-module(game_server).
-compile([no_auto_import, nowarn_unused_vars]).

-export([print_board/1, apply_move/2, apply_move_uci/2, undo_move/1, all_legal_moves/1, get_fen/1, from_fen/1, new_game/0]).
-export_type([message/0]).

-type message() :: {all_legal_moves,
        gleam@erlang@process:subject(list(move:move()))} |
    {apply_move, gleam@erlang@process:subject(game:game()), move:move()} |
    {apply_move_uci, gleam@erlang@process:subject(game:game()), binary()} |
    {undo_move, gleam@erlang@process:subject(game:game())} |
    {get_fen, gleam@erlang@process:subject(binary())} |
    shutdown |
    {print_board, gleam@erlang@process:subject(nil)}.

-spec print_board(gleam@erlang@process:subject(message())) -> nil.
print_board(Game_actor) ->
    gleam@erlang@process:call(
        Game_actor,
        fun(Field@0) -> {print_board, Field@0} end,
        1000
    ).

-spec apply_move(gleam@erlang@process:subject(message()), move:move()) -> game:game().
apply_move(Game_actor, Move) ->
    gleam@erlang@process:call(
        Game_actor,
        fun(_capture) -> {apply_move, _capture, Move} end,
        1000
    ).

-spec apply_move_uci(gleam@erlang@process:subject(message()), binary()) -> game:game().
apply_move_uci(Game_actor, Move_uci) ->
    gleam@erlang@process:call(
        Game_actor,
        fun(_capture) -> {apply_move_uci, _capture, Move_uci} end,
        1000
    ).

-spec undo_move(gleam@erlang@process:subject(message())) -> game:game().
undo_move(Game_actor) ->
    gleam@erlang@process:call(
        Game_actor,
        fun(Field@0) -> {undo_move, Field@0} end,
        1000
    ).

-spec all_legal_moves(gleam@erlang@process:subject(message())) -> list(move:move()).
all_legal_moves(Game_actor) ->
    gleam@erlang@process:call(
        Game_actor,
        fun(Field@0) -> {all_legal_moves, Field@0} end,
        1000
    ).

-spec get_fen(gleam@erlang@process:subject(message())) -> binary().
get_fen(Game_actor) ->
    gleam@erlang@process:call(
        Game_actor,
        fun(Field@0) -> {get_fen, Field@0} end,
        1000
    ).

-spec handle_all_legal_moves(
    game:game(),
    gleam@erlang@process:subject(list(move:move()))
) -> gleam@otp@actor:next(message(), game:game()).
handle_all_legal_moves(Game, Client) ->
    gleam@erlang@process:send(Client, game:all_legal_moves(Game)),
    gleam@otp@actor:continue(Game).

-spec handle_undo_move(game:game(), gleam@erlang@process:subject(game:game())) -> gleam@otp@actor:next(any(), game:game()).
handle_undo_move(Game, Client) ->
    New_game_state = game:undo_move(Game),
    gleam@erlang@process:send(Client, New_game_state),
    gleam@otp@actor:continue(New_game_state).

-spec handle_apply_move_uci(
    game:game(),
    gleam@erlang@process:subject(game:game()),
    binary()
) -> gleam@otp@actor:next(any(), game:game()).
handle_apply_move_uci(Game, Client, Move) ->
    New_game_state = game:apply_move_uci(Game, Move),
    gleam@erlang@process:send(Client, New_game_state),
    gleam@otp@actor:continue(New_game_state).

-spec handle_apply_move(
    game:game(),
    gleam@erlang@process:subject(game:game()),
    move:move()
) -> gleam@otp@actor:next(any(), game:game()).
handle_apply_move(Game, Client, Move) ->
    New_game_state = game:apply_move(Game, Move),
    gleam@erlang@process:send(Client, New_game_state),
    gleam@otp@actor:continue(New_game_state).

-spec handle_get_fen(game:game(), gleam@erlang@process:subject(binary())) -> gleam@otp@actor:next(any(), game:game()).
handle_get_fen(Game, Client) ->
    gleam@erlang@process:send(Client, game:to_fen(Game)),
    gleam@otp@actor:continue(Game).

-spec handle_print_board(game:game(), gleam@erlang@process:subject(nil)) -> gleam@otp@actor:next(message(), game:game()).
handle_print_board(Game, Client) ->
    game:print_board(Game),
    gleam@erlang@process:send(Client, nil),
    gleam@otp@actor:continue(Game).

