From 7690f02b49c82c65de3e92307063211a2e9941f5 Mon Sep 17 00:00:00 2001
From: Kitzunu <24550914+Kitzunu@users.noreply.github.com>
Date: Thu, 21 Jan 2021 20:49:05 +0100
Subject: [PATCH] feat(Core/Spell): Implement ValidateSpellInfo

* Cherry-pick from https://github.com/TrinityCore/TrinityCore/commit/2b5d7eef3a091e67c27e853d43ac0bebbfa67531 & https://github.com/TrinityCore/TrinityCore/commit/a0a158b5b851db7e2c16819ec89e913d914a3aba
---
 src/server/game/Spells/SpellScript.cpp | 16 ++++++++++++++++
 src/server/game/Spells/SpellScript.h   | 14 ++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/src/server/game/Spells/SpellScript.cpp b/src/server/game/Spells/SpellScript.cpp
index 42128ee611..65588300f0 100644
--- a/src/server/game/Spells/SpellScript.cpp
+++ b/src/server/game/Spells/SpellScript.cpp
@@ -20,6 +20,22 @@ bool _SpellScript::_Validate(SpellInfo const* entry)
     return true;
 }
 
+bool _SpellScript::_ValidateSpellInfo(uint32 const* begin, uint32 const* end)
+{
+    bool allValid = true;
+    while (begin != end)
+    {
+        if (!sSpellMgr->GetSpellInfo(*begin))
+        {
+            sLog->outError("_SpellScript::ValidateSpellInfo: Spell %u does not exist.", *begin);
+            allValid = false;
+        }
+
+        ++begin;
+    }
+    return allValid;
+}
+
 void _SpellScript::_Register()
 {
     m_currentScriptState = SPELL_SCRIPT_STATE_REGISTRATION;
diff --git a/src/server/game/Spells/SpellScript.h b/src/server/game/Spells/SpellScript.h
index 74245592e1..b856578eab 100644
--- a/src/server/game/Spells/SpellScript.h
+++ b/src/server/game/Spells/SpellScript.h
@@ -110,6 +110,20 @@ public:
     // Function called when script is destroyed
     // use for: deallocating memory allocated by script
     virtual void Unload() {}
+    // Helpers
+    static bool ValidateSpellInfo(std::initializer_list<uint32> spellIds)
+    {
+        return _ValidateSpellInfo(spellIds.begin(), spellIds.end());
+    }
+
+    template <class T>
+    static bool ValidateSpellInfo(T const& spellIds)
+    {
+        return _ValidateSpellInfo(std::begin(spellIds), std::end(spellIds));
+    }
+
+private:
+    static bool _ValidateSpellInfo(uint32 const* begin, uint32 const* end);
 };
 
 // SpellScript interface - enum used for runtime checks of script function calls