from PIL import Image


class Overlay(object):
    def __init__(self):
        self.alpha = 0


class PiCamera(object):
    def __init__(self):
        self.resolution = None

    def start_preview(self, *args, **kwargs):
        pass

    def add_overlay(self, *args, **kwargs):
        return Overlay()

    def remove_overlay(self, *args, **kwargs):
        pass

    def capture(self, filename, format, *args, **kwargs):
        print("FAKE: capture(%s, %s)" % (filename, format))
        img = Image.new("RGB", self.resolution, (255, 255, 255))
        img.save(filename, format)

    def close(self, *args, **kwargs):
        pass