[Client] Send ActorAI packets when followed by an NPC

The packet is sent regardless of whether we are the cell authority or not, so the server can decide what it wants to do with it.

apps/openmw/mwscript/aiextensions.cpp

@@ -3,6 +3,20 @@
 #include <stdexcept>
 #include <iostream>
 
+/*
+    Start of tes3mp addition
+
+    Include additional headers for multiplayer purposes
+*/
+#include <components/openmw-mp/Log.hpp>
+#include "../mwmp/Main.hpp"
+#include "../mwmp/Networking.hpp"
+#include "../mwmp/ActorList.hpp"
+#include "../mwmp/MechanicsHelper.hpp"
+/*
+    End of tes3mp addition
+*/
+
 #include <components/compiler/extensions.hpp>
 #include <components/compiler/opcodes.hpp>
 
@@ -318,6 +332,47 @@ namespace MWScript
 
                     std::cout << "AiFollow: " << actorID << ", " << x << ", " << y << ", " << z << ", " << duration
                         << std::endl;
+
+                    /*
+                        Start of tes3mp addition
+
+                        Send ActorAI packets when an actor follows us, regardless of whether we're the cell
+                        authority or not; the server can decide if it wants to comply with them by forwarding
+                        them to the cell authority
+                    */
+                    MWWorld::Ptr targetPtr = MWBase::Environment::get().getWorld()->searchPtr(actorID, true);
+
+                    if (targetPtr)
+                    {
+                        mwmp::BaseActor baseActor;
+                        baseActor.refNumIndex = ptr.getCellRef().getRefNum().mIndex;
+                        baseActor.mpNum = ptr.getCellRef().getMpNum();
+                        baseActor.aiAction = mwmp::BaseActorList::FOLLOW;
+                        baseActor.aiTarget = MechanicsHelper::getTarget(targetPtr);
+
+                        LOG_MESSAGE_SIMPLE(Log::LOG_INFO, "Sending ID_ACTOR_AI about %s %i-%i to server",
+                            ptr.getCellRef().getRefId(), baseActor.refNumIndex, baseActor.mpNum);
+
+                        if (baseActor.aiTarget.isPlayer)
+                        {
+                            LOG_MESSAGE_SIMPLE(Log::LOG_INFO, "- Following player %s",
+                                targetPtr.getClass().getName(targetPtr).c_str());
+                        }
+                        else
+                        {
+                            LOG_MESSAGE_SIMPLE(Log::LOG_INFO, "- Following actor %s %i-%i",
+                                targetPtr.getCellRef().getRefId(), baseActor.aiTarget.refNumIndex, baseActor.aiTarget.mpNum);
+                        }
+
+                        mwmp::ActorList *actorList = mwmp::Main::get().getNetworking()->getActorList();
+                        actorList->reset();
+                        actorList->cell = *ptr.getCell()->getCell();
+                        actorList->addAiActor(baseActor);
+                        actorList->sendAiActors();
+                    }
+                    /*
+                        End of tes3mp addition
+                    */
                 }
         };