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

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

-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, BGE} | {error, BGF}, fun((BGE) -> BGI)) -> {ok, BGI} |
    {error, BGF}.
map(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, Fun(X)};

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

-spec map_error({ok, BGL} | {error, BGM}, fun((BGM) -> BGP)) -> {ok, BGL} |
    {error, BGP}.
map_error(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, X};

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

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

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

-spec 'try'({ok, BHA} | {error, BHB}, fun((BHA) -> {ok, BHE} | {error, BHB})) -> {ok,
        BHE} |
    {error, BHB}.
'try'(Result, Fun) ->
    case Result of
        {ok, X} ->
            Fun(X);

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

-spec then({ok, BHJ} | {error, BHK}, fun((BHJ) -> {ok, BHN} | {error, BHK})) -> {ok,
        BHN} |
    {error, BHK}.
then(Result, Fun) ->
    'try'(Result, Fun).

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

        {error, _} ->
            Default
    end.

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

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

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

        {error, E} ->
            E
    end.

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

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

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

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

        {error, _} ->
            Second
    end.

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

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

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

-spec do_partition(list({ok, BJS} | {error, BJT}), list(BJS), list(BJT)) -> {list(BJS),
    list(BJT)}.
do_partition(Results, Oks, Errors) ->
    case Results of
        [] ->
            {Oks, Errors};

        [{ok, A} | Rest] ->
            do_partition(Rest, [A | Oks], Errors);

        [{error, E} | Rest@1] ->
            do_partition(Rest@1, Oks, [E | Errors])
    end.

-spec partition(list({ok, BJL} | {error, BJM})) -> {list(BJL), list(BJM)}.
partition(Results) ->
    do_partition(Results, [], []).

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

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

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

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

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

-spec try_recover(
    {ok, BKU} | {error, BKV},
    fun((BKV) -> {ok, BKU} | {error, BKY})
) -> {ok, BKU} | {error, BKY}.
try_recover(Result, Fun) ->
    case Result of
        {ok, Value} ->
            {ok, Value};

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