import 'package:nextcloud/nextcloud.dart';

import '../files_sharing/file_sharing_api.dart';
import '../files_sharing/file_sharing_api_params.dart';
import '../webdav/webdav_api.dart';

/// WebDAV folder under which Talk-shared files are uploaded before being
/// linked into a chat.
const String talkShareFolder = 'MarianumMobile';

Future<void>? _shareFolderReady;

/// Creates [talkShareFolder] if it is missing, at most once per session — the
/// folder is permanent, so every later upload would just pay a round trip to
/// be told it already exists (WebDAV answers MKCOL on an existing collection
/// with 405, which is the normal case here and must not surface as an error).
Future<void> ensureTalkShareFolder() =>
    _shareFolderReady ??= _createTalkShareFolder();

Future<void> _createTalkShareFolder() async {
  try {
    final webdav = await WebdavApi.webdav;
    await webdav.mkcol(PathUri.parse('/$talkShareFolder'));
  } on DynamiteApiException catch (e) {
    // Anything but "already exists" leaves the folder unconfirmed, so the next
    // upload has to try again.
    if (e.statusCode != 405) _shareFolderReady = null;
  } catch (_) {
    _shareFolderReady = null;
  }
}

/// Posts each already-uploaded WebDAV path as a Talk share (ShareType 10) to
/// the given conversation token. Calls run concurrently — the server accepts
/// parallel posts and the picker UI is blocked anyway, so we shouldn't pay
/// O(n*RTT) latency per share.
Future<void> shareFilesToChat({
  required String token,
  required List<String> remoteFilePaths,
}) => Future.wait(
  remoteFilePaths.map(
    (path) => FileSharingApi().share(
      FileSharingApiParams(shareType: 10, shareWith: token, path: path),
    ),
  ),
);