-module(telega@dialog@widget).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/telega/dialog/widget.gleam").
-export([current_page/1, pager/3, select/4, radio_value/1, radio/3, multiselect_values/1, multiselect/5, paged_select/5, store_data_key/2, stash_stores/1, clear_stash/0, widget_store/3, seed_store/3]).
-export_type([select_item/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

?MODULEDOC(
    " Built-in managed keyboard widgets for dialogs.\n"
    "\n"
    " A widget renders extra button rows for a window and handles their events\n"
    " itself (see `KeyboardWidget` in `telega/dialog/types`): the dialog engine\n"
    " appends widget rows after the window's own buttons and routes widget\n"
    " button presses (`w:<widget_id>:<cmd>` action ids) to the widget, bypassing\n"
    " the window's `on_action`. Widget state lives in a per-widget `WidgetStore`\n"
    " persisted with the dialog instance, so selections and page positions\n"
    " survive restarts.\n"
    "\n"
    " Built-ins:\n"
    "\n"
    " - `pager` — page navigation row (`‹ 2/5 ›`); read the page with\n"
    "   `current_page` to slice content in the window's render.\n"
    " - `select` — one-shot choice: a press calls `on_selected` (usually a\n"
    "   `Goto`).\n"
    " - `radio` — single choice kept in the store, marked with\n"
    "   `labels.checked`; read with `radio_value`.\n"
    " - `multiselect` — a set of choices with checkboxes and a `done` button\n"
    "   shown only while the selection count is within `min`/`max`; read with\n"
    "   `multiselect_values`.\n"
    " - `paged_select` — `select` and `pager` combined: items are sliced by the\n"
    "   widget itself.\n"
    "\n"
    " Reading widget state from window handlers (`on_action`, `on_text`,\n"
    " `on_done`) and renders goes through `dialog.widget_store`:\n"
    "\n"
    " ```gleam\n"
    " let zone =\n"
    "   dialog.widget_store(ctx, window_id: \"prefs\", widget_id: \"zone\")\n"
    "   |> widget.radio_value\n"
    "   |> option.unwrap(\"hall\")\n"
    " ```\n"
    "\n"
    " All user-facing symbols (`‹`, `›`, `●`, `☑`, \"done\") come from the\n"
    " dialog's `Labels` — override them with `dialog.with_labels` for i18n.\n"
).

-type select_item() :: {select_item, binary(), binary()}.

-file("src/telega/dialog/widget.gleam", 334).
-spec action(binary(), binary()) -> binary().
action(Widget_id, Cmd) ->
    <<<<<<"w:"/utf8, Widget_id/binary>>/binary, ":"/utf8>>/binary, Cmd/binary>>.

-file("src/telega/dialog/widget.gleam", 387).
-spec clamp_page(integer(), integer()) -> integer().
clamp_page(Page, Pages) ->
    gleam@int:clamp(Page, 0, gleam@int:max(Pages - 1, 0)).

-file("src/telega/dialog/widget.gleam", 100).
?DOC(" The current 0-based page kept by a `pager`/`paged_select` store.\n").
-spec current_page(telega@dialog@types:widget_store()) -> integer().
current_page(Store) ->
    _pipe = telega@dialog@types:store_get(Store, <<"page"/utf8>>),
    _pipe@1 = gleam@option:map(_pipe, fun gleam_stdlib:parse_int/1),
    _pipe@2 = gleam@option:map(_pipe@1, fun gleam@option:from_result/1),
    _pipe@3 = gleam@option:flatten(_pipe@2),
    gleam@option:unwrap(_pipe@3, 0).

-file("src/telega/dialog/widget.gleam", 391).
-spec turn_page(telega@dialog@types:widget_store(), binary(), integer()) -> telega@dialog@types:widget_store().
turn_page(Store, Cmd, Pages) ->
    Page = current_page(Store),
    Page@1 = case Cmd of
        <<"prev"/utf8>> ->
            Page - 1;

        <<"next"/utf8>> ->
            Page + 1;

        _ ->
            Page
    end,
    telega@dialog@types:store_set(
        Store,
        <<"page"/utf8>>,
        erlang:integer_to_binary(clamp_page(Page@1, Pages))
    ).

