import 'dart:math';

import 'package:flutter_riverpod/flutter_riverpod.dart';
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 '../data/interfaces/connections_repo_intf.dart';
import '../data/objectbox/objectbox_cache.dart';
import '../data/objectbox/objectbox_connections_repo.dart';
import '../models/auth/profile.dart';
import '../models/connection.dart';
import '../models/exec_error.dart';
import '../models/networking/paging_data.dart';
import '../riverpod_controllers/networking/friendica_trending_client_services.dart';
import 'circles_repo_services.dart';
import 'networking/friendica_relationship_client_services.dart';
import 'persistent_info_services.dart';

part 'connection_manager_services.g.dart';

final _crLogger = Logger('ConnectionsRepoProvider');

@Riverpod(keepAlive: true)
Future<IConnectionsRepo> _connectionsRepo(Ref ref, Profile profile) async {
  _crLogger.info('Creating Connections repo for $profile');
  final objectBox = await ObjectBoxCache.create(
    baseDir: 'profileboxcaches',
    subDir: profile.id,
  );

  _crLogger.info('Object box object returned for $profile');
  return ObjectBoxConnectionsRepo(objectBox);
}

final _crsLogger = Logger('ConnectionsRepoSyncProvider');

@Riverpod(keepAlive: true)
class _ConnectionsRepoSync extends _$ConnectionsRepoSync {
  @override
  Result<IConnectionsRepo, ExecError> build(Profile profile) {
    _crsLogger.info('Build $profile');
    ref.watch(_connectionsRepoProvider(profile).future).then((repo) {
      state = Result.ok(repo);
      ref.notifyListeners();
    });
    return Result.error(ExecError(type: ErrorType.riveprodProviderNotReady));
  }
}

@riverpod
class ConnectionsRepoClearer extends _$ConnectionsRepoClearer {
  @override
  bool build(Profile profile) {
    return true;
  }

  bool clear() {
    return ref
        .read(_connectionsRepoSyncProvider(profile))
        .withResult((repo) => repo.clear())
        .isSuccess;
  }
}

@riverpod
Future<bool> connectionRepoInit(Ref ref, Profile profile) async {
  await ref.read(_connectionsRepoProvider(profile).future);
  return true;
}

@riverpod
List<Connection> knownUsersByName(Ref ref, Profile profile, String userName,
    {Set<ConnectionStatus>? matchingStatus}) {
  return ref.watch(_connectionsRepoSyncProvider(profile)).fold(
      onSuccess: (repo) {
        final knownUsers = repo.getKnownUsersByName(userName);
        if (matchingStatus == null) {
          return knownUsers;
        }

        return knownUsers
            .where((u) => matchingStatus.contains(u.status))
            .toList();
      },
      onError: (_) => []);
}

@riverpod
Future<List<Connection>> myContacts(Ref ref, Profile profile) async {
  final repo = await ref.watch(_connectionsRepoProvider(profile).future);
  return repo.getMyContacts();
}

final _cbiLogger = Logger('ConnectionByIdProvider');

@riverpod
Result<Connection, ExecError> connectionById(
    Ref ref, Profile profile, String id,
    {bool forceUpdate = false}) {
  _cbiLogger.finest('Build for $id for $profile');
  final result = ref
      .watch(_connectionsRepoSyncProvider(profile))
      .andThen((repo) => repo.getById(id))
      .transform((c) {
    if (forceUpdate) {
      ref
          .read(connectionModifierProvider(profile, c).notifier)
          .refreshConnection(true);
    }
    return c;
  }).withError((error) {
    if (error is ExecError &&
        error.type == ErrorType.riveprodProviderNotReady) {
      return;
    }
    final tmpConnection = Connection(id: id);
    ref
        .read(connectionModifierProvider(profile, tmpConnection).notifier)
        .refreshConnection(true);
  }).execErrorCast();

  return result;
}

final _cbhLogger = Logger('ConnectionByHandleProvider');

@riverpod
Result<Connection, ExecError> connectionByHandle(
    Ref ref, Profile profile, String handle) {
  _cbhLogger.finest('Build for $handle for $profile');
  return ref
      .watch(_connectionsRepoSyncProvider(profile))
      .andThen((repo) => repo.getByHandle(handle))
      .execErrorCast();
}

final _cmpLogger = Logger('ConnectionModifierProvider');

@riverpod
class ConnectionModifier extends _$ConnectionModifier {
  @override
  Connection build(Profile profile, Connection connection) {
    return connection;
  }

