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

import 'dart:convert';

import 'package:test_sa/controllers/api_routes/urls.dart';
import 'package:test_sa/controllers/http_status_manger/http_status_manger.dart';
import 'package:test_sa/models/gas_refill/gas_refill_model.dart';
import 'package:test_sa/models/issue.dart';
import 'package:test_sa/models/service_report.dart';
import 'package:test_sa/models/service_request/service_request.dart';
import 'package:test_sa/models/service_request/service_request_search.dart';
import 'package:test_sa/models/subtitle.dart';
import 'package:test_sa/models/user.dart';
import 'package:flutter/cupertino.dart';
import 'package:http/http.dart';

class GasRefillProvider extends ChangeNotifier{

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

  //reset provider data
  void reset(){
    items = 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<GasRefillModel> items;

  // 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> getRequests ({
    @required String host,
    @required User user,
  }) async {
    if(isLoading == true)
      return -2;
    isLoading = true;
    Response response;
    try{
      print(  Uri.parse(
          "$host${URLs.getGasRefill}?uid=${user.id}"
          "&token=${user.token}&page=${(items?.length ?? 0) ~/pageItemNumber}"
      ));
      response = await get(
          Uri.parse(
              "$host${URLs.getGasRefill}?uid=${user.id}"
              "&token=${user.token}&page=${(items?.length ?? 0) ~/pageItemNumber}"
          ),
        headers: {
            "Content-Type":"application/json; charset=utf-8"
        }
      );
      print(response.body);
      stateCode = response.statusCode;
      if(stateCode >= 200 && stateCode < 300) {
        // client's request was successfully received
        List requestsListJson = json.decode(utf8.decode(response.bodyBytes));
        List<GasRefillModel> itemsPage = requestsListJson.map(
                (request) => GasRefillModel.fromJson(request)).toList();
        items ??= [];
        items.addAll(itemsPage);
        if(itemsPage.length == pageItemNumber){
          nextPage = true;
        }else{
          nextPage = false;
        }
      }
      isLoading = false;
      notifyListeners();
      return response.statusCode;

    } catch(error) {
      print(error);
      isLoading = false;
      stateCode = -1;
      notifyListeners();
      return -1;
    }

  }

  Future<int> createModel ({
    @required String host,
    @required User user,
    @required GasRefillModel model,
  }) async {
    Map<String,dynamic> body = {
      "uid": user.id.toString(),
      "token": user.token ?? "",
      "title": model.title ?? "",
      "status": "0",//model.status.value.toString(),
    };

    body["details"] = jsonEncode(model.details.map((model) => {
      "type": model.type.id.toString(),
      "size": model.cylinderSize.id.toString(),
      "requsted_qty": model.requestedQuantity.toString(),
    }).toList());

    print(body);
    Response response;
    try{
      response = await post(
          Uri.parse(
          host+URLs.requestGasRefill),
          body: body,
      );

      print(response.body);
      stateCode = response.statusCode;
      if(response.statusCode >= 200 && response.statusCode < 300) {
        if(items != null) {
          items.insert(
              0,
              GasRefillModel.fromJson(
                  json.decode(utf8.decode(response.bodyBytes))[0]
              )
          );
          notifyListeners();
        }
      }
      return response.statusCode;

    } catch(error) {
      print(error);
      return -1;
    }

  }

  Future<int> updateModel ({
    @required String host,
    @required User user,
    @required GasRefillModel oldModel,
    @required GasRefillModel newModel,
  }) async {
    Map<String,dynamic> body = {
      "uid": user.id.toString(),
      "token": user.token ?? "",
      "title": newModel.title ?? "",
      "status": newModel.status.id.toString(),
    };

    body["details"] = jsonEncode(newModel.details.map((model) => {
      "type": model.type.id.toString(),
      "size": model.cylinderSize.id.toString(),
      "requsted_qty": model.requestedQuantity.toString(),
      "deliverd_qty": model.deliveredQuantity.toString(),
    }).toList());

    print(body);
    print(Uri.parse("$host${URLs.updateGasRefill}/${newModel.id}"),);
    Response response;
    try{
      response = await post(
        Uri.parse("$host${URLs.updateGasRefill}/${newModel.id}"),
        body: body,
      );

      print(response.body);
      stateCode = response.statusCode;
      if(response.statusCode >= 200 && response.statusCode < 300) {
        oldModel.fromGasRefillModel(newModel);
        notifyListeners();
      }
      return response.statusCode;

    } catch(error) {
      print(error);
      return -1;
    }

  }
}