'use server';

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

// createFolderAction remains the same...

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

  const file = formData.get("file") as File;
  const description = formData.get("description") as string || "";
  const parentId = formData.get("parentId") as string | null;
  
  // Parse the dynamic metadata from the client
  const customMetadataRaw = formData.get("customMetadata") as string;
  const customMetadata = customMetadataRaw ? JSON.parse(customMetadataRaw) : {};

  if (!file) throw new Error("No file selected");

  const accessToken = await getFreshAccessToken(session.user.id);
  const rootFolder = "WebCalibre";
  const internalId = crypto.randomUUID();

  // 1. Create OneDrive Storage Folder
  const createSubFolderRes = await fetch(`https://graph.microsoft.com/v1.0/me/drive/root:/${rootFolder}:/children`, {
    method: "POST",
    headers: { Authorization: `Bearer ${accessToken}`, "Content-Type": "application/json" },
    body: JSON.stringify({ name: internalId, folder: {} })
  });

  if (!createSubFolderRes.ok) throw new Error("Storage directory creation failed");
  const subFolderData = await createSubFolderRes.json();

  // 2. Upload Session & File Transfer (Existing logic is fine)
  const sessionUrl = `https://graph.microsoft.com/v1.0/me/drive/items/${subFolderData.id}:/${encodeURIComponent(file.name)}:/createUploadSession`;
  const sessionRes = await fetch(sessionUrl, {
    method: "POST",
    headers: { Authorization: `Bearer ${accessToken}`, "Content-Type": "application/json" },
    body: JSON.stringify({ item: { "@microsoft.graph.conflictBehavior": "replace" } })
  });
  const { uploadUrl } = await sessionRes.json();
  const buffer = Buffer.from(await file.arrayBuffer());
  await fetch(uploadUrl, {
    method: "PUT",
    headers: { "Content-Length": `${file.size}`, "Content-Range": `bytes 0-${file.size - 1}/${file.size}` },
    body: buffer
  });

  // 3. Final Database Record with Merged Metadata
  const extension = file.name.split('.').pop()?.toUpperCase() || "UNKNOWN";

  await prisma.fileNode.create({
    data: {
      id: internalId,
      name: file.name,
      description: description,
      size: BigInt(file.size),
      isFolder: false,
      path: `/${rootFolder}/${internalId}/${file.name}`,
      ownerId: session.user.id,
      parentId: parentId || null,
      metadata: { 
        ...customMetadata, // User's dynamic keys (Latitude, Author, etc.)
        type: extension,   // System keys (preserved for UI icons)
        mimeType: file.type 
      }
    }
  });

  revalidatePath("/dashboard");
  return { success: true };
}