Lua Scripting (#1334)

Closes #83
Fixes #1309
Fixes #1287
Fixes #1129 (actually fixed now)

src/lua/lua_manager.hpp

@@ -0,0 +1,67 @@
+#pragma once
+#include "lua_module.hpp"
+
+namespace big
+{
+	class lua_manager
+	{
+		std::mutex m_module_lock;
+
+	public:
+		lua_manager();
+		~lua_manager();
+
+		void draw_gui(rage::joaat_t tab_hash);
+		void unload_module(rage::joaat_t module_id);
+		void load_module(const std::string& module_name);
+		std::weak_ptr<lua_module> get_module(rage::joaat_t module_id);
+		const std::vector<std::shared_ptr<lua_module>>& get_modules();
+		void reload_all_modules();
+		void handle_error(const sol::error& error, const sol::state_view& state);
+
+		template<template_str hash_str, typename Return = void, typename... Args>
+		inline std::conditional_t<std::is_void_v<Return>, void, std::optional<Return>> trigger_event(Args&&... args)
+		{
+			constexpr auto hash = rage::joaat(hash_str.value);
+
+			for (auto& modules : get_modules())
+			{
+				if (auto vec = modules->m_event_callbacks.find(hash); vec != modules->m_event_callbacks.end())
+				{
+					for (auto& cb : vec->second)
+					{
+						auto result = cb(args...);
+
+						if (!result.valid())
+						{
+							handle_error(result, result.lua_state());
+							continue;
+						}
+
+						if constexpr (!std::is_void_v<Return>)
+						{
+							if (result.return_count() == 0)
+								continue;
+
+							if (!result[0].is<Return>())
+								continue;
+
+							return result[0].get<Return>();
+						}
+					}
+				}
+			}
+
+			if constexpr (!std::is_void_v<Return>)
+				return std::nullopt;
+		}
+
+	private:
+		void load_all_modules();
+		void unload_all_modules();
+
+		std::vector<std::shared_ptr<lua_module>> m_modules;
+	};
+
+	inline lua_manager* g_lua_manager;
+}