local prosody = prosody;

local hosts = prosody.hosts;

local tostring = tostring;

local split_jid = require "util.jid".split;

local cm = require "core.configmanager";

local datamanager = require "util.datamanager";

local data_load, data_store, data_getpath = datamanager.load, datamanager.store, datamanager.getpath;

local datastore = "muc_log";

local error_reply = require "util.stanza".error_reply;

local storagemanager = storagemanager;

local mod_host = module:get_host();

local log_presences = module:get_option_boolean("muc_log_presences", false);

-- Helper Functions

local function inject_storage_config()

	local _storage = cm.getconfig()[mod_host].storage;

	module:log("debug", "injecting storage config...");

	if type(_storage) == "string" then cm.getconfig()[mod_host].default_storage = _storage; end

	if type(_storage) == "table" then -- append

		_storage.muc_log = "internal";

	else

		cm.getconfig()[mod_host].storage = { muc_log = "internal" };

	end

	storagemanager.get_driver(mod_host, "muc_log"); -- init

end

-- Module Definitions

function log_if_needed(e)

	local stanza, origin = e.stanza, e.origin;

	if	(stanza.name == "presence") or

		(stanza.name == "iq") or

	   	(stanza.name == "message" and tostring(stanza.attr.type) == "groupchat")

	then

		local node, host = split_jid(stanza.attr.to);

		local muc = hosts[host].muc;

		if node and host then

			local bare = node .. "@" .. host;

			if muc and muc.rooms[bare] then

				local room = muc.rooms[bare]

				local today = os.date("%y%m%d");

				local now = os.date("%X")

				local muc_to = nil

				local muc_from = nil;

				local already_joined = false;

				if room._data.hidden then -- do not log any data of private rooms

					return;

				end

				if not room._data.logging then -- do not log where logging is not enabled

					return;

				end

				if stanza.name == "presence" and stanza.attr.type == nil then

					muc_from = stanza.attr.to;

					if room._occupants and room._occupants[stanza.attr.to] then

						already_joined = true;

						stanza:tag("alreadyJoined"):text("true"); 

					end

				elseif stanza.name == "iq" and stanza.attr.type == "set" then -- kick, to is the room, from is the admin, nick who is kicked is attr of iq->query->item

					if stanza.tags[1] and stanza.tags[1].name == "query" then

						local tmp = stanza.tags[1];

						if tmp.tags[1] ~= nil and tmp.tags[1].name == "item" and tmp.tags[1].attr.nick then

							tmp = tmp.tags[1];

							for jid, nick in pairs(room._jid_nick) do

								if nick == stanza.attr.to .. "/" .. tmp.attr.nick then

									muc_to = nick;

									break;

								end

							end

						end

					end

				else

					for jid, nick in pairs(room._jid_nick) do

						if jid == stanza.attr.from then

							muc_from = nick;

							break;

						end

					end

				end

				if (muc_from or muc_to) then

					local data = data_load(node, host, datastore .. "/" .. today);

					local realFrom = stanza.attr.from;

					local realTo = stanza.attr.to;

					if data == nil then

						data = {};

					end

					stanza.attr.from = muc_from;

					stanza.attr.to = muc_to;

					data[#data + 1] = "<stanza time=\"".. now .. "\">" .. tostring(stanza) .. "</stanza>\n";

					stanza.attr.from = realFrom;

					stanza.attr.to = realTo;

					if already_joined == true then

						if stanza[#stanza].name == "alreadyJoined" then  -- normaly the faked element should be the last, remove it when it is the last

							stanza[#stanza] = nil;

						else

							for i = 1, #stanza, 1 do

								if stanza[i].name == "alreadyJoined" then  -- remove the faked element

									stanza[i] = nil;

									break;

								end

							end

						end

					end

					data_store(node, host, datastore .. "/" .. today, data);

				end

			end

		end

	end

end

module:hook("message/bare", log_if_needed, 1);

if log_presences then

	module:hook("iq/bare", log_if_needed, 1);

	module:hook("presence/full", log_if_needed, 1); 

end

local function reload()

	inject_storage_config();

end

function module.load()

	inject_storage_config();

end

module:log("debug", "module mod_muc_log loaded!");