use crate::{
    board::{game::Game, history::MoveParameters},
    evaluation::evaluation::evaluate_position,
    movegen::r#move::{Move, MoveType},
};

pub fn quiescence(game: &mut Game, mut alpha: i32, beta: i32) -> (Option<Move>, i32) {
    let color = game.current_player();
    let stand_pat = evaluate_position(&game.board);

    if stand_pat >= beta {
        return (None, beta);
    }

    if alpha < stand_pat {
        alpha = stand_pat;
    }

    let captures = game
        .board
        .pseudo_moves_all()
        .into_iter()
        .filter(|m| !matches!(m.move_type, MoveType::Quiet));

    for mv in captures {
        let move_parameters = MoveParameters::build(&game.board, &mv);
        game.board.make_move(&mv);

        if game.board.king_under_check(color) {
            game.board.unmake_move(move_parameters);
            continue;
        }

        let move_score = -quiescence(game, -beta, -alpha).1;
        game.board.unmake_move(move_parameters);

        if move_score >= beta {
            return (Some(mv), beta);
        }

        alpha = alpha.max(move_score);
    }

    (None, 0)
}