Restructuring (#365)

* Remove launcher proxy

* Restructuring

* More restructuring

* Fix include dirs

* Fix merge

* Remove clang thing

* Filters

* Oops

6 files changed, 1216 insertions, 0 deletions

diff --git a/NorthstarDLL/mods/compiled/kb_act.cpp b/NorthstarDLL/mods/compiled/kb_act.cpp
new file mode 100644
index 00000000..4a011dc7
--- /dev/null
+++ b/NorthstarDLL/mods/compiled/kb_act.cpp
@@ -0,0 +1,45 @@
+#include "pch.h"
+#include "mods/modmanager.h"
+#include "core/filesystem/filesystem.h"
+
+#include <fstream>
+
+const char* KB_ACT_PATH = "scripts\\kb_act.lst";
+
+// compiles the file kb_act.lst, that defines entries for keybindings in the options menu
+void ModManager::BuildKBActionsList()
+{
+	spdlog::info("Building kb_act.lst");
+
+	fs::create_directories(GetCompiledAssetsPath() / "scripts");
+	std::ofstream soCompiledKeys(GetCompiledAssetsPath() / KB_ACT_PATH, std::ios::binary);
+
+	// write vanilla file's content to compiled file
+	soCompiledKeys << R2::ReadVPKOriginalFile(KB_ACT_PATH);
+
+	for (Mod& mod : m_LoadedMods)
+	{
+		if (!mod.m_bEnabled)
+			continue;
+
+		// write content of each modded file to compiled file
+		std::ifstream siModKeys(mod.m_ModDirectory / "kb_act.lst");
+
+		if (siModKeys.good())
+			soCompiledKeys << siModKeys.rdbuf() << std::endl;
+
+		siModKeys.close();
+	}
+
+	soCompiledKeys.close();
+
+	// push to overrides
+	ModOverrideFile overrideFile;
+	overrideFile.m_pOwningMod = nullptr;
+	overrideFile.m_Path = KB_ACT_PATH;
+
+	if (m_ModFiles.find(KB_ACT_PATH) == m_ModFiles.end())
+		m_ModFiles.insert(std::make_pair(KB_ACT_PATH, overrideFile));
+	else
+		m_ModFiles[KB_ACT_PATH] = overrideFile;
+}
diff --git a/NorthstarDLL/mods/compiled/modkeyvalues.cpp b/NorthstarDLL/mods/compiled/modkeyvalues.cpp
new file mode 100644
index 00000000..774be0eb
--- /dev/null
+++ b/NorthstarDLL/mods/compiled/modkeyvalues.cpp
@@ -0,0 +1,107 @@
+#include "pch.h"
+#include "mods/modmanager.h"
+#include "core/filesystem/filesystem.h"
+
+#include <fstream>
+
+AUTOHOOK_INIT()
+
+void ModManager::TryBuildKeyValues(const char* filename)
+{
+	spdlog::info("Building KeyValues for file {}", filename);
+
+	std::string normalisedPath = g_pModManager->NormaliseModFilePath(fs::path(filename));
+	fs::path compiledPath = GetCompiledAssetsPath() / filename;
+	fs::path compiledDir = compiledPath.parent_path();
+	fs::create_directories(compiledDir);
+
+	fs::path kvPath(filename);
+	std::string ogFilePath = "mod_original_";
+	ogFilePath += kvPath.filename().string();
+
+	std::string newKvs = "// AUTOGENERATED: MOD PATCH KV\n";
+
+	int patchNum = 0;
+
+	// copy over patch kv files, and add #bases to new file, last mods' patches should be applied first
+	// note: #include should be identical but it's actually just broken, thanks respawn
+	for (int64_t i = m_LoadedMods.size() - 1; i > -1; i--)
+	{
+		if (!m_LoadedMods[i].m_bEnabled)
+			continue;
+
+		size_t fileHash = STR_HASH(normalisedPath);
+		auto modKv = m_LoadedMods[i].KeyValues.find(fileHash);
+		if (modKv != m_LoadedMods[i].KeyValues.end())
+		{
+			// should result in smth along the lines of #include "mod_patch_5_mp_weapon_car.txt"
+
+			std::string patchFilePath = "mod_patch_";
+			patchFilePath += std::to_string(patchNum++);
+			patchFilePath += "_";
+			patchFilePath += kvPath.filename().string();
+
+			newKvs += "#base \"";
+			newKvs += patchFilePath;
+			newKvs += "\"\n";
+
+			fs::remove(compiledDir / patchFilePath);
+
+			fs::copy_file(m_LoadedMods[i].m_ModDirectory / "keyvalues" / filename, compiledDir / patchFilePath);
+		}
+	}
+
+	// add original #base last, #bases don't override preexisting keys, including the ones we've just done
+	newKvs += "#base \"";
+	newKvs += ogFilePath;
+	newKvs += "\"\n";
+
+	// load original file, so we can parse out the name of the root obj (e.g. WeaponData for weapons)
+	std::string originalFile = R2::ReadVPKOriginalFile(filename);
+
+	if (!originalFile.length())
+	{
+		spdlog::warn("Tried to patch kv {} but no base kv was found!", ogFilePath);
+		return;
+	}
+
+	char rootName[64];
+	memset(rootName, 0, sizeof(rootName));
+
+	// iterate until we hit an ascii char that isn't in a # command or comment to get root obj name
+	int i = 0;
+	while (!(originalFile[i] >= 65 && originalFile[i] <= 122))
+	{
+		// if we hit a comment or # thing, iterate until end of line
+		if (originalFile[i] == '/' || originalFile[i] == '#')
+			while (originalFile[i] != '\n')
+				i++;
+
+		i++;
+	}
+
+	int j = 0;
+	for (int j = 0; originalFile[i] >= 65 && originalFile[i] <= 122; j++)
+		rootName[j] = originalFile[i++];
+
+	// empty kv, all the other stuff gets #base'd
+	newKvs += rootName;
+	newKvs += "\n{\n}\n";
+
+	std::ofstream originalFileWriteStream(compiledDir / ogFilePath, std::ios::binary);
