Merge pull request #1205 from Hy4ri/feat/backend-only-context-meter

fix(chat): make context meter strictly backend-reported

app/src/androidTest/java/com/m57/hermescontrol/ui/chat/components/ContextUsageComponentsTest.kt

@@ -0,0 +1,110 @@
+package com.m57.hermescontrol.ui.chat.components
+
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.onNodeWithText
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.MediumTest
+import com.m57.hermescontrol.theme.HermesControlTheme
+import com.m57.hermescontrol.ui.chat.ContextBreakdown
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Regression coverage for backend-reported context occupancy.
+ *
+ * Cumulative REST input-token accounting must never masquerade as the live
+ * context-window numerator when the backend has not reported context_used.
+ */
+@RunWith(AndroidJUnit4::class)
+@MediumTest
+class ContextUsageComponentsTest {
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    @Test
+    fun chip_missingBackendOccupancy_doesNotShowFakeZeroPercent() {
+        composeTestRule.setContent {
+            HermesControlTheme {
+                ContextUsageChip(
+                    usedTokens = null,
+                    fullTokens = 128_000L,
+                )
+            }
+        }
+
+        composeTestRule
+            .onNodeWithText("— / 128k context")
+            .assertIsDisplayed()
+
+        composeTestRule
+            .onNodeWithText("0%")
+            .assertDoesNotExist()
+    }
+
+    @Test
+    fun chip_backendOccupancyAvailable_showsDeterminateUsage() {
+        composeTestRule.setContent {
+            HermesControlTheme {
+                ContextUsageChip(
+                    usedTokens = 64_000L,
+                    fullTokens = 128_000L,
+                )
+            }
+        }
+
+        composeTestRule
+            .onNodeWithText("64k / 128k context")
+            .assertIsDisplayed()
+
+        composeTestRule
+            .onNodeWithText("50%")
+            .assertIsDisplayed()
+    }
+
+    @OptIn(ExperimentalMaterial3Api::class)
+    @Test
+    fun detailSheet_missingBackendOccupancy_doesNotUseCumulativeInputTokensAsNumerator() {
+        composeTestRule.setContent {
+            HermesControlTheme {
+                ContextDetailSheet(
+                    breakdown =
+                        ContextBreakdown(
+                            inputTokens = 12_300L,
+                            outputTokens = 2_000L,
+                            cacheReadTokens = 500L,
+                            cacheWriteTokens = 250L,
+                            reasoningTokens = 100L,
+                            messageCount = 4,
+                        ),
+                    usedTokens = null,
+                    fullTokens = 128_000L,
+                    onDismiss = {},
+                )
+            }
+        }
+
+        // The live numerator is unavailable, even though cumulative REST
+        // input-token accounting exists below in the detail breakdown.
+        composeTestRule
+            .onNodeWithText("—")
+            .assertIsDisplayed()
+
+        composeTestRule
+            .onNodeWithText("Context window usage unavailable")
+            .assertIsDisplayed()
+
+        // Cumulative accounting is still preserved as informational detail.
+        composeTestRule
+            .onNodeWithText("12.3k")
+            .assertIsDisplayed()
+
+        // Most important regression guard: null occupancy is not rendered as
+        // a determinate zero-percent context state.
+        composeTestRule
+            .onNodeWithText("0% of context window used")
+            .assertDoesNotExist()
+    }
+}

app/src/main/java/com/m57/hermescontrol/ui/chat/components/ContextDetailSheet.kt

@@ -51,12 +51,12 @@ fun ContextDetailSheet(
         sheetState = sheetState,
     ) {
         val full = fullTokens ?: 0L
-        val used = usedTokens ?: breakdown.inputTokens
-        val fraction = if (full > 0L) min(1f, used.toFloat() / full.toFloat()) else 0f
+        val fraction = if (full > 0L && usedTokens != null) min(1f, usedTokens.toFloat() / full.toFloat()) else 0f
         val pct = (fraction * 100).toInt()
         val statusColors = LocalHermesStatusColors.current
         val barColor =
             when {
+                usedTokens == null -> MaterialTheme.colorScheme.primary
                 pct >= 90 -> statusColors.error
                 pct >= 70 -> statusColors.warning
                 else -> MaterialTheme.colorScheme.primary
@@ -83,7 +83,7 @@ fun ContextDetailSheet(
                 verticalAlignment = Alignment.Bottom,
             ) {
                 Text(
-                    text = formatTokens(used),
+                    text = if (usedTokens != null) formatTokens(usedTokens) else "—",
                     style = MaterialTheme.typography.headlineSmall,
                     fontWeight = FontWeight.Bold,
                     color = barColor,
@@ -115,7 +115,12 @@ fun ContextDetailSheet(
                 )
             }
             Text(
-                text = "$pct% of context window used",
+                text =
+                    if (usedTokens != null) {
+                        "$pct% of context window used"
+                    } else {
+                        stringResource(R.string.context_window_usage_unavailable)
+                    },
                 style = MaterialTheme.typography.labelMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )

app/src/main/java/com/m57/hermescontrol/ui/chat/components/ContextUsageChip.kt

@@ -56,12 +56,12 @@ fun ContextUsageChip(
     val full = fullTokens
     if (full == null || full <= 0L) return
 
