import { createClient, FileStat } from "webdav";

type Nextcloud = {

  baseUrl: string;

  userId: string;

  token: string;

};

/**

 * Lists files in a Nextcloud folder via WebDAV.

 * Optionally filter results by content type (e.g. "application/pdf" or ["image/jpeg", "image/png"]).

 */

export async function main(

  ncResource: Nextcloud,

  folderPath: string,

  contentTypesFilter: string | string[] | null = null,

  recursive: boolean = false

): Promise<FileStat[]> {

  const baseUrl = ncResource.baseUrl.replace(/\/$/, "");

  const davBaseUrl = `${baseUrl}/remote.php/dav/files/${encodeURIComponent(ncResource.userId)}`;

  const client = createClient(davBaseUrl, {

    username: ncResource.userId,

    password: ncResource.token,

  });

  let path = `${folderPath}/`;

  if (path.startsWith("/")) {

    path = path.slice(1);

  }

  const items = await client.getDirectoryContents(path, {

    deep: recursive,

  });

  const contentTypes = normalizeContentFilter(contentTypesFilter);

  if (contentTypes.length === 0) {

    return items;

  }

  return items.filter((item) =>

    contentTypes.includes((item.mime || "").toLowerCase())

  );

}

function normalizeContentFilter(

  filter: string | string[] | null

): string[] {

  if (filter == null || filter === "") return [];

  if (Array.isArray(filter)) {

    return filter.map((f) => String(f).trim().toLowerCase()).filter(Boolean);

  }

  return [String(filter).trim().toLowerCase()].filter(Boolean);

}