from moviepy.editor import VideoFileClip


def vertical_crop(video_path):

    clip = VideoFileClip(video_path)

    w, h = clip.size
    target_ratio = 9 / 16

    new_width = int(h * target_ratio)

    x_center = w / 2

    cropped = clip.crop(
        x_center=x_center,
        width=new_width,
        height=h
    )

    output = video_path.replace(".mp4", "_vertical.mp4")

    cropped.write_videofile(output, codec="libx264")

    return output