feat: prevent tracking start when no metrics enabled

Add hasAnyMetricEnabled() check before starting tracker.
If all metrics (FPS, TPS, MSPT, Heap, CPU) are disabled,
show error message instead of starting.

Author: WhatDamon

src/main/java/org/damon233/performtrackermod/controller/TrackerController.java

@@ -70,6 +70,10 @@ public synchronized void start() {
         if (state.get() == TrackerState.RUNNING) {
             throw new IllegalStateException("error.already_running");
         }
+        
+        if (!hasAnyMetricEnabled()) {
+            throw new IllegalStateException("error.no_metrics_enabled");
+        }
 
         this.sessionId = generateSessionId();
 
@@ -99,6 +103,14 @@ public synchronized void start() {
         LOGGER.info("Performance tracking started, sessionId: {}", sessionId);
     }
 
+    private boolean hasAnyMetricEnabled() {
+        return ConfigAccess.isCollectFps() ||
+                ConfigAccess.isCollectTps() ||
+                ConfigAccess.isCollectMspt() ||
+                ConfigAccess.isCollectHeap() ||
+                ConfigAccess.isCollectCpu();
+    }
+
     public synchronized void stop() {
         if (state.get() == TrackerState.IDLE) {
             throw new IllegalStateException("error.not_running");

src/main/resources/assets/performtracker/lang/en_us.json

@@ -3,7 +3,7 @@
   "modmenu.summaryTranslation.performtracker": "Track game performance metrics",
   "performtracker.start.success": "Performance tracking started. Output saved to: %s",
   "performtracker.stop.success": "Performance tracking stopped. %d samples collected.",
-  "performtracker.error.not_initialized": "Tracker not initialized",
+  "performtracker.error.not_initialized": "Tracker not initialized\nPerhaps because you haven't enabled any metrics. Enable at least one in settings.",
   "performtracker.error.already_running": "Tracker is already running",
   "performtracker.error.not_running": "Tracker is not running",
   "performtracker.command.start": "start",

src/main/resources/assets/performtracker/lang/lzh.json

@@ -3,7 +3,7 @@
   "modmenu.summaryTranslation.performtracker": "稽察遊藝效能之度數",
   "performtracker.start.success": "效能追蹤既啟, 錄文存於: %s",
   "performtracker.stop.success": "效能追蹤既訖, 凡集樣 %d 枚。",
-  "performtracker.error.not_initialized": "追蹤器未始",
+  "performtracker.error.not_initialized": "追蹤器未始\n恐未啟度數, 望君於置設啟其一。",
   "performtracker.error.already_running": "追蹤器方行中",
   "performtracker.error.not_running": "追蹤器未運",
   "performtracker.command.start": "啟",

src/main/resources/assets/performtracker/lang/zh_cn.json

@@ -3,7 +3,7 @@
   "modmenu.summaryTranslation.performtracker": "追踪游戏性能指标",
   "performtracker.start.success": "性能追踪已启动。输出保存至: %s",
   "performtracker.stop.success": "性能追踪已停止。共收集 %d 个样本。",
-  "performtracker.error.not_initialized": "追踪器未初始化",
+  "performtracker.error.not_initialized": "追踪器未初始化\n可能是因为未启用任何指标。请在设置中至少启用一项指标。",
   "performtracker.error.already_running": "追踪器已在运行中",
   "performtracker.error.not_running": "追踪器未在运行",
   "performtracker.command.start": "启动",

src/main/resources/assets/performtracker/lang/zh_tw.json

@@ -3,7 +3,7 @@
   "modmenu.summaryTranslation.performtracker": "追蹤遊戲效能指標",
   "performtracker.start.success": "效能追蹤已啟動。輸出已儲存至: %s",
   "performtracker.stop.success": "效能追蹤已停止。共收集 %d 筆樣本。",
-  "performtracker.error.not_initialized": "追蹤器未初始化",
+  "performtracker.error.not_initialized": "追蹤器未初始化\n或因为未啟用任何指標。請在設定中至少啟用一項指標。",
   "performtracker.error.already_running": "追蹤器已在執行中",
   "performtracker.error.not_running": "追蹤器未在執行",
   "performtracker.command.start": "啟動",