use anyhow::{bail, Result};

use crate::{board::game::Game, evaluation::evaluation::evaluate_position};

use super::{
    move_ordering,
    time::{hard_limit, TimeInfo},
};

pub fn quiescence(game: &mut Game, mut alpha: i32, beta: i32, time_info: &TimeInfo) -> Result<i32> {
    if hard_limit(&time_info.time, time_info.remaining_time_in_ms) {
        bail!("Time is up! In Quiescence");
    }

    let stand_pat = evaluate_position(&game.board);

    if stand_pat >= beta {
        return Ok(beta);
    }

    if stand_pat > alpha {
        alpha = stand_pat;
    }

    let color = game.current_player();
    let all_moves = game.board.pseudo_moves_all_captures();
    let moves = move_ordering::sort_moves(all_moves, &game.mailbox, None);

    for mv in moves {
        game.make_move(&mv);

        if game.board.king_under_check(color) {
            game.unmake_move();
            continue;
        }
        
        let score = -quiescence(game, -beta, -alpha, time_info)?;
        game.unmake_move();

        if score >= beta {
            return Ok(beta);
        }

        if score > alpha {
            alpha = score
        }
    }

    Ok(alpha)
}