Smuxi.Engine.XmppProtocolManager.PrintPrivateChatPresence C# (CSharp) Метод

        void PrintPrivateChatPresence(XmppPersonModel person, Presence pres)
        {
            Jid jid = pres.From;
            XmppResourceModel resource;
            if (person.Resources.TryGetValue(jid.Resource??"", out resource)) {
                if (resource.Presence.Show == pres.Show
                    && resource.Presence.Status == pres.Status
                    && resource.Presence.Last == pres.Last
                    && resource.Presence.XDelay == pres.XDelay
                    && resource.Presence.Priority == pres.Priority
                    && resource.Presence.Type == pres.Type
                    ) {
                    // presence didn't change enough to warrent a display message -> abort
                    return;
                }
            }
            MessageModel msg = CreatePresenceUpdateMessage(jid, person, pres);
            if (!String.IsNullOrEmpty(jid.Resource)) {
                var directchat = Session.GetChat(jid, ChatType.Person, this);
                if (directchat != null) {
                    // in case of direct chat we still send this message
                    Session.AddMessageToChat(directchat, msg);
                }
            }
            // a nonexisting resource going offline?
            if (pres.Type == PresenceType.unavailable) {
                if (!person.Resources.ContainsKey(jid.Resource??"")) {
                    return;
                }
            }
            var res = person.GetOrCreateResource(jid);
            var oldpres = res.Presence;
            res.Presence = pres;
            // highest pres
            Jid hjid = jid;
            Jid nextjid = jid;
            // 2nd highest pres
            Presence hpres = pres;
            Presence nextpres = null;
            bool amHighest = true;
            bool wasHighest = true;
            foreach (var pair in person.Resources) {
                if (pair.Value == res) continue;
                if (nextpres == null || pair.Value.Presence.Priority > nextpres.Priority) {
                    nextjid.Resource = pair.Key;
                    nextpres = pair.Value.Presence;
                }
                if (pair.Value.Presence.Priority > hpres.Priority) {
                    // someone has a higher priority than I do
                    // print the status of that resource
                    hjid.Resource = pair.Key;
                    hpres = pair.Value.Presence;
                    amHighest = false;
                }
                if (oldpres != null && pair.Value.Presence.Priority > oldpres.Priority) {
                    wasHighest = false;
                }
            }
            if (pres.Type == PresenceType.available) {
                // wasn't and isn't highiest prio -> ignore
                if (!wasHighest && !amHighest) return;
                // just another below zero prio -> ignore
                if (amHighest && pres.Priority < 0) return;
                // was highest, isn't anymore -> show presence of new highest
                if (wasHighest && !amHighest) {
                    msg = CreatePresenceUpdateMessage(hjid, person, hpres);
                }
            } else if (pres.Type == PresenceType.unavailable) {
                // still a resource left with positive priority
                if (nextpres != null && nextpres.Priority >= 0) {
                    msg = CreatePresenceUpdateMessage(nextjid, person, nextpres);
                }
            }
            var chat = Session.GetChat(jid.Bare, ChatType.Person, this);
            if (chat != null) {
                Session.AddMessageToChat(chat, msg);
            }
            if (ContactChat != null) {
                Session.AddMessageToChat(ContactChat, msg);
            }
        }