require "luarocks.require"

server = require "net.server"

require "socket"

require "ssl"

require "lxp"

function log(type, area, message)

	print(type, area, message);

end

require "core.stanza_dispatch"

require "core.xmlhandlers"

require "core.rostermanager"

require "core.offlinemessage"

require "core.modulemanager"

require "core.usermanager"

require "core.sessionmanager"

require "core.stanza_router"

require "util.stanza"

require "util.jid"

-- Locals for faster access --

local t_insert = table.insert;

local t_concat = table.concat;

local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end

local m_random = math.random;

local format = string.format;

local st = stanza;

local init_xmlhandlers = xmlhandlers.init_xmlhandlers;

------------------------------

local hosts, users = hosts, users;

function connect_host(host)

	hosts[host] = { type = "remote", sendbuffer = {} };

end

local function route_stanza(stanza)

	if not stanza.attr.to then

		-- Has no 'to' attribute, handle internally

	end

	local node, host, resource = jid.split(stanza.attr.to);

	if host and hosts[host] and hosts[host].type == "local" then

			-- Is a local host, handle internally

	else

		-- Is not for us or a local user, route accordingly

	end

end

local function send_to(session, to, stanza)

	local node, host, resource = jid.split(to);

	if not hosts[host] then

		-- s2s

	elseif hosts[host].type == "local" then

		print("   ...is to a local user")

		local destuser = hosts[host].sessions[node];

		if destuser and destuser.sessions then

			if not destuser.sessions[resource] then

				local best_session;

				for resource, session in pairs(destuser.sessions) do

					if not best_session then best_session = session;

					elseif session.priority >= best_session.priority and session.priority >= 0 then

						best_session = session;

					end

				end

				if not best_session then

					offlinemessage.new(node, host, stanza);

				else

					print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");

					resource = best_session.resource;

				end

			end

			if destuser.sessions[resource] == session then

				log("warn", "core", "Attempt to send stanza to self, dropping...");

			else

				print("...sending...", tostring(stanza));

				--destuser.sessions[resource].conn.write(tostring(data));

				print("   to conn ", destuser.sessions[resource].conn);

				destuser.sessions[resource].conn.write(tostring(stanza));

				print("...sent")

			end

		elseif stanza.name == "message" then

			print("   ...will be stored offline");

			offlinemessage.new(node, host, stanza);

		elseif stanza.name == "iq" then

			print("   ...is an iq");

			session.send(st.reply(stanza)

				:tag("error", { type = "cancel" })

					:tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" }));

		end

		print("   ...done routing");

	end

end

function handler(conn, data, err)

	local session = sessions[conn];

	if not session then

		sessions[conn] = sessionmanager.new_session(conn);

		session = sessions[conn];

		-- Logging functions --

		local mainlog, log = log;

		do

			local conn_name = tostring(conn):match("%w+$");

			log = function (type, area, message) mainlog(type, conn_name, message); end

			--log = function () end

		end

		local print = function (...) log("info", "core", t_concatall({...}, "\t")); end

		session.log = log;

		print("Client connected");

		session.stanza_dispatch = function (stanza) return core_process_stanza(session, stanza); end

		session.xml_handlers = init_xmlhandlers(session);

		session.parser = lxp.new(session.xml_handlers, ":");

		function session.disconnect(err)

			if session.last_presence and session.last_presence.attr.type ~= "unavailable" then

				local pres = st.presence{ type = "unavailable" };

				if err == "closed" then err = "connection closed"; end

				pres:tag("status"):text("Disconnected: "..err);

				session.stanza_dispatch(pres);

			end

			if session.username then

				hosts[session.host].sessions[session.username] = nil;

			end

			session = nil;

			print("Disconnected: "..err);

			collectgarbage("collect");

		end

	end

	if data then

		session.parser:parse(data);

	end

	--log("info", "core", "Client disconnected, connection closed");

end

function disconnect(conn, err)

	sessions[conn].disconnect(err);

	sessions[conn] = nil;

end

modulemanager.loadall();

setmetatable(_G, { __index = function (t, k) print("WARNING: ATTEMPT TO READ A NIL GLOBAL!!!", k); error("Attempt to read a non-existent global. Naughty boy.", 2); end, __newindex = function (t, k, v) print("ATTEMPT TO SET A GLOBAL!!!!", tostring(k).." = "..tostring(v)); error("Attempt to set a global. Naughty boy.", 2); end }) --]][][[]][];

local protected_handler = function (conn, data, err) local success, ret = pcall(handler, conn, data, err); if not success then print("ERROR on "..tostring(conn)..": "..ret); conn:close(); end end;

local protected_disconnect = function (conn, err) local success, ret = pcall(disconnect, conn, err); if not success then print("ERROR on "..tostring(conn).." disconnect: "..ret); conn:close(); end end;

server.add( { listener = protected_handler, disconnect = protected_disconnect }, 5222, "*", 1, nil ) -- server.add will send a status message

server.add( { listener = protected_handler, disconnect = protected_disconnect }, 5223, "*", 1, ssl_ctx ) -- server.add will send a status message

server.loop();