-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- Copyright (C) 2014 Daurnimator

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local st = require "util.stanza";

local function create_subject_message(from, subject)

	return st.message({from = from; type = "groupchat"})

		:tag("subject"):text(subject):up();

end

local function get_changesubject(room)

	return room._data.changesubject;

end

local function set_changesubject(room, changesubject)

	changesubject = changesubject and true or nil;

	if get_changesubject(room) == changesubject then return false; end

	room._data.changesubject = changesubject;

	if room.save then room:save(true); end

	return true;

end

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

	table.insert(event.form, {

		name = "muc#roomconfig_changesubject";

		type = "boolean";

		label = "Allow Occupants to Change Subject?";

		value = get_changesubject(event.room);

	});

end);

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

	local new = event.fields["muc#roomconfig_changesubject"];

	if new ~= nil and set_changesubject(event.room, new) then

		event.status_codes["104"] = true;

	end

end);

local function get_subject(room)

	-- a <message/> stanza from the room JID (or from the occupant JID of the entity that set the subject)

	return room._data.subject_from or room.jid, room._data.subject;

end

local function send_subject(room, to)

	local msg = create_subject_message(get_subject(room));

	msg.attr.to = to;

	room:route_stanza(msg);

end

local function set_subject(room, from, subject)

	if subject == "" then subject = nil; end

	local old_from, old_subject = get_subject(room);

	if old_subject == subject and old_from == from then return false; end

	room._data.subject_from = from;

	room._data.subject = subject;

	if room.save then room:save(); end

	local msg = create_subject_message(from, subject);

	room:broadcast_message(msg);

	return true;

end

-- Send subject to joining user

module:hook("muc-occupant-session-new", function(event)

	send_subject(event.room, event.stanza.attr.from);

end, 20);

	end

return {

	get_changesubject = get_changesubject;

	set_changesubject = set_changesubject;

	get = get_subject;

	set = set_subject;

	send = send_subject;

};