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/connection.dart';
import '../models/exec_error.dart';
import '../models/networking/paged_response.dart';
import '../models/networking/paging_data.dart';
import 'connection_manager_services.dart';
import 'networking/friendica_relationship_client_services.dart';

part 'blocks_services.g.dart';

final _logger = Logger('BlocksManager');

@Riverpod(keepAlive: true)
class BlocksManager extends _$BlocksManager {
  final _pages = <PagedResponse>[];

  @override
  Future<List<Connection>> build(Profile profile) async {
    final result = await updateBlocks(withUpdate: false);
    return result;
  }

  FutureResult<Connection, ExecError> blockConnection(
      Connection connection) async {
    _logger
        .fine('Attempting to block ${connection.name}: ${connection.status}');
    final blocks = List<Connection>.from(state.value ?? []);
    final result = await ref
        .read(blockConnectionProvider(profile, connection).future)
        .withResultAsync((blockedUser) async {
      await ref
          .read(connectionModifierProvider(profile, blockedUser).notifier)
          .upsertConnection(blockedUser);
    });
    result.match(
      onSuccess: (blockedUser) {
        _logger.fine(
            'Successfully blocked ${blockedUser.name}: ${blockedUser.status}');
        final existingIndex = blocks.indexOf(connection);
        if (existingIndex < 0) {
          blocks.add(blockedUser);
          _sortBlocks(blocks);
        } else {
          blocks.removeAt(existingIndex);
          blocks.insert(existingIndex, blockedUser);
        }
      },
      onError: (error) {
        _logger.severe(
            'Error blocking ${connection.name}: $error', Trace.current());
      },
    );

    state = AsyncData(blocks);
    return result.execErrorCast();
  }

  FutureResult<Connection, ExecError> unblockConnection(
      Connection connection) async {
    _logger
        .fine('Attempting to unblock ${connection.name}: ${connection.status}');
    final blocks = List<Connection>.from(state.value ?? []);
    final result = await ref
        .read(unblockConnectionProvider(profile, connection).future)
        .withResultAsync((unblocked) async {
      await ref
          .read(connectionModifierProvider(profile, unblocked).notifier)
          .upsertConnection(unblocked);
    });
    result.match(
      onSuccess: (unblockedUser) {
        _logger.fine(
            'Successfully unblocked ${unblockedUser.name}: ${unblockedUser.status}');
        final existingIndex = blocks.indexOf(connection);
        if (existingIndex >= 0) {
          blocks.removeAt(existingIndex);
          _sortBlocks(blocks);
        }
      },
      onError: (error) {
        _logger.severe('Error unblocking ${connection.name}: $error');
      },
    );
    state = AsyncData(blocks);

    return result.execErrorCast();
  }

  Future<void> updateBlock(Connection connection) async {
    final blocks = List<Connection>.from(state.value ?? []);
    final id = int.parse(connection.id);
    final page = PagingData(minId: id - 1, maxId: id + 1);

    await ref
        .read(blocksClientProvider(profile, page).future)
        .withResultAsync((returnedBlocks) async {
      final conBlock =
          returnedBlocks.data.where((b) => b.id == connection.id).toList();
      if (conBlock.isEmpty) {
        blocks.remove(connection);
        await ref
            .read(connectionModifierProvider(profile, connection).notifier)
            .refreshConnection(true);
      } else {
        blocks.add(conBlock.first);
        await ref
            .read(connectionModifierProvider(profile, conBlock.first).notifier)
            .upsertConnection(conBlock.first);
      }
    });

    state = AsyncData(blocks);
  }

  Future<List<Connection>> updateBlocks({
    bool nextOnly = false,
    bool withUpdate = true,
  }) async {
    final blocks = state.value ?? [];
    if (!nextOnly) {
      blocks.clear();
      _pages.clear();
    }
    final bootstrapping = _pages.isEmpty;

    var page = bootstrapping ? PagingData() : _pages.last.next;

    while (page != null) {
      page = await ref
          .read(blocksClientProvider(profile, page).future)
          .withResult((result) {
            blocks.addAll(result.data);
            _pages.add(result);
          })
          .withError(
            (error) => _logger.severe('Error getting blocks data: $error'),
          )
          .fold<PagingData?>(
            onSuccess: (result) => result.next,
            onError: (error) => null,
          );

      if (nextOnly) {
        break;
      }
    }

    for (final b in blocks) {
      await ref
          .read(connectionModifierProvider(profile, b).notifier)
          .upsertConnection(b);
    }

    _sortBlocks(blocks);
    if (withUpdate) {
      state = AsyncData(blocks);
    }

    return blocks;
  }
}

void _sortBlocks(List<Connection> blocks) {
  blocks.sort(
    (b1, b2) => b1.name.toLowerCase().compareTo(
          b2.name.toLowerCase(),
        ),
  );
}