-- XEP-0313: Message Archive Management for Prosody

-- Copyright (C) 2011-2013 Kim Alvefur

--

-- This file is MIT/X11 licensed.

local st = require"util.stanza";

local default_attrs = {

	always = true, [true] = "always",

	never = false, [false] = "never",

	roster = "roster",

}

local function tostanza(prefs, xmlns_mam)

	local default = prefs[false];

	default = default_attrs[default];

	local prefstanza = st.stanza("prefs", { xmlns = xmlns_mam, default = default });

	local always = st.stanza("always");

	local never = st.stanza("never");

	for jid, choice in pairs(prefs) do

		if jid then

			(choice and always or never):tag("jid"):text(jid):up();

		end

	end

	prefstanza:add_child(always):add_child(never);

	return prefstanza;

end

local function fromstanza(prefstanza)

	local prefs = {};

	local default = prefstanza.attr.default;

	if default then

		prefs[false] = default_attrs[default];

	end

	local always = prefstanza:get_child("always");

	if always then

		for rule in always:childtags("jid") do

			local jid = rule:get_text();

			prefs[jid] = true;

		end

	end

	local never = prefstanza:get_child("never");

	if never then

		for rule in never:childtags("jid") do

			local jid = rule:get_text();

			prefs[jid] = false;

		end

	end

	return prefs;

end

return {

	tostanza = tostanza;

	fromstanza = fromstanza;

}