Core/Spells: Fix orientation- and targeting-related issues if the creature isn't currently engaged in combat. (#17120)

Also disable spell focus system for vehicle control auras.

Closes #16572
Closes #17016

7 files changed, 55 insertions, 62 deletions

diff --git a/src/server/game/Entities/Creature/Creature.cpp b/src/server/game/Entities/Creature/Creature.cpp
index b556fde1705..c4a2e193be9 100644
--- a/src/server/game/Entities/Creature/Creature.cpp
+++ b/src/server/game/Entities/Creature/Creature.cpp
@@ -183,7 +183,7 @@ m_lootRecipient(), m_lootRecipientGroup(0), _skinner(), _pickpocketLootRestore(0
 m_respawnDelay(300), m_corpseDelay(60), m_respawnradius(0.0f), m_boundaryCheckTime(2500), m_combatPulseTime(0), m_combatPulseDelay(0), m_reactState(REACT_AGGRESSIVE),
 m_defaultMovementType(IDLE_MOTION_TYPE), m_spawnId(0), m_equipmentId(0), m_originalEquipmentId(0), m_AlreadyCallAssistance(false),
 m_AlreadySearchedAssistance(false), m_regenHealth(true), m_cannotReachTarget(false), m_cannotReachTimer(0), m_AI_locked(false), m_meleeDamageSchoolMask(SPELL_SCHOOL_MASK_NORMAL),
-m_originalEntry(0), m_homePosition(), m_transportHomePosition(), m_creatureInfo(nullptr), m_creatureData(nullptr), m_waypointID(0), m_path_id(0), m_formation(nullptr), m_focusSpell(nullptr), m_focusDelay(0)
+m_originalEntry(0), m_homePosition(), m_transportHomePosition(), m_creatureInfo(nullptr), m_creatureData(nullptr), m_waypointID(0), m_path_id(0), m_formation(nullptr), m_focusSpell(nullptr), m_focusDelay(0), m_shouldReacquireTarget(false), m_suppressedOrientation(0.0f)
 {
     m_regenTimer = CREATURE_REGEN_INTERVAL;
     m_valuesCount = UNIT_END;
@@ -571,6 +571,19 @@ void Creature::Update(uint32 diff)
             if (!IsAlive())
                 break;
 
+            if (m_shouldReacquireTarget && !IsFocusing(nullptr, true))
+            {
+                SetTarget(m_suppressedTarget);
+                if (m_suppressedTarget)
+                {
+                    if (WorldObject const* objTarget = ObjectAccessor::GetWorldObject(*this, m_suppressedTarget))
+                        SetFacingToObject(objTarget);
+                }
+                else
+                    SetFacingTo(m_suppressedOrientation);
+                m_shouldReacquireTarget = false;
+            }
+
             // if creature is charmed, switch to charmed AI (and back)
             if (NeedChangeAI)
             {
@@ -2781,31 +2794,39 @@ void Creature::SetDisplayId(uint32 modelId)
 
 void Creature::SetTarget(ObjectGuid guid)
 {
-    if (!IsFocusing())
+    if (IsFocusing(nullptr, true))
+        m_suppressedTarget = guid;
+    else
         SetGuidValue(UNIT_FIELD_TARGET, guid);
 }
 
-bool Creature::FocusTarget(Spell const* focusSpell, WorldObject const* target)
+void Creature::FocusTarget(Spell const* focusSpell, WorldObject const* target)
 {
     // already focused
     if (m_focusSpell)
-        return false;
+        return;
+
+    // don't use spell focus for vehicle spells
+    if (focusSpell->GetSpellInfo()->HasAura(SPELL_AURA_CONTROL_VEHICLE))
+        return;
 
     if ((!target || target == this) && !focusSpell->GetCastTime()) // instant cast, untargeted (or self-targeted) spell doesn't need any facing updates
-        return false;
+        return;
 
-    m_focusSpell = focusSpell;
+    // store pre-cast values for target and orientation (used to later restore)
+    if (!IsFocusing(nullptr, true))
+    { // only overwrite these fields if we aren't transitioning from one spell focus to another
+        m_suppressedTarget = GetGuidValue(UNIT_FIELD_TARGET);
+        m_suppressedOrientation = GetOrientation();
+    }
 
