Core/Spell Mechanics: introduce global cooldown manager for server-side checks for GCD (ported from mangos)

src/server/game/Spells/Spell.cpp

@@ -3001,6 +3001,8 @@ void Spell::prepare(SpellCastTargets const* targets, AuraEffect const * triggere
         m_caster->SetCurrentCastedSpell(this);
         SendSpellStart();
 
+        TriggerGlobalCooldown();
+
         if (m_caster->GetTypeId() == TYPEID_PLAYER)
             m_caster->ToPlayer()->AddGlobalCooldown(m_spellInfo,this);
 
@@ -3027,6 +3029,7 @@ void Spell::cancel()
     switch (oldState)
     {
         case SPELL_STATE_PREPARING:
+            CancelGlobalCooldown();
         case SPELL_STATE_DELAYED:
             SendInterrupted(0);
             SendCastResult(SPELL_FAILED_INTERRUPTED);
@@ -4680,6 +4683,10 @@ SpellCastResult Spell::CheckCast(bool strict)
         }
     }
 
+    // Check global cooldown
+    if (strict && !m_IsTriggeredSpell && HasGlobalCooldown())
+        return SPELL_FAILED_NOT_READY;
+
     // only allow triggered spells if at an ended battleground
     if (!m_IsTriggeredSpell && m_caster->GetTypeId() == TYPEID_PLAYER)
         if (Battleground * bg = m_caster->ToPlayer()->GetBattleground())
@@ -7285,3 +7292,65 @@ void Spell::CallScriptAfterUnitTargetSelectHandlers(std::list<Unit*>& unitTarget
         (*scritr)->_FinishScriptCall();
     }
 }
+
+enum eGCD {
+    MIN_GCD = 1000,
+    MAX_GCD = 1500
+};
+
+bool Spell::HasGlobalCooldown()
+{
+    // Only player or controlled units have global cooldown
+    if (m_caster->GetCharmInfo())
+        return m_caster->GetCharmInfo()->GetGlobalCooldownMgr().HasGlobalCooldown(m_spellInfo);
+    else if (m_caster->GetTypeId() == TYPEID_PLAYER)
+        return m_caster->ToPlayer()->GetGlobalCooldownMgr().HasGlobalCooldown(m_spellInfo);
+    else
+        return false;
+}
+
+void Spell::TriggerGlobalCooldown()
+{
+    int32 gcd = m_spellInfo->StartRecoveryTime;
+    if (!gcd)
+        return;
+
+    // Global cooldown can't leave range 1..1.5 secs
+    // There are some spells (mostly not casted directly by player) that have < 1 sec and > 1.5 sec global cooldowns
+    // but as tests show are not affected by any spell mods.
+    if (m_spellInfo->StartRecoveryTime >= MIN_GCD && m_spellInfo->StartRecoveryTime <= MAX_GCD)
+    {
+        // gcd modifier auras are applied only to own spells and only players have such mods
+        if (m_caster->GetTypeId() == TYPEID_PLAYER)
+            m_caster->ToPlayer()->ApplySpellMod(m_spellInfo->Id, SPELLMOD_GLOBAL_COOLDOWN, gcd, this);
+
+        // Apply haste rating
+        gcd = int32(float(gcd) * m_caster->GetFloatValue(UNIT_MOD_CAST_SPEED));
+        if (gcd < MIN_GCD)
+            gcd = MIN_GCD;
+        else if (gcd > MAX_GCD)
+            gcd = MAX_GCD;
+    }
+
+    // Only players or controlled units have global cooldown
+    if (m_caster->GetCharmInfo())
+        m_caster->GetCharmInfo()->GetGlobalCooldownMgr().AddGlobalCooldown(m_spellInfo, gcd);
+    else if (m_caster->GetTypeId() == TYPEID_PLAYER)
+        m_caster->ToPlayer()->GetGlobalCooldownMgr().AddGlobalCooldown(m_spellInfo, gcd);
+}
+
+void Spell::CancelGlobalCooldown()
+{
+    if (!m_spellInfo->StartRecoveryTime)
+        return;
+
+    // Cancel global cooldown when interrupting current cast
+    if (m_caster->GetCurrentSpell(CURRENT_GENERIC_SPELL) != this)
+        return;
+
+    // Only players or controlled units have global cooldown
+    if (m_caster->GetCharmInfo())
+        m_caster->GetCharmInfo()->GetGlobalCooldownMgr().CancelGlobalCooldown(m_spellInfo);
+    else if (m_caster->GetTypeId() == TYPEID_PLAYER)
+        m_caster->ToPlayer()->GetGlobalCooldownMgr().CancelGlobalCooldown(m_spellInfo);
+}

src/server/game/Spells/Spell.h

@@ -543,6 +543,9 @@ class Spell
 
         void SetSpellValue(SpellValueMod mod, int32 value);
     protected:
+        bool HasGlobalCooldown();
+        void TriggerGlobalCooldown();
+        void CancelGlobalCooldown();
 
         void SendLoot(uint64 guid, LootType loottype);