sprocket

-module(sprocket@internal@utils@ordered_map).
-compile([no_auto_import, nowarn_unused_vars]).

-export([from/3, size/1, iter/1, next/1, fold/3, map/2, new/0, from_list/1, insert/3, update/3, has_key/2, get/2, remove/2, index_map/2, find_next/2, find_previous/2]).
-export_type([keyed_item/2, ordered_map/2, ordered_map_iter/2]).

-type keyed_item(JLG, JLH) :: {keyed_item, JLG, JLH}.

-opaque ordered_map(JLI, JLJ) :: {ordered_map,
        list(keyed_item(JLI, JLJ)),
        gleam@map:map_(JLI, JLJ),
        integer()}.

-opaque ordered_map_iter(JLK, JLL) :: {ordered_map_iter,
        list(keyed_item(JLK, JLL))}.

-spec from(list(keyed_item(JLQ, JLR)), gleam@map:map_(JLQ, JLR), integer()) -> ordered_map(JLQ, JLR).
from(Ordered, Map, Size) ->
    {ordered_map, Ordered, Map, Size}.

-spec size(ordered_map(any(), any())) -> integer().
size(M) ->
    erlang:element(4, M).

-spec iter(ordered_map(JNM, JNN)) -> ordered_map_iter(JNM, JNN).
iter(M) ->
    _pipe = erlang:element(2, M),
    {ordered_map_iter, _pipe}.

-spec next(ordered_map_iter(JNS, JNT)) -> {ok,
        {ordered_map_iter(JNS, JNT), keyed_item(JNS, JNT)}} |
    {error, nil}.
next(Iter) ->
    case Iter of
        {ordered_map_iter, []} ->
            {error, nil};

        {ordered_map_iter, [Item | Rest]} ->
            {ok, {{ordered_map_iter, Rest}, Item}}
    end.

-spec fold(ordered_map(JOC, JOD), JOG, fun((JOG, keyed_item(JOC, JOD)) -> JOG)) -> JOG.
fold(M, Acc, Func) ->
    _pipe = erlang:element(2, M),
    gleam@list:fold(_pipe, Acc, Func).

-spec map(ordered_map(JOJ, JOK), fun((keyed_item(JOJ, JOK)) -> JOP)) -> list(JOP).
map(M, Func) ->
    _pipe = erlang:element(2, M),
    gleam@list:map(_pipe, Func).

-spec new() -> ordered_map(any(), any()).
new() ->
    {ordered_map, [], gleam@map:new(), 0}.

-spec from_list(list(keyed_item(JLZ, JMA))) -> ordered_map(JLZ, JMA).
from_list(Ordered) ->
    {R_ordered, Map@1, Size@1} = begin
        _pipe = Ordered,
        gleam@list:fold(
            _pipe,
            {[], gleam@map:new(), 0},
            fun(Acc, Keyed_item) ->
                {Ordered@1, Map, Size} = Acc,
                {keyed_item, Key, Value} = Keyed_item,
                Keyed_item@1 = {keyed_item, Key, Value},
                case gleam@map:has_key(Map, Key) of
                    true ->
                        {Ordered@1, Map, Size};

                    false ->
                        {[Keyed_item@1 | Ordered@1],
                            gleam@map:insert(Map, Key, Value),
                            Size + 1}
                end
            end
        )
    end,
    {ordered_map, gleam@list:reverse(R_ordered), Map@1, Size@1}.

-spec insert(ordered_map(JMG, JMH), JMG, JMH) -> ordered_map(JMG, JMH).
insert(M, Key, Value) ->
    {ordered_map,
        gleam@list:reverse(
            [{keyed_item, Key, Value} |
                gleam@list:reverse(erlang:element(2, M))]
        ),
        gleam@map:insert(erlang:element(3, M), Key, Value),
        erlang:element(4, M) + 1}.

-spec update(ordered_map(JMM, JMN), JMM, JMN) -> ordered_map(JMM, JMN).
update(M, Key, Value) ->
    case gleam@map:has_key(erlang:element(3, M), Key) of
        true ->
            {ordered_map,
                gleam@list:map(
                    erlang:element(2, M),
                    fun(Keyed_item) ->
                        {keyed_item, K, _} = Keyed_item,
                        case K =:= Key of
                            true ->
                                {keyed_item, Key, Value};

                            false ->
                                Keyed_item
                        end
                    end
                ),
                gleam@map:insert(erlang:element(3, M), Key, Value),
                erlang:element(4, M)};

        false ->
            M
    end.

-spec has_key(ordered_map(JMS, any()), JMS) -> boolean().
has_key(M, Key) ->
    gleam@map:has_key(erlang:element(3, M), Key).

-spec get(ordered_map(JMW, JMX), JMW) -> {ok, JMX} | {error, nil}.
get(M, Key) ->
    gleam@map:get(erlang:element(3, M), Key).

-spec remove(ordered_map(JNC, JND), JNC) -> ordered_map(JNC, JND).
remove(M, Key) ->
    case gleam@map:has_key(erlang:element(3, M), Key) of
        true ->
            {ordered_map,
                erlang:element(2, M),
                gleam@map:delete(erlang:element(3, M), Key),
                erlang:element(4, M) - 1};

        false ->
            M
    end.

-spec index_map(
    ordered_map(JOR, JOS),
    fun((integer(), keyed_item(JOR, JOS)) -> JOX)
) -> list(JOX).
index_map(M, Func) ->
    _pipe = erlang:element(2, M),
    gleam@list:index_map(_pipe, Func).

-spec find_next_helper(list(keyed_item(any(), JPG))) -> {ok, JPG} | {error, nil}.
find_next_helper(Ordered) ->
    case Ordered of
        [Item | _] ->
            {ok, erlang:element(3, Item)};

        _ ->
            {error, nil}
    end.

-spec find_next(ordered_map(JOZ, JPA), JOZ) -> {ok, JPA} | {error, nil}.
find_next(M, Key) ->
    case erlang:element(2, M) of
        [] ->
            {error, nil};

        [Item | Rest] ->
            case Item of
                {keyed_item, K, V} ->
                    case K =:= Key of
                        true ->
                            find_next_helper(Rest);

                        false ->
                            find_next(
                                {ordered_map,
                                    Rest,
                                    erlang:element(3, M),
                                    erlang:element(4, M)},
                                Key
                            )
                    end
            end
    end.

-spec find_previous_helper(ordered_map(JPS, JPT), JPS, {ok, JPT} | {error, nil}) -> {ok,
        JPT} |
    {error, nil}.
find_previous_helper(M, Key, Prev) ->
    case erlang:element(2, M) of
        [] ->
            {error, nil};

        [Item | Rest] ->
            case Item of
                {keyed_item, K, V} ->
                    case K =:= Key of
                        true ->
                            Prev;

                        false ->
                            find_previous_helper(
                                {ordered_map,
                                    Rest,
                                    erlang:element(3, M),
                                    erlang:element(4, M)},
                                Key,
                                {ok, V}
                            )
                    end
            end
    end.

-spec find_previous(ordered_map(JPM, JPN), JPM) -> {ok, JPN} | {error, nil}.
find_previous(M, Key) ->
    find_previous_helper(M, Key, {error, nil}).