local tonumber, tostring = tonumber, tostring;

local ipairs, pairs, print= ipairs, pairs, print;

local collectgarbage = collectgarbage;

local m_random = import("math", "random");

local format = import("string", "format");

local hosts = hosts;

local sessions = sessions;

local modulemanager = require "core.modulemanager";

local log = require "util.logger".init("sessionmanager");

local error = error;

local uuid_generate = require "util.uuid".uuid_generate;

local newproxy = newproxy;

local getmetatable = getmetatable;

module "sessionmanager"

function new_session(conn)

	local session = { conn = conn, notopen = true, priority = 0, type = "c2s_unauthed" };

	if true then

		session.trace = newproxy(true);

		getmetatable(session.trace).__gc = function () print("Session got collected") end;

	end

	local w = conn.write;

	session.send = function (t) w(tostring(t)); end

	return session;

end

function destroy_session(session)

	if not (session and session.disconnect) then return; end 

	log("debug", "Destroying session...");

	session.disconnect();

	if session.username then

		if session.resource then

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

		end

		local nomore = true;

		for res, ssn in pairs(hosts[session.host].sessions[session.username]) do

			nomore = false;

		end

		if nomore then

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

		end

	end

	session.conn = nil;

	session.disconnect = nil;

	for k in pairs(session) do

		if k ~= "trace" then

			session[k] = nil;

		end

	end

	collectgarbage("collect");

	collectgarbage("collect");

	collectgarbage("collect");

	collectgarbage("collect");

	collectgarbage("collect");

end

function send_to_session(session, data)

	log("debug", "Sending: %s", tostring(data));

	session.conn.write(tostring(data));

end

function make_authenticated(session, username)

	session.username = username;

	if session.type == "c2s_unauthed" then

		session.type = "c2s";

	end

	return true;

end

function bind_resource(session, resource)

	if not session.username then return false, "auth"; end

	if session.resource then return false, "constraint"; end -- We don't support binding multiple resources

	resource = resource or uuid_generate();

	--FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing

	if not hosts[session.host].sessions[session.username] then

		hosts[session.host].sessions[session.username] = { sessions = {} };

	else

		if hosts[session.host].sessions[session.username].sessions[resource] then

			-- Resource conflict

			return false, "conflict";

		end

	end

	session.resource = resource;

	session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;

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

	return true;

end

function streamopened(session, attr)

						local send = session.send;

						session.host = attr.to or error("Client failed to specify destination hostname");

			                        session.version = tonumber(attr.version) or 0;

			                        session.streamid = m_random(1000000, 99999999);

			                        print(session, session.host, "Client opened stream");

			                        send("<?xml version='1.0'?>");

			                        send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0'>", session.streamid, session.host));

						local features = {};

						modulemanager.fire_event("stream-features", session, features);

						send("<stream:features>");

						for _, feature in ipairs(features) do

							send_to_session(session, tostring(feature));

						end

        			                send("</stream:features>");

						log("info", "Stream opened successfully");

						session.notopen = nil;

end

return _M;