-module(gleam@result).
-compile(no_auto_import).

-export([is_ok/1, is_error/1, map/2, map_error/2, flatten/1, then/2, unwrap/2, lazy_unwrap/2, nil_error/1, 'or'/2, lazy_or/2, all/1, replace_error/2, values/1]).

-spec is_ok({ok, any()} | {error, any()}) -> boolean().
is_ok(Result) ->
    case Result of
        {error, _@1} ->
            false;

        {ok, _@2} ->
            true
    end.

-spec is_error({ok, any()} | {error, any()}) -> boolean().
is_error(Result) ->
    case Result of
        {ok, _@1} ->
            false;

        {error, _@2} ->
            true
    end.

-spec map({ok, BBL} | {error, BBM}, fun((BBL) -> BBP)) -> {ok, BBP} |
    {error, BBM}.
map(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, Fun(X)};

        {error, E} ->
            {error, E}
    end.

-spec map_error({ok, BBS} | {error, BBT}, fun((BBT) -> BBW)) -> {ok, BBS} |
    {error, BBW}.
map_error(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, X};

        {error, Error} ->
            {error, Fun(Error)}
    end.

-spec flatten({ok, {ok, BBZ} | {error, BCA}} | {error, BCA}) -> {ok, BBZ} |
    {error, BCA}.
flatten(Result) ->
    case Result of
        {ok, X} ->
            X;

        {error, Error} ->
            {error, Error}
    end.

-spec then({ok, BCH} | {error, BCI}, fun((BCH) -> {ok, BCL} | {error, BCI})) -> {ok,
                                                                                 BCL} |
    {error, BCI}.
then(Result, Fun) ->
    case Result of
        {ok, X} ->
            Fun(X);

        {error, E} ->
            {error, E}
    end.

-spec unwrap({ok, BCQ} | {error, any()}, BCQ) -> BCQ.
unwrap(Result, Default) ->
    case Result of
        {ok, V} ->
            V;

        {error, _@1} ->
            Default
    end.

-spec lazy_unwrap({ok, BCU} | {error, any()}, fun(() -> BCU)) -> BCU.
lazy_unwrap(Result, Default) ->
    case Result of
        {ok, V} ->
            V;

        {error, _@1} ->
            Default()
    end.

-spec nil_error({ok, BCY} | {error, any()}) -> {ok, BCY} | {error, nil}.
nil_error(Result) ->
    map_error(Result, fun(_) -> nil end).

-spec 'or'({ok, BDE} | {error, BDF}, {ok, BDE} | {error, BDF}) -> {ok, BDE} |
    {error, BDF}.
'or'(First, Second) ->
    case First of
        {ok, _@1} ->
            First;

        {error, _@2} ->
            Second
    end.

-spec lazy_or({ok, BDM} | {error, BDN}, fun(() -> {ok, BDM} | {error, BDN})) -> {ok,
                                                                                 BDM} |
    {error, BDN}.
lazy_or(First, Second) ->
    case First of
        {ok, _@1} ->
            First;

        {error, _@2} ->
            Second()
    end.

-spec all(list({ok, BDU} | {error, BDV})) -> {ok, list(BDU)} | {error, BDV}.
all(Results) ->
    gleam@list:try_map(Results, fun(X) -> X end).

-spec replace_error({ok, BEC} | {error, any()}, BEG) -> {ok, BEC} | {error, BEG}.
replace_error(Result, Error) ->
    _pipe = Result,
    map_error(_pipe, fun(_) -> Error end).

-spec values(list({ok, BEJ} | {error, any()})) -> list(BEJ).
values(Results) ->
    gleam@list:filter_map(Results, fun(R) -> R end).