Material.hpp

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/*
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 *
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#pragma once
 
#include <cstdint>
#include <libbenbot/eval/Score.hpp>
#include <libchess/board/Pieces.hpp>
#include <libchess/game/Position.hpp>
#include <libchess/pieces/PieceTypes.hpp>
 
namespace ben_bot::eval {
 
using chess::game::Position;
using PieceType = chess::pieces::Type;

namespace piece_values {


    inline constexpr Value PAWN { UINT16_C(100) };

    inline constexpr Value KNIGHT { UINT16_C(320) };

    inline constexpr Value BISHOP { UINT16_C(330) };

    inline constexpr Value ROOK { UINT16_C(500) };

    inline constexpr Value QUEEN { UINT16_C(900) };

    inline constexpr Value KING { UINT16_C(10000) };


    [[nodiscard, gnu::const]] constexpr auto get(PieceType type) noexcept -> Value;
 
} // namespace piece_values

[[nodiscard, gnu::const]] constexpr auto score_material(const Position& position) noexcept -> Value;
 
/*
                         ___                           ,--,
      ,---,            ,--.'|_                ,--,   ,--.'|
    ,---.'|            |  | :,'             ,--.'|   |  | :
    |   | :            :  : ' :             |  |,    :  : '    .--.--.
    |   | |   ,---.  .;__,'  /    ,--.--.   `--'_    |  ' |   /  /    '
  ,--.__| |  /     \ |  |   |    /       \  ,' ,'|   '  | |  |  :  /`./
 /   ,'   | /    /  |:__,'| :   .--.  .-. | '  | |   |  | :  |  :  ;_
.   '  /  |.    ' / |  '  : |__  \__\/: . . |  | :   '  : |__ \  \    `.
'   ; |:  |'   ;   /|  |  | '.'| ," .--.; | '  : |__ |  | '.'| `----.   \
|   | '/  ''   |  / |  ;  :    ;/  /  ,.  | |  | '.'|;  :    ;/  /`--'  /__  ___  ___
|   :    :||   :    |  |  ,   /;  :   .'   \;  :    ;|  ,   /'--'.     /  .\/  .\/  .\
 \   \  /   \   \  /    ---`-' |  ,     .-./|  ,   /  ---`-'   `--'---'\  ; \  ; \  ; |
  `----'     `----'             `--`---'     ---`-'                     `--" `--" `--"
 
 */
 
namespace piece_values {
 
    constexpr auto get(const PieceType type) noexcept -> Value
    {
        switch (type) {
            case PieceType::Pawn  : return PAWN;
            case PieceType::Knight: return KNIGHT;
            case PieceType::Bishop: return BISHOP;
            case PieceType::Rook  : return ROOK;
            case PieceType::Queen : return QUEEN;
            default               : [[fallthrough]];
            case PieceType::King  : return KING;
        }
    }
 
} // namespace piece_values
 
namespace detail {
 
    template <bool IncludePawns = true>
    [[nodiscard, gnu::const]] constexpr auto count_material(
        const chess::board::Pieces& pieces) noexcept
        -> Value
    {
        auto total = (static_cast<Value>(pieces.knights.count()) * piece_values::KNIGHT)
                   + (static_cast<Value>(pieces.bishops.count()) * piece_values::BISHOP)
                   + (static_cast<Value>(pieces.rooks.count()) * piece_values::ROOK)
                   + (static_cast<Value>(pieces.queens.count()) * piece_values::QUEEN);
 
        if constexpr (IncludePawns) {
            total += (static_cast<Value>(pieces.pawns.count()) * piece_values::PAWN);
        }
 
        return static_cast<Value>(total);
    }
 
} // namespace detail
 
constexpr auto score_material(const Position& position) noexcept -> Value
{
    return detail::count_material(position.our_pieces())
         - detail::count_material(position.their_pieces());
}
 
} // namespace ben_bot::eval