// client/src/output/video.rs

use gstreamer as gst;
use gstreamer_app as gst_app;
use gst::prelude::*;
use navka_common::navka::VideoPacket;
use winit::{
    event_loop::EventLoop,
    window::{Window, WindowBuilder},
};

pub struct MonitorWindow {
    id: u32,
    _window: Window,
    src: gst_app::AppSrc,
}

impl MonitorWindow {
    pub fn new(id: u32, el: &EventLoop<()>) -> anyhow::Result<Self> {
        gst::init()?;

        let window = WindowBuilder::new()
            .with_title(format!("Lesavka‑monitor‑{id}"))
            .with_decorations(false)
            .build(el)?;

        // appsrc -> decode -> convert -> waylandsink
        let pipeline = gst::parse_launch(
            "appsrc name=src is-live=true format=time do-timestamp=true ! \
             queue ! h264parse ! avdec_h264 ! videoconvert ! \
             waylandsink name=sink sync=false",
        )?
        .downcast::<gst::Pipeline>()?;

        let src = pipeline.by_name("src").unwrap().downcast::<gst_app::AppSrc>()?;
        src.set_latency(gst::ClockTime::NONE);
        src.set_property_format(gst::Format::Time);

        pipeline.set_state(gst::State::Playing)?;
        Ok(Self { id, _window: window, src })
    }

    pub fn push_packet(&self, pkt: VideoPacket) {
        if let Ok(mut buf) = gst::Buffer::from_mut_slice(pkt.data) {
            buf.set_pts(gst::ClockTime::from_microseconds(pkt.pts));
            let _ = self.src.push_buffer(buf);
        }
    }
}