-file("src/telega/dialog/widget.gleam", 380).
-spec page_count(integer(), integer()) -> integer().
page_count(Total, Page_size) ->
    case (Total =< 0) orelse (Page_size =< 0) of
        true ->
            1;

        false ->
            case Page_size of
                0 -> 0;
                Gleam@denominator -> ((Total + Page_size) - 1) div Gleam@denominator
            end
    end.

-file("src/telega/dialog/widget.gleam", 401).
-spec pager_row(binary(), integer(), integer(), telega@dialog@types:labels()) -> list(list(telega@dialog@types:dialog_button())).
pager_row(Widget_id, Page, Pages, Labels) ->
    case Pages > 1 of
        false ->
            [];

        true ->
            Info = begin
                _pipe = erlang:element(4, Labels),
                _pipe@1 = gleam@string:replace(
                    _pipe,
                    <<"{current}"/utf8>>,
                    erlang:integer_to_binary(Page + 1)
                ),
                gleam@string:replace(
                    _pipe@1,
                    <<"{total}"/utf8>>,
                    erlang:integer_to_binary(Pages)
                )
            end,
            [[{action_button,
                        erlang:element(2, Labels),
                        action(Widget_id, <<"prev"/utf8>>)},
                    {noop_button, Info},
                    {action_button,
                        erlang:element(3, Labels),
                        action(Widget_id, <<"next"/utf8>>)}]]
    end.

-file("src/telega/dialog/widget.gleam", 74).
?DOC(
    " Page navigation: the store keeps the current page, the row renders as\n"
    " `‹  2/5  ›` (the counter is a no-op button). `total` returns the number of\n"
    " items; the row disappears when everything fits on one page. Slice your\n"
    " content in the window's render with `current_page`.\n"
).
-spec pager(
    binary(),
    integer(),
    fun((AWKD, telega@bot:context(AWKE, AWKF, AWKG)) -> integer())
) -> telega@dialog@types:keyboard_widget(AWKD, AWKE, AWKF, AWKG).
pager(Id, Page_size, Total) ->
    {keyboard_widget,
        Id,
        fun(Wctx) ->
            Pages = page_count(
                Total(erlang:element(2, Wctx), erlang:element(5, Wctx)),
                Page_size
            ),
            pager_row(
                Id,
                clamp_page(current_page(erlang:element(3, Wctx)), Pages),
                Pages,
                erlang:element(4, Wctx)
            )
        end,
        fun(Wctx@1, Cmd, _) ->
            Pages@1 = page_count(
                Total(erlang:element(2, Wctx@1), erlang:element(5, Wctx@1)),
                Page_size
            ),
            {ok,
                {store_updated,
                    turn_page(erlang:element(3, Wctx@1), Cmd, Pages@1)}}
        end,
        [],
        [action(Id, <<"prev"/utf8>>), action(Id, <<"next"/utf8>>)]}.

-file("src/telega/dialog/widget.gleam", 372).
-spec offers(
    fun((AWNY, telega@bot:context(AWNZ, AWOA, AWOB)) -> list(select_item())),
    telega@dialog@types:widget_ctx(AWNY, AWNZ, AWOA, AWOB),
    binary()
) -> boolean().
offers(Items, Wctx, Item_id) ->
    gleam@list:any(
        Items(erlang:element(2, Wctx), erlang:element(5, Wctx)),
        fun(Item) -> erlang:element(2, Item) =:= Item_id end
    ).

