CORE/Spell: add diminishing returns on reflected spell. (#1050)

Fix "Spell which is reflected doesn't create DR on whom is casting the spell"
Now warrior would not add diminishing returns if he reflect spell (code may be a bit hacky)

Closes issue #650 on github

src/server/game/Spells/Spell.cpp

@@ -639,6 +639,8 @@ m_caster((info->HasAttribute(SPELL_ATTR6_CAST_BY_CHARMER) && caster->GetCharmerO
 
     m_channelTargetEffectMask = 0;
 
+    m_spellFlags = SPELL_FLAG_NORMAL;
+
     // Determine if spell can be reflected back to the caster
     // Patch 1.2 notes: Spell Reflection no longer reflects abilities
     m_canReflect = m_spellInfo->DmgClass == SPELL_DAMAGE_CLASS_MAGIC && !m_spellInfo->HasAttribute(SPELL_ATTR0_ABILITY)
@@ -774,7 +776,11 @@ void Spell::SelectExplicitTargets()
                     break;
             }
             if (redirect && (redirect != target))
+            {
                 m_targets.SetUnitTarget(redirect);
+                m_spellFlags |= SPELL_FLAG_REDIRECTED;
+            }
+               
         }
     }
 }
@@ -2407,6 +2413,8 @@ void Spell::AddUnitTarget(Unit* target, uint32 effectMask, bool checkIfValid /*=
         m_caster->m_Events.AddEvent(new ReflectEvent(m_caster->GetGUID(), targetInfo.targetGUID, m_spellInfo), m_caster->m_Events.CalculateTime(targetInfo.timeDelay));
         targetInfo.timeDelay += targetInfo.timeDelay >> 1;
 
+        m_spellFlags |= SPELL_FLAG_REFLECTED;
+        
         // HACK: workaround check for succubus seduction case
         // TODO: seduction should be casted only on humanoids (not demons)
         if (m_caster->IsPet())
@@ -2964,11 +2972,15 @@ SpellMissInfo Spell::DoSpellHitOnUnit(Unit* unit, uint32 effectMask, bool scaleA
         if (effectMask & (1 << i) && m_spellInfo->Effects[i].IsUnitOwnedAuraEffect())
             aura_effmask |= 1 << i;
 
+    Unit * originalCaster = GetOriginalCaster();
+    if (!originalCaster)
+        originalCaster = m_caster;
+
     // Get Data Needed for Diminishing Returns, some effects may have multiple auras, so this must be done on spell hit, not aura add
     // Xinef: Do not increase diminishing level for self cast
     m_diminishGroup = GetDiminishingReturnsGroupForSpell(m_spellInfo, m_triggeredByAuraSpell);
     // xinef: do not increase diminish level for bosses (eg. Void Reaver silence is never diminished)
-    if (aura_effmask && m_diminishGroup && unit != m_caster && (m_caster->GetTypeId() != TYPEID_UNIT || !m_caster->ToCreature()->isWorldBoss()))
+    if (((m_spellFlags & SPELL_FLAG_REFLECTED) && !(unit->HasAuraType(SPELL_AURA_REFLECT_SPELLS))) || (aura_effmask && m_diminishGroup && unit != m_caster && (m_caster->GetTypeId() != TYPEID_UNIT || !m_caster->ToCreature()->isWorldBoss())))
     {
         m_diminishLevel = unit->GetDiminishing(m_diminishGroup);
         DiminishingReturnsType type = GetDiminishingReturnsGroupType(m_diminishGroup);
@@ -5506,7 +5518,7 @@ SpellCastResult Spell::CheckCast(bool strict)
                 return SPELL_FAILED_NOT_INFRONT;
 
             if (m_caster->GetEntry() != WORLD_TRIGGER) // Ignore LOS for gameobjects casts (wrongly casted by a trigger)
-                if ((!m_caster->IsTotem() || !m_spellInfo->IsPositive()) && !m_spellInfo->HasAttribute(SPELL_ATTR2_CAN_TARGET_NOT_IN_LOS) && !m_spellInfo->HasAttribute(SPELL_ATTR5_SKIP_CHECKCAST_LOS_CHECK) && !m_caster->IsWithinLOSInMap(target))
+                if ((!m_caster->IsTotem() || !m_spellInfo->IsPositive()) && !m_spellInfo->HasAttribute(SPELL_ATTR2_CAN_TARGET_NOT_IN_LOS) && !m_spellInfo->HasAttribute(SPELL_ATTR5_SKIP_CHECKCAST_LOS_CHECK) && !m_caster->IsWithinLOSInMap(target) && !(m_spellFlags & SPELL_FLAG_REDIRECTED))
                     return SPELL_FAILED_LINE_OF_SIGHT;
         }
     }
@@ -7430,7 +7442,7 @@ bool Spell::CheckEffectTarget(Unit const* target, uint32 eff) const
                 if (target->GetGUID() != corpse->GetOwnerGUID())
                     return false;
 
-                if (!corpse->IsWithinLOSInMap(m_caster))
+                if (!corpse->IsWithinLOSInMap(m_caster) && !(m_spellFlags & SPELL_FLAG_REDIRECTED))
                     return false;
             }
             break;

src/server/game/Spells/Spell.h

@@ -61,6 +61,14 @@ enum SpellCastFlags
     CAST_FLAG_UNKNOWN_32         = 0x80000000,
 };
 
+//Spells casted on self should not be diminished.
+enum SpellFlags
+{
+    SPELL_FLAG_NORMAL = 0x00,
+    SPELL_FLAG_REFLECTED = 0x01,        // reflected spell
+    SPELL_FLAG_REDIRECTED = 0x02        // redirected spell
+};
+
 enum SpellRangeFlag
 {
     SPELL_RANGE_DEFAULT             = 0,
@@ -553,6 +561,9 @@ class Spell
         int32 m_casttime;                                   // Calculated spell cast time initialized only in Spell::prepare
         int32 m_channeledDuration;                          // Calculated channeled spell duration in order to calculate correct pushback.
         bool m_canReflect;                                  // can reflect this spell?
+
+        uint8 m_spellFlags;                                 // for spells whose target was changed in cast i.e. due to reflect
+
         bool m_autoRepeat;
         uint8 m_runesState;