// Copyright 2019. The Tari Project
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use blake2::Blake2b;
use criterion::{criterion_group, criterion_main, BatchSize, Criterion};
use digest::{consts::U32, Digest};
use tari_crypto::{hash_domain, hashing::DomainSeparatedHasher};
use tari_mmr::{Hash, MerkleMountainRange};

hash_domain!(MmrBenchTestHashDomain, "com.tari.base_layer.mmr.benches", 1);
pub type MmrTestHasherBlake256 = DomainSeparatedHasher<Blake2b<U32>, MmrBenchTestHashDomain>;
pub type TestMmr = MerkleMountainRange<MmrTestHasherBlake256, Vec<Hash>>;

fn get_hashes(n: usize) -> Vec<Vec<u8>> {
    (0..n)
        .map(|i| Blake2b::<U32>::digest(i.to_le_bytes()).to_vec())
        .collect()
}

fn build_mmr(c: &mut Criterion) {
    let sizes = [100, 1_000, 10_000, 100_000];
    for size in sizes {
        c.bench_function(&format!("MMR: {size} hashes"), move |b| {
            let hashes = get_hashes(size);
            b.iter_batched(
                || {
                    // Set up a fresh tree for this iteration
                    (TestMmr::new(Vec::default()), hashes.clone())
                },
                |(mut mmr, hashes)| {
                    hashes.into_iter().for_each(|hash| {
                        mmr.push(hash).unwrap();
                    });
                },
                BatchSize::SmallInput,
            );
        });
    }
}

criterion_group!(mmr, build_mmr);
criterion_main!(mmr);