+	originalFileWriteStream << originalFile;
+	originalFileWriteStream.close();
+
+	std::ofstream writeStream(compiledPath, std::ios::binary);
+	writeStream << newKvs;
+	writeStream.close();
+
+	ModOverrideFile overrideFile;
+	overrideFile.m_pOwningMod = nullptr;
+	overrideFile.m_Path = normalisedPath;
+
+	if (m_ModFiles.find(normalisedPath) == m_ModFiles.end())
+		m_ModFiles.insert(std::make_pair(normalisedPath, overrideFile));
+	else
+		m_ModFiles[normalisedPath] = overrideFile;
+}
diff --git a/NorthstarDLL/mods/compiled/modpdef.cpp b/NorthstarDLL/mods/compiled/modpdef.cpp
new file mode 100644
index 00000000..219c744b
--- /dev/null
+++ b/NorthstarDLL/mods/compiled/modpdef.cpp
@@ -0,0 +1,119 @@
+#include "pch.h"
+#include "mods/modmanager.h"
+#include "core/filesystem/filesystem.h"
+
+#include <map>
+#include <sstream>
+#include <fstream>
+
+const fs::path MOD_PDEF_SUFFIX = "cfg/server/persistent_player_data_version_231.pdef";
+const char* VPK_PDEF_PATH = "cfg/server/persistent_player_data_version_231.pdef";
+
+void ModManager::BuildPdef()
+{
+	spdlog::info("Building persistent_player_data_version_231.pdef...");
+
+	fs::path MOD_PDEF_PATH = fs::path(GetCompiledAssetsPath() / MOD_PDEF_SUFFIX);
+
+	fs::remove(MOD_PDEF_PATH);
+	std::string pdef = R2::ReadVPKOriginalFile(VPK_PDEF_PATH);
+
+	for (Mod& mod : m_LoadedMods)
+	{
+		if (!mod.m_bEnabled || !mod.Pdiff.size())
+			continue;
+
+		// this code probably isn't going to be pretty lol
+		// refer to shared/pjson.js for an actual okish parser of the pdiff format
+		// but pretty much, $ENUM_ADD blocks define members added to preexisting enums
+		// $PROP_START ends the custom stuff, and from there it's just normal props we append to the pdef
+
+		std::map<std::string, std::vector<std::string>> enumAdds;
+
+		// read pdiff
+		bool inEnum = false;
+		bool inProp = false;
+		std::string currentEnum;
+		std::string currentLine;
+		std::istringstream pdiffStream(mod.Pdiff);
+
+		while (std::getline(pdiffStream, currentLine))
+		{
+			if (inProp)
+			{
+				// just append to pdef here
+				pdef += currentLine;
+				pdef += '\n';
+				continue;
+			}
+
+			// trim leading whitespace
+			size_t start = currentLine.find_first_not_of(" \n\r\t\f\v");
+			size_t end = currentLine.find("//");
+			if (end == std::string::npos)
+				end = currentLine.size() - 1; // last char
+
+			if (!currentLine.size() || !currentLine.compare(start, 2, "//"))
+				continue;
+
+			if (inEnum)
+			{
+				if (!currentLine.compare(start, 9, "$ENUM_END"))
+					inEnum = false;
+				else
+					enumAdds[currentEnum].push_back(currentLine); // only need to push_back current line, if there's syntax errors then game
+																  // pdef parser will handle them
+			}
+			else if (!currentLine.compare(start, 9, "$ENUM_ADD"))
+			{
+				inEnum = true;
+				currentEnum = currentLine.substr(start + 10 /*$ENUM_ADD + 1*/, currentLine.size() - end - (start + 10));
+				enumAdds.insert(std::make_pair(currentEnum, std::vector<std::string>()));
+			}
+			else if (!currentLine.compare(start, 11, "$PROP_START"))
+			{
+				inProp = true;
+				pdef += "\n// $PROP_START ";
+				pdef += mod.Name;
+				pdef += "\n";
+			}
+		}
+
+		// add new members to preexisting enums
+		// note: this code could 100% be messed up if people put //$ENUM_START comments and the like
+		// could make it protect against this, but honestly not worth atm
+		for (auto enumAdd : enumAdds)
+		{
+			std::string addStr;
+			for (std::string enumMember : enumAdd.second)
+			{
+				addStr += enumMember;
+				addStr += '\n';
+			}
+
+			// start of enum we're adding to
+			std::string startStr = "$ENUM_START ";
+			startStr += enumAdd.first;
+
+			// insert enum values into enum
+			size_t insertIdx = pdef.find("$ENUM_END", pdef.find(startStr));
+			pdef.reserve(addStr.size());
+			pdef.insert(insertIdx, addStr);
+		}
+	}
+
+	fs::create_directories(MOD_PDEF_PATH.parent_path());
+
+	std::ofstream writeStream(MOD_PDEF_PATH, std::ios::binary);
+	writeStream << pdef;
+	writeStream.close();
+
+	ModOverrideFile overrideFile;
+	overrideFile.m_pOwningMod = nullptr;
+	overrideFile.m_Path = VPK_PDEF_PATH;
+
+	if (m_ModFiles.find(VPK_PDEF_PATH) == m_ModFiles.end())
+		m_ModFiles.insert(std::make_pair(VPK_PDEF_PATH, overrideFile));
+	else
+		m_ModFiles[VPK_PDEF_PATH] = overrideFile;
+}
diff --git a/NorthstarDLL/mods/compiled/modscriptsrson.cpp b/NorthstarDLL/mods/compiled/modscriptsrson.cpp
new file mode 100644
index 00000000..15fcdd13
--- /dev/null
+++ b/NorthstarDLL/mods/compiled/modscriptsrson.cpp
@@ -0,0 +1,66 @@
+#include "pch.h"
+#include "mods/modmanager.h"
+#include "core/filesystem/filesystem.h"
+#include "squirrel/squirrel.h"
+
+#include <fstream>
+
+const std::string MOD_SCRIPTS_RSON_SUFFIX = "scripts/vscripts/scripts.rson";
