//! Probe: what do jouleclaw-energy's meters report on this box? The host meter
//! (`detect_meter`, for work wherever it runs) and the in-process meter
//! (`detect_in_process_meter`, for work on this process's own threads — this
//! probe's own CPU burn is such work).
use jouleclaw_energy::meter::{detect_in_process_meter, detect_meter, CompositeMeter};

fn probe(label: &str, m: &CompositeMeter) {
    println!("{label}: active meter: {} (holds {:?})", m.active_name(), m.names());
    println!("{label}: available: {}", m.is_available());
    let r0 = m.read().expect("read0");
    println!("{label}: provenance: {:?}, domain: {:?}", r0.provenance, r0.domain);
    // Burn some CPU on this thread so a counter shows a delta.
    let t = std::time::Instant::now();
    let mut x = 0u64;
    for i in 0..3_000_000_000u64 {
        x = x.wrapping_add(i ^ (x >> 1));
    }
    let r1 = m.read().expect("read1");
    let secs = t.elapsed().as_secs_f64();
    let dj = r1.uj.saturating_sub(r0.uj) as f64 / 1e6;
    println!("{label}: spin sentinel: {x}");
    println!(
        "{label}: over {:.2}s: delta {:.3} J  (~{:.1} W avg)",
        secs,
        dj,
        if secs > 0.0 { dj / secs } else { 0.0 }
    );
}

fn main() {
    probe("host", &detect_meter());
    probe("in-process", &detect_in_process_meter());
}