  Future<void> upsertConnection(Connection update) async {
    final repo = await ref.read(_connectionsRepoProvider(profile).future);

    repo.getById(connection.id).match(
      onSuccess: (original) {
        late final Connection forUpsert;
        if (update.status == ConnectionStatus.unknown) {
          forUpsert = update.copy(status: original.status);
        } else {
          forUpsert = update;
        }

        repo.upsertConnection(
          forUpsert,
        );
        state = forUpsert;
      },
      onError: (_) {
        repo.upsertConnection(update);
        state = update;
      },
    );
    _sendUpdateNotifications();
    return;
  }

  Future<void> acceptFollowRequest() async {
    _cmpLogger.finest(
        'Attempting to accept follow request ${connection.name}: ${connection.status}');

    await ref
        .read(adjudicateFollowProvider(
                profile, connection, FollowAdjudication.authorize)
            .future)
        .match(
      onSuccess: (update) async {
        _cmpLogger
            .finest('Successfully followed ${update.name}: ${update.status}');
        await upsertConnection(update);
      },
      onError: (error) {
        _cmpLogger.severe(
          'Error following ${connection.name}: $error',
          Trace.current(),
        );
      },
    );
  }

  Future<void> rejectFollowRequest() async {
    _cmpLogger.finest(
        'Attempting to accept follow request ${connection.name}: ${connection.status}');
    await ref
        .read(adjudicateFollowProvider(
                profile, connection, FollowAdjudication.reject)
            .future)
        .match(
      onSuccess: (update) async {
        _cmpLogger
            .finest('Successfully followed ${update.name}: ${update.status}');
        await upsertConnection(update);
      },
      onError: (error) {
        _cmpLogger.severe('Error following ${connection.name}: $error');
      },
    );
  }

  Future<void> ignoreFollowRequest() async {
    _cmpLogger.finest(
        'Attempting to accept follow request ${connection.name}: ${connection.status}');
    await ref
        .read(adjudicateFollowProvider(
                profile, connection, FollowAdjudication.ignore)
            .future)
        .match(
      onSuccess: (update) async {
        _cmpLogger
            .finest('Successfully followed ${update.name}: ${update.status}');
        await upsertConnection(update);
      },
      onError: (error) {
        _cmpLogger.severe('Error following ${connection.name}');
      },
    );
  }

  Future<void> follow() async {
    _cmpLogger.finest(
        'Attempting to follow ${connection.name}: ${connection.status}');
    await ref.read(followConnectionProvider(profile, connection).future).match(
      onSuccess: (update) async {
        _cmpLogger
            .finest('Successfully followed ${update.name}: ${update.status}');
        await upsertConnection(update);
      },
      onError: (error) {
        _cmpLogger.severe('Error following ${connection.name}');
      },
    );
  }

  Future<void> unfollow() async {
    _cmpLogger.finest(
        'Attempting to unfollow ${connection.name}: ${connection.status}');
    await ref
        .read(unFollowConnectionProvider(profile, connection).future)
        .match(
      onSuccess: (update) async {
        _cmpLogger
            .finest('Successfully unfollowed ${update.name}: ${update.status}');
        await upsertConnection(update);
      },
      onError: (error) {
        _cmpLogger.severe('Error following ${connection.name}');
      },
    );
  }

  void _sendUpdateNotifications() {
    ref.invalidate(myContactsProvider);
    ref.invalidate(connectionByIdProvider(profile, connection.id));
    ref.invalidate(connectionByHandleProvider(profile, connection.handle));
  }

  Future<void> fullRefresh({
    bool withNotifications = true,
  }) async {
    await ref.read(circlesProvider(profile).notifier).refresh();
    await ref
        .read(circlesProvider(profile).notifier)
        .refreshConnectionCircleData(connection.id, false);
    await ref
        .read(connectionModifierProvider(profile, connection).notifier)
        .refreshConnection(false);
    if (withNotifications) {
      ref.notifyListeners();
    }
  }

  Future<void> refreshConnection(bool withNotification) async {
    _cmpLogger.finest(
        'Refreshing connection data for ${connection.name} with notifications? $withNotification');
    await ref
        .read(connectionWithStatusClientProvider(profile, connection).future)
        .match(
      onSuccess: (update) async {
        await upsertConnection(update);
        if (withNotification) {
          _sendUpdateNotifications();
        }
      },
      onError: (error) {
        _cmpLogger
            .severe('Error getting updates for ${connection.name}: $error');
      },
    );
  }
}

@Riverpod(keepAlive: true)
class _UpdateStatusInternal extends _$UpdateStatusInternal {
  @override
  String build(Profile profile) {
    return '';
  }

  void update(String update) {
    state = update;
  }
}

@riverpod
String updateStatus(Ref ref, Profile profile) {
  return ref.watch(_updateStatusInternalProvider(profile));
}

final _acuLogger = Logger('AllContactsUpdaterProvider');

