DataGrid - AI Assistant: Implement message cleanup

packages/devextreme/js/__internal/grids/grid_core/ai_assistant/__tests__/ai_assistant_view.test.ts

@@ -281,6 +281,20 @@ describe('AIAssistantView', () => {
   });
 
   describe('chat event handlers', () => {
+    describe('onChatCleared', () => {
+      it('should call clear on aiChatInstance when triggered', () => {
+        createAIAssistantView();
+
+        const aiChatInstance = (AIChat as jest.Mock)
+          .mock.results[0].value as { clear: jest.Mock };
+
+        const aiChatConfig = (AIChat as jest.Mock).mock.calls[0][0] as AIChatOptions;
+        aiChatConfig.onChatCleared?.();
+
+        expect(aiChatInstance.clear).toHaveBeenCalledTimes(1);
+      });
+    });
+
     describe('onMessageEntered', () => {
       it('should send request to AI with the entered message', () => {
         mockAIAssistantController.sendRequestToAI.mockReturnValue(Promise.resolve());

packages/devextreme/js/__internal/grids/grid_core/ai_assistant/__tests__/ai_assistant_view_controller.integration.test.ts

@@ -357,5 +357,27 @@ describe('AIAssistantViewController', () => {
       expect(getMessageStatusClass($messagesAfter.eq(1)))
         .toBe(MessageStatus.Success);
     });
+
+    it('should clear all messages when clear chat button is clicked', async () => {
+      const { instance, getLastCallbacks } = await createDataGridWithAIAssistant();
+
+      sendAIRequest(instance, 'Sort by Name');
+
+      getLastCallbacks().onComplete?.({
+        actions: [{ name: 'sort', args: { column: 'Name' } }],
+      });
+      await flushAsync();
+      await flushAsync();
+
+      expect(findMessageElements().length).toBe(1);
+
+      const clearButtonEl = document.querySelector(`.${CLASSES.clearChatButton} .dx-button`) as HTMLElement;
+
+      clearButtonEl.click();
+      await flushAsync();
+      await flushAsync();
+
+      expect(findMessageElements().length).toBe(0);
+    });
   });
 });

packages/devextreme/js/__internal/grids/grid_core/ai_assistant/ai_assistant_view.ts

@@ -44,7 +44,9 @@ export class AIAssistantView extends View {
     return {
       container: this.element(),
       createComponent: this._createComponent.bind(this),
-      onChatCleared: (): void => {},
+      onChatCleared: (): void => {
+        this.aiChatInstance.clear();
+      },
       onRegenerate: (): void => {},
       popupOptions,
       chatOptions,

packages/devextreme/js/__internal/grids/grid_core/ai_chat/ai_chat.test.ts

@@ -39,9 +39,15 @@ const mockPopupInstance = {
 
 const mockChatElement = $('<div>');
 
+const mockDataSource = {
+  store: jest.fn(),
+  reload: jest.fn(),
+};
+
 const mockChatInstance = {
   option: jest.fn(),
   $element: jest.fn(() => mockChatElement),
+  getDataSource: jest.fn(() => mockDataSource),
 };
 
 const mockClearChatButtonInstance = {
@@ -130,6 +136,7 @@ const beforeTest = (): void => {
   mockChatElement.empty();
   mockWidgetInstance.option.mockClear();
   mockClearChatButtonInstance.option.mockClear();
+  mockChatInstance.getDataSource.mockReturnValue(mockDataSource);
 };
 
 const afterTest = (): void => {
@@ -919,4 +926,40 @@ describe('AIChat', () => {
       });
     });
   });
+
+  describe('clear', () => {
+    it('should clear store and reload dataSource', () => {
+      const mockStore = { clear: jest.fn() };
+      mockDataSource.store.mockReturnValue(mockStore);
+
+      const { aiChat } = createAIChat();
+      triggerContentTemplate();
+
+      aiChat.clear();
+
+      expect(mockChatInstance.getDataSource).toHaveBeenCalledTimes(1);
+      expect(mockDataSource.store).toHaveBeenCalledTimes(1);
+      expect(mockStore.clear).toHaveBeenCalledTimes(1);
+      expect(mockDataSource.reload).toHaveBeenCalledTimes(1);
+    });
+
+    it('should not throw when dataSource is undefined', () => {
+      mockChatInstance.getDataSource.mockReturnValue(undefined as any);
+
+      const { aiChat } = createAIChat();
+      triggerContentTemplate();
+
+      expect(() => {
+        aiChat.clear();
+      }).not.toThrow();
+    });
+
+    it('should not throw when chatInstance is not initialized', () => {
+      const { aiChat } = createAIChat();
+
+      expect(() => {
+        aiChat.clear();
+      }).not.toThrow();
+    });
+  });
 });

packages/devextreme/js/__internal/grids/grid_core/ai_chat/ai_chat.ts

@@ -1,6 +1,7 @@
 import { name as clickEventName } from '@js/common/core/events/click';
 import eventsEngine from '@js/common/core/events/core/events_engine';
 import messageLocalization from '@js/common/core/localization/message';
+import type { ArrayStore } from '@js/common/data';
 import type { dxElementWrapper } from '@js/core/renderer';
 import $ from '@js/core/renderer';
 import type { Message, Properties as ChatProperties } from '@js/ui/chat';
@@ -333,4 +334,13 @@ export class AIChat {
     this.renderMessageHeader($content, message);
     this.renderMessageStateContent($content, message);
   }
+
+  public clear(): void {
+    const dataSource = this.chatInstance?.getDataSource();
+    const store = dataSource?.store() as ArrayStore<Message, string>;
+
+    store?.clear();
+    // eslint-disable-next-line @typescript-eslint/no-floating-promises
+    dataSource?.reload();
+  }
 }