Refactor useMessage hook and remove unused code

src/loader/pdf.ts

@@ -0,0 +1,37 @@
+import { BaseDocumentLoader } from "langchain/document_loaders/base"
+import { Document } from "@langchain/core/documents"
+export interface WebLoaderParams {
+    pdf: { content: string, page: number }[]
+    url: string
+}
+
+export class PageAssistPDFLoader
+    extends BaseDocumentLoader
+    implements WebLoaderParams {
+    pdf: { content: string, page: number }[]
+    url: string
+
+    constructor({ pdf, url }: WebLoaderParams) {
+        super()
+        this.pdf = pdf
+        this.url = url
+    }
+
+    async load(): Promise<Document<Record<string, any>>[]> {
+        const documents: Document[] = [];
+
+        for (const page of this.pdf) {
+            const metadata = { source: this.url, page: page.page }
+            documents.push(new Document({ pageContent: page.content, metadata }))
+        }
+
+        return [
+            new Document({
+                pageContent: documents.map((doc) => doc.pageContent).join("\n\n"),
+                metadata: documents.map((doc) => doc.metadata),
+            }),
+        ];
+
+
+    }
+}