-    // "instant" creature casts that require re-targeting will be delayed by a short moment to prevent facing bugs
-    bool shouldDelay = false;
+    m_focusSpell = focusSpell;
 
     // set target, then force send update packet to players if it changed to provide appropriate facing
     ObjectGuid newTarget = target ? target->GetGUID() : ObjectGuid::Empty;
     if (GetGuidValue(UNIT_FIELD_TARGET) != newTarget)
     {
         SetGuidValue(UNIT_FIELD_TARGET, newTarget);
-        if (target)
-            SetFacingToObject(target);
 
         if ( // here we determine if the (relatively expensive) forced update is worth it, or whether we can afford to wait until the scheduled update tick
             ( // only require instant update for spells that actually have a visual
@@ -2823,28 +2844,21 @@ bool Creature::FocusTarget(Spell const* focusSpell, WorldObject const* target)
             {
                 // only update players that are known to the client (have already been created)
                 if (player->HaveAtClient(this))
-                {
                     SendUpdateToPlayer(player);
-                    shouldDelay = true;
-                }
             }
-            if (shouldDelay)
-                shouldDelay = !(focusSpell->IsTriggered() || focusSpell->GetCastTime() || focusSpell->GetSpellInfo()->IsChanneled());
         }
     }
 
     bool canTurnDuringCast = !focusSpell->GetSpellInfo()->HasAttribute(SPELL_ATTR5_DONT_TURN_DURING_CAST);
     // Face the target - we need to do this before the unit state is modified for no-turn spells
     if (target)
-        SetInFront(target);
+        SetFacingTo(GetAngle(target));
     else if (!canTurnDuringCast)
         if (Unit* victim = GetVictim())
-            SetInFront(victim); // ensure server-side orientation is correct at beginning of cast
+            SetFacingTo(GetAngle(victim)); // ensure orientation is correct at beginning of cast
 
     if (!canTurnDuringCast)
         AddUnitState(UNIT_STATE_CANNOT_TURN);
-
-    return shouldDelay;
 }
 
 bool Creature::IsFocusing(Spell const* focusSpell, bool withDelay)
@@ -2882,9 +2896,18 @@ void Creature::ReleaseFocus(Spell const* focusSpell, bool withDelay)
         return;
 
     if (IsPet()) // player pets do not use delay system
-        SetGuidValue(UNIT_FIELD_TARGET, GetVictim() ? EnsureVictim()->GetGUID() : ObjectGuid::Empty);
+    {
+        SetGuidValue(UNIT_FIELD_TARGET, m_suppressedTarget);
+        if (m_suppressedTarget)
+        {
+            if (WorldObject const* objTarget = ObjectAccessor::GetWorldObject(*this, m_suppressedTarget))
+                SetFacingTo(GetAngle(objTarget));
+        }
+        else
+            SetFacingTo(m_suppressedOrientation);
+    }
     else
-        // tell the creature that it should reacquire its actual target after the delay expires (this is handled in ::Attack)
+        // tell the creature that it should reacquire its actual target after the delay expires (this is handled in ::Update)
         // player pets don't need to do this, as they automatically reacquire their target on focus release
         MustReacquireTarget();
 
diff --git a/src/server/game/Entities/Creature/Creature.h b/src/server/game/Entities/Creature/Creature.h
index 57a025fdd88..029dd1eb77b 100644
--- a/src/server/game/Entities/Creature/Creature.h
+++ b/src/server/game/Entities/Creature/Creature.h
@@ -689,7 +689,8 @@ class TC_GAME_API Creature : public Unit, public GridObject<Creature>, public Ma
 
         // Handling caster facing during spellcast
         void SetTarget(ObjectGuid guid) override;
-        bool FocusTarget(Spell const* focusSpell, WorldObject const* target);
+        void MustReacquireTarget() { m_shouldReacquireTarget = true; } // flags the Creature for forced (client displayed) target reacquisition in the next ::Update call
+        void FocusTarget(Spell const* focusSpell, WorldObject const* target);
         bool IsFocusing(Spell const* focusSpell = nullptr, bool withDelay = false);
         void ReleaseFocus(Spell const* focusSpell = nullptr, bool withDelay = true);
 