-spec handle_message(message(), game:game()) -> gleam@otp@actor:next(message(), game:game()).
handle_message(Message, Game) ->
    case Message of
        {all_legal_moves, Client} ->
            handle_all_legal_moves(Game, Client);

        {apply_move, Client@1, Move} ->
            handle_apply_move(Game, Client@1, Move);

        {apply_move_uci, Client@2, Move@1} ->
            handle_apply_move_uci(Game, Client@2, Move@1);

        {undo_move, Client@3} ->
            handle_undo_move(Game, Client@3);

        {get_fen, Client@4} ->
            handle_get_fen(Game, Client@4);

        shutdown ->
            {stop, normal};

        {print_board, Client@5} ->
            handle_print_board(Game, Client@5)
    end.

-spec from_fen(binary()) -> gleam@erlang@process:subject(message()).
from_fen(Fen_string) ->
    Fen = fen:from_string(Fen_string),
    Status = in_progress,
    Ply = case erlang:element(3, Fen) of
        white ->
            (erlang:element(7, Fen) - 1) * 2;

        black ->
            ((erlang:element(7, Fen) - 1) * 2) + 1
    end,
    White_kingside_castle = case erlang:element(2, erlang:element(4, Fen)) of
        true ->
            yes;

        false ->
            {no, 1}
    end,
    White_queenside_castle = case erlang:element(3, erlang:element(4, Fen)) of
        true ->
            yes;

        false ->
            {no, 1}
    end,
    Black_kingside_castle = case erlang:element(4, erlang:element(4, Fen)) of
        true ->
            yes;

        false ->
            {no, 2}
    end,
    Black_queenside_castle = case erlang:element(5, erlang:element(4, Fen)) of
        true ->
            yes;

        false ->
            {no, 2}
    end,
    Game = {game,
        erlang:element(2, Fen),
        erlang:element(3, Fen),
        [],
        {some, Status},
        Ply,
        erlang:element(6, Fen),
        White_kingside_castle,
        White_queenside_castle,
        Black_kingside_castle,
        Black_queenside_castle,
        erlang:element(5, Fen)},
    _assert_subject = gleam@otp@actor:start(Game, fun handle_message/2),
    {ok, Actor} = case _assert_subject of
        {ok, _} -> _assert_subject;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"game_server"/utf8>>,
                        function => <<"from_fen"/utf8>>,
                        line => 148})
    end,
    Actor.

-spec new_game() -> gleam@erlang@process:subject(message()).
new_game() ->
    White_king_bitboard = {bitboard,
        2#0000000000000000000000000000000000000000000000000000000000001000},
    White_queen_bitboard = {bitboard,
        2#0000000000000000000000000000000000000000000000000000000000010000},
    White_rook_bitboard = {bitboard,
        2#0000000000000000000000000000000000000000000000000000000010000001},
    White_bishop_bitboard = {bitboard,
        2#0000000000000000000000000000000000000000000000000000000000100100},
    White_knight_bitboard = {bitboard,
        2#0000000000000000000000000000000000000000000000000000000001000010},
    White_pawns_bitboard = {bitboard,
        2#0000000000000000000000000000000000000000000000001111111100000000},
    Black_king_bitboard = {bitboard,
        2#0000100000000000000000000000000000000000000000000000000000000000},
    Black_queen_bitboard = {bitboard,
        2#0001000000000000000000000000000000000000000000000000000000000000},
    Black_rook_bitboard = {bitboard,
        2#1000000100000000000000000000000000000000000000000000000000000000},
    Black_bishop_bitboard = {bitboard,
        2#0010010000000000000000000000000000000000000000000000000000000000},
    Black_knight_bitboard = {bitboard,
        2#0100001000000000000000000000000000000000000000000000000000000000},
    Black_pawns_bitboard = {bitboard,
        2#0000000011111111000000000000000000000000000000000000000000000000},
    Board = {board_bb,
        Black_king_bitboard,
        Black_queen_bitboard,
        Black_rook_bitboard,
        Black_bishop_bitboard,
        Black_knight_bitboard,
        Black_pawns_bitboard,
        White_king_bitboard,
        White_queen_bitboard,
        White_rook_bitboard,
        White_bishop_bitboard,
        White_knight_bitboard,
        White_pawns_bitboard},
    Turn = white,
    History = [],
    Status = in_progress,
    Ply = 0,
    _assert_subject = gleam@otp@actor:start(
        {game,
            Board,
            Turn,
            History,
            {some, Status},
            Ply,
            0,
            yes,
            yes,
            yes,
            yes,
            none},
        fun handle_message/2
    ),
    {ok, Actor} = case _assert_subject of
        {ok, _} -> _assert_subject;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"game_server"/utf8>>,
                        function => <<"new_game"/utf8>>,
                        line => 237})
    end,
    Actor.