From 43895197af5dbc3c3f90209a5bba8056ba74478b Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Sun, 8 Feb 2026 06:58:15 -0600
Subject: [PATCH] feat(ui): implement Script_SetCVar

---
 src/ui/game/GameScript.cpp   | 37 +++++++++++++++++++++++++++++++++++-
 src/ui/game/ScriptEvents.cpp |  2 +-
 src/ui/game/Types.hpp        |  2 ++
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/src/ui/game/GameScript.cpp b/src/ui/game/GameScript.cpp
index 8132635..9fe3ce3 100644
--- a/src/ui/game/GameScript.cpp
+++ b/src/ui/game/GameScript.cpp
@@ -4,6 +4,7 @@
 #include "ui/FrameScript.hpp"
 #include "ui/ScriptFunctionsShared.hpp"
 #include "ui/game/CGGameUI.hpp"
+#include "ui/game/Types.hpp"
 #include "ui/simple/CSimpleTop.hpp"
 #include "util/StringTo.hpp"
 #include "util/Unimplemented.hpp"
@@ -131,7 +132,41 @@ int32_t Script_GetCVarInfo(lua_State* L) {
 }
 
 int32_t Script_SetCVar(lua_State* L) {
-    WHOA_UNIMPLEMENTED(0);
+    if (!lua_isstring(L, 1)) {
+        luaL_error(L, "Usage: SetCVar(\"cvar\", value [, \"scriptCvar\")");
+        return 0;
+    }
+
+    auto varName = lua_tostring(L, 1);
+    auto var = CVar::LookupRegistered(varName);
+
+    if (!var || (var->m_flags & 0x40)) {
+        luaL_error(L, "Couldn't find CVar named '%s'", varName);
+        return 0;
+    }
+
+    if (var->m_flags & 0x4 || var->m_flags & 0x100) {
+        luaL_error(L, "\"%s\" is read-only", varName);
+        return 0;
+    }
+
+    if (!(var->m_flags & 0x8)/* TODO || CSimpleTop::GetInstance()->dword124C */) {
+        auto value = lua_tostring(L, 2);
+        if (!value) {
+            value = "0";
+        }
+
+        var->Set(value, true, false, false, true);
+
+        if (lua_isstring(L, 3)) {
+            auto scriptVarName = lua_tostring(L, 3);
+            FrameScript_SignalEvent(SCRIPT_CVAR_UPDATE, "%s%s", scriptVarName, value);
+        }
+    } else {
+        // TODO CGGameUI::ShowBlockedActionFeedback(nullptr, 2);
+    }
+
+    return 0;
 }
 
 int32_t Script_GetCVar(lua_State* L) {
diff --git a/src/ui/game/ScriptEvents.cpp b/src/ui/game/ScriptEvents.cpp
index a607076..dc30c00 100644
--- a/src/ui/game/ScriptEvents.cpp
+++ b/src/ui/game/ScriptEvents.cpp
@@ -1187,7 +1187,7 @@ void ScriptEventsInitialize() {
     g_scriptEvents[295] = "TRAINER_UPDATE";
     g_scriptEvents[296] = "TRAINER_DESCRIPTION_UPDATE";
     g_scriptEvents[297] = "TRAINER_CLOSED";
-    g_scriptEvents[298] = "CVAR_UPDATE";
+    g_scriptEvents[SCRIPT_CVAR_UPDATE] = "CVAR_UPDATE";
     g_scriptEvents[299] = "TRADE_SKILL_SHOW";
     g_scriptEvents[300] = "TRADE_SKILL_UPDATE";
     g_scriptEvents[301] = "TRADE_SKILL_CLOSE";
diff --git a/src/ui/game/Types.hpp b/src/ui/game/Types.hpp
index be7891f..a54dce4 100644
--- a/src/ui/game/Types.hpp
+++ b/src/ui/game/Types.hpp
@@ -9,6 +9,8 @@ enum SCRIPTEVENT {
     SCRIPT_PLAYER_LOGOUT = 254,
     SCRIPT_PLAYER_ENTERING_WORLD = 255,
     // TODO
+    SCRIPT_CVAR_UPDATE = 298,
+    // TODO
 };
 
 #endif