use bevy_replicon::prelude::{FromClient, SendTargets, ToClients};
use crate::prelude::*;
use crate::shared::ecs::clock_sync::{ClientTiming, ServerTiming};

pub fn client_timing_plugin(app: &mut App) {
    app.add_systems(Update, echo_timing);
}

fn echo_timing(
    mut client_timings: MessageReader<FromClient<ClientTiming>>,
    mut server_timings: MessageWriter<ToClients<ServerTiming>>,
    time: Res<Time>,
) {
    for client_timing in client_timings.read() {
        let Ok(now) = web_time::SystemTime::now().duration_since(web_time::UNIX_EPOCH) else {
            warn!("Could not get system time");
            return
        };
        server_timings.write(ToClients {
            targets: SendTargets::Single(client_timing.client_id),
            message: ServerTiming {
                client_tx: client_timing.time,
                server: now.as_secs_f64(),
                server_time_elapsed: time.elapsed_secs_f64(),
            }
        });
    }
}