-file("src/telega/dialog/widget.gleam", 353).
?DOC(
    " A picked id is only trusted if the widget currently offers it — callback\n"
    " data arrives from the client and can be forged or outdated, so an unknown\n"
    " id is ignored (re-render) instead of reaching `on_selected`.\n"
).
-spec pick_or_ignore(
    telega@dialog@types:widget_ctx(AWNC, AWND, AWNE, AWNF),
    binary(),
    gleam@option:option(binary()),
    fun((AWNC, telega@bot:context(AWND, AWNE, AWNF)) -> list(select_item())),
    fun((AWNC, binary(), telega@bot:context(AWND, AWNE, AWNF)) -> {ok,
            telega@dialog@types:dialog_action(AWNC)} |
        {error, AWNE})
) -> {ok, telega@dialog@types:widget_result(AWNC)} | {error, AWNE}.
pick_or_ignore(Wctx, Cmd, Arg, Items, On_selected) ->
    case {Cmd, Arg} of
        {<<"pick"/utf8>>, {some, Item_id}} ->
            case offers(Items, Wctx, Item_id) of
                true ->
                    _pipe = On_selected(
                        erlang:element(2, Wctx),
                        Item_id,
                        erlang:element(5, Wctx)
                    ),
                    gleam@result:map(_pipe, fun(Field@0) -> {emit, Field@0} end);

                false ->
                    {ok, {store_updated, erlang:element(3, Wctx)}}
            end;

        {_, _} ->
            {ok, {store_updated, erlang:element(3, Wctx)}}
    end.

-file("src/telega/dialog/widget.gleam", 338).
-spec item_grid(list(select_item()), binary(), integer()) -> list(list(telega@dialog@types:dialog_button())).
item_grid(Items, Widget_id, Columns) ->
    _pipe = Items,
    _pipe@1 = gleam@list:map(
        _pipe,
        fun(Item) ->
            {action_arg_button,
                erlang:element(3, Item),
                action(Widget_id, <<"pick"/utf8>>),
                erlang:element(2, Item)}
        end
    ),
    gleam@list:sized_chunk(_pipe@1, gleam@int:max(Columns, 1)).

-file("src/telega/dialog/widget.gleam", 114).
?DOC(
    " One-shot choice: each item is a button, a press calls `on_selected` with\n"
    " the item id and the resulting `DialogAction` is applied (usually a\n"
    " `Goto`). Nothing is stored. `columns` lays the buttons out in a grid\n"
    " (`1` = one item per row).\n"
).
-spec select(
    binary(),
    fun((AWKO, telega@bot:context(AWKP, AWKQ, AWKR)) -> list(select_item())),
    integer(),
    fun((AWKO, binary(), telega@bot:context(AWKP, AWKQ, AWKR)) -> {ok,
            telega@dialog@types:dialog_action(AWKO)} |
        {error, AWKQ})
) -> telega@dialog@types:keyboard_widget(AWKO, AWKP, AWKQ, AWKR).
select(Id, Items, Columns, On_selected) ->
    {keyboard_widget,
        Id,
        fun(Wctx) ->
            _pipe = Items(erlang:element(2, Wctx), erlang:element(5, Wctx)),
            item_grid(_pipe, Id, Columns)
        end,
        fun(Wctx@1, Cmd, Arg) ->
            pick_or_ignore(Wctx@1, Cmd, Arg, Items, On_selected)
        end,
        [],
        [action(Id, <<"pick"/utf8>>)]}.

-file("src/telega/dialog/widget.gleam", 189).
?DOC(" The item id picked in a `radio` store, `None` until the first press.\n").
-spec radio_value(telega@dialog@types:widget_store()) -> gleam@option:option(binary()).
radio_value(Store) ->
    telega@dialog@types:store_get(Store, <<"value"/utf8>>).

