// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// OpenEthereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with OpenEthereum.  If not, see <http://www.gnu.org/licenses/>.

#[macro_use]
extern crate criterion;
extern crate ethash;

use criterion::Criterion;
use ethash::{NodeCacheBuilder, OptimizeFor};

const HASH: [u8; 32] = [
    0xf5, 0x7e, 0x6f, 0x3a, 0xcf, 0xc0, 0xdd, 0x4b, 0x5b, 0xf2, 0xbe, 0xe4, 0x0a, 0xb3, 0x35, 0x8a,
    0xa6, 0x87, 0x73, 0xa8, 0xd0, 0x9f, 0x5e, 0x59, 0x5e, 0xab, 0x55, 0x94, 0x05, 0x52, 0x7d, 0x72,
];
const NONCE: u64 = 0xd7b3ac70a301a249;

criterion_group!(
    basic,
    bench_light_compute_memmap,
    bench_light_compute_memory,
    bench_light_new_round_trip_memmap,
    bench_light_new_round_trip_memory,
    bench_light_from_file_round_trip_memory,
    bench_light_from_file_round_trip_memmap
);
criterion_main!(basic);

fn bench_light_compute_memmap(b: &mut Criterion) {
    use std::env;

    let builder = NodeCacheBuilder::new(OptimizeFor::Memory, u64::max_value());
    let light = builder.light(&env::temp_dir(), 486382);

    b.bench_function("bench_light_compute_memmap", move |b| {
        b.iter(|| light.compute(&HASH, NONCE, u64::max_value()))
    });
}

fn bench_light_compute_memory(b: &mut Criterion) {
    use std::env;

    let builder = NodeCacheBuilder::new(OptimizeFor::Cpu, u64::max_value());
    let light = builder.light(&env::temp_dir(), 486382);

    b.bench_function("bench_light_compute_memmap", move |b| {
        b.iter(|| light.compute(&HASH, NONCE, u64::max_value()))
    });
}

fn bench_light_new_round_trip_memmap(b: &mut Criterion) {
    use std::env;

    b.bench_function("bench_light_compute_memmap", move |b| {
        b.iter(|| {
            let builder = NodeCacheBuilder::new(OptimizeFor::Memory, u64::max_value());
            let light = builder.light(&env::temp_dir(), 486382);
            light.compute(&HASH, NONCE, u64::max_value());
        })
    });
}

fn bench_light_new_round_trip_memory(b: &mut Criterion) {
    use std::env;

    b.bench_function("bench_light_compute_memmap", move |b| {
        b.iter(|| {
            let builder = NodeCacheBuilder::new(OptimizeFor::Cpu, u64::max_value());
            let light = builder.light(&env::temp_dir(), 486382);
            light.compute(&HASH, NONCE, u64::max_value());
        })
    });
}

fn bench_light_from_file_round_trip_memory(b: &mut Criterion) {
    use std::env;

    let dir = env::temp_dir();
    let height = 486382;
    {
        let builder = NodeCacheBuilder::new(OptimizeFor::Cpu, u64::max_value());
        let mut dummy = builder.light(&dir, height);
        dummy.to_file().unwrap();
    }

    b.bench_function("bench_light_compute_memmap", move |b| {
        b.iter(|| {
            let builder = NodeCacheBuilder::new(OptimizeFor::Cpu, u64::max_value());
            let light = builder.light_from_file(&dir, 486382).unwrap();
            light.compute(&HASH, NONCE, u64::max_value());
        })
    });
}

fn bench_light_from_file_round_trip_memmap(b: &mut Criterion) {
    use std::env;

    let dir = env::temp_dir();
    let height = 486382;

    {
        let builder = NodeCacheBuilder::new(OptimizeFor::Memory, u64::max_value());
        let mut dummy = builder.light(&dir, height);
        dummy.to_file().unwrap();
    }

    b.bench_function("bench_light_compute_memmap", move |b| {
        b.iter(|| {
            let builder = NodeCacheBuilder::new(OptimizeFor::Memory, u64::max_value());
            let light = builder.light_from_file(&dir, 486382).unwrap();
            light.compute(&HASH, NONCE, u64::max_value());
        })
    });
}