@@ -765,8 +766,12 @@ class TC_GAME_API Creature : public Unit, public GridObject<Creature>, public Ma
         CreatureGroup* m_formation;
         bool m_TriggerJustRespawned;
 
-        Spell const* m_focusSpell;   ///> Locks the target during spell cast for proper facing
+        /* Spell focus system */
+        Spell const* m_focusSpell;   // Locks the target during spell cast for proper facing
         uint32 m_focusDelay;
+        bool m_shouldReacquireTarget;
+        ObjectGuid m_suppressedTarget; // Stores the creature's "real" target while casting
+        float m_suppressedOrientation; // Stores the creature's "real" orientation while casting
 
         CreatureTextRepeatGroup m_textRepeat;
 };
diff --git a/src/server/game/Entities/Unit/Unit.cpp b/src/server/game/Entities/Unit/Unit.cpp
index 339b2e9b71f..7b066f57def 100644
--- a/src/server/game/Entities/Unit/Unit.cpp
+++ b/src/server/game/Entities/Unit/Unit.cpp
@@ -247,7 +247,6 @@ Unit::Unit(bool isWorldObject) :
         m_createStats[i] = 0.0f;
 
     m_attacking = nullptr;
-    m_shouldReacquireTarget = false;
     m_modMeleeHitChance = 0.0f;
     m_modRangedHitChance = 0.0f;
     m_modSpellHitChance = 0.0f;
@@ -8558,12 +8557,6 @@ bool Unit::Attack(Unit* victim, bool meleeAttack)
     if (HasAuraType(SPELL_AURA_MOD_UNATTACKABLE))
         RemoveAurasByType(SPELL_AURA_MOD_UNATTACKABLE);
 
-    if (m_shouldReacquireTarget)
-    {
-        SetTarget(victim->GetGUID());
-        m_shouldReacquireTarget = false;
-    }
-
     if (m_attacking)
     {
         if (m_attacking == victim)
diff --git a/src/server/game/Entities/Unit/Unit.h b/src/server/game/Entities/Unit/Unit.h
index 8441252bef6..61b7665254b 100644
--- a/src/server/game/Entities/Unit/Unit.h
+++ b/src/server/game/Entities/Unit/Unit.h
@@ -1300,7 +1300,6 @@ class TC_GAME_API Unit : public WorldObject
         void _removeAttacker(Unit* pAttacker);               // must be called only from Unit::AttackStop()
         Unit* getAttackerForHelper() const;                 // If someone wants to help, who to give them
         bool Attack(Unit* victim, bool meleeAttack);
-        void MustReacquireTarget() { m_shouldReacquireTarget = true; } // flags the Unit for forced (client displayed) target reacquisition in the next ::Attack call
         void CastStop(uint32 except_spellid = 0);
         bool AttackStop();
         void RemoveAllAttackers();
@@ -2203,7 +2202,6 @@ class TC_GAME_API Unit : public WorldObject
 
         AttackerSet m_attackers;
         Unit* m_attacking;
-        bool m_shouldReacquireTarget;
 
         DeathState m_deathState;
 
diff --git a/src/server/game/Spells/Spell.cpp b/src/server/game/Spells/Spell.cpp
index 9545b957c57..45dcb6d9d17 100644
--- a/src/server/game/Spells/Spell.cpp
+++ b/src/server/game/Spells/Spell.cpp
@@ -603,8 +603,6 @@ m_caster((info->HasAttribute(SPELL_ATTR6_CAST_BY_CHARMER) && caster->GetCharmerO
     //Auto Shot & Shoot (wand)
     m_autoRepeat = m_spellInfo->IsAutoRepeatRangedSpell();
 
