import 'dart:convert';

import 'package:http/http.dart' as http;
import 'package:logging/logging.dart';
import 'package:result_monad/result_monad.dart';

import 'models/TimelineIdentifiers.dart';
import 'models/connection.dart';
import 'models/credentials.dart';
import 'models/exec_error.dart';
import 'models/timeline_entry.dart';
import 'models/user_notification.dart';
import 'serializers/friendica/connection_friendica_extensions.dart';
import 'serializers/mastodon/notification_mastodon_extension.dart';
import 'serializers/mastodon/timeline_entry_mastodon_extensions.dart';

class FriendicaClient {
  static final _logger = Logger('$FriendicaClient');
  final Credentials _credentials;
  late final String _authHeader;

  String get serverName => _credentials.serverName;

  Credentials get credentials => _credentials;

  FriendicaClient({required Credentials credentials})
      : _credentials = credentials {
    final authenticationString =
        "${_credentials.username}:${_credentials.password}";
    final encodedAuthString = base64Encode(utf8.encode(authenticationString));
    _authHeader = "Basic $encodedAuthString";
  }

  FutureResult<List<UserNotification>, ExecError> getNotifications() async {
    final url = 'https://$serverName/api/v1/notifications?include_all=true';
    final request = Uri.parse(url);
    _logger.finest(() => 'Getting new notifications');
    return (await _getApiListRequest(request).andThenSuccessAsync(
            (notificationsJson) async => notificationsJson
                .map((json) => NotificationMastodonExtension.fromJson(json))
                .toList()))
        .mapError((error) {
      if (error is ExecError) {
        return error;
      }

      return ExecError(type: ErrorType.localError, message: error.toString());
    });
  }

  FutureResult<bool, ExecError> clearNotifications() async {
    final url = 'https://$serverName/api/v1/notifications/clear';
    final request = Uri.parse(url);
    _logger.finest(() => 'Clearing unread notification');
    final response = await _postUrl(request, {});
    return response.mapValue((value) => true);
  }

  FutureResult<bool, ExecError> clearNotification(
      UserNotification notification) async {
    final url =
        'https://$serverName/api/v1/notifications/${notification.id}/dismiss';
    final request = Uri.parse(url);
    _logger.finest(() => 'Clearing unread notification for $notification');
    final response = await _postUrl(request, {});
    return response.mapValue((value) => true);
  }

  FutureResult<List<TimelineEntry>, ExecError> getUserTimeline(
      {String userId = '', int page = 1, int count = 10}) async {
    _logger.finest(() => 'Getting user timeline for $userId');
    final baseUrl = 'https://$serverName/api/statuses/user_timeline?';
    final pagingData = 'count=$count&page=$page';
    final url = userId.isEmpty
        ? '$baseUrl$pagingData'
        : '${baseUrl}screen_name=$userId$pagingData';
    final request = Uri.parse(url);
    return (await _getApiListRequest(request).andThenSuccessAsync(
            (postsJson) async => postsJson
                .map((json) => TimelineEntryMastodonExtensions.fromJson(json))
                .toList()))
        .mapError((error) => error as ExecError);
  }

  FutureResult<List<TimelineEntry>, ExecError> getTimeline(
      {required TimelineIdentifiers type,
      int sinceId = 0,
      int maxId = 0,
      int limit = 20}) async {
    final String timelinePath = _typeToTimelinePath(type);
    final String timelineQPs = _typeToTimelineQueryParameters(type);
    final baseUrl = 'https://$serverName/api/v1/$timelinePath';
    var pagingData = 'limit=$limit';
    if (maxId > 0) {
      pagingData = '$pagingData&max_id=$maxId';
    }

    if (sinceId > 0) {
      pagingData = '&since_id=$sinceId';
    }

    final url = '$baseUrl?exclude_replies=true&$pagingData&$timelineQPs';
    final request = Uri.parse(url);
    _logger.finest(() =>
        'Getting ${type.toHumanKey()} limit $limit sinceId: $sinceId maxId: $maxId : $url');
    return (await _getApiListRequest(request).andThenSuccessAsync(
            (postsJson) async => postsJson
                .map((json) => TimelineEntryMastodonExtensions.fromJson(json))
                .toList()))
        .mapError((error) => error as ExecError);
  }

  FutureResult<List<TimelineEntry>, ExecError> getPostOrComment(String id,
      {bool fullContext = false}) async {
    return (await runCatchingAsync(() async {
      final baseUrl = 'https://$serverName/api/v1/statuses/$id';
      final url = fullContext ? '$baseUrl/context' : baseUrl;
      final request = Uri.parse(url);
      _logger.finest(() =>
          'Getting entry for status $id, full context? $fullContext : $url');
      return (await _getApiRequest(request).andThenSuccessAsync((json) async {
        if (fullContext) {
          final ancestors = json['ancestors'] as List<dynamic>;
          final descendants = json['descendants'] as List<dynamic>;
          final items = [
            ...ancestors
                .map((a) => TimelineEntryMastodonExtensions.fromJson(a)),
            ...descendants
                .map((d) => TimelineEntryMastodonExtensions.fromJson(d))
          ];
          return items;
        } else {
          return [TimelineEntryMastodonExtensions.fromJson(json)];
        }
      }));
    }))
        .mapError((error) => ExecError(
              type: ErrorType.parsingError,
              message: error.toString(),
            ));
  }

