import pygame
from random import randint as ri
def scale(vaktor):
    scaledx = dvdsize[0]*vaktor
    scaledy = dvdsize[1]*vaktor
    return (scaledx,scaledy)
pygame.init()
default_font = pygame.font.SysFont("sans", 14)

is_fullscreen = False
fill_screen = True
show_debug = False
screen = pygame.display.set_mode((0,0),pygame.FULLSCREEN)
pygame.display.set_caption("Screensaver")
screensize = pygame.display.get_window_size()

clock = pygame.time.Clock()

dvd = pygame.image.load("dvd-logo.png")
dvdsize = dvd.get_size()

dvdscale = 1
dvdscalesize = scale(dvdscale)
dvdscaled = pygame.transform.scale(dvd,dvdscalesize)
dvdpos = ri(0,screensize[0]-dvdsize[0]),ri(0,screensize[1]-dvdsize[1])
dvdspeed = 3

richtung = ["r","u"]
def randcolor():
    return (ri(0,255),ri(0,255),ri(0,255))

def moving(richtung,dvdpos):
    dvdx,dvdy = dvdpos
    if richtung[0] == "r":
        dvdx += dvdspeed
    else:
        dvdx -= dvdspeed
    if richtung[1] =="u":
        dvdy += dvdspeed
    else:
        dvdy -= dvdspeed
    return dvdx,dvdy

def toggle_fullscreen(is_fullscreen):
    if is_fullscreen:
        pygame.display.set_mode((600,500),pygame.RESIZABLE)
    else:
        pygame.display.set_mode((0,0),pygame.FULLSCREEN)
    is_fullscreen = not is_fullscreen
    return is_fullscreen,pygame.display.get_window_size()

def get_debug_text():
    debug_text = ""
    for index,a in enumerate(globals()):
        debug_text = default_font.render(f"{str(a)} = {globals()[a]}", True, (240, 240, 240))
        screen.blit(debug_text,(0,index*default_font.get_height()))

running = True
if __name__ == "__main__":
    color = randcolor()
    while running:
        if fill_screen:
            screen.fill((0,0,0))
        pressed_keys = pygame.key.get_pressed()

        if pressed_keys[pygame.K_ESCAPE]:
            exit()
        if pressed_keys[pygame.K_SPACE] and not preview_pressed_keys[pygame.K_SPACE]:
           fill_screen = not fill_screen
        if pressed_keys[pygame.K_d] and not preview_pressed_keys[pygame.K_d]:
           show_debug = not show_debug
        if pressed_keys[pygame.K_f] and screen.get_size():
            is_fullscreen,screensize = toggle_fullscreen(is_fullscreen)
        if pressed_keys[pygame.K_UP] and dvdspeed>=0:
            dvdspeed += 1
        if pressed_keys[pygame.K_DOWN] and dvdspeed>=1:
            dvdspeed -= 1
        if pressed_keys[pygame.K_RIGHT] and dvdscale>0.1:
            dvdscale += 0.1
            dvdscalesize = scale(dvdscale)
        if pressed_keys[pygame.K_LEFT] and dvdscale>=0.2:
            dvdscale -= 0.1
            dvdscalesize = scale(dvdscale)

        preview_pressed_keys = pressed_keys

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                exit()
            if event.type == pygame.WINDOWRESIZED:
                screensize = pygame.display.get_window_size()
        
        if dvdpos[0]+dvdscalesize[0] >= screensize[0]:
            richtung[0] = "l"
            color = randcolor()
        if dvdpos[0] <= 0:
            richtung[0] = "r"
            color = randcolor()
        if dvdpos[1]+dvdscalesize[1] >= screensize[1]:
            richtung[1] = "o"
            color = randcolor()
        if dvdpos[1] <= 0:
            richtung[1] = "u"
            color = randcolor()
        
        dvdpos = moving(richtung,dvdpos)
        pygame.draw.rect(screen,color,(dvdpos[0],dvdpos[1],dvdscalesize[0],dvdscalesize[1]))
        dvdscaled = pygame.transform.scale(dvd,dvdscalesize)
        screen.blit(dvdscaled,dvdpos)
        if show_debug:
            get_debug_text()
        pygame.display.flip()
        clock.tick(60)