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

import 'dart:convert';

import 'package:flutter/cupertino.dart';
import 'package:http/http.dart';
import 'package:test_sa/controllers/api_routes/api_manager.dart';
import 'package:test_sa/controllers/api_routes/urls.dart';
import 'package:test_sa/models/user.dart';
import 'package:test_sa/models/visits/visit.dart';
import 'package:test_sa/models/visits/visits_group.dart';
import 'package:test_sa/models/visits/visits_search.dart';

class PreventiveMaintenanceVisitsProvider extends ChangeNotifier{

  // number of items call in each request
  final pageItemNumber = 50;

  //reset provider data
  void reset(){
    visits = 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<Visit> visits;

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

  VisitsSearch visitsSearch = VisitsSearch();

  /// 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> getVisits ({
    @required String host,
    @required User user,
   // VisitsSearch visitsSearch,
  }) async {
    if(isLoading == true)
      return -2;
    isLoading = true;
    Response response;
    //userId = 397.toString(); // testing id to view data
    try{
      response = await get(
          Uri.parse(
        host + URLs.getPreventiveMaintenanceVisits
          +"?uid=${user.id}"
          "&token=${user.token}"
          "&page=${(visits?.length ?? 0) ~/pageItemNumber}"
         // +visitsSearch?.toMap() ?? ""
          ),
        headers: {
            "Content-Type":"application/json; charset=utf-8"
        }
      );
    } catch(error) {
      isLoading = false;
      stateCode = -1;
      notifyListeners();
      return -1;
    }
    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<Visit> _visits = requestsListJson.map(
              (request) => Visit.fromJson(request)).toList();
      if(visits == null)
        visits = [];
      visits.addAll(_visits);
      if(_visits.length == pageItemNumber){
        nextPage = true;
      }else{
        nextPage = false;
      }
    }
    isLoading = 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<int> updateGroupOfVisits ({
    @required String host,
    @required User user,
    VisitsGroup group,
  }) async {
    Response response;
    Map<String,String> body = group.toJson();
    // body["token"] = user.token ?? "";
    // body["uid"] = user.id;
    //userId = 397.toString(); // testing id to view data
    try{
      response = await ApiManager.instance.put(
          URLs.updatePreventiveMaintenanceVisits, body: body);

      stateCode = response.statusCode;
      if(response.statusCode >= 200 && response.statusCode < 300) {
        // client's request was successfully received
        // group.visits.forEach((visit) {
        //   visit.status = group.status;
        //   visit.actualDate = group.date.toString().split(" ").first;
        // });
        group.visits.clear();
        notifyListeners();
      }

      return response.statusCode;
    } catch(error) {
      isLoading = false;
      stateCode = -1;
      notifyListeners();
      return -1;
    }
  }
}