import 'package:logging/logging.dart';
import 'package:result_monad/result_monad.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:stack_trace/stack_trace.dart';

import '../models/auth/profile.dart';
import '../models/exec_error.dart';
import '../models/media_attachment.dart';
import '../models/networking/paging_data.dart';
import '../models/timeline.dart';
import '../models/timeline_entry.dart';
import '../models/timeline_identifiers.dart';
import '../riverpod_controllers/networking/friendica_timelines_client_services.dart';
import 'entry_tree_item_services.dart';

part 'timeline_services.g.dart';

enum TimelineRefreshType {
  refresh,
  loadOlder,
  loadNewer,
}

final _tcLogger = Logger('TimelineCleanerProvider');

@Riverpod(keepAlive: true)
class TimelineMaintainer extends _$TimelineMaintainer {
  @override
  List<TimelineIdentifiers> build(Profile profile) {
    return [];
  }

  void add(TimelineIdentifiers timelineId) {
    _tcLogger.fine('Adding timeline: $timelineId');
    state.add(timelineId);
    ref.notifyListeners();
  }

  void sweep(String statusId) {
    for (final t in state) {
      final result = ref
          .read(timelineManagerProvider(profile, t).notifier)
          .removeTimelineEntry(statusId);
      _tcLogger.finest(
          'Attempting to remove $statusId from $t but was it there? $result');
    }
  }

  void refreshAll() async {
    const typesToRefresh = [
      TimelineType.home,
      TimelineType.global,
      TimelineType.local,
      TimelineType.circle,
    ];

    final nonUserTimelines =
        state.where((t) => typesToRefresh.contains(t.timeline)).toList();
    for (final t in nonUserTimelines) {
      ref.invalidate(timelineManagerProvider(profile, t));
    }
  }

  Future<void> loadNewerForPersonalTimelines() async {
    const standardMyTimelines = [
      TimelineType.home,
      TimelineType.global,
      TimelineType.local,
      TimelineType.self,
    ];
    final openMyTimelines =
        state.where((i) => standardMyTimelines.contains(i.timeline)).toList();
    if (openMyTimelines.isEmpty) {
      _tcLogger.finest(
          'No personal timelines open that need checking for new entries');
    }

    for (final t in openMyTimelines) {
      await ref
          .read(timelineManagerProvider(profile, t).notifier)
          .updateTimeline(TimelineRefreshType.loadNewer);
    }
  }
}

final _tmpLogger = Logger('TimelineManagerProvider');

@Riverpod(keepAlive: true)
class TimelineManager extends _$TimelineManager {
  @override
  Timeline build(Profile profile, TimelineIdentifiers timelineId) {
    _tmpLogger.info('Building for $profile for $timelineId');
    Future.microtask(() async =>
        ref.read(timelineMaintainerProvider(profile).notifier).add(timelineId));
    return Timeline(timelineId);
  }

  Future<void> updateTimeline(
    TimelineRefreshType refreshType,
  ) async {
    _tmpLogger.info(
        'Updating w/$refreshType for timeline $timelineId for profile $profile ');
    late final int lowestId;
    late final int highestId;
    late final InsertionType insertionType;

    switch (refreshType) {
      case TimelineRefreshType.refresh:
        lowestId = 0;
        highestId = 0;
        insertionType = InsertionType.end;
        break;
      case TimelineRefreshType.loadOlder:
        lowestId = state.lowestStatusId;
        highestId = 0;
        insertionType = InsertionType.end;
        break;
      case TimelineRefreshType.loadNewer:
        lowestId = 0;
        highestId = state.highestStatusId;
        insertionType = InsertionType.beginning;
        break;
    }
    (await ref
            .read(timelineUpdaterProvider(profile).notifier)
            .updateTimeline(timelineId, lowestId, highestId))
        .match(onSuccess: (posts) {
      _tmpLogger
          .finest('Posts returned for adding to $timelineId: ${posts.length}');
      final oldState = state;
      final newState = state = state.addOrUpdate(
        posts.map((p) => p.id).toList(),
        insertionType: insertionType,
      );
      _tmpLogger.finest(
          'Old post count: ${oldState.posts.length}, New Post count: ${newState.posts.length}');
      _tmpLogger.finest('Old state == New state? ${oldState == newState}');
    }, onError: (error) {
      _tmpLogger.severe(
        'Error updating timeline: $timelineId}',
        Trace.current(),
      );
    });
  }

  bool removeTimelineEntry(String id) {
    final hadItem = state.removeTimelineEntry(id);
    if (hadItem) {
      ref.notifyListeners();
    }
    _tmpLogger.finest('Remove entry $id? $hadItem');

    return hadItem;
  }
}

@riverpod
class UserMediaTimeline extends _$UserMediaTimeline {
  static const limit = 50;
  var nextPage = const PagingData(limit: limit);
  var media = <MediaAttachment>[];

  @override
  Future<Result<List<MediaAttachment>, ExecError>> build(
      Profile profile, String accountId) async {
    await updateTimeline(reset: true, withNotification: false);
    return Result.ok(media);
  }

  Future<Result<List<MediaAttachment>, ExecError>> updateTimeline(
      {bool reset = true, bool withNotification = true}) async {
    if (reset) {
      nextPage = const PagingData(limit: limit);
      media.clear();
    }

    final result = await ref.watch(
        userMediaTimelineClientProvider(profile, accountId, page: nextPage)
            .future);
    return result
        .withResult((result) {
          for (final entries in result.data) {
            media.addAll(entries.mediaAttachments);
          }
          nextPage = result.next!;
          if (withNotification) {
            ref.notifyListeners();
          }
        })
        .transform((_) => media)
        .execErrorCast();
  }
}

@riverpod
class UserPostsAndCommentsTimeline extends _$UserPostsAndCommentsTimeline {
  static const limit = 50;
  var nextPage = const PagingData(limit: limit);
  var entries = <TimelineEntry>[];

  @override
  Future<Result<List<TimelineEntry>, ExecError>> build(
      Profile profile, String accountId) async {
    await updateTimeline(reset: true, withNotification: false);
    return Result.ok(entries);
  }

  Future<Result<List<TimelineEntry>, ExecError>> updateTimeline(
      {bool reset = true, bool withNotification = true}) async {
    if (reset) {
      nextPage = const PagingData(limit: limit);
      entries.clear();
    }

    final result = await ref.watch(userPostsAndCommentsTimelineClientProvider(
            profile, accountId,
            page: nextPage)
        .future);
    return result
        .withResult((result) {
          entries.addAll(result.data);
          nextPage = result.next!;
          if (withNotification) {
            ref.notifyListeners();
          }
        })
        .transform((_) => entries)
        .execErrorCast();
  }
}