fix(lightspeed): disable model selector in active chat sessions

workspaces/lightspeed/.changeset/gentle-models-lock.md

@@ -0,0 +1,5 @@
+---
+'@red-hat-developer-hub/backstage-plugin-lightspeed': patch
+---
+
+Disable model selector in active chat sessions to prevent switching models mid-conversation. A tooltip explains that each session supports only one model.

workspaces/lightspeed/plugins/lightspeed/report-alpha.api.md

@@ -272,6 +272,7 @@ export const lightspeedTranslationRef: TranslationRef<
     readonly 'sort.oldest': string;
     readonly 'sort.alphabeticalAsc': string;
     readonly 'sort.alphabeticalDesc': string;
+    readonly 'modelSelector.disabled.tooltip': string;
     readonly 'reasoning.thinking': string;
   }
 >;

workspaces/lightspeed/plugins/lightspeed/src/components/LightSpeedChat.tsx

@@ -1805,7 +1805,12 @@ export const LightspeedChat = ({
                 onNewChat();
                 handleSelectedModel(item);
               }}
-              disabled={isSendButtonDisabled}
+              disabled={isSendButtonDisabled || messages.length > 0}
+              disabledTooltip={
+                messages.length > 0
+                  ? t('modelSelector.disabled.tooltip')
+                  : undefined
+              }
             />
           }
           forceMultilineLayout

workspaces/lightspeed/plugins/lightspeed/src/components/MessageBarModelSelector.tsx

@@ -23,6 +23,7 @@ import {
   DropdownList,
   MenuToggle,
   MenuToggleElement,
+  Tooltip,
 } from '@patternfly/react-core';
 import { AngleDownIcon } from '@patternfly/react-icons';
 
@@ -33,6 +34,7 @@ type MessageBarModelSelectorProps = {
   models: { label: string; value: string; provider: string }[];
   onSelect: (model: string) => void;
   disabled?: boolean;
+  disabledTooltip?: string;
 };
 
 const useStyles = makeStyles(theme => ({
@@ -69,6 +71,7 @@ export const MessageBarModelSelector = ({
   models,
   onSelect,
   disabled = false,
+  disabledTooltip,
 }: MessageBarModelSelectorProps) => {
   const [isOpen, setIsOpen] = useState(false);
   const classes = useStyles();
@@ -92,7 +95,7 @@ export const MessageBarModelSelector = ({
     </MenuToggle>
   );
 
-  return (
+  const dropdown = (
     <Dropdown
       className={classes.dropdown}
       isOpen={isOpen}
@@ -121,4 +124,14 @@ export const MessageBarModelSelector = ({
       </DropdownList>
     </Dropdown>
   );
+
+  if (disabled && disabledTooltip) {
+    return (
+      <Tooltip content={disabledTooltip}>
+        <span style={{ cursor: 'not-allowed' }}>{dropdown}</span>
+      </Tooltip>
+    );
+  }
+
+  return dropdown;
 };

workspaces/lightspeed/plugins/lightspeed/src/translations/de.ts

@@ -177,6 +177,8 @@ const lightspeedTranslationDe = createTranslationMessages({
     'modal.save': 'Speichern',
     'modal.title.edit': 'Anhang bearbeiten',
     'modal.title.preview': 'Anhang in der Vorschau anzeigen',
+    'modelSelector.disabled.tooltip':
+      'Jede Chat-Sitzung unterstützt nur ein Modell. Um das Modell zu wechseln, starten Sie einen neuen Chat.',
     'notebook.document.delete': 'Löschen',
     'notebook.document.delete.action': 'Entfernen',
     'notebook.document.delete.description':

workspaces/lightspeed/plugins/lightspeed/src/translations/es.ts

@@ -173,6 +173,8 @@ const lightspeedTranslationEs = createTranslationMessages({
     'modal.save': 'Guardar',
     'modal.title.edit': 'Modificar archivo adjunto',
     'modal.title.preview': 'Previsualizar archivo adjunto',
+    'modelSelector.disabled.tooltip':
+      'Cada sesión de chat solo admite un modelo. Para cambiar de modelo, abra un nuevo chat.',
     'notebook.document.delete': 'Eliminar',
     'notebook.document.delete.action': 'Eliminar',
     'notebook.document.delete.description':

workspaces/lightspeed/plugins/lightspeed/src/translations/fr.ts

@@ -177,6 +177,8 @@ const lightspeedTranslationFr = createTranslationMessages({
     'modal.save': 'Sauvegarder',
     'modal.title.edit': 'Modifier la pièce jointe',
     'modal.title.preview': 'Aperçu de la pièce jointe',
+    'modelSelector.disabled.tooltip':
+      "Chaque session de chat ne prend en charge qu'un seul modèle. Pour changer de modèle, ouvrez un nouveau chat.",
     'notebook.document.delete': 'Supprimer',
     'notebook.document.delete.action': 'Supprimer',
     'notebook.document.delete.description':

workspaces/lightspeed/plugins/lightspeed/src/translations/it.ts

@@ -175,6 +175,8 @@ const lightspeedTranslationIt = createTranslationMessages({
     'modal.save': 'Salva',
     'modal.title.edit': 'Modifica allegato',
     'modal.title.preview': 'Anteprima allegato',
+    'modelSelector.disabled.tooltip':
+      'Ogni sessione di chat supporta un solo modello. Per cambiare modello, apri una nuova chat.',
     'notebook.document.delete': 'Elimina',
     'notebook.document.delete.action': 'Rimuovi',
     'notebook.document.delete.description':

workspaces/lightspeed/plugins/lightspeed/src/translations/ja.ts

@@ -172,6 +172,8 @@ const lightspeedTranslationJa = createTranslationMessages({
     'modal.save': '保存',
     'modal.title.edit': '添付ファイルの編集',
     'modal.title.preview': '添付ファイルのプレビュー',
+    'modelSelector.disabled.tooltip':
+      '各チャットセッションは1つのモデルのみサポートしています。モデルを切り替えるには、新しいチャットを開いてください。',
     'notebook.document.delete': '削除',
     'notebook.document.delete.action': '削除',
     'notebook.document.delete.description':

workspaces/lightspeed/plugins/lightspeed/src/translations/ref.ts

@@ -393,6 +393,10 @@ export const lightspeedMessages = {
   'sort.oldest': 'Date (oldest first)',
   'sort.alphabeticalAsc': 'Name (A-Z)',
   'sort.alphabeticalDesc': 'Name (Z-A)',
+  // Model selector
+  'modelSelector.disabled.tooltip':
+    'Each chat session supports only one model. To switch models, open a new chat.',
+
   // Deep thinking
   'reasoning.thinking': 'Show thinking',
 };