+const char* VPK_SCRIPTS_RSON_PATH = "scripts\\vscripts\\scripts.rson";
+
+void ModManager::BuildScriptsRson()
+{
+	spdlog::info("Building custom scripts.rson");
+	fs::path MOD_SCRIPTS_RSON_PATH = fs::path(GetCompiledAssetsPath() / MOD_SCRIPTS_RSON_SUFFIX);
+	fs::remove(MOD_SCRIPTS_RSON_PATH);
+
+	std::string scriptsRson = R2::ReadVPKOriginalFile(VPK_SCRIPTS_RSON_PATH);
+	scriptsRson += "\n\n// START MODDED SCRIPT CONTENT\n\n"; // newline before we start custom stuff
+
+	for (Mod& mod : m_LoadedMods)
+	{
+		if (!mod.m_bEnabled)
+			continue;
+
+		// this isn't needed at all, just nice to have imo
+		scriptsRson += "// MOD: ";
+		scriptsRson += mod.Name;
+		scriptsRson += ":\n\n";
+
+		for (ModScript& script : mod.Scripts)
+		{
+			/* should create something with this format for each script
+			When: "CONTEXT"
+			Scripts:
+			[
+				_coolscript.gnut
+			]*/
+
+			scriptsRson += "When: \"";
+			scriptsRson += script.RunOn;
+			scriptsRson += "\"\n";
+
+			scriptsRson += "Scripts:\n[\n\t";
+			scriptsRson += script.Path;
+			scriptsRson += "\n]\n\n";
+		}
+	}
+
+	fs::create_directories(MOD_SCRIPTS_RSON_PATH.parent_path());
+
+	std::ofstream writeStream(MOD_SCRIPTS_RSON_PATH, std::ios::binary);
+	writeStream << scriptsRson;
+	writeStream.close();
+
+	ModOverrideFile overrideFile;
+	overrideFile.m_pOwningMod = nullptr;
+	overrideFile.m_Path = VPK_SCRIPTS_RSON_PATH;
+
+	if (m_ModFiles.find(VPK_SCRIPTS_RSON_PATH) == m_ModFiles.end())
+		m_ModFiles.insert(std::make_pair(VPK_SCRIPTS_RSON_PATH, overrideFile));
+	else
+		m_ModFiles[VPK_SCRIPTS_RSON_PATH] = overrideFile;
+
+	// todo: for preventing dupe scripts in scripts.rson, we could actually parse when conditions with the squirrel vm, just need a way to
+	// get a result out of squirrelmanager.ExecuteCode this would probably be the best way to do this, imo
+}
diff --git a/NorthstarDLL/mods/modmanager.cpp b/NorthstarDLL/mods/modmanager.cpp
new file mode 100644
index 00000000..2196b118
--- /dev/null
+++ b/NorthstarDLL/mods/modmanager.cpp
@@ -0,0 +1,725 @@
+#include "pch.h"
+#include "modmanager.h"
+#include "core/convar/convar.h"
+#include "core/convar/concommand.h"
+#include "client/audio.h"
+#include "masterserver/masterserver.h"
+#include "core/filesystem/filesystem.h"
+#include "core/filesystem/rpakfilesystem.h"
+#include "config/profile.h"
+
+#include "rapidjson/error/en.h"
+#include "rapidjson/document.h"
+#include "rapidjson/ostreamwrapper.h"
+#include "rapidjson/writer.h"
+#include <filesystem>
+#include <fstream>
+#include <string>
+#include <sstream>
+#include <vector>
+
+ModManager* g_pModManager;
+
+Mod::Mod(fs::path modDir, char* jsonBuf)
+{
+	m_bWasReadSuccessfully = false;
+
+	m_ModDirectory = modDir;
+
+	rapidjson_document modJson;
+	modJson.Parse<rapidjson::ParseFlag::kParseCommentsFlag | rapidjson::ParseFlag::kParseTrailingCommasFlag>(jsonBuf);
+
+	// fail if parse error
+	if (modJson.HasParseError())
+	{
+		spdlog::error(
+			"Failed reading mod file {}: encountered parse error \"{}\" at offset {}",
+			(modDir / "mod.json").string(),
+			GetParseError_En(modJson.GetParseError()),
+			modJson.GetErrorOffset());
+		return;
+	}
+
+	// fail if it's not a json obj (could be an array, string, etc)
+	if (!modJson.IsObject())
+	{
+		spdlog::error("Failed reading mod file {}: file is not a JSON object", (modDir / "mod.json").string());
+		return;
+	}
+
+	// basic mod info
+	// name is required
+	if (!modJson.HasMember("Name"))
+	{
+		spdlog::error("Failed reading mod file {}: missing required member \"Name\"", (modDir / "mod.json").string());
+		return;
+	}
+
+	Name = modJson["Name"].GetString();
+
+	if (modJson.HasMember("Description"))
+		Description = modJson["Description"].GetString();
+	else
+		Description = "";
+
+	if (modJson.HasMember("Version"))
+		Version = modJson["Version"].GetString();
+	else
+	{
+		Version = "0.0.0";
+		spdlog::warn("Mod file {} is missing a version, consider adding a version", (modDir / "mod.json").string());
+	}
+
+	if (modJson.HasMember("DownloadLink"))
+		DownloadLink = modJson["DownloadLink"].GetString();
+	else
+		DownloadLink = "";
+
+	if (modJson.HasMember("RequiredOnClient"))
+		RequiredOnClient = modJson["RequiredOnClient"].GetBool();
+	else
+		RequiredOnClient = false;
+
+	if (modJson.HasMember("LoadPriority"))
+		LoadPriority = modJson["LoadPriority"].GetInt();
+	else
+	{
+		spdlog::info("Mod file {} is missing a LoadPriority, consider adding one", (modDir / "mod.json").string());
+		LoadPriority = 0;
+	}
+
+	// mod convars
+	if (modJson.HasMember("ConVars") && modJson["ConVars"].IsArray())
+	{
+		for (auto& convarObj : modJson["ConVars"].GetArray())
+		{
+			if (!convarObj.IsObject() || !convarObj.HasMember("Name") || !convarObj.HasMember("DefaultValue"))
