refactor(web): insert blew action (#10722)

### TL;DR
Refactor the insert below functionality to work with page mode and edgeless mode
* Page Mode
  - Insert content below the current selection
  - If nothing selected, insert content below the last block
* EdgeLess Mode
  - If no note block is currently selected, create the content as a new note block.
  - Otherwise, insert content into the selected note

Close BS-2760

### What changed?
- Created separate insert handlers for page and edgeless modes with context-aware behavior
  - Added support for inserting content when nothing is selected by targeting the last content block
  - Added special handling for edgeless mode to support inserting below selected note blocks
- Removed the "Replace selection" action and consolidated insert functionality
- Optimized the clickable area of the action button

packages/frontend/core/src/blocksuite/ai/_common/chat-actions-handle.ts

@@ -1,9 +1,10 @@
 import { ChatHistoryOrder } from '@affine/graphql';
 import {
-  BlockSelection,
+  type BlockComponent,
+  type BlockSelection,
   type BlockStdScope,
   type EditorHost,
-  TextSelection,
+  type TextSelection,
 } from '@blocksuite/affine/block-std';
 import { GfxControllerIdentifier } from '@blocksuite/affine/block-std/gfx';
 import { EdgelessCRUDIdentifier } from '@blocksuite/affine/blocks/surface';
@@ -14,11 +15,15 @@ import {
 } from '@blocksuite/affine/global/gfx';
 import {
   type DocMode,
+  NoteBlockModel,
   NoteDisplayMode,
-  ParagraphBlockModel,
 } from '@blocksuite/affine/model';
 import { RefNodeSlotsProvider } from '@blocksuite/affine/rich-text';
-import { getSelectedBlocksCommand } from '@blocksuite/affine/shared/commands';
+import {
+  getFirstBlockCommand,
+  getLastBlockCommand,
+  getSelectedBlocksCommand,
+} from '@blocksuite/affine/shared/commands';
 import type { ImageSelection } from '@blocksuite/affine/shared/selection';
 import {
   DocModeProvider,
@@ -26,14 +31,12 @@ import {
   NotificationProvider,
   TelemetryProvider,
 } from '@blocksuite/affine/shared/services';
-import { matchModels } from '@blocksuite/affine/shared/utils';
 import type { Store } from '@blocksuite/affine/store';
 import {
   BlockIcon,
   InsertBleowIcon as InsertBelowIcon,
   LinkedPageIcon,
   PageIcon,
-  ReplaceIcon,
 } from '@blocksuite/icons/lit';
 import type { TemplateResult } from 'lit';
 
@@ -41,7 +44,7 @@ import { insertFromMarkdown } from '../../utils';
 import type { ChatMessage } from '../blocks';
 import { AIProvider, type AIUserInfo } from '../provider';
 import { reportResponse } from '../utils/action-reporter';
-import { insertBelow, replace } from '../utils/editor-actions';
+import { insertBelow } from '../utils/editor-actions';
 
 type Selections = {
   text?: TextSelection;
@@ -201,70 +204,63 @@ export function promptDocTitle(host: EditorHost, autofill?: string) {
   });
 }
 
-const REPLACE_SELECTION = {
-  icon: ReplaceIcon({ width: '20px', height: '20px' }),
-  title: 'Replace selection',
-  showWhen: (host: EditorHost) => {
-    if (host.std.store.readonly$.value) {
-      return false;
-    }
-    const textSelection = host.selection.find(TextSelection);
-    const blockSelections = host.selection.filter(BlockSelection);
-    if (
-      (!textSelection || textSelection.from.length === 0) &&
-      blockSelections?.length === 0
-    ) {
-      return false;
-    }
-    return true;
-  },
-  toast: 'Successfully replaced',
-  handler: async (
-    host: EditorHost,
-    content: string,
-    currentSelections: Selections
-  ) => {
-    const currentTextSelection = currentSelections.text;
-    const currentBlockSelections = currentSelections.blocks;
-    const [_, data] = host.command.exec(getSelectedBlocksCommand, {
+/**
+ * Get insert below block based on current selections
+ * @param host Editor host
+ * @param currentSelections Current selections
+ * @returns Selected blocks and selection state
+ */
+async function getInsertBelowBlock(
+  host: EditorHost,
+  currentSelections: Selections
+): Promise<BlockComponent | null> {
+  const currentTextSelection = currentSelections.text;
+  const currentBlockSelections = currentSelections.blocks;
+  const currentImageSelections = currentSelections.images;
+
+  const [_, { selectedBlocks: blocks }] = host.command.exec(
+    getSelectedBlocksCommand,
+    {
       currentTextSelection,
       currentBlockSelections,
-    });
-    if (!data.selectedBlocks) return false;
-
-    reportResponse('result:replace');
-
-    if (currentTextSelection) {
-      const { doc } = host;
-      const block = doc.getBlock(currentTextSelection.blockId);
-      if (matchModels(block?.model ?? null, [ParagraphBlockModel])) {
-        block?.model.text?.replace(
-          currentTextSelection.from.index,
-          currentTextSelection.from.length,
-          content
-        );
-        return true;
-      }
+      currentImageSelections,
     }
+  );
 