-    m_isDelayedInstantCast = false;
-
     m_runesState = 0;
     m_powerCost = 0;                                        // setup to correct value in Spell::prepare, must not be used before.
     m_casttime = 0;                                         // setup to correct value in Spell::prepare, must not be used before.
@@ -2977,21 +2975,9 @@ void Spell::prepare(SpellCastTargets const* targets, AuraEffect const* triggered
         if (!(IsNextMeleeSwingSpell() || IsAutoRepeat() || _triggeredCastFlags & TRIGGERED_IGNORE_SET_FACING))
         {
             if (m_targets.GetObjectTarget() && m_caster != m_targets.GetObjectTarget())
-            {
-                if (m_caster->ToCreature()->FocusTarget(this, m_targets.GetObjectTarget()))
-                {
-                    m_isDelayedInstantCast = true;
-                    m_timer = 100; // 100ms delay ensures client has updated creature orientation when cast goes off
-                }
-            }
+                m_caster->ToCreature()->FocusTarget(this, m_targets.GetObjectTarget());
             else if (m_spellInfo->HasAttribute(SPELL_ATTR5_DONT_TURN_DURING_CAST))
-            {
-                if (m_caster->ToCreature()->FocusTarget(this, nullptr))
-                {
-                    m_isDelayedInstantCast = true;
-                    m_timer = 100;
-                }
-            }
+                m_caster->ToCreature()->FocusTarget(this, nullptr);
         }
 
     // don't allow channeled spells / spells with cast time to be cast while moving
@@ -3034,14 +3020,13 @@ void Spell::prepare(SpellCastTargets const* targets, AuraEffect const* triggered
         }
 
         m_caster->SetCurrentCastSpell(this);
-        if (!m_isDelayedInstantCast)
-            SendSpellStart();
+        SendSpellStart();
 
         if (!(_triggeredCastFlags & TRIGGERED_IGNORE_GCD))
             TriggerGlobalCooldown();
 
         //item: first cast may destroy item and second cast causes crash
-        if (!m_casttime && !m_isDelayedInstantCast && !m_spellInfo->StartRecoveryTime && !m_castItemGUID && GetCurrentContainer() == CURRENT_GENERIC_SPELL)
+        if (!m_casttime && !m_spellInfo->StartRecoveryTime && !m_castItemGUID && GetCurrentContainer() == CURRENT_GENERIC_SPELL)
             cast(true);
     }
 }
@@ -3050,9 +3035,6 @@ void Spell::cancel()
 {
     if (m_spellState == SPELL_STATE_FINISHED)
         return;
-    // delayed instant casts are used for client-side visual orientation; they are treated as instant for all intents and purposes server-side, and thus cannot be interrupted by another cast
-    if (m_isDelayedInstantCast)
-        return;
 
     uint32 oldState = m_spellState;
     m_spellState = SPELL_STATE_FINISHED;
@@ -3122,9 +3104,6 @@ void Spell::cast(bool skipCheck)
         return;
     }
 
-    if (m_isDelayedInstantCast)
-        SendSpellStart();
-
     if (Player* playerCaster = m_caster->ToPlayer())
     {
         // now that we've done the basic check, now run the scripts
@@ -3209,10 +3188,7 @@ void Spell::cast(bool skipCheck)
     if (m_caster->GetTypeId() == TYPEID_UNIT && !m_caster->HasFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_PLAYER_CONTROLLED))
         if (!m_spellInfo->HasAttribute(SPELL_ATTR5_DONT_TURN_DURING_CAST))
             if (WorldObject* objTarget = m_targets.GetObjectTarget())
-            {
                 m_caster->SetInFront(objTarget);
-                m_caster->SetFacingToObject(objTarget);
-            }
 
     SelectSpellTargets();
 
diff --git a/src/server/game/Spells/Spell.h b/src/server/game/Spells/Spell.h
index c834d187720..016af275141 100644
--- a/src/server/game/Spells/Spell.h
+++ b/src/server/game/Spells/Spell.h
@@ -527,7 +527,6 @@ class TC_GAME_API Spell
         int32 m_channeledDuration;                          // Calculated channeled spell duration in order to calculate correct pushback.
         bool m_canReflect;                                  // can reflect this spell?
         bool m_autoRepeat;
-        bool m_isDelayedInstantCast;                        // whether this is a creature's delayed instant cast
         uint8 m_runesState;
 
         uint8 m_delayAtDamageCount;
diff --git a/src/server/scripts/Northrend/zone_dalaran.cpp b/src/server/scripts/Northrend/zone_dalaran.cpp
index 03af1a6417f..ac05c421efb 100644
--- a/src/server/scripts/Northrend/zone_dalaran.cpp
+++ b/src/server/scripts/Northrend/zone_dalaran.cpp
@@ -115,7 +115,6 @@ public:
                     }
                     break;
             }
-            me->SetOrientation(me->GetHomePosition().GetOrientation());
             return;
         }