fix(Scripts/SSC): Script Hydross OOC event (#17804)

* fix(Scripts/SSC): Script Hydross OOC event

* Update rev_1700448248255858600.sql

* Update boss_hydross_the_unstable.cpp

* Update rev_1700448248255858600.sql

data/sql/updates/pending_db_world/rev_1700448248255858600.sql

@@ -0,0 +1,27 @@
+--
+DELETE FROM `spell_target_position` WHERE `id` = 36459;
+INSERT INTO `spell_target_position` (`ID`, `EffectIndex`, `MapID`, `PositionX`, `PositionY`, `PositionZ`, `Orientation`, `VerifiedBuild`) VALUES
+(36459, 0, 548, -347.518, -350.367, 1.07459, 0, 52188);
+
+DELETE FROM `creature` WHERE `id1` IN (21260, 21253);
+
+SET @NPC := 21253;
+SET @PATH := @NPC * 10;
+DELETE FROM `waypoint_data` WHERE `id`=@PATH;
+INSERT INTO `waypoint_data` (`id`,`point`,`position_x`,`position_y`,`position_z`,`orientation`,`delay`,`move_type`,`action`,`action_chance`,`wpguid`) VALUES
+(@PATH,1,-323.41907,-329.45224,-1.5974255,0,0,0,0,100,0),
+(@PATH,2,-304.07327,-324.3901,-1.6223572,0,0,0,0,100,0),
+(@PATH,3,-285.72675,-317.75647,-1.6231745,0,0,0,0,100,0),
+(@PATH,4,-268.1212,-317.92252,-1.6231549,0,0,0,0,100,0),
+(@PATH,5,-250.01706,-326.13535,-1.6231577,0,0,0,0,100,0),
+(@PATH,6,-232.28586,-345.37613,-0.82795566,0,3000,0,0,100,0),
+(@PATH,7,-207.17967,-340.97714,-1.6231886,0,0,0,0,100,0),
+(@PATH,8,-191.20467,-342.70514,-1.6231867,0,0,0,0,100,0),
+(@PATH,9,-179.45354,-352.66028,-1.6231802,0,0,0,0,100,0),
+(@PATH,10,-168.25655,-366.4079,-1.6235477,0,0,0,0,100,0),
+(@PATH,11,-157.60028,-380.57797,-1.618623,0,0,0,0,100,0),
+(@PATH,12,-142.09798,-404.16937,0.4633386,0,0,0,0,100,0),
+(@PATH,13,-146.7672,-423.9643,1.0743836,0,0,0,0,100,0);
+
+DELETE FROM `creature_addon` WHERE `guid` IN (81027, 82865, 82967, 93788);
+DELETE FROM `linked_respawn` WHERE `guid` IN (81027, 82865, 82967, 93788);

src/server/game/Movement/MovementGenerators/WaypointMovementGenerator.cpp

@@ -263,6 +263,19 @@ void WaypointMovementGenerator<Creature>::MovementInform(Creature* creature)
             AI->SummonMovementInform(creature, WAYPOINT_MOTION_TYPE, i_currentNode);
         }
     }
+    else
+    {
+        if (TempSummon* tempSummon = creature->ToTempSummon())
+        {
+            if (Unit* owner = tempSummon->GetSummonerUnit())
+            {
+                if (UnitAI* AI = owner->GetAI())
+                {
+                    AI->SummonMovementInform(creature, WAYPOINT_MOTION_TYPE, i_currentNode);
+                }
+            }
+        }
+    }
 }
 
 //----------------------------------------------------//

src/server/scripts/Outland/CoilfangReservoir/SerpentShrine/boss_hydross_the_unstable.cpp

@@ -36,6 +36,8 @@ enum Spells
     SPELL_CLEANSING_FIELD       = 37934,
     SPELL_BLUE_BEAM             = 38015,
     SPELL_ELEMENTAL_SPAWNIN     = 25035,
+    SPELL_PURIFY_ELEMENTAL      = 36461,
+    SPELL_SUMMON_ELEMENTAL      = 36459,
 
