-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, BFB} | {error, BFC}, fun((BFB) -> BFF)) -> {ok, BFF} |
    {error, BFC}.
map(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, Fun(X)};

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

-spec map_error({ok, BFI} | {error, BFJ}, fun((BFJ) -> BFM)) -> {ok, BFI} |
    {error, BFM}.
map_error(Result, Fun) ->
    case Result of
        {ok, X} ->
            {ok, X};

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

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

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

-spec 'try'({ok, BFX} | {error, BFY}, fun((BFX) -> {ok, BGB} | {error, BFY})) -> {ok,
        BGB} |
    {error, BFY}.
'try'(Result, Fun) ->
    case Result of
        {ok, X} ->
            Fun(X);

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

-spec then({ok, BGG} | {error, BGH}, fun((BGG) -> {ok, BGK} | {error, BGH})) -> {ok,
        BGK} |
    {error, BGH}.
then(Result, Fun) ->
    'try'(Result, Fun).

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

        {error, _} ->
            Default
    end.

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

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

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

        {error, E} ->
            E
    end.

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

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

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

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

        {error, _} ->
            Second
    end.

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

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

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

-spec do_partition(list({ok, BIP} | {error, BIQ}), list(BIP), list(BIQ)) -> {list(BIP),
    list(BIQ)}.
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, BII} | {error, BIJ})) -> {list(BII), list(BIJ)}.
partition(Results) ->
    do_partition(Results, [], []).

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

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

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

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

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

-spec try_recover(
    {ok, BJR} | {error, BJS},
    fun((BJS) -> {ok, BJR} | {error, BJV})
) -> {ok, BJR} | {error, BJV}.
try_recover(Result, Fun) ->
    case Result of
        {ok, Value} ->
            {ok, Value};

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