multi-file update

src/app/api/reports/[id]/export/route.ts

@@ -5,7 +5,7 @@ export const runtime = "nodejs";
 import { getServerSession } from "next-auth/next";
 import { authOptions } from "@/lib/auth";
 import { prisma } from "@/lib/prisma";
-import { uploadToDrive, generateReportMarkdown } from "@/lib/google-drive";
+import { uploadToDrive, updateDriveFile, generateReportMarkdown } from "@/lib/google-drive";
 
 export async function POST(
   req: Request,
@@ -46,17 +46,23 @@ export async function POST(
   });
 
   try {
-    const driveFile = await uploadToDrive(
-        account.access_token,
-        fileName,
-        markdown,
-        folderSetting?.value
-    );
-    
-    // Update report status to SUBMITTED
+    let driveFile;
+
+    if (report.driveFileId) {
+      // Update the existing Drive file in place
+      driveFile = await updateDriveFile(account.access_token, report.driveFileId, markdown);
+    } else {
+      // First export — create a new Drive file and store its ID
+      driveFile = await uploadToDrive(account.access_token, fileName, markdown, folderSetting?.value);
+      await prisma.report.update({
+        where: { id },
+        data: { driveFileId: driveFile.id },
+      });
+    }
+
     await prisma.report.update({
       where: { id },
-      data: { status: 'SUBMITTED' }
+      data: { status: 'SUBMITTED' },
     });
 
     return NextResponse.json({ success: true, link: driveFile.webViewLink });