-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, AHW} | {error, AHX}, fun((AHW) -> AIA)) -> {ok, AIA} |
    {error, AHX}.
map(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, Fun(X)};

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

-spec map_error({ok, AID} | {error, AIE}, fun((AIE) -> AIH)) -> {ok, AID} |
    {error, AIH}.
map_error(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, X};

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

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

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

-spec then({ok, AIS} | {error, AIT}, fun((AIS) -> {ok, AIW} | {error, AIT})) -> {ok,
                                                                                 AIW} |
    {error, AIT}.
then(Result, Fun) ->
    case Result of
        {ok, X} ->
            Fun(X);

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

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

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

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

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

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

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

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

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

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

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

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

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