-    val used = usedTokens ?: 0L
-    val fraction = min(1f, used.toFloat() / full.toFloat())
+    val fraction = if (usedTokens != null) min(1f, usedTokens.toFloat() / full.toFloat()) else 0f
     val pct = (fraction * 100).toInt()
     val statusColors = LocalHermesStatusColors.current
     val barColor =
         when {
+            usedTokens == null -> MaterialTheme.colorScheme.primary
             pct >= 90 -> statusColors.error
             pct >= 70 -> statusColors.warning
             else -> MaterialTheme.colorScheme.primary
@@ -90,7 +90,7 @@ fun ContextUsageChip(
             Text(
                 text =
                     if (usedTokens != null) {
-                        "${formatTokens(used)} / ${formatTokens(full)} context"
+                        "${formatTokens(usedTokens)} / ${formatTokens(full)} context"
                     } else {
                         "— / ${formatTokens(full)} context"
                     },
@@ -111,12 +111,14 @@ fun ContextUsageChip(
                         maxLines = 1,
                     )
                 }
-                Text(
-                    text = "$pct%",
-                    style = MaterialTheme.typography.labelSmall,
-                    color = barColor,
-                    maxLines = 1,
-                )
+                if (usedTokens != null) {
+                    Text(
+                        text = "$pct%",
+                        style = MaterialTheme.typography.labelSmall,
+                        color = barColor,
+                        maxLines = 1,
+                    )
+                }
             }
         }
         Box(

app/src/main/res/values-ar/strings.xml

@@ -1308,8 +1308,9 @@
 <string name="context_completion_output">الإكمال (المخرجات)</string>
 <string name="context_compressed">مضغوط ×%1$s</string>
 <string name="context_prompt_input">المطالبة (المدخلات)</string>
-<string name="context_tokens_note">تعكس رموز المطالبة إجمالي السياق المستخدم في هذه الجلسة حتى الآن.</string>
+<string name="context_tokens_note">أعداد الرموز أدناه تراكمية للجلسة ولا تمثل الاستخدام الحالي لنافذة السياق.</string>
 <string name="context_window">نافذة السياق</string>
+<string name="context_window_usage_unavailable">استخدام نافذة السياق غير متوفر</string>
 <string name="gif_play">تشغيل GIF</string>
 <string name="kanban_filter_placeholder">تصفية المهام حسب العنوان أو الحالة أو المسؤول...</string>
 <string name="logs_clipboard_label">سجلات Hermes</string>

app/src/main/res/values-zh/strings.xml

@@ -1275,8 +1275,9 @@
     <string name="context_completion_output">补全（输出）</string>
     <string name="context_compressed">已压缩 ×%1$s</string>
     <string name="context_prompt_input">提示词（输入）</string>
-    <string name="context_tokens_note">提示词 token 反映此会话迄今使用的总上下文。</string>
+    <string name="context_tokens_note">下方 token 数为会话累计用量，不代表当前上下文窗口占用。</string>
     <string name="context_window">上下文窗口</string>
+    <string name="context_window_usage_unavailable">上下文窗口使用量不可用</string>
     <string name="gif_play">播放 GIF</string>
     <string name="kanban_filter_placeholder">按标题、状态或负责人筛选任务…</string>
     <string name="logs_clipboard_label">Hermes 日志</string>

app/src/main/res/values/strings.xml

@@ -1435,8 +1435,9 @@
     <string name="context_completion_output">Completion (output)</string>
     <string name="context_compressed">compressed ×%1$s</string>
     <string name="context_prompt_input">Prompt (input)</string>
-    <string name="context_tokens_note">Prompt tokens reflect total context used by this session so far.</string>
+    <string name="context_tokens_note">Token counts below are cumulative session accounting and do not represent current context-window occupancy.</string>
     <string name="context_window">Context window</string>
+    <string name="context_window_usage_unavailable">Context window usage unavailable</string>
     <string name="gif_play">Play GIF</string>
     <string name="kanban_filter_placeholder">Filter tasks by title, status, or assignee...</string>
     <string name="logs_clipboard_label">Hermes Logs</string>