+				continue;
+
+			// have to allocate this manually, otherwise convar registration will break
+			// unfortunately this causes us to leak memory on reload, unsure of a way around this rn
+			ModConVar* convar = new ModConVar;
+			convar->Name = convarObj["Name"].GetString();
+			convar->DefaultValue = convarObj["DefaultValue"].GetString();
+
+			if (convarObj.HasMember("HelpString"))
+				convar->HelpString = convarObj["HelpString"].GetString();
+			else
+				convar->HelpString = "";
+
+			convar->Flags = FCVAR_NONE;
+
+			if (convarObj.HasMember("Flags"))
+			{
+				// read raw integer flags
+				if (convarObj["Flags"].IsInt())
+					convar->Flags = convarObj["Flags"].GetInt();
+				else if (convarObj["Flags"].IsString())
+				{
+					// parse cvar flags from string
+					// example string: ARCHIVE_PLAYERPROFILE | GAMEDLL
+
+					std::string sFlags = convarObj["Flags"].GetString();
+					sFlags += '|'; // add additional | so we register the last flag
+					std::string sCurrentFlag;
+
+					for (int i = 0; i < sFlags.length(); i++)
+					{
+						if (isspace(sFlags[i]))
+							continue;
+
+						// if we encounter a |, add current string as a flag
+						if (sFlags[i] == '|')
+						{
+							bool bHasFlags = false;
+							int iCurrentFlags;
+
+							for (auto& flagPair : g_PrintCommandFlags)
+							{
+								if (!sCurrentFlag.compare(flagPair.second))
+								{
+									iCurrentFlags = flagPair.first;
+									bHasFlags = true;
+									break;
+								}
+							}
+
+							if (bHasFlags)
+								convar->Flags |= iCurrentFlags;
+							else
+								spdlog::warn("Mod ConVar {} has unknown flag {}", convar->Name, sCurrentFlag);
+
+							sCurrentFlag = "";
+						}
+						else
+							sCurrentFlag += sFlags[i];
+					}
+				}
+			}
+
+			ConVars.push_back(convar);
+		}
+	}
+
+	// mod scripts
+	if (modJson.HasMember("Scripts") && modJson["Scripts"].IsArray())
+	{
+		for (auto& scriptObj : modJson["Scripts"].GetArray())
+		{
+			if (!scriptObj.IsObject() || !scriptObj.HasMember("Path") || !scriptObj.HasMember("RunOn"))
+				continue;
+
+			ModScript script;
+
+			script.Path = scriptObj["Path"].GetString();
+			script.RunOn = scriptObj["RunOn"].GetString();
+
+			if (scriptObj.HasMember("ServerCallback") && scriptObj["ServerCallback"].IsObject())
+			{
+				ModScriptCallback callback;
+				callback.Context = ScriptContext::SERVER;
+
+				if (scriptObj["ServerCallback"].HasMember("Before") && scriptObj["ServerCallback"]["Before"].IsString())
+					callback.BeforeCallback = scriptObj["ServerCallback"]["Before"].GetString();
+
+				if (scriptObj["ServerCallback"].HasMember("After") && scriptObj["ServerCallback"]["After"].IsString())
+					callback.AfterCallback = scriptObj["ServerCallback"]["After"].GetString();
+
+				script.Callbacks.push_back(callback);
+			}
+
+			if (scriptObj.HasMember("ClientCallback") && scriptObj["ClientCallback"].IsObject())
+			{
+				ModScriptCallback callback;
+				callback.Context = ScriptContext::CLIENT;
+
+				if (scriptObj["ClientCallback"].HasMember("Before") && scriptObj["ClientCallback"]["Before"].IsString())
+					callback.BeforeCallback = scriptObj["ClientCallback"]["Before"].GetString();
+
+				if (scriptObj["ClientCallback"].HasMember("After") && scriptObj["ClientCallback"]["After"].IsString())
+					callback.AfterCallback = scriptObj["ClientCallback"]["After"].GetString();
+
+				script.Callbacks.push_back(callback);
+			}
+
+			if (scriptObj.HasMember("UICallback") && scriptObj["UICallback"].IsObject())
+			{
+				ModScriptCallback callback;
+				callback.Context = ScriptContext::UI;
+
+				if (scriptObj["UICallback"].HasMember("Before") && scriptObj["UICallback"]["Before"].IsString())
+					callback.BeforeCallback = scriptObj["UICallback"]["Before"].GetString();
+
+				if (scriptObj["UICallback"].HasMember("After") && scriptObj["UICallback"]["After"].IsString())
+					callback.AfterCallback = scriptObj["UICallback"]["After"].GetString();
+
+				script.Callbacks.push_back(callback);
+			}
+
+			Scripts.push_back(script);
+		}
+	}
+
+	if (modJson.HasMember("Localisation") && modJson["Localisation"].IsArray())
+	{
+		for (auto& localisationStr : modJson["Localisation"].GetArray())
+		{
+			if (!localisationStr.IsString())
+				continue;
+
+			LocalisationFiles.push_back(localisationStr.GetString());
+		}
+	}
+
+	if (modJson.HasMember("Dependencies") && modJson["Dependencies"].IsObject())
+	{
+		for (auto v = modJson["Dependencies"].MemberBegin(); v != modJson["Dependencies"].MemberEnd(); v++)
+		{
+			if (!v->name.IsString() || !v->value.IsString())
+				continue;
+
+			spdlog::info("Constant {} defined by {} for mod {}", v->name.GetString(), Name, v->value.GetString());
