Scripts/The Underbog: Added spawn groups for bosses and implemented boss state tracking

(cherry picked from commit e3ac84b929)

src/server/scripts/Outland/CoilfangReservoir/TheUnderbog/boss_hungarfen.cpp

@@ -39,19 +39,20 @@ enum HungarfenSpells
     SPELL_GROW                       = 31698
 };
 
-struct boss_hungarfen : public ScriptedAI
+struct boss_hungarfen : public BossAI
 {
-    boss_hungarfen(Creature* creature) : ScriptedAI(creature), _roared(false) { }
+    boss_hungarfen(Creature* creature) : BossAI(creature, DATA_HUNGARFEN), _roared(false) { }
 
     void Reset() override
     {
-        _scheduler.CancelAll();
+        BossAI::Reset();
         _roared = false;
         me->SetReactState(REACT_AGGRESSIVE);
     }
 
-    void JustEngagedWith(Unit* /*who*/) override
+    void JustEngagedWith(Unit* who) override
     {
+        BossAI::JustEngagedWith(who);
         _scheduler.Schedule(IsHeroic() ? 2500ms : 5s, [this](TaskContext task)
         {
             /// @todo cast here SPELL_PUTRID_MUSHROOM_PRIMER and do it in spell script
@@ -74,12 +75,13 @@ struct boss_hungarfen : public ScriptedAI
     void EnterEvadeMode(EvadeReason why) override
     {
         DoCastSelf(SPELL_DESPAWN_UNDERBOG_MUSHROOMS, true);
-        ScriptedAI::EnterEvadeMode(why);
+        BossAI::EnterEvadeMode(why);
     }
 
-    void JustDied(Unit* /*killer*/) override
+    void JustDied(Unit* killer) override
     {
         DoCastSelf(SPELL_DESPAWN_UNDERBOG_MUSHROOMS, true);
+        BossAI::JustDied(killer);
     }
 
     void UpdateAI(uint32 diff) override

src/server/scripts/Outland/CoilfangReservoir/TheUnderbog/boss_the_black_stalker.cpp

@@ -61,18 +61,13 @@ enum Events
     EVENT_SUMMON_SPORE_STRIDER
 };
 
-struct boss_the_black_stalker : public ScriptedAI
+struct boss_the_black_stalker : public BossAI
 {
-    boss_the_black_stalker(Creature* creature) : ScriptedAI(creature), _summons(creature) { }
+    boss_the_black_stalker(Creature* creature) : BossAI(creature, DATA_THE_BLACK_STALKER), _summons(creature) { }
 
-    void Reset() override
-    {
-        _events.Reset();
-        _summons.DespawnAll();
-    }
-
-    void JustEngagedWith(Unit* /*who*/) override
+    void JustEngagedWith(Unit* who) override
     {
+        BossAI::JustEngagedWith(who);
         _events.ScheduleEvent(EVENT_LEASH_CHECK, 5s);
         _events.ScheduleEvent(EVENT_LEVITATE, 8s, 18s);
         _events.ScheduleEvent(EVENT_CHAIN_LIGHTNING, 0s, 3s);
@@ -81,19 +76,6 @@ struct boss_the_black_stalker : public ScriptedAI
             _events.ScheduleEvent(EVENT_SUMMON_SPORE_STRIDER, 20s, 30s);
     }
 
-    void JustSummoned(Creature* summon) override
-    {
-        _summons.Summon(summon);
-
-        if (me->IsEngaged())
-            DoZoneInCombat(summon);
-    }
-
-    void JustDied(Unit* /*killer*/) override
-    {
-        _summons.DespawnAll();
-    }
-
     void UpdateAI(uint32 diff) override
     {
         if (!UpdateVictim())

src/server/scripts/Outland/CoilfangReservoir/TheUnderbog/instance_the_underbog.cpp

@@ -31,15 +31,34 @@ class instance_the_underbog : public InstanceMapScript
 public:
     instance_the_underbog() : InstanceMapScript(TheUndebogScriptName, 546) { }
 
+    struct instance_the_underbog_InstanceMapScript : public InstanceScript
+    {
+        instance_the_underbog_InstanceMapScript(InstanceMap* map) : InstanceScript(map)
+        {
+            SetHeaders(TheUndebogDataHeader);
+            SetBossNumber(TheUnderbogBossCount);
+        }
+
+        void OnUnitDeath(Unit* unit) override
+        {
+            switch (unit->GetEntry())
+            {
+                case NPC_GHAZAN:
+                    SetBossState(DATA_GHAZAN, DONE);
+                    break;
+                case NPC_SWAMPLORD_MUSELEK:
+                    SetBossState(DATA_SWAMPLORD_MUSELEK, DONE);
+                    break;
+                default:
+                    break;
+            }
+        }
+    };
+
     InstanceScript* GetInstanceScript(InstanceMap* map) const override
     {
         return new instance_the_underbog_InstanceMapScript(map);
     }
-
-    struct instance_the_underbog_InstanceMapScript : public InstanceScript
-    {
-        instance_the_underbog_InstanceMapScript(InstanceMap* map) : InstanceScript(map) { }
-    };
 };
 
 void AddSC_instance_the_underbog()

src/server/scripts/Outland/CoilfangReservoir/TheUnderbog/the_underbog.h

@@ -20,8 +20,25 @@
 
 #include "CreatureAIImpl.h"
 
+#define TheUndebogDataHeader "UBOG"
 #define TheUndebogScriptName "instance_the_underbog"
 
+constexpr uint32 TheUnderbogBossCount = 4;
+
+enum TheUnderbogDataId
+{
+    DATA_HUNGARFEN          = 0,
+    DATA_GHAZAN             = 1,
+    DATA_SWAMPLORD_MUSELEK  = 2,
+    DATA_THE_BLACK_STALKER  = 3
+};
+
+enum TheUnderbogCreatureId
+{
+    NPC_GHAZAN              = 18105,
+    NPC_SWAMPLORD_MUSELEK   = 17826
+};
+
 template <class AI, class T>
 inline AI* GetTheUnderbogAI(T* obj)
 {