Creature/Scripting: Move CreatureAI::CanRespawn to CreatureScript::CanSpawn. Now also applies to initial spawn. Dynamic spawning prep.

src/server/game/AI/CreatureAI.h

@@ -106,9 +106,6 @@ class TC_GAME_API CreatureAI : public UnitAI
         // Trigger Creature "Alert" state (creature can see stealthed unit)
         void TriggerAlert(Unit const* who) const;
 
-        // Called in Creature::Update when deathstate = DEAD. Inherited classes may maniuplate the ability to respawn based on scripted events.
-        virtual bool CanRespawn() { return true; }
-
         // Called for reaction at stopping attack at no attackers or targets
         virtual void EnterEvadeMode(EvadeReason why = EVADE_REASON_OTHER);
 

src/server/game/AI/ScriptedAI/ScriptedCreature.cpp

@@ -507,14 +507,6 @@ void BossAI::_EnterCombat()
     ScheduleTasks();
 }
 
-bool BossAI::CanRespawn()
-{
-    if (instance && instance->GetBossState(_bossId) == DONE)
-        return false;
-
-    return true;
-}
-
 void BossAI::TeleportCheaters()
 {
     float x, y, z;

src/server/game/AI/ScriptedAI/ScriptedCreature.h

@@ -361,7 +361,6 @@ class TC_GAME_API BossAI : public ScriptedAI
         void JustReachedHome() override { _JustReachedHome(); }
 
         bool CanAIAttack(Unit const* target) const override { return CheckBoundary(target); }
-        bool CanRespawn() override;
 
     protected:
         void _Reset();

src/server/game/Entities/Creature/Creature.cpp

@@ -518,9 +518,9 @@ void Creature::Update(uint32 diff)
             time_t now = time(NULL);
             if (m_respawnTime <= now)
             {
-                bool allowed = IsAIEnabled ? AI()->CanRespawn() : true;     // First check if there are any scripts that object to us respawning
+                // First check if there are any scripts that object to us respawning
-                if (!allowed)                                               // Will be rechecked on next Update call
+                if (!sScriptMgr->CanSpawn(GetSpawnId(), GetCreatureTemplate(), GetCreatureData(), GetMap()))
-                    break;
+                    break; // Will be rechecked on next Update call
 
                 ObjectGuid dbtableHighGuid(HighGuid::Unit, GetEntry(), m_spawnId);
                 time_t linkedRespawntime = GetMap()->GetLinkedRespawnTime(dbtableHighGuid);
@@ -1388,6 +1388,11 @@ bool Creature::LoadCreatureFromDB(ObjectGuid::LowType spawnId, Map* map, bool ad
     m_deathState = ALIVE;
 
     m_respawnTime  = GetMap()->GetCreatureRespawnTime(m_spawnId);
+
+    // Is the creature script objecting to us spawning? If yes, delay by one second (then re-check in ::Update)
+    if (!m_respawnTime && !sScriptMgr->CanSpawn(spawnId, GetCreatureTemplate(), GetCreatureData(), map))
+        m_respawnTime = time(NULL)+1;
+
     if (m_respawnTime)                          // respawn on Update
     {
         m_deathState = DEAD;

src/server/game/Scripting/ScriptMgr.cpp

@@ -1602,6 +1602,14 @@ uint32 ScriptMgr::GetDialogStatus(Player* player, Creature* creature)
     return tmpscript->GetDialogStatus(player, creature);
 }
 
+bool ScriptMgr::CanSpawn(ObjectGuid::LowType spawnId, CreatureTemplate const* cTemplate, CreatureData const* cData, Map const* map)
+{
+    ASSERT(cTemplate);
+
+    GET_SCRIPT_RET(CreatureScript, cTemplate->ScriptID, tmpscript, true);
+    return tmpscript->CanSpawn(spawnId, cTemplate, cData, map);
+}
+
 CreatureAI* ScriptMgr::GetCreatureAI(Creature* creature)
 {
     ASSERT(creature);

src/server/game/Scripting/ScriptMgr.h

@@ -66,6 +66,8 @@ struct AchievementCriteriaData;
 struct AuctionEntry;
 struct ConditionSourceInfo;
 struct Condition;
+struct CreatureTemplate;
+struct CreatureData;
 struct ItemTemplate;
 struct OutdoorPvPData;
 
@@ -432,6 +434,9 @@ class TC_GAME_API CreatureScript : public UnitScript, public UpdatableScript<Cre
         // Called when the dialog status between a player and the creature is requested.
         virtual uint32 GetDialogStatus(Player* /*player*/, Creature* /*creature*/) { return DIALOG_STATUS_SCRIPTED_NO_STATUS; }
 
+        // Called when the creature tries to spawn. Return false to block spawn and re-evaluate on next tick.
+        virtual bool CanSpawn(ObjectGuid::LowType /*spawnId*/, CreatureTemplate const* /*cTemplate*/, CreatureData const* /*cData*/, Map const* /*map*/) { return true; }
+
         // Called when a CreatureAI object is needed for the creature.
         virtual CreatureAI* GetAI(Creature* /*creature*/) const { return NULL; }
 };
@@ -957,6 +962,7 @@ class TC_GAME_API ScriptMgr
         bool OnQuestSelect(Player* player, Creature* creature, Quest const* quest);
         bool OnQuestReward(Player* player, Creature* creature, Quest const* quest, uint32 opt);
         uint32 GetDialogStatus(Player* player, Creature* creature);
+        bool CanSpawn(ObjectGuid::LowType spawnId, CreatureTemplate const* cTemplate, CreatureData const* cData, Map const* map);
         CreatureAI* GetCreatureAI(Creature* creature);
         void OnCreatureUpdate(Creature* creature, uint32 diff);