cloudsolutions-atoms/lib/controllers/providers/api/notifications_provider.dart

import 'dart:convert';

import 'package:flutter/cupertino.dart';
import 'package:http/http.dart';

import '../../../models/app_notification.dart';
import '../../../models/user.dart';
import '../../api_routes/urls.dart';

class NotificationsProvider extends ChangeNotifier {
  // number of items call in each request
  final pageItemNumber = 20;

  //reset provider data
  void reset() {
    notifications = null;
    nextPage = true;
    stateCode = null;
  }

  // state code of current request to defied error message
  // like 400 customer request failed
  // 500 service not available
  int? stateCode;

  // true if there is next page in product list and false if not
  bool? nextPage = true;

  // list of user requests
  List<AppNotification>? notifications;

  // when requests in-process _loading = true
  // done _loading = true
  // failed _loading = false
  bool? isLoading;

  /// return -2 if request in progress
  /// return -1 if error happen when sending request
  /// return state code if request complete may be 200, 404 or 403
  /// for more details check http state manager
  /// lib\controllers\http_status_manger\http_status_manger.dart
  Future<int> getNotifications({
    required String host,
    required User user,
    required String hospitalId,
  }) async {
    if (isLoading == true) {
      return -2;
    }
    isLoading = true;
    notifyListeners();
    Response response;
    // userId = 397.toString(); // testing id to view data
    try {
      response = await get(
          Uri.parse(
            "${host + URLs.getNotifications}?uid=${user.id}&token=${user.token}&page=${(notifications?.length ?? 0) ~/ pageItemNumber}",
          ),
          headers: {"Content-Type": "application/json; charset=utf-8"});
      stateCode = response.statusCode;
      if (response.statusCode >= 200 && response.statusCode < 300) {
        // client's request was successfully received
        List requestsListJson = json.decode(utf8.decode(response.bodyBytes));
        List<AppNotification> serviceRequestsPage = requestsListJson
            .map((request) => AppNotification.fromJson(request))
            .toList();
        notifications ??= [];
        notifications?.addAll(serviceRequestsPage);
        if (serviceRequestsPage.length == pageItemNumber) {
          nextPage = true;
        } else {
          nextPage = false;
        }
      }
      isLoading = false;
      notifyListeners();
      return response.statusCode;
    } catch (error) {
      isLoading = false;
      stateCode = -1;
      notifyListeners();
      return -1;
    }
  }

  /// return -2 if request in progress
  /// return -1 if error happen when sending request
  /// return state code if request complete may be 200, 404 or 403
  /// for more details check http state manager
  /// lib\controllers\http_status_manger\http_status_manger.dart
  Future<List<AppNotification>?> getRecentNotifications({
    required String host,
    required User user,
  }) async {
    Response response;
    //userId = 397.toString(); // testing id to view data

    try {
      response = await get(
          Uri.parse(
              "$host${URLs.getNotifications}?uid=${user.id}&token=${user.token}"),
          headers: {"Content-Type": "application/json; charset=utf-8"});

      stateCode = response.statusCode;
      if (response.statusCode >= 200 && response.statusCode < 300) {
        // client's request was successfully received
        List requestsListJson = json.decode(utf8.decode(response.bodyBytes));
        List<AppNotification> recentNotifications = requestsListJson
            .map((request) => AppNotification.fromJson(request))
            .toList();
        return recentNotifications;
      }
      return null;
    } catch (error) {
      return null;
    }
  }
}