Expose language read and selection failures in the settings UI

tools/chatgui-android/app/src/main/java/com/utun/chat/ui/components/LanguageSetting.kt

@@ -3,39 +3,67 @@ package com.utun.chat.ui.components
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowDropDown
+import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.res.stringResource
 import com.utun.chat.R
 import com.utun.chat.data.AppLanguage
 import com.utun.chat.data.LogManager
 
+/** Выбор одного языка каталога либо «Как в системе»; название текущего запроса учитывает приоритетный список Android.
+ * Чтение повторяется при новой Configuration/явной попытке; ошибка не выдаётся за системный выбор.
+ * Неудачный select оставляет прежний выбор и показывает ошибку, повтор открывает меню без перезапуска служб.
+ * Успех означает принятие запроса AppCompat; фактические ресурсы/пересоздание Activity применяет Android. */
 @Composable
 fun LanguageSetting() {
     var expanded by remember { mutableStateOf(false) }
-    val selected = AppLanguage.selectedTag()
+    var retry by remember { mutableIntStateOf(0) }
+    var selectionFailed by remember { mutableStateOf(false) }
+    val configuration = LocalConfiguration.current
+    val state = remember(configuration, retry) {
+        runCatching { AppLanguage.selectedTag() to AppLanguage.supportedTags }
+    }
+    val selection = state.getOrNull()
+    val selected = selection?.first
     val systemLabel = stringResource(R.string.language_system)
-    val options = listOf("" to systemLabel) + AppLanguage.supportedTags.map { it to AppLanguage.nativeName(it) }
-    val selectedName = options.firstOrNull { it.first == selected }?.second ?: AppLanguage.nativeName(selected)
-    Box(Modifier.fillMaxWidth()) {
-        OutlinedButton(onClick = {
-            expanded = true
-            LogManager.addLog("DEBUG", "LANGUAGE", "Language menu opened: selected=$selected options=${options.map { it.first }}")
-        }, modifier = Modifier.fillMaxWidth()) {
-            Row(Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
-                Column(Modifier.weight(1f)) {
-                    Text(stringResource(R.string.interface_language), style = MaterialTheme.typography.labelMedium)
-                    Text(selectedName, style = MaterialTheme.typography.bodyLarge)
+    val options = listOf("" to systemLabel) + selection?.second.orEmpty().map { it to AppLanguage.nativeName(it) }
+    val selectedName = if (selected == null) stringResource(R.string.retry)
+        else options.firstOrNull { it.first == selected }?.second ?: AppLanguage.nativeName(selected)
+    Column(Modifier.fillMaxWidth()) {
+        Box(Modifier.fillMaxWidth()) {
+            OutlinedButton(onClick = {
+                selectionFailed = false
+                if (state.isFailure) {
+                    retry++
+                    LogManager.addLog("DEBUG", "LANGUAGE", "Language settings read retry requested")
+                } else {
+                    expanded = true
+                    LogManager.addLog("DEBUG", "LANGUAGE", "Language menu opened: selected=$selected options=${options.map { it.first }}")
+                }
+            }, modifier = Modifier.fillMaxWidth()) {
+                Row(Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
+                    Column(Modifier.weight(1f)) {
+                        Text(stringResource(R.string.interface_language), style = MaterialTheme.typography.labelMedium)
+                        Text(selectedName, style = MaterialTheme.typography.bodyLarge)
+                    }
+                    Icon(if (state.isFailure) Icons.Default.Refresh else Icons.Default.ArrowDropDown, contentDescription = null)
                 }
-                Icon(Icons.Default.ArrowDropDown, contentDescription = null)
             }
-        }
-        DropdownMenu(expanded = expanded, onDismissRequest = { expanded = false }) {
-            options.forEach { (tag, name) ->
-                DropdownMenuItem(text = { Text(name) }, onClick = { expanded = false; AppLanguage.select(tag) })
+            DropdownMenu(expanded = expanded && state.isSuccess, onDismissRequest = { expanded = false }) {
+                options.forEach { (tag, name) ->
+                    DropdownMenuItem(text = { Text(name) }, onClick = {
+                        expanded = false
+                        selectionFailed = !AppLanguage.select(tag)
+                        if (!selectionFailed) retry++
+                    })
+                }
             }
         }
+        val error = when { state.isFailure -> R.string.language_load_failed; selectionFailed -> R.string.language_apply_failed; else -> null }
+        error?.let { Text(stringResource(it), color = MaterialTheme.colorScheme.error, style = MaterialTheme.typography.bodySmall) }
     }
 }