+			if (DependencyConstants.find(v->name.GetString()) != DependencyConstants.end() &&
+				v->value.GetString() != DependencyConstants[v->name.GetString()])
+			{
+				spdlog::error("A dependency constant with the same name already exists for another mod. Change the constant name.");
+				return;
+			}
+
+			if (DependencyConstants.find(v->name.GetString()) == DependencyConstants.end())
+				DependencyConstants.emplace(v->name.GetString(), v->value.GetString());
+		}
+	}
+
+	m_bWasReadSuccessfully = true;
+}
+
+ModManager::ModManager()
+{
+	// precaculated string hashes
+	// note: use backslashes for these, since we use lexically_normal for file paths which uses them
+	m_hScriptsRsonHash = STR_HASH("scripts\\vscripts\\scripts.rson");
+	m_hPdefHash = STR_HASH(
+		"cfg\\server\\persistent_player_data_version_231.pdef" // this can have multiple versions, but we use 231 so that's what we hash
+	);
+	m_hKBActHash = STR_HASH("scripts\\kb_act.lst");
+
+	LoadMods();
+}
+
+void ModManager::LoadMods()
+{
+	if (m_bHasLoadedMods)
+		UnloadMods();
+
+	std::vector<fs::path> modDirs;
+
+	// ensure dirs exist
+	fs::remove_all(GetCompiledAssetsPath());
+	fs::create_directories(GetModFolderPath());
+
+	m_DependencyConstants.clear();
+
+	// read enabled mods cfg
+	std::ifstream enabledModsStream(GetNorthstarPrefix() + "/enabledmods.json");
+	std::stringstream enabledModsStringStream;
+
+	if (!enabledModsStream.fail())
+	{
+		while (enabledModsStream.peek() != EOF)
+			enabledModsStringStream << (char)enabledModsStream.get();
+
+		enabledModsStream.close();
+		m_EnabledModsCfg.Parse<rapidjson::ParseFlag::kParseCommentsFlag | rapidjson::ParseFlag::kParseTrailingCommasFlag>(
+			enabledModsStringStream.str().c_str());
+
+		m_bHasEnabledModsCfg = m_EnabledModsCfg.IsObject();
+	}
+
+	// get mod directories
+	for (fs::directory_entry dir : fs::directory_iterator(GetModFolderPath()))
+		if (fs::exists(dir.path() / "mod.json"))
+			modDirs.push_back(dir.path());
+
+	for (fs::path modDir : modDirs)
+	{
+		// read mod json file
+		std::ifstream jsonStream(modDir / "mod.json");
+		std::stringstream jsonStringStream;
+
+		// fail if no mod json
+		if (jsonStream.fail())
+		{
+			spdlog::warn("Mod {} has a directory but no mod.json", modDir.string());
+			continue;
+		}
+
+		while (jsonStream.peek() != EOF)
+			jsonStringStream << (char)jsonStream.get();
+
+		jsonStream.close();
+
+		Mod mod(modDir, (char*)jsonStringStream.str().c_str());
+
+		for (auto& pair : mod.DependencyConstants)
+		{
+			if (m_DependencyConstants.find(pair.first) != m_DependencyConstants.end() && m_DependencyConstants[pair.first] != pair.second)
+			{
+				spdlog::error("Constant {} in mod {} already exists in another mod.", pair.first, mod.Name);
+				mod.m_bWasReadSuccessfully = false;
+				break;
+			}
+			if (m_DependencyConstants.find(pair.first) == m_DependencyConstants.end())
+				m_DependencyConstants.emplace(pair);
+		}
+
+		if (m_bHasEnabledModsCfg && m_EnabledModsCfg.HasMember(mod.Name.c_str()))
+			mod.m_bEnabled = m_EnabledModsCfg[mod.Name.c_str()].IsTrue();
+		else
+			mod.m_bEnabled = true;
+
+		if (mod.m_bWasReadSuccessfully)
+		{
+			spdlog::info("Loaded mod {} successfully", mod.Name);
+			if (mod.m_bEnabled)
+				spdlog::info("Mod {} is enabled", mod.Name);
+			else
+				spdlog::info("Mod {} is disabled", mod.Name);
+
+			m_LoadedMods.push_back(mod);
+		}
+		else
+			spdlog::warn("Skipping loading mod file {}", (modDir / "mod.json").string());
+	}
+
+	// sort by load prio, lowest-highest
+	std::sort(m_LoadedMods.begin(), m_LoadedMods.end(), [](Mod& a, Mod& b) { return a.LoadPriority < b.LoadPriority; });
+
+	for (Mod& mod : m_LoadedMods)
+	{
+		if (!mod.m_bEnabled)
+			continue;
+
+		// register convars
+		// for reloads, this is sorta barebones, when we have a good findconvar method, we could probably reset flags and stuff on
+		// preexisting convars note: we don't delete convars if they already exist because they're used for script stuff, unfortunately this
+		// causes us to leak memory on reload, but not much, potentially find a way to not do this at some point
+		for (ModConVar* convar : mod.ConVars)
+			if (!R2::g_pCVar->FindVar(convar->Name.c_str())) // make sure convar isn't registered yet, unsure if necessary but idk what
+															 // behaviour is for defining same convar multiple times
+				new ConVar(convar->Name.c_str(), convar->DefaultValue.c_str(), convar->Flags, convar->HelpString.c_str());
+
+		// read vpk paths
+		if (fs::exists(mod.m_ModDirectory / "vpk"))
+		{
+			// read vpk cfg
+			std::ifstream vpkJsonStream(mod.m_ModDirectory / "vpk/vpk.json");
+			std::stringstream vpkJsonStringStream;
+
+			bool bUseVPKJson = false;
+			rapidjson::Document dVpkJson;
+
+			if (!vpkJsonStream.fail())
+			{
