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

import 'dart:convert';

import 'package:test_sa/controllers/api_routes/urls.dart';
import 'package:test_sa/models/device/device.dart';
import 'package:test_sa/models/user.dart';
import 'package:flutter/cupertino.dart';
import 'package:http/http.dart';

class DevicesProvider extends ChangeNotifier{

  //reset provider data
  void reset(){
    _devices = 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;

  List<Device> _devices;
  List<Device> get devices => _devices;

  // 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<int> getEquipment ({
    @required String host,
    @required User user,
    @required String hospitalId
  }) async {
    if(_loading == true)
      return -2;
    _loading = true;
    notifyListeners();
    Response response;
    try{
      response = await get(
          Uri.parse(host + URLs.getEquipment+"?client=$hospitalId"),
        headers: {
            "Content-Type":"application/json; charset=utf-8"
        }
      );
    } catch(error) {
      _loading = false;
      _stateCode = -1;
      notifyListeners();
      return -1;
    }
    _stateCode = response.statusCode;
    if(response.statusCode >= 200 && response.statusCode < 300) {
      // client's request was successfully received
      List equipmentListJson = json.decode(utf8.decode(response.bodyBytes));
      _devices = equipmentListJson.map((device) => Device.fromJson(device)).toList();
    }
    _loading = false;
    notifyListeners();
    return response.statusCode;
  }

  /// 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<Device>> getDevicesList ({
    @required String host,
    @required User user,
    @required String hospitalId,
    @required String title}) async {
    Response response;
    try{
      response = await get(
          Uri.parse(host + URLs.getEquipment+"?client=$hospitalId"
              + ( title == null || title.isEmpty ? "" : "&name=$title" )),
      );
      _stateCode = response.statusCode;
      List<Device>  _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((device) => Device.fromJson(device)).toList();
      }
      return _page;
    } catch(error) {
      _loading = false;
      _stateCode = -1;
      notifyListeners();
      return [];
    }

  }

  /// 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<Device>> getDevicesListBySN ({
    @required String host,
    @required User user,
    @required String hospitalId,
    @required String sn
  }) async {
    Response response;
    try{
      response = await get(
        Uri.parse(host + URLs.getEquipment+"?client=$hospitalId"
            + ( sn == null || sn.isEmpty ? "" : "&serial_qr=$sn" )),
      );

      _stateCode = response.statusCode;
      List<Device>  _page = [];
      if(response.statusCode >= 200 && response.statusCode < 300) {
        // client's request was successfully received
        List categoriesListJson = json.decode(utf8.decode(response.bodyBytes));
        print(categoriesListJson.length);
        _page = categoriesListJson.map((device) => Device.fromJson(device)).toList();
        print(_page.length);
      }
      return _page;
    } catch(error) {
      print(error);
      _loading = false;
      _stateCode = -1;
      notifyListeners();
      return [];
    }

  }
}