From bd9a3111fa81cb8c10317b1b862dc00b5f56c91d Mon Sep 17 00:00:00 2001
From: Jeffery <h3285@evertrust.com.tw>
Date: Tue, 23 Jun 2026 17:32:49 +0800
Subject: [PATCH] =?UTF-8?q?fix(usage=20=E5=89=A9=E9=A4=98=E7=99=BE?=
 =?UTF-8?q?=E5=88=86=E6=AF=94):=20=E6=8A=BD=E5=87=BA=20calculatePercent=20?=
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剩餘值為 null/undefined 時原本經 Number() 轉成 0 而算出 0%，
改由 calculatePercent 統一檢查有效性，無效值一律落到「無法計算」。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 app/usage.js | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/app/usage.js b/app/usage.js
index 16778a0..e8e668e 100644
--- a/app/usage.js
+++ b/app/usage.js
@@ -211,31 +211,39 @@ function round1(n) {
 
 const RATE_KIND_LABEL = { tokens: 'token', requests: '次數' };
 
-/** 是否為有限正數（排除 0、負數、NaN、Infinity），避免算出 Infinity%／NaN%／負百分比。 */
-function isFinitePositive(n) {
-  return Number.isFinite(Number(n)) && Number(n) > 0;
+/**
+ * 計算「剩餘百分比」= remaining / limit × 100。
+ * limit 或 remaining 為 null／undefined／NaN／Infinity，或 limit ≤ 0 時回 null，
+ * 避免算出 Infinity%／NaN%／負百分比或除以零。
+ */
+function calculatePercent(remaining, limit) {
+  if (remaining == null || limit == null) return null;
+  const rem = Number(remaining);
+  const lim = Number(limit);
+  if (!Number.isFinite(rem) || !Number.isFinite(lim) || lim <= 0) return null;
+  return round1((rem / lim) * 100);
 }
 
 /**
  * 計算「剩餘可用百分比」，依優先序擇一：
- * 1. 帳號額度（quota 有有限正數上限）→ 剩餘 credits / 上限；
- * 2. 速率配額（rate limit header，有限正數上限）→ 當前視窗剩餘 / 上限；
- * 上限或剩餘為 0／負數／NaN／Infinity 等無效值時不計算，落到 { percent: null, reason }。
+ * 1. 帳號額度（quota 有有效上限）→ 剩餘 credits / 上限；
+ * 2. 速率配額（rate limit header，有有效上限）→ 當前視窗剩餘 / 上限；
+ * 上限或剩餘為無效值（null／0／負數／NaN／Infinity）時跳過計算，落到 { percent: null, reason }。
  */
 export function resolveRemainingPercent(quota, rate) {
-  if (quota?.available && quota.limit != null && isFinitePositive(quota.limit)) {
+  if (quota?.available && quota.limit != null) {
     const limit = Number(quota.limit);
     const remaining = quota.remaining == null ? limit - num(quota.used) : Number(quota.remaining);
-    if (Number.isFinite(remaining)) {
-      return { percent: round1((remaining / limit) * 100), basis: '帳號額度', remaining, limit, unit: quota.currency || '' };
+    const percent = calculatePercent(remaining, limit);
+    if (percent != null) {
+      return { percent, basis: '帳號額度', remaining, limit, unit: quota.currency || '' };
     }
   }
-  if (rate?.hasData && isFinitePositive(rate.limit)) {
-    const limit = Number(rate.limit);
-    const remaining = Number(rate.remaining);
-    if (Number.isFinite(remaining)) {
+  if (rate?.hasData) {
+    const percent = calculatePercent(rate.remaining, rate.limit);
+    if (percent != null) {
       const kindLabel = RATE_KIND_LABEL[rate.kind] || rate.kind;
-      return { percent: round1((remaining / limit) * 100), basis: `速率配額（當前視窗，${kindLabel}）`, remaining, limit, unit: '' };
+      return { percent, basis: `速率配額（當前視窗，${kindLabel}）`, remaining: Number(rate.remaining), limit: Number(rate.limit), unit: '' };
     }
   }
   let reason;