[AiAssistance] Mark existing conversation as readonly before starting new one

Bug: 397184236
Change-Id: Iac114261f57546fa91c646fad9cadc81127eb5cb
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6276246
Reviewed-by: Alex Rudenko <[email protected]>
Auto-Submit: Samiya Caur <[email protected]>
Commit-Queue: Samiya Caur <[email protected]>

Author: Samiya Caur

front_end/panels/ai_assistance/AiAssistancePanel.test.ts

@@ -604,6 +604,7 @@ describeWithMockConnection('AI Assistance Panel', () => {
       await expectViewUpdate(() => {
         contextMenu.invokeHandler(freestylerEntry.id());
       });
+      assert.isTrue(view.lastCall.args[0].isReadOnly);
       // Currently history should not store image input
       assert.deepEqual(view.lastCall.args[0].messages, [
         {

front_end/panels/ai_assistance/AiAssistancePanel.ts

@@ -463,6 +463,7 @@ export class AiAssistancePanel extends UI.Panel.Panel {
       this.#messages = [];
       this.#isLoading = false;
       this.#currentAgent = agent;
+      this.#currentConversation?.archiveConversation();
       if (this.#currentAgent?.type) {
         this.#currentConversation =
             new Conversation(agentTypeToConversationType(this.#currentAgent.type), [], agent?.id, false);

front_end/panels/ai_assistance/AiHistoryStorage.ts

@@ -29,13 +29,17 @@ export class Conversation {
   readonly id: string;
   readonly history: ResponseData[];
   readonly type: ConversationType;
-  readonly isReadOnly: boolean;
+  #isReadOnly: boolean;
 
   constructor(type: ConversationType, data: ResponseData[] = [], id: string = crypto.randomUUID(), isReadOnly = true) {
     this.type = type;
     this.history = data;
     this.id = id;
-    this.isReadOnly = isReadOnly;
+    this.#isReadOnly = isReadOnly;
+  }
+
+  get isReadOnly(): boolean {
+    return this.#isReadOnly;
   }
 
   get title(): string|undefined {
@@ -51,6 +55,10 @@ export class Conversation {
     return this.history.length === 0;
   }
 
+  archiveConversation(): void {
+    this.#isReadOnly = true;
+  }
+
   addHistoryItem(item: ResponseData): void {
     if (item.type === ResponseType.USER_QUERY) {
       const historyItem = {...item, imageInput: undefined};