local logger = require "logger";

local lxp = require "lxp"

local init_xmlhandlers = require "core.xmlhandlers"

local sm_new_session = require "core.sessionmanager".new_session;

local s2s_new_incoming = require "core.s2smanager".new_incoming;

local s2s_streamopened = require "core.s2smanager".streamopened;

local s2s_destroy_session = require "core.s2smanager".destroy_session;

local stream_callbacks = { streamopened = s2s_streamopened, streamclosed = s2s_streamclosed };

local connlisteners_register = require "net.connlisteners".register;

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 sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session; --import("core.sessionmanager", "new_session", "destroy_session");

local st = stanza;

local sessions = {};

local xmppserver = { default_port = 5269 };

-- These are session methods --

local function session_reset_stream(session)

	-- Reset stream

		local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");

		session.parser = parser;

		session.notopen = true;

		function session.data(conn, data)

			parser:parse(data);

		end

		return true;

end

local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};

local function session_close(session, reason)

	local log = session.log or log;

	if session.conn then

		if reason then

			if type(reason) == "string" then -- assume stream error

				log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);

				session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));

			elseif type(reason) == "table" then

				if reason.condition then

					local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();

					if reason.text then

						stanza:tag("text", stream_xmlns_attr):text(reason.text):up();

					end

					if reason.extra then

						stanza:add_child(reason.extra);

					end

					log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));

					session.sends2s(stanza);

				elseif reason.name then -- a stanza

					log("info", "Disconnecting %s->%s[%s], <stream:error> is: %s", session.from_host or "(unknown host)", session.to_host or "(unknown host)", session.type, tostring(reason));

					session.sends2s(reason);

				end

			end

		end

		session.sends2s("</stream:stream>");

		session.conn.close();

		xmppserver.disconnect(session.conn, "stream error");

	end

end

-- End of session methods --

function xmppserver.listener(conn, data)

	local session = sessions[conn];

	if not session then

		session = s2s_new_incoming(conn);

		sessions[conn] = session;

		-- Logging functions --

		local mainlog, log = log;

		do

			local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");

			log = logger.init(conn_name);

		end

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

		session.log = log;

		print("Incoming s2s connection");

		session.reset_stream = session_reset_stream;

		session.close = session_close;

		session_reset_stream(session); -- Initialise, ready for use

		-- FIXME: Below function should be session,stanza - and xmlhandlers should use :method() notation to call,

		-- this will avoid the useless indirection we have atm

		-- (I'm on a mission, no time to fix now)

		-- Debug version --

		local function handleerr(err) print("Traceback:", err, debug.traceback()); end

		session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end

	end

	if data then

		session.data(conn, data);

	end

end

function xmppserver.disconnect(conn)

	local session = sessions[conn];

	if session then

		s2s_destroy_session(session);

		sessions[conn]  = nil;

		session = nil;

		collectgarbage("collect");

	end

end

function xmppserver.register_outgoing(conn, session)

	session.direction = "outgoing";

	sessions[conn] = session;

	session.reset_stream = session_reset_stream;	

	session_reset_stream(session); -- Initialise, ready for use

	-- FIXME: Below function should be session,stanza - and xmlhandlers should use :method() notation to call,

	-- this will avoid the useless indirection we have atm

	-- (I'm on a mission, no time to fix now)

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

end

connlisteners_register("xmppserver", xmppserver);

-- We need to perform some initialisation when a connection is created

-- We also need to perform that same initialisation at other points (SASL, TLS, ...)

-- ...and we need to handle data

-- ...and record all sessions associated with connections