'use server';
import { auth } from "@/auth";
import { prisma } from "@/lib/prisma";
import { revalidatePath } from "next/cache";
import { getFreshAccessToken } from "@/lib/auth-utils";

export async function syncOneDrive() {
  const session = await auth();
  if (!session?.user?.id) throw new Error("Unauthorized");

  try {
    const accessToken = await getFreshAccessToken(session.user.id);
    const response = await fetch("https://graph.microsoft.com/v1.0/me/drive/root:/WebCalibre:/children", {
      headers: { Authorization: `Bearer ${accessToken}` },
    });
    
    if (!response.ok) return { success: true, count: 0 };

    const data = await response.json();
    let syncedCount = 0;
    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

    for (const item of data.value) {
      const isFolder = !!item.folder;

      // Only skip if it's a folder AND it's a UUID (storage container)
      // If a user named a file with a UUID, we still want it.
      if (isFolder && uuidRegex.test(item.name)) {
        continue;
      }

      const extension = isFolder ? 'FOLDER' : (item.name.split('.').pop()?.toUpperCase() || 'UNKNOWN');

      await prisma.fileNode.upsert({
        where: { oneDriveId: item.id }, // Primary match
        update: {
          name: item.name,
          size: BigInt(item.size || 0),
          isFolder: isFolder,
          path: item.parentReference?.path + '/' + item.name,
          updatedAt: new Date(),
        },
        create: {
          id: crypto.randomUUID(), 
          oneDriveId: item.id,
          name: item.name,
          size: BigInt(item.size || 0),
          isFolder: isFolder,
          path: item.parentReference?.path + '/' + item.name,
          ownerId: session.user.id,
          metadata: { type: extension, mimeType: item.file?.mimeType || null },
        }
      });
      syncedCount++;
    }
    
    revalidatePath('/dashboard');
    return { success: true, count: syncedCount };
  } catch (error: any) {
    throw new Error(error.message);
  }
}