use criterion::{criterion_group, criterion_main, Criterion};

use std::thread::spawn;

use crossbeam_channel::{bounded, Receiver};

type S0 = Receiver<Receiver<Receiver<Receiver<Receiver<()>>>>>;
type S1 = Receiver<Receiver<Receiver<Receiver<()>>>>;
type S2 = Receiver<Receiver<Receiver<()>>>;
type S3 = Receiver<Receiver<()>>;
type S4 = Receiver<()>;
type S5 = ();

fn aux() {
    let main = spawn(move || {
        for _ in 0..LOOPS {
            let (sender_s_0, receiver_s_0) = bounded::<S0>(1);
            let (sender_s_1, receiver_s_1) = bounded::<S1>(1);
            let (sender_s_2, receiver_s_2) = bounded::<S2>(1);
            let (sender_s_3, receiver_s_3) = bounded::<S3>(1);
            let (sender_s_4, receiver_s_4) = bounded::<S4>(1);
            let (sender_s_5, receiver_s_5) = bounded::<S5>(1);

            sender_s_0.send(receiver_s_1).unwrap();
            let receiver_s_1_bis = receiver_s_0.recv().unwrap();

            sender_s_1.send(receiver_s_2).unwrap();
            let receiver_s_2_bis = receiver_s_1_bis.recv().unwrap();

            sender_s_2.send(receiver_s_3).unwrap();
            let receiver_s_3_bis = receiver_s_2_bis.recv().unwrap();

            sender_s_3.send(receiver_s_4).unwrap();
            let receiver_s_4_bis = receiver_s_3_bis.recv().unwrap();

            sender_s_4.send(receiver_s_5).unwrap();
            let receiver_s_5_bis = receiver_s_4_bis.recv().unwrap();

            sender_s_5.send(()).unwrap();
            receiver_s_5_bis.recv().unwrap();
        }
    });

    main.join().unwrap();
}

/////////////////////////

static LOOPS: i64 = 100;

pub fn travel_agency_crossbeam(c: &mut Criterion) {
    c.bench_function("Travel agency crossbeam", |b| b.iter(aux));
}

/////////////////////////

criterion_group! {
    name = bench;
    config = Criterion::default().significance_level(0.05).without_plots().sample_size(100000);
    targets = travel_agency_crossbeam,
}

criterion_main! {
    bench
}