feat(tavily): integrate Tavily search engine with configuration and UI support

src/lib/search/metaSearchAgent.ts

@@ -17,7 +17,9 @@ import LineListOutputParser from '../outputParsers/listLineOutputParser';
 import LineOutputParser from '../outputParsers/lineOutputParser';
 import { getDocumentsFromLinks } from '../utils/documents';
 import { Document } from 'langchain/document';
+import { searchTavily } from '../tavily';
 import { searchSearxng } from '../searxng';
+import { getSearchEngine } from '../config';
 import path from 'node:path';
 import fs from 'node:fs';
 import computeSimilarity from '../utils/computeSimilarity';
@@ -205,25 +207,47 @@ class MetaSearchAgent implements MetaSearchAgentType {
         } else {
           question = question.replace(/<think>.*?<\/think>/g, '');
 
-          const res = await searchSearxng(question, {
-            language: 'en',
-            engines: this.config.activeEngines,
-          });
+          const searchEngine = getSearchEngine();
+          console.log(`Using search engine: ${searchEngine}`);
 
-          const documents = res.results.map(
-            (result) =>
-              new Document({
-                pageContent:
-                  result.content ||
-                  (this.config.activeEngines.includes('youtube')
-                    ? result.title
-                    : '') /* Todo: Implement transcript grabbing using Youtubei (source: https://www.npmjs.com/package/youtubei) */,
-                metadata: {
-                  title: result.title,
-                  url: result.url,
-                  ...(result.img_src && { img_src: result.img_src }),
-                },
-              }),
+          let res;
+          
+          if (searchEngine === 'tavily') {
+            res = await searchTavily(question, {
+              search_depth: 'basic',
+              max_results: 15,
+              include_images: true,
+            });
+          } else {
+            // Default to SearxNG
+            res = await searchSearxng(question, {
+              language: 'en',
+              engines: this.config.activeEngines,
+            });
+          }
+
+          // If we have an AI-generated answer from Tavily, create a document for it
+          let documents: Document[] = [];
+          
+          
+
+          // Add the regular search results
+          documents = documents.concat(
+            res.results.map(
+              (result) =>
+                new Document({
+                  pageContent:
+                    result.content ||
+                    (this.config.activeEngines.includes('youtube')
+                      ? result.title
+                      : ''),
+                  metadata: {
+                    title: result.title,
+                    url: result.url,
+                    ...(result.img_src ? { img_src: result.img_src } : {}),
+                  },
+                }),
+            )
           );
 
           return { query: question, docs: documents };