pygame_space -> def wave

def wave():
    global waveCount, waveDone, lastSpawn, numSpawned, lastWave, randomGroupY, gamestate
    t = pygame.time.get_ticks()
    #print 'en: ' + str(len(enemies)) + ', wave: ' + str(waveCount) #str(t - lastSpawn)
    if waveCount < 20:
        if waveCount %2 == 1:
            if not waveDone:
                if (t - lastSpawn) > 200:
                    a = Enemy.enemy('grunt-siner-wave', 3, bullets, enemies, randomGroupY)
                    lastSpawn = pygame.time.get_ticks()
                if len(enemies)%5 == 0 and waveCount > 9:
                    f = Enemy.enemy('siner', 2, bullets, enemies)
                if len(enemies) > 12:
                    waveDone = True
            if (t - lastSpawn) > 5000 and waveDone:
                waveCount += 1
                lastwave = pygame.time.get_ticks()
                waveDone = False
                randomGroupY = random.randint(50, 300)
        else:
            numEn = int(math.ceil(waveCount/3)) + 1
            if not waveDone:
                for x in range(0, numEn):
                    e = Enemy.enemy('grunt', 3, bullets, enemies)
                    if x > 1:
                        f = Enemy.enemy('siner', 2, bullets, enemies)
                    if x > 3:
                        g = Enemy.enemy('fighter', random.randint(4, 5), bullets, enemies)
                    waveDone = True
            if len(enemies) == 0 and waveDone:
                waveCount += 1
                waveDone = False
    else:
        if not waveDone:
            b = Enemy.enemy('boss', 0.5, bullets, enemies)
            waveDone = True
        if len(enemies) == 0 and waveDone:
            gamestate = 'game over'
            #print 'game should be over now'