refactor: refactor agent api route

app/api/langchain-tools/nodejs_tools.ts

@@ -0,0 +1,35 @@
+import { BaseLanguageModel } from "langchain/dist/base_language";
+import { PDFBrowser } from "@/app/api/langchain-tools/pdf_browser";
+
+import { Embeddings } from "langchain/dist/embeddings/base.js";
+
+export class NodeJSTool {
+  private apiKey: string | undefined;
+
+  private baseUrl: string;
+
+  private model: BaseLanguageModel;
+
+  private embeddings: Embeddings;
+
+  private callback?: (data: string) => Promise<void>;
+
+  constructor(
+    apiKey: string | undefined,
+    baseUrl: string,
+    model: BaseLanguageModel,
+    embeddings: Embeddings,
+    callback?: (data: string) => Promise<void>,
+  ) {
+    this.apiKey = apiKey;
+    this.baseUrl = baseUrl;
+    this.model = model;
+    this.embeddings = embeddings;
+    this.callback = callback;
+  }
+
+  async getCustomTools(): Promise<any[]> {
+    const pdfBrowserTool = new PDFBrowser(this.model, this.embeddings);
+    return [pdfBrowserTool];
+  }
+}