-file("src/telega/dialog/widget.gleam", 145).
?DOC(
    " Single choice kept in the widget store: the selected item is marked with\n"
    " `labels.checked`, the rest with `labels.unchecked`. `default` is only a\n"
    " visual pre-selection — `radio_value` stays `None` until the user actually\n"
    " picks, so apply the same default when reading.\n"
).
-spec radio(
    binary(),
    fun((AWLG, telega@bot:context(AWLH, AWLI, AWLJ)) -> list(select_item())),
    gleam@option:option(binary())
) -> telega@dialog@types:keyboard_widget(AWLG, AWLH, AWLI, AWLJ).
radio(Id, Items, Default) ->
    {keyboard_widget,
        Id,
        fun(Wctx) ->
            Selected = begin
                _pipe = radio_value(erlang:element(3, Wctx)),
                gleam@option:'or'(_pipe, Default)
            end,
            _pipe@1 = Items(erlang:element(2, Wctx), erlang:element(5, Wctx)),
            gleam@list:map(
                _pipe@1,
                fun(Item) ->
                    Mark = case Selected =:= {some, erlang:element(2, Item)} of
                        true ->
                            erlang:element(5, erlang:element(4, Wctx));

                        false ->
                            erlang:element(6, erlang:element(4, Wctx))
                    end,
                    [{action_arg_button,
                            <<Mark/binary, (erlang:element(3, Item))/binary>>,
                            action(Id, <<"pick"/utf8>>),
                            erlang:element(2, Item)}]
                end
            )
        end,
        fun(Wctx@1, Cmd, Arg) -> case {Cmd, Arg} of
                {<<"pick"/utf8>>, {some, Item_id}} ->
                    case offers(Items, Wctx@1, Item_id) of
                        true ->
                            {ok,
                                {store_updated,
                                    telega@dialog@types:store_set(
                                        erlang:element(3, Wctx@1),
                                        <<"value"/utf8>>,
                                        Item_id
                                    )}};

                        false ->
                            {ok, {store_updated, erlang:element(3, Wctx@1)}}
                    end;

                {_, _} ->
                    {ok, {store_updated, erlang:element(3, Wctx@1)}}
            end end,
        [],
        [action(Id, <<"pick"/utf8>>)]}.

-file("src/telega/dialog/widget.gleam", 257).
?DOC(" The item ids currently selected in a `multiselect` store, in pick order.\n").
-spec multiselect_values(telega@dialog@types:widget_store()) -> list(binary()).
multiselect_values(Store) ->
    _pipe = telega@dialog@types:store_get(Store, <<"values"/utf8>>),
    _pipe@2 = gleam@option:map(
        _pipe,
        fun(Raw) ->
            _pipe@1 = gleam@json:parse(
                Raw,
                gleam@dynamic@decode:list(
                    {decoder, fun gleam@dynamic@decode:decode_string/1}
                )
            ),
            gleam@result:unwrap(_pipe@1, [])
        end
    ),
    gleam@option:unwrap(_pipe@2, []).

-file("src/telega/dialog/widget.gleam", 283).
-spec within(integer(), integer(), integer()) -> boolean().
within(Count, Min, Max) ->
    (Min =< Count) andalso (Count =< Max).

-file("src/telega/dialog/widget.gleam", 266).
-spec toggle(telega@dialog@types:widget_store(), binary(), integer()) -> telega@dialog@types:widget_store().
toggle(Store, Item_id, Max) ->
    Values = multiselect_values(Store),
    Values@1 = case gleam@list:contains(Values, Item_id) of
        true ->
            gleam@list:filter(Values, fun(Value) -> Value /= Item_id end);

        false ->
            case erlang:length(Values) >= Max of
                true ->
                    Values;

                false ->
                    lists:append(Values, [Item_id])
            end
    end,
    telega@dialog@types:store_set(
        Store,
        <<"values"/utf8>>,
        gleam@json:to_string(
            gleam@json:array(Values@1, fun gleam@json:string/1)
        )
    ).

