From e81b5838a6780a73946047c627583cdb837df58d Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Thu, 20 Aug 2020 15:49:59 +0200
Subject: Core/Scripts: Unify RegisterSpellScript and RegisterAuraScript macros
 to do the same thing and implemented passing custom arguments to spell script
 classes

(cherry picked from commit 75a6a7a0ad48874e75dd71f766dad3707341bb32)
---
 src/server/game/Scripting/ScriptMgr.h | 61 +++++++++++++++++++++++------------
 1 file changed, 40 insertions(+), 21 deletions(-)

(limited to 'src')

diff --git a/src/server/game/Scripting/ScriptMgr.h b/src/server/game/Scripting/ScriptMgr.h
index 5f25655d2bc..0e2c48f4e06 100644
--- a/src/server/game/Scripting/ScriptMgr.h
+++ b/src/server/game/Scripting/ScriptMgr.h
@@ -20,6 +20,8 @@
 
 #include "Common.h"
 #include "ObjectGuid.h"
+#include "Tuples.h"
+#include "Types.h"
 #include <vector>
 
 class AccountMgr;
@@ -1195,33 +1197,50 @@ class TC_GAME_API ScriptMgr
         std::string _currentContext;
 };
 
-template <class S>
-class GenericSpellScriptLoader : public SpellScriptLoader
+namespace Trinity::SpellScripts
 {
-    public:
-        GenericSpellScriptLoader(char const* name) : SpellScriptLoader(name) { }
-        SpellScript* GetSpellScript() const override { return new S(); }
-};
-#define RegisterSpellScript(spell_script) new GenericSpellScriptLoader<spell_script>(#spell_script)
+    template<typename T>
+    using is_SpellScript = std::is_base_of<SpellScript, T>;
 
-template <class A>
-class GenericAuraScriptLoader : public SpellScriptLoader
-{
-    public:
-        GenericAuraScriptLoader(char const* name) : SpellScriptLoader(name) { }
-        AuraScript* GetAuraScript() const override { return new A(); }
-};
-#define RegisterAuraScript(aura_script) new GenericAuraScriptLoader<aura_script>(#aura_script)
+    template<typename T>
+    using is_AuraScript = std::is_base_of<AuraScript, T>;
+}
 
-template <class S, class A>
+template <typename... Ts>
 class GenericSpellAndAuraScriptLoader : public SpellScriptLoader
 {
-    public:
-        GenericSpellAndAuraScriptLoader(char const* name) : SpellScriptLoader(name) { }
-        SpellScript* GetSpellScript() const override { return new S(); }
-        AuraScript* GetAuraScript() const override { return new A(); }
+    using SpellScriptType = typename Trinity::find_type_if_t<Trinity::SpellScripts::is_SpellScript, Ts...>;
+    using AuraScriptType = typename Trinity::find_type_if_t<Trinity::SpellScripts::is_AuraScript, Ts...>;
+    using ArgsType = typename Trinity::find_type_if_t<Trinity::is_tuple, Ts...>;
+
+public:
+    GenericSpellAndAuraScriptLoader(char const* name, ArgsType&& args) : SpellScriptLoader(name), _args(std::move(args)) { }
+
+private:
+    SpellScript* GetSpellScript() const override
+    {
+        if constexpr (!std::is_same_v<SpellScriptType, Trinity::find_type_end>)
+            return Trinity::new_from_tuple<SpellScriptType>(_args);
+        else
+            return nullptr;
+    }
+
+    AuraScript* GetAuraScript() const override
+    {
+        if constexpr (!std::is_same_v<AuraScriptType, Trinity::find_type_end>)
+            return Trinity::new_from_tuple<AuraScriptType>(_args);
+        else
+            return nullptr;
+    }
+
+    ArgsType _args;
 };
-#define RegisterSpellAndAuraScriptPair(spell_script, aura_script) new GenericSpellAndAuraScriptLoader<spell_script, aura_script>(#spell_script)
+
+#define RegisterSpellScriptWithArgs(spell_script, script_name, ...) new GenericSpellAndAuraScriptLoader<spell_script, decltype(std::make_tuple(__VA_ARGS__))>(script_name, std::make_tuple(__VA_ARGS__))
+#define RegisterSpellScript(spell_script) RegisterSpellScriptWithArgs(spell_script, #spell_script)
+#define RegisterAuraScript(aura_script) RegisterSpellScriptWithArgs(aura_script, #aura_script)
+#define RegisterSpellAndAuraScriptPairWithArgs(script_1, script_2, script_name, ...) new GenericSpellAndAuraScriptLoader<script_1, script_2, decltype(std::make_tuple(__VA_ARGS__))>(script_name, std::make_tuple(__VA_ARGS__))
+#define RegisterSpellAndAuraScriptPair(script_1, script_2) RegisterSpellAndAuraScriptPairWithArgs(script_1, script_2, #script_1)
 
 template <class AI>
 class GenericCreatureScript : public CreatureScript
-- 
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