assert(module:depends"muc".rooms, "This module is not required with Prosody >= 0.11");

module:hook("muc-config-form", function(event)

	local room, form = event.room, event.form;

	table.insert(form, {

		name = "muc#roomconfig_lang",

		type = "text-single",

		label = "Natural Language for Room Discussions",

		value = room._data.language,

	});

end);

module:hook("muc-config-submitted", function(event)

	local room, fields, changed = event.room, event.fields, event.changed;

	local new = fields["muc#roomconfig_lang"];

	if new ~= room._data.language then

		room._data.language = new;

		if type(changed) == "table" then

			changed["muc#roomconfig_lang"] = true;

		else

			event.changed = true;

		end

	end

end);

module:hook("muc-disco#info", function (event)

	local room, form, formdata = event.room, event.form, event.formdata;

	table.insert(form, {

		name = "muc#roominfo_lang",

		value = room._data.language,

	});

	formdata["muc#roominfo_lang"] = room._data.language;

end);