-module(gleam@result).
-compile([no_auto_import, nowarn_unused_vars]).

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

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

        {ok, _} ->
            true
    end.

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

        {error, _} ->
            true
    end.

-spec map({ok, BBZ} | {error, BCA}, fun((BBZ) -> BCD)) -> {ok, BCD} |
    {error, BCA}.
map(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, Fun(X)};

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

-spec map_error({ok, BCG} | {error, BCH}, fun((BCH) -> BCK)) -> {ok, BCG} |
    {error, BCK}.
map_error(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, X};

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

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

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

-spec then({ok, BCV} | {error, BCW}, fun((BCV) -> {ok, BCZ} | {error, BCW})) -> {ok,
        BCZ} |
    {error, BCW}.
then(Result, Fun) ->
    case Result of
        {ok, X} ->
            Fun(X);

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

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

        {error, _} ->
            Default
    end.

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

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

-spec unwrap_error({ok, any()} | {error, BDN}, BDN) -> BDN.
unwrap_error(Result, Default) ->
    case Result of
        {ok, _} ->
            Default;

        {error, E} ->
            E
    end.

-spec unwrap_both({ok, BDQ} | {error, BDQ}) -> BDQ.
unwrap_both(Result) ->
    case Result of
        {ok, A} ->
            A;

        {error, A@1} ->
            A@1
    end.

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

-spec 'or'({ok, BDZ} | {error, BEA}, {ok, BDZ} | {error, BEA}) -> {ok, BDZ} |
    {error, BEA}.
'or'(First, Second) ->
    case First of
        {ok, _} ->
            First;

        {error, _} ->
            Second
    end.

-spec lazy_or({ok, BEH} | {error, BEI}, fun(() -> {ok, BEH} | {error, BEI})) -> {ok,
        BEH} |
    {error, BEI}.
lazy_or(First, Second) ->
    case First of
        {ok, _} ->
            First;

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

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

-spec replace({ok, any()} | {error, BEY}, BFB) -> {ok, BFB} | {error, BEY}.
replace(Result, Value) ->
    case Result of
        {ok, _} ->
            {ok, Value};

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

-spec replace_error({ok, BFE} | {error, any()}, BFI) -> {ok, BFE} | {error, BFI}.
replace_error(Result, Error) ->
    case Result of
        {ok, X} ->
            {ok, X};

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

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