[8.10] [Observability AI Assistant] Save/open Lens embeddable (#165542) (#165548)

# Backport

This will backport the following commits from `main` to `8.10`:
- [[Observability AI Assistant] Save/open Lens embeddable
(#165542)](https://github.com/elastic/kibana/pull/165542)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Dario
Gieselaar","email":"dario.gieselaar@elastic.co"},"sourceCommit":{"committedDate":"2023-09-03T10:48:15Z","message":"[Observability
AI Assistant] Save/open Lens embeddable
(#165542)","sha":"1c531919721c463d80b22fb796bba82861508bd6","branchLabelMapping":{"^v8.11.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v8.10.0","v8.11.0"],"number":165542,"url":"https://github.com/elastic/kibana/pull/165542","mergeCommit":{"message":"[Observability
AI Assistant] Save/open Lens embeddable
(#165542)","sha":"1c531919721c463d80b22fb796bba82861508bd6"}},"sourceBranch":"main","suggestedTargetBranches":["8.10"],"targetPullRequestStates":[{"branch":"8.10","label":"v8.10.0","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.11.0","labelRegex":"^v8.11.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/165542","number":165542,"mergeCommit":{"message":"[Observability
AI Assistant] Save/open Lens embeddable
(#165542)","sha":"1c531919721c463d80b22fb796bba82861508bd6"}}]}]
BACKPORT-->

Co-authored-by: Dario Gieselaar <dario.gieselaar@elastic.co>

x-pack/plugins/observability_ai_assistant/public/components/chat/chat_body.tsx

@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import React, { useEffect, useRef } from 'react';
+import React, { useEffect, useRef, useState } from 'react';
 import { last } from 'lodash';
 import {
   EuiFlexGroup,
@@ -104,49 +104,40 @@ export function ChatBody({
       : '100%'};
   `;
 
+  const [stickToBottom, setStickToBottom] = useState(true);
+
+  const isAtBottom = (parent: HTMLElement) =>
+    parent.scrollTop + parent.clientHeight >= parent.scrollHeight;
+
   useEffect(() => {
     const parent = timelineContainerRef.current?.parentElement;
     if (!parent) {
       return;
     }
 
-    let rafId: number | undefined;
-
-    const isAtBottom = () => parent.scrollTop >= parent.scrollHeight - parent.offsetHeight;
-
-    const stick = () => {
-      if (!isAtBottom()) {
-        parent.scrollTop = parent.scrollHeight - parent.offsetHeight;
-      }
-      rafId = requestAnimationFrame(stick);
-    };
-
-    const unstick = () => {
-      if (rafId) {
-        cancelAnimationFrame(rafId);
-        rafId = undefined;
-      }
-    };
-
-    const onScroll = (event: Event) => {
-      if (isAtBottom()) {
-        stick();
-      } else {
-        unstick();
-      }
-    };
+    function onScroll() {
+      setStickToBottom(isAtBottom(parent!));
+    }
 
     parent.addEventListener('scroll', onScroll);
 
-    stick();
-
     return () => {
-      unstick();
       parent.removeEventListener('scroll', onScroll);
     };
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [timelineContainerRef.current]);
 
+  useEffect(() => {
+    const parent = timelineContainerRef.current?.parentElement;
+    if (!parent) {
+      return;
+    }
+
+    if (stickToBottom) {
+      parent.scrollTop = parent.scrollHeight;
+    }
+  });
+
   const handleCopyConversation = () => {
     const content = JSON.stringify({ title, messages });
 
@@ -210,7 +201,10 @@ export function ChatBody({
             <ChatPromptEditor
               loading={isLoading}
               disabled={!connectors.selectedConnector || !hasCorrectLicense}
-              onSubmit={timeline.onSubmit}
+              onSubmit={(message) => {
+                setStickToBottom(true);
+                return timeline.onSubmit(message);
+              }}
             />
             <EuiSpacer size="s" />
           </EuiPanel>

x-pack/plugins/observability_ai_assistant/public/components/message_panel/message_text.tsx

