import 'dart:convert'; import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:http/http.dart'; import '../../../models/hospital.dart'; import '../../../models/user.dart'; import '../../api_routes/urls.dart'; class HospitalsProvider extends ChangeNotifier { // number of items call in each request final pageItemNumber = 50; //reset provider data void reset() { _hospitals = null; _stateCode = null; } // state code of current request to defied error message // like 400 customer request failed // 500 service not available int? _stateCode; int? get stateCode => _stateCode; // true if there is next page in product list and false if not bool _nextPage = true; bool get nextPage => _nextPage; // contain user data // when user not login or register _user = null List? _hospitals; List? get hospitals => _hospitals; // when categories in-process _loading = true // done _loading = true // failed _loading = false bool? _loading; bool? get isLoading => _loading; set isLoading(bool? isLoading) { _loading = isLoading; notifyListeners(); } /// 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 getHospitals({ required String host, required User user, required String? title, }) async { if (_loading == true) { return -2; } _loading = true; notifyListeners(); Response response; try { response = await get( Uri.parse( "${host + URLs.getHospitals}?page=${(_hospitals?.length ?? 0) ~/ pageItemNumber}${title == null || title.isEmpty ? "" : "&name=$title"}", ), 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 categoriesListJson = json.decode(utf8.decode(response.bodyBytes)); List page = categoriesListJson.map((category) => Hospital.fromJson(category)).toList(); if (hospitals == null) _hospitals = []; _hospitals?.addAll(page); if (page.length >= pageItemNumber) { _nextPage = true; } else { _nextPage = false; } } _loading = false; notifyListeners(); return response.statusCode; } catch (error) { _loading = false; _stateCode = -1; notifyListeners(); return -1; } } Future> getHospitalsList({ required String host, required User user, required String title, }) async { Response response; try { response = await get( Uri.parse( host + URLs.getHospitals + (title.isEmpty ? "" : "?name=$title"), ), headers: {"Content-Type": "application/json; charset=utf-8"}, ); _stateCode = response.statusCode; List page = []; if (response.statusCode >= 200 && response.statusCode < 300) { // client's request was successfully received List categoriesListJson = json.decode(utf8.decode(response.bodyBytes)); page = categoriesListJson.map((category) => Hospital.fromJson(category)).toList(); } return page; } catch (error) { _loading = false; _stateCode = -1; notifyListeners(); return []; } } }