-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, AHG} | {error, AHH}, fun((AHG) -> AHK)) -> {ok, AHK} |
    {error, AHH}.
map(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, Fun(X)};

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

-spec map_error({ok, AHN} | {error, AHO}, fun((AHO) -> AHR)) -> {ok, AHN} |
    {error, AHR}.
map_error(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, X};

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

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

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

-spec then({ok, AIC} | {error, AID}, fun((AIC) -> {ok, AIG} | {error, AID})) -> {ok,
                                                                                 AIG} |
    {error, AID}.
then(Result, Fun) ->
    case Result of
        {ok, X} ->
            Fun(X);

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

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

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

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

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

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

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

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

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

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

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

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

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