+				while (vpkJsonStream.peek() != EOF)
+					vpkJsonStringStream << (char)vpkJsonStream.get();
+
+				vpkJsonStream.close();
+				dVpkJson.Parse<rapidjson::ParseFlag::kParseCommentsFlag | rapidjson::ParseFlag::kParseTrailingCommasFlag>(
+					vpkJsonStringStream.str().c_str());
+
+				bUseVPKJson = !dVpkJson.HasParseError() && dVpkJson.IsObject();
+			}
+
+			for (fs::directory_entry file : fs::directory_iterator(mod.m_ModDirectory / "vpk"))
+			{
+				// a bunch of checks to make sure we're only adding dir vpks and their paths are good
+				// note: the game will literally only load vpks with the english prefix
+				if (fs::is_regular_file(file) && file.path().extension() == ".vpk" &&
+					file.path().string().find("english") != std::string::npos &&
+					file.path().string().find(".bsp.pak000_dir") != std::string::npos)
+				{
+					std::string formattedPath = file.path().filename().string();
+
+					// this really fucking sucks but it'll work
+					std::string vpkName = formattedPath.substr(strlen("english"), formattedPath.find(".bsp") - 3);
+
+					ModVPKEntry& modVpk = mod.Vpks.emplace_back();
+					modVpk.m_bAutoLoad = !bUseVPKJson || (dVpkJson.HasMember("Preload") && dVpkJson["Preload"].IsObject() &&
+														  dVpkJson["Preload"].HasMember(vpkName) && dVpkJson["Preload"][vpkName].IsTrue());
+					modVpk.m_sVpkPath = (file.path().parent_path() / vpkName).string();
+
+					if (m_bHasLoadedMods && modVpk.m_bAutoLoad)
+						(*R2::g_pFilesystem)->m_vtable->MountVPK(*R2::g_pFilesystem, vpkName.c_str());
+				}
+			}
+		}
+
+		// read rpak paths
+		if (fs::exists(mod.m_ModDirectory / "paks"))
+		{
+			// read rpak cfg
+			std::ifstream rpakJsonStream(mod.m_ModDirectory / "paks/rpak.json");
+			std::stringstream rpakJsonStringStream;
+
+			bool bUseRpakJson = false;
+			rapidjson::Document dRpakJson;
+
+			if (!rpakJsonStream.fail())
+			{
+				while (rpakJsonStream.peek() != EOF)
+					rpakJsonStringStream << (char)rpakJsonStream.get();
+
+				rpakJsonStream.close();
+				dRpakJson.Parse<rapidjson::ParseFlag::kParseCommentsFlag | rapidjson::ParseFlag::kParseTrailingCommasFlag>(
+					rpakJsonStringStream.str().c_str());
+
+				bUseRpakJson = !dRpakJson.HasParseError() && dRpakJson.IsObject();
+			}
+
+			// read pak aliases
+			if (bUseRpakJson && dRpakJson.HasMember("Aliases") && dRpakJson["Aliases"].IsObject())
+			{
+				for (rapidjson::Value::ConstMemberIterator iterator = dRpakJson["Aliases"].MemberBegin();
+					 iterator != dRpakJson["Aliases"].MemberEnd();
+					 iterator++)
+				{
+					if (!iterator->name.IsString() || !iterator->value.IsString())
+						continue;
+
+					mod.RpakAliases.insert(std::make_pair(iterator->name.GetString(), iterator->value.GetString()));
+				}
+			}
+
+			for (fs::directory_entry file : fs::directory_iterator(mod.m_ModDirectory / "paks"))
+			{
+				// ensure we're only loading rpaks
+				if (fs::is_regular_file(file) && file.path().extension() == ".rpak")
+				{
+					std::string pakName(file.path().filename().string());
+
+					ModRpakEntry& modPak = mod.Rpaks.emplace_back();
+					modPak.m_bAutoLoad =
+						!bUseRpakJson || (dRpakJson.HasMember("Preload") && dRpakJson["Preload"].IsObject() &&
+										  dRpakJson["Preload"].HasMember(pakName) && dRpakJson["Preload"][pakName].IsTrue());
+
+					// postload things
+					if (!bUseRpakJson ||
+						(dRpakJson.HasMember("Postload") && dRpakJson["Postload"].IsObject() && dRpakJson["Postload"].HasMember(pakName)))
+						modPak.m_sLoadAfterPak = dRpakJson["Postload"][pakName].GetString();
+
+					modPak.m_sPakName = pakName;
+
+					// read header of file and get the starpak paths
+					// this is done here as opposed to on starpak load because multiple rpaks can load a starpak
+					// and there is seemingly no good way to tell which rpak is causing the load of a starpak :/
+
+					std::ifstream rpakStream(file.path(), std::ios::binary);
+
+					// seek to the point in the header where the starpak reference size is
+					rpakStream.seekg(0x38, std::ios::beg);
+					int starpaksSize = 0;
+					rpakStream.read((char*)&starpaksSize, 2);
+
+					// seek to just after the header
+					rpakStream.seekg(0x58, std::ios::beg);
+					// read the starpak reference(s)
+					std::vector<char> buf(starpaksSize);
+					rpakStream.read(buf.data(), starpaksSize);
+
+					rpakStream.close();
+
+					// split the starpak reference(s) into strings to hash
+					std::string str = "";
+					for (int i = 0; i < starpaksSize; i++)
+					{
+						// if the current char is null, that signals the end of the current starpak path
+						if (buf[i] != 0x00)
+						{
+							str += buf[i];
+						}
+						else
+						{
+							// only add the string we are making if it isnt empty
+							if (!str.empty())
