Scripts/Priest: Implement Trail of Light (TrinityCore#29096)

sql/updates/world/master/2023_07_01_01_world.sql

@@ -0,0 +1,8 @@
+DELETE FROM `spell_script_names` WHERE `spell_id`=200128;
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES 
+(200128, 'spell_pri_trail_of_light');
+
+DELETE FROM `spell_proc` WHERE `SpellId` IN (200128);
+INSERT INTO `spell_proc` (`SpellId`,`SchoolMask`,`SpellFamilyName`,`SpellFamilyMask0`,`SpellFamilyMask1`,`SpellFamilyMask2`,`SpellFamilyMask3`,`ProcFlags`,`ProcFlags2`,`SpellTypeMask`,`SpellPhaseMask`,`HitMask`,`AttributesMask`,`DisableEffectsMask`,`ProcsPerMinute`,`Chance`,`Cooldown`,`Charges`) VALUES
+(200128,0x00,6,0x00001800,0x00000000,0x00000000,0x00000000,0x0,0x0,0x2,0x2,0x3,0x0,0x0,0,0,0,0); -- Trail of Light
+

src/server/scripts/Spells/spell_priest.cpp

@@ -114,6 +114,7 @@ enum PriestSpells
     SPELL_PRIEST_STRENGTH_OF_SOUL                   = 197535,
     SPELL_PRIEST_STRENGTH_OF_SOUL_EFFECT            = 197548,
     SPELL_PRIEST_THE_PENITENT_AURA                  = 200347,
+    SPELL_PRIEST_TRAIL_OF_LIGHT_HEAL                = 234946,
     SPELL_PRIEST_TRINITY                            = 214205,
     SPELL_PRIEST_VAMPIRIC_EMBRACE_HEAL              = 15290,
     SPELL_PRIEST_VAMPIRIC_TOUCH_DISPEL              = 64085,
@@ -1801,6 +1802,64 @@ class spell_pri_t10_heal_2p_bonus : public AuraScript
     }
 };
 
+// 200128 - Trail of Light
+class spell_pri_trail_of_light : public AuraScript
+{
+    PrepareAuraScript(spell_pri_trail_of_light);
+
+    bool Validate(SpellInfo const* /*spellInfo*/) override
+    {
+        return ValidateSpellInfo({ SPELL_PRIEST_TRAIL_OF_LIGHT_HEAL });
+    }
+
+    bool CheckProc(ProcEventInfo& eventInfo)
+    {
+        if (_healQueue.empty() || _healQueue.back() != eventInfo.GetActionTarget()->GetGUID())
+            _healQueue.push(eventInfo.GetActionTarget()->GetGUID());
+
+        if (_healQueue.size() > 2)
+            _healQueue.pop();
+
+        if (_healQueue.size() == 2)
+            return true;
+
+        return false;
+    }
+
+    void HandleOnProc(AuraEffect* aurEff, ProcEventInfo& eventInfo)
+    {
+        Unit* caster = GetTarget();
+        Unit* oldTarget = ObjectAccessor::GetUnit(*caster, _healQueue.front());
+        if (!oldTarget)
+            return;
+
+        // Note: old target may not be friendly anymore due to charm and faction change effects.
+        if (!caster->IsValidAssistTarget(oldTarget))
+            return;
+
+        SpellInfo const* healSpellInfo = sSpellMgr->GetSpellInfo(SPELL_PRIEST_TRAIL_OF_LIGHT_HEAL, DIFFICULTY_NONE);
+        if (!healSpellInfo)
+            return;
+
+        // Note: distance may be greater than the heal's spell range.
+        if (!caster->IsWithinDist(oldTarget, healSpellInfo->GetMaxRange(true, caster)))
+            return;
+
+        uint32 healAmount = CalculatePct(eventInfo.GetHealInfo()->GetHeal(), aurEff->GetAmount());
+
+        caster->CastSpell(oldTarget, SPELL_PRIEST_TRAIL_OF_LIGHT_HEAL, CastSpellExtraArgs(aurEff).AddSpellBP0(healAmount));
+    }
+
+    void Register() override
+    {
+        DoCheckProc += AuraCheckProcFn(spell_pri_trail_of_light::CheckProc);
+        OnEffectProc += AuraEffectProcFn(spell_pri_trail_of_light::HandleOnProc, EFFECT_0, SPELL_AURA_DUMMY);
+    }
+
+private:
+    std::queue<ObjectGuid> _healQueue;
+};
+
 // 109142 - Twist of Fate (Shadow)
 // 265259 - Twist of Fate (Discipline)
 class spell_pri_twist_of_fate : public AuraScript
@@ -1963,6 +2022,7 @@ void AddSC_priest_spell_scripts()
     RegisterSpellScript(spell_pri_spirit_of_redemption);
     RegisterSpellScript(spell_pri_shadow_mend);
     RegisterSpellScript(spell_pri_shadow_mend_periodic_damage);
+    RegisterSpellScript(spell_pri_trail_of_light);
     RegisterSpellScript(spell_pri_t3_4p_bonus);
     RegisterSpellScript(spell_pri_t5_heal_2p_bonus);
     RegisterSpellScript(spell_pri_t10_heal_2p_bonus);