-    await replace(
-      host,
-      content,
-      data.selectedBlocks[0],
-      data.selectedBlocks.map(block => block.model),
-      currentTextSelection
-    );
-    return true;
-  },
-};
+  if (blocks && blocks.length) {
+    return blocks[blocks.length - 1];
+  }
 
-const INSERT_BELOW = {
+  return null;
+}
+
+/**
+ * Base handler for inserting content below the block
+ * @param host Editor host
+ * @param content Content to insert
+ * @param block block
+ * @returns Whether insertion was successful
+ */
+async function insertBelowBlock(
+  host: EditorHost,
+  content: string,
+  block: BlockComponent | null
+): Promise<boolean> {
+  if (!block) return false;
+
+  reportResponse('result:insert');
+  await insertBelow(host, content, block);
+  return true;
+}
+
+const PAGE_INSERT = {
   icon: InsertBelowIcon({ width: '20px', height: '20px' }),
-  title: 'Insert below',
+  title: 'Insert',
   showWhen: (host: EditorHost) => {
     if (host.std.store.readonly$.value) {
       return false;
     }
+
     return true;
   },
   toast: 'Successfully inserted',
@@ -273,22 +269,68 @@ const INSERT_BELOW = {
     content: string,
     currentSelections: Selections
   ) => {
-    const currentTextSelection = currentSelections.text;
-    const currentBlockSelections = currentSelections.blocks;
-    const currentImageSelections = currentSelections.images;
-    const [_, data] = host.command.exec(getSelectedBlocksCommand, {
-      currentTextSelection,
-      currentBlockSelections,
-      currentImageSelections,
-    });
-    if (!data.selectedBlocks) return false;
-    reportResponse('result:insert');
-    await insertBelow(
-      host,
-      content,
-      data.selectedBlocks[data.selectedBlocks?.length - 1]
-    );
-    return true;
+    const block = await getInsertBelowBlock(host, currentSelections);
+
+    const isNothingSelected = !block;
+
+    // In page mode, if nothing is selected, use the last content block
+    if (isNothingSelected) {
+      const [_, { firstBlock: noteBlock }] = host.command.exec(
+        getFirstBlockCommand,
+        {
+          flavour: 'affine:note',
+        }
+      );
+
+      const lastChild = noteBlock?.lastChild();
+      const lastBlock = lastChild ? host.std.view.getBlock(lastChild.id) : null;
+
+      return insertBelowBlock(host, content, lastBlock);
+    }
+
+    return insertBelowBlock(host, content, block);
+  },
+};
+
+const EDGELESS_INSERT = {
+  ...PAGE_INSERT,
+  handler: async (
+    host: EditorHost,
+    content: string,
+    currentSelections: Selections
+  ): Promise<boolean> => {
+    const block = await getInsertBelowBlock(host, currentSelections);
+
+    const isNothingSelected = !block;
+
+    // In edgeless mode, handle special cases
+    if (isNothingSelected) {
+      const gfx = host.std.get(GfxControllerIdentifier);
+      const selectedElements = gfx.selection.selectedElements;
+      const isOnlyOneNoteSelected =
+        selectedElements.length === 1 &&
+        selectedElements[0] instanceof NoteBlockModel;
+
+      if (isOnlyOneNoteSelected) {
+        // Insert into selected note
+        const [_, { lastBlock: lastBlockModel }] = host.command.exec(
+          getLastBlockCommand,
+          {
+            root: selectedElements[0] as NoteBlockModel,
+          }
+        );
+
+        const lastBlock = lastBlockModel
+          ? host.std.view.getBlock(lastBlockModel.id)
+          : null;
+        return insertBelowBlock(host, content, lastBlock);
+      } else {
+        // Create a new note
+        return !!(await ADD_TO_EDGELESS_AS_NOTE.handler(host, content));
+      }
+    }
+
+    return insertBelowBlock(host, content, block);
   },
 };
 