     SPELL_SUMMON_CORRUPTED1     = 38188,
     SPELL_SUMMON_CORRUPTED2     = 38189,
@@ -68,24 +70,36 @@ enum Spells
 enum Misc
 {
     GROUP_ABILITIES                 = 1,
+    GROUP_OOC_PURIFY_ELEMENTALS     = 2,
+
+    NPC_PURIFIED_WATER_ELEMENTAL    = 21260,
     NPC_PURE_SPAWN_OF_HYDROSS       = 22035,
+    NPC_TAINTED_HYDROSS_ELEMENTAL   = 21253
+};
+
+enum WaterElementalPathIds
+{
+    PATH_CENTER                     = 5,
+    PATH_END                        = 12
 };
 
 struct boss_hydross_the_unstable : public BossAI
 {
-    boss_hydross_the_unstable(Creature* creature) : BossAI(creature, DATA_HYDROSS_THE_UNSTABLE)
+    boss_hydross_the_unstable(Creature* creature) : BossAI(creature, DATA_HYDROSS_THE_UNSTABLE), _recentlySpoken(false) { }
-    {
-        scheduler.SetValidator([this]
-        {
-            return !me->HasUnitState(UNIT_STATE_CASTING);
-        });
-    }
 
     void Reset() override
     {
-        BossAI::Reset();
+        _Reset();
-
         _recentlySpoken = false;
+        SummonTaintedElementalOOC();
+    }
+
+    void SummonTaintedElementalOOC()
+    {
+        me->m_Events.AddEventAtOffset([this] {
+            DoCastAOE(SPELL_SUMMON_ELEMENTAL);
+            SummonTaintedElementalOOC();
+        }, 12s, 12s, GROUP_OOC_PURIFY_ELEMENTALS);
     }
 
     void JustReachedHome() override
@@ -97,6 +111,27 @@ struct boss_hydross_the_unstable : public BossAI
         }
     }
 
+    void SummonMovementInform(Creature* summon, uint32 movementType, uint32 pathId) override
+    {
+        if (movementType == WAYPOINT_MOTION_TYPE)
+        {
+            if (pathId == PATH_CENTER)
+            {
+                summon->SetFacingToObject(me);
+                DoCast(summon, SPELL_PURIFY_ELEMENTAL);
+
+                // Happens even if Hydross is dead, so completely detached to the spell, which is nothing but a dummy anyways.
+                summon->m_Events.AddEventAtOffset([summon] {
+                    summon->UpdateEntry(NPC_PURIFIED_WATER_ELEMENTAL);
+                }, 1s);
+            }
+            else if (pathId == PATH_END)
+            {
+                summon->DespawnOrUnsummon();
+            }
+        }
+    }
+
     void SetForm(bool corrupt, bool initial)
     {
         scheduler.CancelGroup(GROUP_ABILITIES);
@@ -193,6 +228,7 @@ struct boss_hydross_the_unstable : public BossAI
         BossAI::JustEngagedWith(who);
         Talk(SAY_AGGRO);
         SetForm(false, true);
+        me->m_Events.CancelEventGroup(GROUP_OOC_PURIFY_ELEMENTALS);
 
         scheduler.Schedule(1s, [this](TaskContext context)
         {
@@ -222,14 +258,19 @@ struct boss_hydross_the_unstable : public BossAI
 
     void JustSummoned(Creature* summon) override
     {
-        summons.Summon(summon);
+        BossAI::JustSummoned(summon);
+
         summon->CastSpell(summon, SPELL_ELEMENTAL_SPAWNIN, true);
-        summon->SetInCombatWithZone();
 
         if (summon->GetEntry() == NPC_PURE_SPAWN_OF_HYDROSS)
         {
             summon->ApplySpellImmune(0, IMMUNITY_SCHOOL, SPELL_SCHOOL_MASK_FROST, true);
         }
+        else if (summon->GetEntry() == NPC_TAINTED_HYDROSS_ELEMENTAL)
+        {
+            summon->SetOwnerGUID(me->GetGUID());
+            summon->GetMotionMaster()->MovePath(summon->GetEntry() * 10, false);
+        }
         else
         {
             summon->ApplySpellImmune(0, IMMUNITY_SCHOOL, SPELL_SCHOOL_MASK_NATURE, true);