PetAI: Add basic conditions some autocasted spells

Author: deiteris

src/game/AI/BaseAI/PetAI.cpp

@@ -290,8 +290,8 @@ std::pair<Unit*, Spell*> PetAI::PickSpellWithTarget(Unit* owner, Unit* victim, C
 
         // Try to cast a spell on self if the spell allows only targeting self (like Lesser Invisibility and Blood Pact)
         if (IsOnlySelfTargeting(spellInfo)) {
-            // Skip the spell in case it's already applied to self
-            if (!spell->CanAutoCast(m_unit))
+            // Skip the spell in case it's already applied to self or doesn't meet specific conditions
+            if (!ShouldSelfCast(spellInfo, victim) || !spell->CanAutoCast(m_unit))
             {
                 delete spell;
                 continue;
@@ -327,6 +327,24 @@ std::pair<Unit*, Spell*> PetAI::PickSpellWithTarget(Unit* owner, Unit* victim, C
     return { nullptr, nullptr };
 }
 
+bool PetAI::ShouldSelfCast(SpellEntry const* spellInfo, Unit* victim)
+{
+    switch (spellInfo->Id) {
+        case 23145: // Dive Rank 1-3
+        case 23147:
+        case 23148:
+        case 23099: // Dash Rank 1-3
+        case 23109:
+        case 23110:
+            // Cast only when there is a victim and it is not within melee range
+            return victim && !m_unit->CanReachWithMeleeAttack(victim);
+        case 26064: // Shell Shield Rank 1
+            // Cast only in combat and when HP is lower than 50%
+            return m_inCombat && m_unit->GetHealthPercent() < 50;
+    }
+    return true;
+}
+
 Player* PetAI::PickGroupMemberForSpell(Player* player, Spell* spell)
 {
     Group* group = player->GetGroup();

src/game/AI/BaseAI/PetAI.h

@@ -50,6 +50,7 @@ class PetAI : public CreatureAI
         Player* PickGroupMemberForSpell(Player* player, Spell* spell);
         std::pair<Unit*, Spell*> PickSpellWithTarget(Unit* owner, Unit* victim, CharmInfo* charminfo);
         void Cast(std::pair<Unit*, Spell*> spellWithTarget);
+        bool ShouldSelfCast(SpellEntry const* spellInfo, Unit* victim);
 
         bool m_inCombat;