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

import 'dart:convert';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.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/service_request/spare_parts.dart';

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

  //reset provider data
  void reset() {
    _parts = 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<SparePartsWorkOrders> _parts;

  List<SparePartsWorkOrders> get parts => _parts;

  // 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> getParts({String title}) async {
    if (_loading == true) return -2;
    _loading = true;
    notifyListeners();
    Response response;
    try {
      response = await ApiManager.instance.post(URLs.getPartNumber, body: {if (title != null && title.isNotEmpty) "partName": title});
      _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<SparePart> _page = categoriesListJson.map((part) => SparePart.fromJson(part)).toList();
        _parts ??= [];
        _parts.addAll(_page.map((e) => SparePartsWorkOrders(sparePart: e)).toList());
        if (_page.length >= pageItemNumber) {
          _nextPage = true;
        } else {
          _nextPage = false;
        }
      }
      _loading = false;
      notifyListeners();
      return response.statusCode;
    } catch (error) {
      _loading = 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<SparePart>> getPartsList({num assetId, String title}) async {
    Response response;
    try {
      if (int.tryParse(title ?? "") != null) {
        response = await ApiManager.instance.post(URLs.getPartNumber, body: {if (title != null && title.isNotEmpty) "partNo": title, "assetId": assetId});
      } else {
        response = await ApiManager.instance.post(URLs.getPartNumber, body: {if (title != null && title.isNotEmpty) "partName": title, "assetId": assetId});
      }
      List<SparePart> page = [];
      if (response.statusCode >= 200 && response.statusCode < 300) {
        // client's request was successfully received
        List categoriesListJson = json.decode(response.body)["data"];
        page = categoriesListJson.map((part) => SparePart.fromJson(part)).toList();
      }
      return page;
    } catch (error) {
      return [];
    }
  }
}