+							{
+								mod.StarpakPaths.push_back(STR_HASH(str));
+								spdlog::info("Mod {} registered starpak '{}'", mod.Name, str);
+								str = "";
+							}
+						}
+					}
+
+					// not using atm because we need to resolve path to rpak
+					// if (m_hasLoadedMods && modPak.m_bAutoLoad)
+					//	g_pPakLoadManager->LoadPakAsync(pakName.c_str());
+				}
+			}
+		}
+
+		// read keyvalues paths
+		if (fs::exists(mod.m_ModDirectory / "keyvalues"))
+		{
+			for (fs::directory_entry file : fs::recursive_directory_iterator(mod.m_ModDirectory / "keyvalues"))
+			{
+				if (fs::is_regular_file(file))
+				{
+					std::string kvStr =
+						g_pModManager->NormaliseModFilePath(file.path().lexically_relative(mod.m_ModDirectory / "keyvalues"));
+					mod.KeyValues.emplace(STR_HASH(kvStr), kvStr);
+				}
+			}
+		}
+
+		// read pdiff
+		if (fs::exists(mod.m_ModDirectory / "mod.pdiff"))
+		{
+			std::ifstream pdiffStream(mod.m_ModDirectory / "mod.pdiff");
+
+			if (!pdiffStream.fail())
+			{
+				std::stringstream pdiffStringStream;
+				while (pdiffStream.peek() != EOF)
+					pdiffStringStream << (char)pdiffStream.get();
+
+				pdiffStream.close();
+
+				mod.Pdiff = pdiffStringStream.str();
+			}
+		}
+
+		// read bink video paths
+		if (fs::exists(mod.m_ModDirectory / "media"))
+		{
+			for (fs::directory_entry file : fs::recursive_directory_iterator(mod.m_ModDirectory / "media"))
+				if (fs::is_regular_file(file) && file.path().extension() == ".bik")
+					mod.BinkVideos.push_back(file.path().filename().string());
+		}
+
+		// try to load audio
+		if (fs::exists(mod.m_ModDirectory / "audio"))
+		{
+			for (fs::directory_entry file : fs::directory_iterator(mod.m_ModDirectory / "audio"))
+			{
+				if (fs::is_regular_file(file) && file.path().extension().string() == ".json")
+				{
+					if (!g_CustomAudioManager.TryLoadAudioOverride(file.path()))
+					{
+						spdlog::warn("Mod {} has an invalid audio def {}", mod.Name, file.path().filename().string());
+						continue;
+					}
+				}
+			}
+		}
+	}
+
+	// in a seperate loop because we register mod files in reverse order, since mods loaded later should have their files prioritised
+	for (int64_t i = m_LoadedMods.size() - 1; i > -1; i--)
+	{
+		if (!m_LoadedMods[i].m_bEnabled)
+			continue;
+
+		if (fs::exists(m_LoadedMods[i].m_ModDirectory / MOD_OVERRIDE_DIR))
+		{
+			for (fs::directory_entry file : fs::recursive_directory_iterator(m_LoadedMods[i].m_ModDirectory / MOD_OVERRIDE_DIR))
+			{
+				std::string path =
+					g_pModManager->NormaliseModFilePath(file.path().lexically_relative(m_LoadedMods[i].m_ModDirectory / MOD_OVERRIDE_DIR));
+				if (file.is_regular_file() && m_ModFiles.find(path) == m_ModFiles.end())
+				{
+					ModOverrideFile modFile;
+					modFile.m_pOwningMod = &m_LoadedMods[i];
+					modFile.m_Path = path;
+					m_ModFiles.insert(std::make_pair(path, modFile));
+				}
+			}
+		}
+	}
+
+	// build modinfo obj for masterserver
+	rapidjson_document modinfoDoc;
+	auto& alloc = modinfoDoc.GetAllocator();
+	modinfoDoc.SetObject();
+	modinfoDoc.AddMember("Mods", rapidjson::kArrayType, alloc);
+
+	int currentModIndex = 0;
+	for (Mod& mod : m_LoadedMods)
+	{
+		if (!mod.m_bEnabled || (!mod.RequiredOnClient && !mod.Pdiff.size()))
+			continue;
+
+		modinfoDoc["Mods"].PushBack(rapidjson::kObjectType, modinfoDoc.GetAllocator());
+		modinfoDoc["Mods"][currentModIndex].AddMember("Name", rapidjson::StringRef(&mod.Name[0]), modinfoDoc.GetAllocator());
+		modinfoDoc["Mods"][currentModIndex].AddMember("Version", rapidjson::StringRef(&mod.Version[0]), modinfoDoc.GetAllocator());
+		modinfoDoc["Mods"][currentModIndex].AddMember("RequiredOnClient", mod.RequiredOnClient, modinfoDoc.GetAllocator());
+		modinfoDoc["Mods"][currentModIndex].AddMember("Pdiff", rapidjson::StringRef(&mod.Pdiff[0]), modinfoDoc.GetAllocator());
+
+		currentModIndex++;
+	}
+
+	rapidjson::StringBuffer buffer;
+	buffer.Clear();
+	rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
+	modinfoDoc.Accept(writer);
+	g_pMasterServerManager->m_sOwnModInfoJson = std::string(buffer.GetString());
+
+	m_bHasLoadedMods = true;
+}
+
+void ModManager::UnloadMods()
+{
+	// clean up stuff from mods before we unload
+	m_ModFiles.clear();
+	fs::remove_all(GetCompiledAssetsPath());
+
+	g_CustomAudioManager.ClearAudioOverrides();
+
+	if (!m_bHasEnabledModsCfg)
+		m_EnabledModsCfg.SetObject();
+
+	for (Mod& mod : m_LoadedMods)
+	{
+		// remove all built kvs
+		for (std::pair<size_t, std::string> kvPaths : mod.KeyValues)
+			fs::remove(GetCompiledAssetsPath() / fs::path(kvPaths.second).lexically_relative(mod.m_ModDirectory));
+
+		mod.KeyValues.clear();
+
+		// write to m_enabledModsCfg
+		// should we be doing this here or should scripts be doing this manually?