@@ -16,7 +16,6 @@ import classNames from 'classnames';
 import type { Code, InlineCode, Parent, Text } from 'mdast';
 import React, { useMemo } from 'react';
 import type { Node } from 'unist';
-import { v4 } from 'uuid';
 
 interface Props {
   content: string;
@@ -48,7 +47,10 @@ const cursorCss = css`
 
 const Cursor = () => <span key="cursor" className={classNames(cursorCss, 'cursor')} />;
 
-const CURSOR = `{{${v4()}}}`;
+// a weird combination of different whitespace chars to make sure it stays
+// invisible even when we cannot properly parse the text while still being
+// unique
+const CURSOR = ` ᠎  `;
 
 const loadingCursorPlugin = () => {
   const visitor = (node: Node, parent?: Parent) => {

x-pack/plugins/observability_ai_assistant/public/functions/lens.tsx

@@ -4,13 +4,15 @@
  * 2.0; you may not use this file except in compliance with the Elastic License
  * 2.0.
  */
-import { EuiLoadingSpinner } from '@elastic/eui';
+import { EuiButton, EuiFlexGroup, EuiFlexItem, EuiLoadingSpinner } from '@elastic/eui';
 import type { DataViewsServicePublic } from '@kbn/data-views-plugin/public/types';
 import { FIELD_FORMAT_IDS } from '@kbn/field-formats-plugin/common';
 import { LensAttributesBuilder, XYChart, XYDataLayer } from '@kbn/lens-embeddable-utils';
-import type { LensPublicStart } from '@kbn/lens-plugin/public';
-import React from 'react';
+import type { LensEmbeddableInput, LensPublicStart } from '@kbn/lens-plugin/public';
+import React, { useState } from 'react';
 import useAsync from 'react-use/lib/useAsync';
+import { i18n } from '@kbn/i18n';
+import { Assign } from 'utility-types';
 import type { RegisterFunctionDefinition } from '../../common/types';
 import type {
   ObservabilityAIAssistantPluginStartDependencies,
@@ -56,6 +58,8 @@ function Lens({
     });
   }, [indexPattern]);
 
+  const [isSaveModalOpen, setIsSaveModalOpen] = useState(false);
+
   if (!formulaAsync.value || !dataViewAsync.value) {
     return <EuiLoadingSpinner />;
   }
@@ -68,19 +72,65 @@ function Lens({
     }),
   }).build();
 
+  const lensEmbeddableInput: Assign<LensEmbeddableInput, { attributes: typeof attributes }> = {
+    id: indexPattern,
+    attributes,
+    timeRange: {
+      from: start,
+      to: end,
+      mode: 'relative' as const,
+    },
+  };
+
   return (
-    <lens.EmbeddableComponent
-      id={indexPattern}
-      attributes={attributes}
-      timeRange={{
-        from: start,
-        to: end,
-        mode: 'relative',
-      }}
-      style={{
-        height: 240,
-      }}
-    />
+    <>
+      <EuiFlexGroup direction="column">
+        <EuiFlexItem grow={false}>
+          <EuiFlexGroup direction="row" gutterSize="s" justifyContent="flexEnd">
+            <EuiFlexItem grow={false}>
+              <EuiButton
+                iconType="lensApp"
+                onClick={() => {
+                  lens.navigateToPrefilledEditor(lensEmbeddableInput);
+                }}
+              >
+                {i18n.translate('xpack.observabilityAiAssistant.lensFunction.openInLens', {
+                  defaultMessage: 'Open in Lens',
+                })}
+              </EuiButton>
+            </EuiFlexItem>
+            <EuiFlexItem grow={false}>
+              <EuiButton
+                iconType="save"
+                onClick={() => {
+                  setIsSaveModalOpen(() => true);
+                }}
+              >
+                {i18n.translate('xpack.observabilityAiAssistant.lensFunction.save', {
+                  defaultMessage: 'Save',
+                })}
+              </EuiButton>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+        </EuiFlexItem>
+        <EuiFlexItem>
+          <lens.EmbeddableComponent
+            {...lensEmbeddableInput}
+            style={{
+              height: 240,
+            }}
+          />
+        </EuiFlexItem>
+      </EuiFlexGroup>
+      {isSaveModalOpen ? (
+        <lens.SaveModalComponent
+          initialInput={lensEmbeddableInput}
+          onClose={() => {
+            setIsSaveModalOpen(() => false);
+          }}
+        />
+      ) : null}
+    </>
   );
 }