use gstreamer::{
    self as gst,
    prelude::{Cast, GstBinExtManual},
    ElementFactory,
};
use gstreamer_app as gst_app;

pub struct Pipeline {
    pub pipeline: gst::Pipeline,

    pub sink: gst_app::AppSink,
}

pub fn new_pipeline() -> Pipeline {
    let pipeline = gst::Pipeline::builder()
        .name("camera_to_rtp_pipeine")
        .build();

    let source = ElementFactory::make("v4l2src").build().unwrap();

    let video_convert = ElementFactory::make("videoconvert").build().unwrap();

    let vp8enc = ElementFactory::make("vp8enc").build().unwrap();

    let rtp = ElementFactory::make("rtpvp8pay").build().unwrap();

    let app_sink = gst_app::AppSink::builder().build();

    pipeline
        .add_many([
            &source,
            &video_convert,
            &vp8enc,
            &rtp,
            app_sink.upcast_ref(),
        ])
        .expect("Could not add all the stuff to the pipeline");

    gst::Element::link_many(&[&source, &video_convert, &vp8enc, &rtp]).unwrap();

    Pipeline {
        pipeline,
        sink: app_sink,
    }
}