use criterion::{black_box, criterion_group, criterion_main, Criterion};
use hotsauce::Regex;

fn check(pat: &str, hay: &str) {
    let regex = Regex::new(pat).unwrap();
    for mat in regex.matches(black_box(hay).bytes()) {
        black_box(mat);
    }
}

fn benchmark(c: &mut Criterion) {
    let mut g = c.benchmark_group("find text");
    g.sample_size(500);

    g.bench_function("pat at start", |b| b.iter(|| check("hey", "hey")));

    let late = format!("{}hey", " ".repeat(100_000));
    g.bench_function("pat after 100_000", |b| b.iter(|| check("hey", &late)));

    let overlap = format!("{}hey", "h".repeat(100_000));
    g.bench_function("pat after 100_000 start of pat", |b| {
        b.iter(|| check("hey", &overlap))
    });
    g.bench_function("find longest pat from start", |b| {
        b.iter(|| check("h+ey", &overlap))
    });

    g.finish();
}

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