-file("src/telega/dialog/widget.gleam", 199).
?DOC(
    " A set of choices with checkbox marks. Toggling above `max` is ignored;\n"
    " the `labels.done` button renders only while the count is within\n"
    " `min`/`max` and emits `Goto(done, state)` when pressed. `done` must be an\n"
    " existing window id — validated by `dialog.build()`.\n"
).
-spec multiselect(
    binary(),
    fun((AWLU, telega@bot:context(AWLV, AWLW, AWLX)) -> list(select_item())),
    integer(),
    integer(),
    binary()
) -> telega@dialog@types:keyboard_widget(AWLU, AWLV, AWLW, AWLX).
multiselect(Id, Items, Min, Max, Done) ->
    {keyboard_widget,
        Id,
        fun(Wctx) ->
            Selected = multiselect_values(erlang:element(3, Wctx)),
            Rows = begin
                _pipe = Items(erlang:element(2, Wctx), erlang:element(5, Wctx)),
                gleam@list:map(
                    _pipe,
                    fun(Item) ->
                        Mark = case gleam@list:contains(
                            Selected,
                            erlang:element(2, Item)
                        ) of
                            true ->
                                erlang:element(7, erlang:element(4, Wctx));

                            false ->
                                erlang:element(8, erlang:element(4, Wctx))
                        end,
                        [{action_arg_button,
                                <<Mark/binary,
                                    (erlang:element(3, Item))/binary>>,
                                action(Id, <<"tgl"/utf8>>),
                                erlang:element(2, Item)}]
                    end
                )
            end,
            case within(erlang:length(Selected), Min, Max) of
                true ->
                    lists:append(
                        Rows,
                        [[{action_button,
                                    erlang:element(9, erlang:element(4, Wctx)),
                                    action(Id, <<"done"/utf8>>)}]]
                    );

                false ->
                    Rows
            end
        end,
        fun(Wctx@1, Cmd, Arg) -> case {Cmd, Arg} of
                {<<"tgl"/utf8>>, {some, Item_id}} ->
                    case offers(Items, Wctx@1, Item_id) of
                        true ->
                            {ok,
                                {store_updated,
                                    toggle(
                                        erlang:element(3, Wctx@1),
                                        Item_id,
                                        Max
                                    )}};

                        false ->
                            {ok, {store_updated, erlang:element(3, Wctx@1)}}
                    end;

                {<<"done"/utf8>>, _} ->
                    case within(
                        erlang:length(
                            multiselect_values(erlang:element(3, Wctx@1))
                        ),
                        Min,
                        Max
                    ) of
                        true ->
                            {ok,
                                {emit, {goto, Done, erlang:element(2, Wctx@1)}}};

                        false ->
                            {ok, {store_updated, erlang:element(3, Wctx@1)}}
                    end;

                {_, _} ->
                    {ok, {store_updated, erlang:element(3, Wctx@1)}}
            end end,
        [Done],
        [action(Id, <<"tgl"/utf8>>), action(Id, <<"done"/utf8>>)]}.

-file("src/telega/dialog/widget.gleam", 292).
?DOC(
    " `select` and `pager` in one widget: items are sliced to the current page\n"
    " by the widget itself (`page_size` counts items, not rows), the pager row\n"
    " appears only when there is more than one page.\n"
).
-spec paged_select(
    binary(),
    fun((AWMH, telega@bot:context(AWMI, AWMJ, AWMK)) -> list(select_item())),
    integer(),
    integer(),
    fun((AWMH, binary(), telega@bot:context(AWMI, AWMJ, AWMK)) -> {ok,
            telega@dialog@types:dialog_action(AWMH)} |
        {error, AWMJ})
) -> telega@dialog@types:keyboard_widget(AWMH, AWMI, AWMJ, AWMK).
paged_select(Id, Items, Page_size, Columns, On_selected) ->
    {keyboard_widget,
        Id,
        fun(Wctx) ->
            All = Items(erlang:element(2, Wctx), erlang:element(5, Wctx)),
            Pages = page_count(erlang:length(All), Page_size),
            Page = clamp_page(current_page(erlang:element(3, Wctx)), Pages),
            Rows = begin
                _pipe = All,
                _pipe@1 = gleam@list:drop(_pipe, Page * Page_size),
                _pipe@2 = gleam@list:take(_pipe@1, Page_size),
                item_grid(_pipe@2, Id, Columns)
            end,
            lists:append(
                Rows,
                pager_row(Id, Page, Pages, erlang:element(4, Wctx))
            )
        end,
        fun(Wctx@1, Cmd, Arg) -> case Cmd of
                <<"pick"/utf8>> ->
                    pick_or_ignore(Wctx@1, Cmd, Arg, Items, On_selected);

