import { createClient } from "webdav";

/**

 * Resolves a Nextcloud file path from its fileid.

 */

export async function main(

  ncResource: RT.Nextcloud,

  fileid: string

): Promise<string> {

  const baseUrl = ncResource.baseUrl;

  const davBaseUrl = `${baseUrl}/remote.php/dav`;

  const client = createClient(davBaseUrl, {

    username: ncResource.userId,

    password: ncResource.token,

  });

  const searchXml = buildSearchRequestXml(ncResource.userId, fileid);

  const rawResponse = await client.customRequest("/", {

    method: "SEARCH",

    data: searchXml,

    headers: {

      "Content-Type": "text/xml; charset=utf-8",

      Accept: "application/xml, text/xml",

    },

    responseType: "text",

  });

  const responseXml = await rawResponse.text();

  const path = extractPathFromSearchResponse(responseXml, ncResource.userId);

  if (!path) {

    throw new Error(`Could not resolve path for fileid "${fileid}"`);

  }

  return path;

}

function buildSearchRequestXml(userId: string, fileId: string): string {

  return `<?xml version="1.0" encoding="UTF-8"?>

<d:searchrequest xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns">

  <d:basicsearch>

    <d:select>

      <d:prop>

        <d:displayname/>

        <oc:fileid/>

      </d:prop>

    </d:select>

    <d:from>

      <d:scope>

        <d:href>/files/${encodeURIComponent(userId)}</d:href>

        <d:depth>infinity</d:depth>

      </d:scope>

    </d:from>

    <d:where>

      <d:eq>

        <d:prop><oc:fileid/></d:prop>

        <d:literal>${encodeURIComponent(fileId)}</d:literal>

      </d:eq>

    </d:where>

  </d:basicsearch>

</d:searchrequest>`;

}

function extractPathFromSearchResponse(xml: string, userId: string): string | null {

  const hrefRegex = /<d:href>(.*?)<\/d:href>/g;

  let match: RegExpExecArray | null = null;

  while ((match = hrefRegex.exec(xml)) !== null) {

    console.log(match[1]);

    const href = decodeURIComponent(match[1] || "").trim();

    if (!href) continue;

    // Expected shape: /remote.php/dav/files/{userId}/path/to/file

    const marker = `/files/${userId}/`;

    const markerIndex = href.indexOf(marker);

    if (markerIndex !== -1) {

      return `/${href.slice(markerIndex + marker.length)}`;

    }

  }

  return null;

}