import 'dart:async';

import 'package:collection/collection.dart';
import 'package:youtube_explode_dart/src/reverse_engineering/responses/channel_upload_page.dart';

import '../../youtube_explode_dart.dart';
import '../extensions/helpers_extension.dart';

/// This list contains a channel uploads.
/// This behaves like a [List] but has the [SearchList.nextPage] to get the next batch of videos.
class ChannelUploadsList extends DelegatingList<Video> {
  final ChannelUploadPage _page;
  final YoutubeHttpClient _httpClient;

  final String author;
  final ChannelId channel;

  /// Construct an instance of [SearchList]
  /// See [SearchList]
  ChannelUploadsList(
      List<Video> base, this.author, this.channel, this._page, this._httpClient)
      : super(base);

  /// Fetches the next batch of videos or returns null if there are no more
  /// results.
  Future<ChannelUploadsList?> nextPage() async {
    final page = await _page.nextPage(_httpClient);
    if (page == null) {
      return null;
    }
    return ChannelUploadsList(
        page.initialData.uploads
            .map((e) => Video(
                e.videoId,
                e.videoTitle,
                author,
                channel,
                e.videoUploadDate.toDateTime(),
                null,
                '',
                e.videoDuration,
                ThumbnailSet(e.videoId.value),
                null,
                Engagement(e.videoViews, null, null),
                false))
            .toList(),
        author,
        channel,
        page,
        _httpClient);
  }
}