DATA_STRUCTURES.mmd

classDiagram
    class Board {
        <<struct>>
        +b256 piecemap
        +BitBoard bitboard
        +u64 metadata
    }
    class BitBoard {
        <<struct>>
        +u64 black_pawns
        +u64 black_bishops
        +u64 black_rooks
        +u64 black_knights
        +u64 black_queen
        +u64 black_king
        +u64 white_pawns
        +u64 white_bishops
        +u64 white_rooks
        +u64 white_knights
        +u64 white_queen
        +u64 white_king
        +u64 pawns
        +u64 bishops
        +u64 rooks
        +u64 knights
        +u64 queens
        +u64 kings
        +u64 black
        +u64 white
        +u64 all
    }
    class Game {
        <<struct>>
        +Player player1
        +Player player2
        +u64 game_counter
        +Board board
        +Status Status
        +b256 statehash
    }
    class Move {
        <<struct>>
        +ContractId target
        +u64 nonce
        +b256 game_id
        +b256 piecemap
        +u64 metadata
        +Square source
        +Square source
        +Option<Piece> promotion
        +u64 seq
    }
    class Piece {
        <<enum>>
        +variant Pawn
        +variant Bishop
        +variant Rook
        +variant Knight
        +variant Queen
        +variant King
    }
    class Square {
        <<enum>>
        +variant a1
        +variant b1
        +variant c1
        +variant ...
        +variant h7
        +variant h8
    }
    class Status {
        <<enum>>
        +variant Active
        +variant Checkmate
        +variant Stalemate
    }
    class CastlingRights {
        <<enum>>
        +variant NoRights
        +variant KingSide
        +variant QueenSide
        +variant Both
    }

    class Player {
        <<abstract>>
        +Address address
        +u64 color
        +CastlingRights rights
    }

    class game_id {
        <<hash>>
        +b256 hash(player1,player2,game_number)
    }
    class piecemap {
        <<bitmap>>
        +b256 binary_encoded_pieces_by_square
    }
    class metadata {
        <<bitmap>>
        +b256 bits(side_to_move, en_passant, half_move, castling_rights, full_move)
    }
    class statehash {
        <<hash>>
        +b256 hash(piecemap,metadata)
    }

    CastlingRights <.. Player
    Piece <.. Move: depends
    Square <.. Move: depends
    Board <.. Game: depends
    BitBoard <.. Board: depends
    Status <.. Game: depends
    Player <.. Game: depends
    game_id <.. Move: depends
    piecemap <.. Move: depends
    metadata <.. Move: depends
    piecemap <.. statehash: depends
    metadata <.. statehash: depends