@@ -397,7 +439,7 @@ const ADD_TO_EDGELESS_AS_NOTE = {
     return true;
   },
   toast: 'New note created',
-  handler: async (host: EditorHost, content: string) => {
+  handler: async (host: EditorHost, content: string): Promise<boolean> => {
     reportResponse('result:add-note');
     const { doc } = host;
 
@@ -535,16 +577,14 @@ const CREATE_AS_LINKED_DOC = {
   },
 };
 
-const CommonActions: ChatAction[] = [REPLACE_SELECTION, INSERT_BELOW];
-
 export const PageEditorActions = [
-  ...CommonActions,
+  PAGE_INSERT,
   CREATE_AS_DOC,
   SAVE_CHAT_TO_BLOCK_ACTION,
 ];
 
 export const EdgelessEditorActions = [
-  ...CommonActions,
+  EDGELESS_INSERT,
   ADD_TO_EDGELESS_AS_NOTE,
   SAVE_CHAT_TO_BLOCK_ACTION,
 ];

packages/frontend/core/src/blocksuite/ai/components/chat-action-list.ts

@@ -115,43 +115,45 @@ export class ChatActionList extends LitElement {
           actions.filter(action => action.showWhen(host)),
           action => action.title,
           action => {
-            return html`<div class="action">
+            return html`<div
+              class="action"
+              @click=${async () => {
+                if (
+                  action.title === 'Insert below' &&
+                  this._selectionValue.length === 1 &&
+                  this._selectionValue[0].type === 'database'
+                ) {
+                  const element = this.host.view.getBlock(
+                    this._selectionValue[0].blockId
+                  );
+                  if (!element) return;
+                  await insertBelow(host, content, element);
+                  return;
+                }
+                const currentSelections = {
+                  text: this._currentTextSelection,
+                  blocks: this._currentBlockSelections,
+                  images: this._currentImageSelections,
+                };
+                const sessionId = await this.getSessionId();
+                const success = await action.handler(
+                  host,
+                  content,
+                  currentSelections,
+                  sessionId,
+                  messageId
+                );
+                if (success) {
+                  this.host.std.getOptional(NotificationProvider)?.notify({
+                    title: action.toast,
+                    accent: 'success',
+                    onClose: function (): void {},
+                  });
+                }
+              }}
+            >
               ${action.icon}
               <div
-                @click=${async () => {
-                  if (
-                    action.title === 'Insert below' &&
-                    this._selectionValue.length === 1 &&
-                    this._selectionValue[0].type === 'database'
-                  ) {
-                    const element = this.host.view.getBlock(
-                      this._selectionValue[0].blockId
-                    );
-                    if (!element) return;
-                    await insertBelow(host, content, element);
-                    return;
-                  }
-                  const currentSelections = {
-                    text: this._currentTextSelection,
-                    blocks: this._currentBlockSelections,
-                    images: this._currentImageSelections,
-                  };
-                  const sessionId = await this.getSessionId();
-                  const success = await action.handler(
-                    host,
-                    content,
-                    currentSelections,
-                    sessionId,
-                    messageId
-                  );
-                  if (success) {
-                    this.host.std.getOptional(NotificationProvider)?.notify({
-                      title: action.toast,
-                      accent: 'success',
-                      onClose: function (): void {},
-                    });
-                  }
-                }}
                 data-testid="action-${action.title
                   .toLowerCase()
                   .replaceAll(' ', '-')}"