-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, 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, BBX} | {error, BBY}, fun((BBX) -> BCB)) -> {ok, BCB} |
    {error, BBY}.
map(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, Fun(X)};

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

-spec map_error({ok, BCE} | {error, BCF}, fun((BCF) -> BCI)) -> {ok, BCE} |
    {error, BCI}.
map_error(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, X};

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

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

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

-spec then({ok, BCT} | {error, BCU}, fun((BCT) -> {ok, BCX} | {error, BCU})) -> {ok,
        BCX} |
    {error, BCU}.
then(Result, Fun) ->
    case Result of
        {ok, X} ->
            Fun(X);

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

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

        {error, _} ->
            Default
    end.

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

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

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

        {error, E} ->
            E
    end.

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

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

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

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

        {error, _} ->
            Second
    end.

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

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

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

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

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

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

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

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