@Riverpod(keepAlive: true)
class AllContactsUpdater extends _$AllContactsUpdater {
  @override
  bool build(Profile profile) {
    return false;
  }

  Future<void> updateAllContacts(bool backgroundUpdate) async {
    // TODO check if profile is no longer same and stop if it is between pagings and cancel if so
    if (state) {
      _acuLogger.info(
          'updateAllContacts called but believe it is already running so skipping');
      return;
    }
    state = true;
    _acuLogger.info('Updating all contacts');

    final messageStart = backgroundUpdate ? 'Background ' : '';
    final delay = backgroundUpdate
        ? const Duration(minutes: 5)
        : const Duration(seconds: 10);

    ref
        .read(_updateStatusInternalProvider(profile).notifier)
        .update('${messageStart}Updating Connections Data');
    final originalTime = ref.read(persistentInfoProvider(profile));
    await ref
        .read(persistentInfoProvider(profile).notifier)
        .updateLastMyConnectionUpdate(DateTime.now());

    try {
      final results = <String, Connection>{};
      var moreResults = true;
      var maxId = -1;
      const limit = 50;
      var currentPage = const PagingData(limit: limit);
      final originalContacts = Set<Connection>.from(
          ref.read(myContactsProvider(profile)).valueOrNull ?? []);
      num count = 0;
      while (moreResults) {
        await ref
            .read(getMyFollowersProvider(profile, currentPage).future)
            .match(onSuccess: (followers) {
          count += followers.data.length;
          for (final f in followers.data) {
            originalContacts.remove(f);
            final c = f.copy(status: ConnectionStatus.theyFollowYou);
            results[c.id] = c;
            ref
                .read(connectionModifierProvider(profile, c).notifier)
                .upsertConnection(c);
            int id = int.parse(f.id);
            maxId = max(maxId, id);
          }
          if (followers.next != null) {
            currentPage = followers.next!;
          }
          moreResults = followers.next != null;
          ref
              .read(_updateStatusInternalProvider(profile).notifier)
              .update('${messageStart}Updating Followers: $count processed');
        }, onError: (error) {
          _acuLogger.severe(
            'Error getting followers data: $error',
            Trace.current(),
          );
          moreResults = false;
        });

        await Future.delayed(delay);
      }

      moreResults = true;
      currentPage = const PagingData(limit: limit);
      count = 0;
      while (moreResults) {
        await ref
            .read(myFollowingClientProvider(profile, currentPage).future)
            .match(onSuccess: (following) {
          count += following.data.length;
          for (final f in following.data) {
            originalContacts.remove(f);
            final newStatus = results.containsKey(f.id)
                ? ConnectionStatus.mutual
                : ConnectionStatus.youFollowThem;
            final c = f.copy(status: newStatus);
            ref
                .read(connectionModifierProvider(profile, c).notifier)
                .upsertConnection(c);
            int id = int.parse(f.id);
            maxId = max(maxId, id);
          }
          if (following.next != null) {
            currentPage = following.next!;
          }
          moreResults = following.next != null;
          ref
              .read(_updateStatusInternalProvider(profile).notifier)
              .update('${messageStart}Updating Followings: $count processed');
        }, onError: (error) {
          _acuLogger.severe(
            'Error getting your following data: $error',
            Trace.current(),
          );
        });
        await Future.delayed(delay);
      }

      ref
          .read(_updateStatusInternalProvider(profile).notifier)
          .update('${messageStart}Pruning no longer followed contacts');
      for (final noLongerFollowed in originalContacts) {
        final nf = noLongerFollowed.copy(status: ConnectionStatus.none);
        ref
            .read(connectionModifierProvider(profile, nf).notifier)
            .upsertConnection(nf);
      }
      await ref
          .read(persistentInfoProvider(profile).notifier)
          .updateLastMyConnectionUpdate(DateTime.now());
      final contactsLength =
          (ref.read(myContactsProvider(profile)).valueOrNull ?? []).length;
      _acuLogger.info('Done updating # Contacts:$contactsLength');
    } catch (e) {
      _acuLogger.severe(
        'Exception thrown trying to update contacts: $e',
        Trace.current(),
      );
    }
    await ref
        .read(persistentInfoProvider(profile).notifier)
        .updateLastMyConnectionUpdate(originalTime);
    state = false;
  }
}

@riverpod
Future<Result<List<Connection>, ExecError>> suggestedConnections(
    Ref ref, Profile profile) async {
  final result =
      await ref.watch(suggestedConnectionsClientProvider(profile).future);

  await result.withResultAsync((suggestions) async {
    for (final s in suggestions) {
      await ref
          .read(connectionModifierProvider(profile, s).notifier)
          .upsertConnection(s);
    }
  });

  return result;
}