_is_init = 0



def init():
    global list_cameras, Camera, colorspace, _is_init


    import os,sys

    use_opencv = False
    use_vidcapture = False
    use__camera = True


    if sys.platform == 'win32':
        use_vidcapture = True

    elif "linux" in sys.platform:
        use__camera = True

    else:
        use_opencv = True



    # see if we have any user specified defaults in environments.
    camera_env = os.environ.get("PYGAME_CAMERA", "")
    if camera_env == "opencv":
        use_opencv = True
    if camera_env == "vidcapture":
        use_vidcapture = True



    # select the camera module to import here.

    # the _camera module has some code which can be reused by other modules.
    #  it will also be the default one.
    import _camera
    colorspace = _camera.colorspace

    if use__camera:
        list_cameras = _camera.list_cameras
        Camera = _camera.Camera

    if use_opencv:
        try:
            import _camera_opencv_highgui
        except:
            _camera_opencv_highgui = None

        if _camera_opencv_highgui:
            _camera_opencv_highgui.init()

            list_cameras = _camera_opencv_highgui.list_cameras
            Camera = _camera_opencv_highgui.Camera

    if use_vidcapture:
        try:
            import _camera_vidcapture
        except:
            _camera_vidcapture = None

        if _camera_vidcapture:
            _camera_vidcapture.init()
            list_cameras = _camera_vidcapture.list_cameras
            Camera = _camera_vidcapture.Camera



    _is_init = 1
    pass


def quit():
    global _is_init
    _is_init = 0
    pass
 

def _check_init():
    global _is_init
    if not _is_init:
        raise ValueError("Need to call camera.init() before using.")

def list_cameras():
    """
    """
    _check_init()
    raise NotImplementedError()


class Camera:

    def __init__(self, device =0, size = (320, 200), mode = "RGB"):
        """
        """
        _check_init()
        raise NotImplementedError()

    def set_resolution(self, width, height):
        """Sets the capture resolution. (without dialog)
        """
        pass

    def start(self):
        """
        """

    def stop(self):
        """
        """

    def get_buffer(self):
        """
        """

    def set_controls(self, **kwargs):
        """
        """

    def get_image(self, dest_surf = None):
        """
        """

    def get_surface(self, dest_surf = None):
        """
        """



if __name__ == "__main__":

    # try and use this camera stuff with the pygame camera example.
    import pygame.examples.camera

    #pygame.camera.Camera = Camera
    #pygame.camera.list_cameras = list_cameras
    pygame.examples.camera.main()