Core/Spells: Fix Glyph of Blast Wave (based on patch by dr.tenma), closes issue 3593

--HG--
branch : trunk

sql/base/world_database.sql

@@ -26898,6 +26898,7 @@ INSERT INTO `spell_script_names` (`spell_id`,`ScriptName`) VALUES
 ( 39610, 'spell_sha_mana_tide_totem'),
 ( -1535, 'spell_sha_fire_nova'),
 -- mage
+(-11113, 'spell_mage_blast_wave'),
 ( 11958, 'spell_mage_cold_snap'),
 ( 31687, 'spell_mage_summon_water_elemental'),
 ( 32826, 'spell_mage_polymorph_visual'),

sql/updates/10099_world_spell_script_names.sql

@@ -0,0 +1,3 @@
+DELETE FROM `spell_script_names` WHERE `spell_id` IN (-11113) AND `ScriptName` = 'spell_mage_blast_wave';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(-11113,'spell_mage_blast_wave');

src/server/scripts/Spells/spell_mage.cpp

@@ -35,6 +35,7 @@ enum MageSpells
     SPELL_MAGE_GLYPH_OF_ETERNAL_WATER            = 70937,
     SPELL_MAGE_SUMMON_WATER_ELEMENTAL_PERMANENT  = 70908,
     SPELL_MAGE_SUMMON_WATER_ELEMENTAL_TEMPORARY  = 70907,
+    SPELL_MAGE_GLYPH_OF_BLAST_WAVE               = 62126,
 };
 
 class spell_mage_cold_snap : public SpellScriptLoader
@@ -172,9 +173,42 @@ class spell_mage_summon_water_elemental : public SpellScriptLoader
         }
 };
 
+class spell_mage_blast_wave : public SpellScriptLoader
+{
+    public:
+        spell_mage_blast_wave() : SpellScriptLoader("spell_mage_blast_wave") { }
+
+        class spell_mage_blast_wave_SpellScript : public SpellScript
+        {
+            bool Validate(SpellEntry const * /*spellEntry*/)
+            {
+                if (!sSpellStore.LookupEntry(SPELL_MAGE_GLYPH_OF_BLAST_WAVE))
+                    return false;
+                return true;
+            }
+
+            void HandleKnockBack(SpellEffIndex effIndex)
+            {
+                if (GetCaster()->HasAura(SPELL_MAGE_GLYPH_OF_BLAST_WAVE))
+                    PreventHitDefaultEffect(effIndex);
+            }
+
+            void Register()
+            {
+                OnEffect += SpellEffectFn(spell_mage_blast_wave_SpellScript::HandleKnockBack, EFFECT_2, SPELL_EFFECT_KNOCK_BACK);
+            }
+        };
+
+        SpellScript * GetSpellScript() const
+        {
+            return new spell_mage_blast_wave_SpellScript();
+        }
+};
+
 void AddSC_mage_spell_scripts()
 {
     new spell_mage_cold_snap;
     new spell_mage_polymorph_cast_visual;
     new spell_mage_summon_water_elemental;
+    new spell_mage_blast_wave;
 }