use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
use othello::{
    logic::{FutureMoveConfig, FutureMoves},
    repr::{Board, Piece},
};

fn extend_layers_no_pruning(depth: usize) -> usize {
    let config = FutureMoveConfig {
        max_depth: depth,
        min_arena_depth: 0,
        top_k_children: 5,
        up_to_minus: 4,
        max_arena_size: usize::MAX,
        do_prune: false,
        print: false,
        children_eval_method: Default::default(),
    };
    let mut fut = FutureMoves::new(Piece::Black, config);
    fut.update_from_board(&Board::STARTING_POSITION);
    fut.extend_layers();
    fut.arena_len()
}

fn criterion_benchmark(c: &mut Criterion) {
    let mut group = c.benchmark_group("extend_layer (no pruning)");

    for depth in 6..8 {
        group.throughput(Throughput::Elements(extend_layers_no_pruning(depth) as u64));
        group.bench_with_input(BenchmarkId::from_parameter(depth), &depth, |b, depth| {
            b.iter(|| extend_layers_no_pruning(*depth));
        });
    }
    group.finish();
}

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