record:
        f=open('record.txt','w')
        f.write(str(score))
        f.close()