  FutureResult<TimelineEntry, ExecError> createNewStatus(
      {required String text,
      String spoilerText = '',
      String inReplyToId = ''}) async {
    _logger.finest(() =>
        'Creating status ${inReplyToId.isNotEmpty ? "In Reply to: " : ""} $inReplyToId');
    final url = Uri.parse('https://$serverName/api/v1/statuses');
    final body = {
      'status': text,
      if (spoilerText.isNotEmpty) 'spoiler_text': spoilerText,
      if (inReplyToId.isNotEmpty) 'in_reply_to_id': inReplyToId,
    };
    final result = await _postUrl(url, body);
    if (result.isFailure) {
      return result.errorCast();
    }

    final responseText = result.value;

    return runCatching<TimelineEntry>(() {
      final json = jsonDecode(responseText);
      return Result.ok(TimelineEntryMastodonExtensions.fromJson(json));
    }).mapError((error) {
      return ExecError(type: ErrorType.parsingError, message: error.toString());
    });
  }

  FutureResult<TimelineEntry, ExecError> resharePost(String id) async {
    _logger.finest(() => 'Reshare post $id');
    final url = Uri.parse('https://$serverName/api/v1/statuses/$id/reblog');
    final result = await _postUrl(url, {});
    if (result.isFailure) {
      return result.errorCast();
    }

    final responseText = result.value;

    return runCatching<TimelineEntry>(() {
      final json = jsonDecode(responseText);
      return Result.ok(TimelineEntryMastodonExtensions.fromJson(json));
    }).mapError((error) {
      return ExecError(type: ErrorType.parsingError, message: error.toString());
    });
  }

  FutureResult<TimelineEntry, ExecError> unResharePost(String id) async {
    _logger.finest(() => 'Reshare post $id');
    final url = Uri.parse('https://$serverName/api/v1/statuses/$id/unreblog');
    final result = await _postUrl(url, {});
    if (result.isFailure) {
      return result.errorCast();
    }

    final responseText = result.value;

    return runCatching<TimelineEntry>(() {
      final json = jsonDecode(responseText);
      return Result.ok(TimelineEntryMastodonExtensions.fromJson(json));
    }).mapError((error) {
      return ExecError(type: ErrorType.parsingError, message: error.toString());
    });
  }

  FutureResult<TimelineEntry, ExecError> changeFavoriteStatus(
      String id, bool status) async {
    final action = status ? 'favourite' : 'unfavourite';
    final url = Uri.parse('https://$serverName/api/v1/statuses/$id/$action');
    final result = await _postUrl(url, {});
    if (result.isFailure) {
      return result.errorCast();
    }

    final responseText = result.value;

    return runCatching<TimelineEntry>(() {
      final json = jsonDecode(responseText);
      return Result.ok(TimelineEntryMastodonExtensions.fromJson(json));
    }).mapError((error) {
      return ExecError(type: ErrorType.parsingError, message: error.toString());
    });
  }

  FutureResult<Connection, ExecError> getMyProfile() async {
    _logger.finest(() => 'Getting logged in user profile');
    final request = Uri.parse('https://$serverName/api/friendica/profile/show');
    return (await _getApiRequest(request)).mapValue((json) =>
        ConnectionFriendicaExtensions.fromJson(json['friendica_owner'])
            .copy(status: ConnectionStatus.you, network: 'friendica'));
  }

  FutureResult<String, ExecError> _getUrl(Uri url) async {
    _logger.finest('GET: $url');
    try {
      final response = await http.get(
        url,
        headers: {
          'Authorization': _authHeader,
          'Content-Type': 'application/json; charset=UTF-8'
        },
      );

      if (response.statusCode != 200) {
        return Result.error(ExecError(
            type: ErrorType.authentication,
            message: '${response.statusCode}: ${response.reasonPhrase}'));
      }
      return Result.ok(utf8.decode(response.bodyBytes));
    } catch (e) {
      return Result.error(
          ExecError(type: ErrorType.localError, message: e.toString()));
    }
  }

  FutureResult<String, ExecError> _postUrl(
      Uri url, Map<String, dynamic> body) async {
    _logger.finest('POST: $url');
    try {
      final response = await http.post(
        url,
        headers: {
          'Authorization': _authHeader,
          'Content-Type': 'application/json; charset=UTF-8'
        },
        body: jsonEncode(body),
      );

      if (response.statusCode != 200) {
        return Result.error(ExecError(
            type: ErrorType.authentication,
            message: '${response.statusCode}: ${response.reasonPhrase}'));
      }
      return Result.ok(response.body);
    } catch (e) {
      return Result.error(
          ExecError(type: ErrorType.localError, message: e.toString()));
    }
  }

  FutureResult<List<dynamic>, ExecError> _getApiListRequest(Uri url) async {
    return (await _getUrl(url).andThenSuccessAsync(
            (jsonText) async => jsonDecode(jsonText) as List<dynamic>))
        .mapError((error) => error as ExecError);
  }

  FutureResult<dynamic, ExecError> _getApiRequest(Uri url) async {
    return (await _getUrl(url)
            .andThenSuccessAsync((jsonText) async => jsonDecode(jsonText)))
        .mapError((error) => error as ExecError);
  }

  String _typeToTimelinePath(TimelineIdentifiers type) {
    switch (type.timeline) {
      case TimelineType.home:
        return 'timelines/home';
      case TimelineType.global:
        return 'timelines/public';
      case TimelineType.local:
        return 'timelines/public';
      case TimelineType.tag:
      case TimelineType.profile:
        return '/accounts/${type.auxData}/statuses';
      case TimelineType.self:
        throw UnimplementedError('These types are not supported yet');
    }
  }

  String _typeToTimelineQueryParameters(TimelineIdentifiers type) {
    switch (type.timeline) {
      case TimelineType.home:
      case TimelineType.global:
      case TimelineType.profile:
        return '';
      case TimelineType.local:
        return 'local=true';
      case TimelineType.tag:
      case TimelineType.self:
        throw UnimplementedError('These types are not supported yet');
    }
  }
}