+		// main issue with doing this here is when we reload mods for connecting to a server, we write enabled mods, which isn't necessarily
+		// what we wanna do
+		if (!m_EnabledModsCfg.HasMember(mod.Name.c_str()))
+			m_EnabledModsCfg.AddMember(rapidjson_document::StringRefType(mod.Name.c_str()), false, m_EnabledModsCfg.GetAllocator());
+
+		m_EnabledModsCfg[mod.Name.c_str()].SetBool(mod.m_bEnabled);
+	}
+
+	std::ofstream writeStream(GetNorthstarPrefix() + "/enabledmods.json");
+	rapidjson::OStreamWrapper writeStreamWrapper(writeStream);
+	rapidjson::Writer<rapidjson::OStreamWrapper> writer(writeStreamWrapper);
+	m_EnabledModsCfg.Accept(writer);
+
+	// do we need to dealloc individual entries in m_loadedMods? idk, rework
+	m_LoadedMods.clear();
+}
+
+std::string ModManager::NormaliseModFilePath(const fs::path path)
+{
+	std::string str = path.lexically_normal().string();
+
+	// force to lowercase
+	for (char& c : str)
+		if (c <= 'Z' && c >= 'A')
+			c = c - ('Z' - 'z');
+
+	return str;
+}
+
+void ModManager::CompileAssetsForFile(const char* filename)
+{
+	size_t fileHash = STR_HASH(NormaliseModFilePath(fs::path(filename)));
+
+	if (fileHash == m_hScriptsRsonHash)
+		BuildScriptsRson();
+	else if (fileHash == m_hPdefHash)
+		BuildPdef();
+	else if (fileHash == m_hKBActHash)
+		BuildKBActionsList();
+	else
+	{
+		// check if we should build keyvalues, depending on whether any of our mods have patch kvs for this file
+		for (Mod& mod : m_LoadedMods)
+		{
+			if (!mod.m_bEnabled)
+				continue;
+
+			if (mod.KeyValues.find(fileHash) != mod.KeyValues.end())
+			{
+				TryBuildKeyValues(filename);
+				return;
+			}
+		}
+	}
+}
+
+void ConCommand_reload_mods(const CCommand& args)
+{
+	g_pModManager->LoadMods();
+}
+
+fs::path GetModFolderPath()
+{
+	return fs::path(GetNorthstarPrefix() + MOD_FOLDER_SUFFIX);
+}
+fs::path GetCompiledAssetsPath()
+{
+	return fs::path(GetNorthstarPrefix() + COMPILED_ASSETS_SUFFIX);
+}
+
+ON_DLL_LOAD_RELIESON("engine.dll", ModManager, (ConCommand, MasterServer), (CModule module))
+{
+	g_pModManager = new ModManager;
+
+	RegisterConCommand("reload_mods", ConCommand_reload_mods, "reloads mods", FCVAR_NONE);
+}
diff --git a/NorthstarDLL/mods/modmanager.h b/NorthstarDLL/mods/modmanager.h
new file mode 100644
index 00000000..a77d85bd
--- /dev/null
+++ b/NorthstarDLL/mods/modmanager.h
@@ -0,0 +1,154 @@
+#pragma once
+#include "core/convar/convar.h"
+#include "core/memalloc.h"
+#include "squirrel/squirrel.h"
+
+#include "rapidjson/document.h"
+#include <string>
+#include <vector>
+#include <filesystem>
+
+const std::string MOD_FOLDER_SUFFIX = "/mods";
+const std::string REMOTE_MOD_FOLDER_SUFFIX = "/runtime/remote/mods";
+const fs::path MOD_OVERRIDE_DIR = "mod";
+const std::string COMPILED_ASSETS_SUFFIX = "/runtime/compiled";
+
+struct ModConVar
+{
+  public:
+	std::string Name;
+	std::string DefaultValue;
+	std::string HelpString;
+	int Flags;
+};
+
+struct ModScriptCallback
+{
+  public:
+	ScriptContext Context;
+
+	// called before the codecallback is executed
+	std::string BeforeCallback;
+	// called after the codecallback has finished executing
+	std::string AfterCallback;
+};
+
+struct ModScript
+{
+  public:
+	std::string Path;
+	std::string RunOn;
+
+	std::vector<ModScriptCallback> Callbacks;
+};
+
+// these are pretty much identical, could refactor to use the same stuff?
+struct ModVPKEntry
+{
+  public:
+	bool m_bAutoLoad;
+	std::string m_sVpkPath;
+};
+
+struct ModRpakEntry
+{
+  public:
+	bool m_bAutoLoad;
+	std::string m_sPakName;
+	std::string m_sLoadAfterPak;
+};
+
+class Mod
+{
+  public:
+	// runtime stuff
+	bool m_bEnabled = true;
+	bool m_bWasReadSuccessfully = false;
+	fs::path m_ModDirectory;
+	// bool m_bIsRemote;
+
+	// mod.json stuff:
+
+	// the mod's name
+	std::string Name;
+	// the mod's description
+	std::string Description;
+	// the mod's version, should be in semver
+	std::string Version;
+	// a download link to the mod, for clients that try to join without the mod
+	std::string DownloadLink;
+
+	// whether clients need the mod to join servers running this mod
+	bool RequiredOnClient;
+	// the priority for this mod's files, mods with prio 0 are loaded first, then 1, then 2, etc
+	int LoadPriority;
+
+	// custom scripts used by the mod
+	std::vector<ModScript> Scripts;
+	// convars created by the mod
+	std::vector<ModConVar*> ConVars;
+	// custom localisation files created by the mod
+	std::vector<std::string> LocalisationFiles;
+
+	// other files:
+
+	std::vector<ModVPKEntry> Vpks;
+	std::unordered_map<size_t, std::string> KeyValues;
+	std::vector<std::string> BinkVideos;
+	std::string Pdiff; // only need one per mod
+
+	std::vector<ModRpakEntry> Rpaks;
+	std::unordered_map<std::string, std::string>
+		RpakAliases; // paks we alias to other rpaks, e.g. to load sp_crashsite paks on the map mp_crashsite
+	std::vector<size_t> StarpakPaths; // starpaks that this mod contains
+	// there seems to be no nice way to get the rpak that is causing the load of a starpak?
+	// hashed with STR_HASH
+
+	std::unordered_map<std::string, std::string> DependencyConstants;
+
+  public:
+	Mod(fs::path modPath, char* jsonBuf);
+};
+
+struct ModOverrideFile
+{
+  public:
+	Mod* m_pOwningMod;
+	fs::path m_Path;
+};
+
+class ModManager
+{
+  private:
+	bool m_bHasLoadedMods = false;
+	bool m_bHasEnabledModsCfg;
+	rapidjson_document m_EnabledModsCfg;
+
+	// precalculated hashes
+	size_t m_hScriptsRsonHash;
+	size_t m_hPdefHash;
+	size_t m_hKBActHash;
+
+  public:
+	std::vector<Mod> m_LoadedMods;
+	std::unordered_map<std::string, ModOverrideFile> m_ModFiles;
+	std::unordered_map<std::string, std::string> m_DependencyConstants;
+
+  public:
+	ModManager();
+	void LoadMods();
+	void UnloadMods();
+	std::string NormaliseModFilePath(const fs::path path);
+	void CompileAssetsForFile(const char* filename);
+
+	// compile asset type stuff, these are done in files under runtime/compiled/
+	void BuildScriptsRson();
+	void TryBuildKeyValues(const char* filename);
+	void BuildPdef();
+	void BuildKBActionsList();
+};
+
+fs::path GetModFolderPath();
+fs::path GetCompiledAssetsPath();
+
+extern ModManager* g_pModManager;