Core/Scripts: implemented Fungal Decay & Tail Sting

Refs #18542

(cherry picked from commit 7dc78d8e3f437ad7f3ad40bf1ef6801ac1ed5fc2)

2 files changed, 122 insertions, 0 deletions

diff --git a/sql/updates/world/master/2021_06_22_02_world_2018_02_16_02_world.sql b/sql/updates/world/master/2021_06_22_02_world_2018_02_16_02_world.sql
new file mode 100644
index 00000000000..ac6733d1059
--- /dev/null
+++ b/sql/updates/world/master/2021_06_22_02_world_2018_02_16_02_world.sql
@@ -0,0 +1,8 @@
+DELETE FROM `spell_proc` WHERE `SpellId` IN (32065, 36659);
+INSERT INTO `spell_proc` (`SpellId`, `SchoolMask`, `SpellFamilyName`, `SpellFamilyMask0`, `SpellFamilyMask1`, `SpellFamilyMask2`, `ProcFlags`, `SpellTypeMask`, `SpellPhaseMask`, `HitMask`, `AttributesMask`, `ProcsPerMinute`, `Chance`, `Cooldown`, `Charges`) VALUES
+(32065, 0x0, 0, 0x00000000, 0x00000000, 0x00000000, 0x80000, 0x1, 0x0, 0x0, 0x0, 0, 0, 0, 0),
+(36659, 0x0, 0, 0x00000000, 0x00000000, 0x00000000, 0x80000, 0x1, 0x0, 0x0, 0x0, 0, 0, 0, 0);
+DELETE FROM `spell_script_names` WHERE `ScriptName` IN ('spell_gen_decay_over_time_fungal_decay','spell_gen_decay_over_time_tail_sting');
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(32065, 'spell_gen_decay_over_time_fungal_decay'),
+(36659, 'spell_gen_decay_over_time_tail_sting');
diff --git a/src/server/scripts/Spells/spell_generic.cpp b/src/server/scripts/Spells/spell_generic.cpp
index 736ea803973..e6a36a36ed0 100644
--- a/src/server/scripts/Spells/spell_generic.cpp
+++ b/src/server/scripts/Spells/spell_generic.cpp
@@ -1143,6 +1143,118 @@ class spell_gen_dalaran_disguise : public SpellScriptLoader
         }
 };
 
+class spell_gen_decay_over_time : public SpellScriptLoader
+{
+    public:
+        spell_gen_decay_over_time(char const* name) : SpellScriptLoader(name) { }
+
+        SpellScript* GetSpellScript() const override
+        {
+            return new spell_gen_decay_over_time_SpellScript();
+        }
+
+    private:
+        class spell_gen_decay_over_time_SpellScript : public SpellScript
+        {
+            PrepareSpellScript(spell_gen_decay_over_time_SpellScript);
+
+            void ModAuraStack()
+            {
+                if (Aura* aur = GetHitAura())
+                    aur->SetStackAmount(static_cast<uint8>(GetSpellInfo()->StackAmount));
+            }
+
+            void Register() override
+            {
+                AfterHit += SpellHitFn(spell_gen_decay_over_time_SpellScript::ModAuraStack);
+            }
+        };
+
+    protected:
+        class spell_gen_decay_over_time_AuraScript : public AuraScript
+        {
+            protected:
+                PrepareAuraScript(spell_gen_decay_over_time_AuraScript);
+
+                bool CheckProc(ProcEventInfo& eventInfo)
+                {
+                    return (eventInfo.GetSpellInfo() == GetSpellInfo());
+                }
+
+                void Decay(ProcEventInfo& /*eventInfo*/)
+                {
+                    PreventDefaultAction();
+                    ModStackAmount(-1);
+                }
+
+                void Register() override
+                {
+                    DoCheckProc += AuraCheckProcFn(spell_gen_decay_over_time_AuraScript::CheckProc);
+                    OnProc += AuraProcFn(spell_gen_decay_over_time_AuraScript::Decay);
+                }
+
+                ~spell_gen_decay_over_time_AuraScript() = default;
+        };
+
+        ~spell_gen_decay_over_time() = default;
+};
+
+enum FungalDecay
+{
+    // found in sniffs, there is no duration entry we can possibly use
+    AURA_DURATION = 12600
+};
+
+// 32065 - Fungal Decay
+class spell_gen_decay_over_time_fungal_decay : public spell_gen_decay_over_time
+{
+    public:
+        spell_gen_decay_over_time_fungal_decay() : spell_gen_decay_over_time("spell_gen_decay_over_time_fungal_decay") { }
+
+        class spell_gen_decay_over_time_fungal_decay_AuraScript : public spell_gen_decay_over_time_AuraScript
+        {
+            PrepareAuraScript(spell_gen_decay_over_time_fungal_decay_AuraScript);
+
+            void ModDuration(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+            {
+                // only on actual reapply, not on stack decay
+                if (GetDuration() == GetMaxDuration())
+                {
+                    SetMaxDuration(AURA_DURATION);
+                    SetDuration(AURA_DURATION);
+                }
+            }
+
+            void Register() override
+            {
+                spell_gen_decay_over_time_AuraScript::Register();
+                OnEffectApply += AuraEffectApplyFn(spell_gen_decay_over_time_fungal_decay_AuraScript::ModDuration, EFFECT_0, SPELL_AURA_MOD_DECREASE_SPEED, AURA_EFFECT_HANDLE_REAL_OR_REAPPLY_MASK);
+            }
+        };
+
+        AuraScript* GetAuraScript() const override
+        {
+            return new spell_gen_decay_over_time_fungal_decay_AuraScript();
+        }
+};
+
+// 36659 - Tail Sting
+class spell_gen_decay_over_time_tail_sting : public spell_gen_decay_over_time
+{
+    public:
+        spell_gen_decay_over_time_tail_sting() : spell_gen_decay_over_time("spell_gen_decay_over_time_tail_sting") { }
+
+        class spell_gen_decay_over_time_tail_sting_AuraScript : public spell_gen_decay_over_time_AuraScript
+        {
+            PrepareAuraScript(spell_gen_decay_over_time_tail_sting_AuraScript);
+        };
+
+        AuraScript* GetAuraScript() const override
+        {
+            return new spell_gen_decay_over_time_tail_sting_AuraScript();
+        }
+};
+
 enum DefendVisuals
 {
     SPELL_VISUAL_SHIELD_1 = 63130,
@@ -3928,6 +4040,8 @@ void AddSC_generic_spell_scripts()
     RegisterAuraScript(spell_gen_creature_permanent_feign_death);
     new spell_gen_dalaran_disguise("spell_gen_sunreaver_disguise");
     new spell_gen_dalaran_disguise("spell_gen_silver_covenant_disguise");
+    new spell_gen_decay_over_time_fungal_decay();
+    new spell_gen_decay_over_time_tail_sting();
     RegisterAuraScript(spell_gen_defend);
     RegisterSpellScript(spell_gen_despawn_self);
     RegisterSpellScript(spell_gen_divine_storm_cd_reset);