                _ ->
                    Pages@1 = page_count(
                        erlang:length(
                            Items(
                                erlang:element(2, Wctx@1),
                                erlang:element(5, Wctx@1)
                            )
                        ),
                        Page_size
                    ),
                    {ok,
                        {store_updated,
                            turn_page(erlang:element(3, Wctx@1), Cmd, Pages@1)}}
            end end,
        [],
        [action(Id, <<"pick"/utf8>>),
            action(Id, <<"prev"/utf8>>),
            action(Id, <<"next"/utf8>>)]}.

-file("src/telega/dialog/widget.gleam", 440).
?DOC(false).
-spec store_data_key(binary(), binary()) -> binary().
store_data_key(Window_id, Widget_id) ->
    <<<<<<"__dialog_widget:"/utf8, Window_id/binary>>/binary, ":"/utf8>>/binary,
        Widget_id/binary>>.

-file("src/telega/dialog/widget.gleam", 449).
?DOC(false).
-spec stash_stores(gleam@dict:dict(binary(), binary())) -> nil.
stash_stores(Data) ->
    _ = erlang:put(<<"__telega_dialog_widget_stores"/utf8>>, Data),
    nil.

-file("src/telega/dialog/widget.gleam", 457).
?DOC(false).
-spec clear_stash() -> nil.
clear_stash() ->
    _ = erlang:erase(<<"__telega_dialog_widget_stores"/utf8>>),
    nil.

-file("src/telega/dialog/widget.gleam", 493).
-spec stashed_stores() -> gleam@dict:dict(binary(), binary()).
stashed_stores() ->
    _pipe = erlang:get(<<"__telega_dialog_widget_stores"/utf8>>),
    _pipe@1 = gleam@dynamic@decode:run(
        _pipe,
        gleam@dynamic@decode:dict(
            {decoder, fun gleam@dynamic@decode:decode_string/1},
            {decoder, fun gleam@dynamic@decode:decode_string/1}
        )
    ),
    gleam@result:unwrap(_pipe@1, maps:new()).

-file("src/telega/dialog/widget.gleam", 465).
?DOC(
    " Read a widget's store from inside a window render or handler. Returns an\n"
    " empty store when the widget has no state yet. Prefer the typed readers on\n"
    " top: `radio_value`, `multiselect_values`, `current_page`.\n"
).
-spec widget_store(telega@bot:context(any(), any(), any()), binary(), binary()) -> telega@dialog@types:widget_store().
widget_store(_, Window_id, Widget_id) ->
    _pipe = stashed_stores(),
    _pipe@1 = gleam_stdlib:map_get(_pipe, store_data_key(Window_id, Widget_id)),
    _pipe@2 = gleam@result:'try'(
        _pipe@1,
        fun(Raw) -> telega@dialog@types:decode_store(Raw) end
    ),
    gleam@result:unwrap(_pipe@2, telega@dialog@types:new_store()).

-file("src/telega/dialog/widget.gleam", 478).
?DOC(
    " Seed a widget store for pure render tests — the runtime equivalent is the\n"
    " engine's automatic stash before user code. Merges into the current stash.\n"
).
-spec seed_store(binary(), binary(), telega@dialog@types:widget_store()) -> nil.
seed_store(Window_id, Widget_id, Store) ->
    Stores = gleam@dict:insert(
        stashed_stores(),
        store_data_key(Window_id, Widget_id),
        telega@dialog@types:encode_store(Store)
    ),
    _ = erlang:put(<<"__telega_dialog_widget_stores"/utf8>>, Stores),
    nil.