get_events_command.dart

// Dart imports:
import 'dart:convert';

// Package imports:
import 'package:http/http.dart' as http;

// Project imports:
import 'package:notredame/features/ets/events/api-client/hello_api_client.dart';
import 'package:notredame/features/ets/events/api-client/models/paginated_news.dart';
import 'package:notredame/utils/command.dart';
import 'package:notredame/utils/http_exception.dart';

/// Call the Hello API to get the news
/// [startDate] The start date of the news (optional)
/// [endDate] The end date of the news (optional)
/// [tags] The tags of the news (optional)
/// [activityAreas] The activity areas of the news (optional)
/// [organizerId] The organizer id (optional)
/// [title] The news title (optional)
/// [pageNumber] The page number (default: 1)
/// [pageSize] The page size (default: 10)
class GetEventsCommand implements Command<PaginatedNews> {
  final HelloAPIClient client;
  final http.Client _httpClient;
  final DateTime? startDate;
  final DateTime? endDate;
  final List<String>? tags;
  final List<String>? activityAreas;
  final String? organizerId;
  final String? title;
  final int pageNumber;
  final int pageSize;

  GetEventsCommand(
    this.client,
    this._httpClient, {
    this.startDate,
    this.endDate,
    this.tags,
    this.activityAreas,
    this.organizerId,
    this.title,
    this.pageNumber = 1,
    this.pageSize = 10,
  });

  @override
  Future<PaginatedNews> execute() async {
    if (client.apiLink == null || client.apiLink!.isEmpty) {
      throw ArgumentError("_apiLink is null or empty");
    }
    final query = {
      'pageNumber': pageNumber.toString(),
      'pageSize': pageSize.toString(),
    };

    if (startDate != null) {
      query['startDate'] = startDate!.toUtc().toIso8601String();
    }
    if (endDate != null) {
      query['endDate'] = endDate!.toUtc().toIso8601String();
    }
    if (tags != null) {
      query['tags'] = tags.toString();
    }
    if (activityAreas != null) {
      query['activityAreas'] = activityAreas.toString();
    }
    if (organizerId != null) {
      query['organizerId'] = organizerId!;
    }
    if (title != null) {
      query['title'] = title!;
    }

    final uri = Uri.https(client.apiLink!, '/api/events');
    final response = await _httpClient.get(uri.replace(queryParameters: query));

    // Log the http error and throw a exception
    if (response.statusCode != 200) {
      throw HttpException(
        message: response.body,
        prefix: HelloAPIClient.tagError,
        code: response.statusCode,
      );
    }

    return PaginatedNews.fromJson(
        jsonDecode(response.body) as Map<String, dynamic>);
  }
}