// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

use bench::{
    harness::ConnectedBuffer, CipherSuite, CryptoConfig, HandshakeType, KXGroup, OpenSslConnection,
    RustlsConnection, S2NConnection, SigType, TlsConnPair, TlsConnection,
};
use criterion::{
    criterion_group, criterion_main, measurement::WallTime, BatchSize, BenchmarkGroup, Criterion,
    Throughput,
};
use strum::IntoEnumIterator;

fn bench_throughput_for_library<T: TlsConnection>(
    bench_group: &mut BenchmarkGroup<WallTime>,
    shared_buf: &mut [u8],
    cipher_suite: CipherSuite,
) {
    bench_group.bench_function(T::name(), |b| {
        b.iter_batched_ref(
            || {
                TlsConnPair::<T, T>::new(
                    CryptoConfig::new(cipher_suite, KXGroup::default(), SigType::default()),
                    HandshakeType::default(),
                    ConnectedBuffer::default(),
                )
                .map(|mut h| {
                    let _ = h.handshake();
                    h
                })
            },
            |conn_pair_res| {
                if let Ok(conn_pair) = conn_pair_res {
                    let _ = conn_pair.round_trip_transfer(shared_buf);
                }
            },
            BatchSize::SmallInput,
        )
    });
}

pub fn bench_throughput_cipher_suite(c: &mut Criterion) {
    // arbitrarily large to cut across TLS record boundaries
    let mut shared_buf = [0u8; 100000];

    for cipher_suite in CipherSuite::iter() {
        let mut bench_group = c.benchmark_group(format!("throughput-{:?}", cipher_suite));
        bench_group.throughput(Throughput::Bytes(shared_buf.len() as u64));
        bench_throughput_for_library::<S2NConnection>(
            &mut bench_group,
            &mut shared_buf,
            cipher_suite,
        );
        #[cfg(not(feature = "historical-perf"))]
        {
            bench_throughput_for_library::<RustlsConnection>(
                &mut bench_group,
                &mut shared_buf,
                cipher_suite,
            );
            bench_throughput_for_library::<OpenSslConnection>(
                &mut bench_group,
                &mut shared_buf,
                cipher_suite,
            );
        }
    }
}

criterion_group!(benches, bench_throughput_cipher_suite);
criterion_main!(benches);