use std::process::Stdio;
use std::time::Duration;

use tokio::process::Command;
use tracing::{error, info, warn};

/// Supervises the go2rtc subprocess used for camera restreaming (RTSP/USB -> WebRTC).
/// Restarts it with a fixed backoff whenever it exits, for as long as the daemon runs.
pub async fn watchdog(bin: String, config_path: String) {
    loop {
        info!(%bin, %config_path, "starting go2rtc");

        let spawned = Command::new(&bin)
            .arg("-config")
            .arg(&config_path)
            .stdout(Stdio::null())
            .stderr(Stdio::inherit())
            .kill_on_drop(true)
            .spawn();

        match spawned {
            Ok(mut child) => match child.wait().await {
                Ok(status) => warn!(%status, "go2rtc exited, restarting after backoff"),
                Err(err) => error!(?err, "failed to wait on go2rtc process"),
            },
            Err(err) => {
                error!(?err, "failed to spawn go2rtc, is it installed and on PATH?");
            }
        }

        tokio::time::sleep(Duration::from_secs(5)).await;
    }
}