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

import 'dart:convert';

import 'package:flutter/cupertino.dart';
import 'package:http/http.dart';

import '../../../models/device/device_transfer.dart';
import '../../../models/device/device_transfer_info.dart';
import '../../../models/user.dart';
import '../../api_routes/urls.dart';

class DeviceTransferProvider 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<DeviceTransfer>? 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;

    // isLoading = false;
    // stateCode = 200;
    // items = [];
    // items.addAll(List.generate(20, (index) => DeviceTransfer(
    //   title: "ddddd",
    //   id: "5",
    //   device: Device(id: "1",brand: "brand",model: "model"),
    //   destinationClient: Hospital(name: "hospital name",id: "1"),
    //   destinationDepartment: Department(id: "5",name: "destination Department"),
    //   senderDepartment: Department(id: "5",name: "sender Department"),
    //   userId: "5"
    // )));
    // notifyListeners();
    // return 200;
    Response response;
    try {
      response = await get(
          Uri.parse("$host${URLs.getDeviceTransfer}?uid=${user.id}"
              "&token=${user.token}&page=${(items?.length ?? 0) ~/ pageItemNumber}"),
          headers: {"Content-Type": "application/json; charset=utf-8"});
      stateCode = response.statusCode;
      if (stateCode != null && stateCode! >= 200 && stateCode! < 300) {
        // client's request was successfully received
        List listJson =
            json.decode(utf8.decode(response.bodyBytes).replaceAll("\\", ""));
        List<DeviceTransfer> itemsPage = listJson
            .map((request) => DeviceTransfer.fromJson(request))
            .toList();
        items ??= [];
        items?.addAll(itemsPage);
        if (itemsPage.length == pageItemNumber) {
          nextPage = true;
        } else {
          nextPage = false;
        }
      }
      isLoading = false;
      notifyListeners();
      return response.statusCode;
    } catch (error) {
      isLoading = false;
      stateCode = -1;
      notifyListeners();
      return -1;
    }
  }

  Future<int> createRequest({
    required String host,
    required User? user,
    required DeviceTransfer model,
  }) async {
    Map<String, dynamic> body = {
      "uid": user?.id.toString(),
      "token": user?.token ?? "",
      "serial_id": model.device?.id ?? "",
      "destination_client": model.receiver?.client?.id ?? "",
      "destination_department": model.receiver?.department?.id ?? "",
    };

    Response response;
    try {
      response = await post(
        Uri.parse(host + URLs.requestDeviceTransfer),
        body: body,
      );
      stateCode = response.statusCode;
      if (response.statusCode >= 200 && response.statusCode < 300) {
        final items = this.items;
        if (items != null) {
          items.insert(
              0,
              DeviceTransfer.fromJson(
                  json.decode(utf8.decode(response.bodyBytes))[0]));
          notifyListeners();
        }
      }
      return response.statusCode;
    } catch (error) {
      return -1;
    }
  }

  Future<int> updateRequest({
    required String host,
    required User user,
    required bool isSender,
    required String requestId,
    required DeviceTransfer? oldModel,
    required DeviceTransferInfo newModel,
  }) async {
    Map<String, dynamic> body = {
      "uid": user.id.toString(),
      "token": user.token ?? "",
      "current_user": user.id ?? "",
    };

    body.addAll(newModel.toJson(isSender));
    Response response;
    try {
      response = await post(
        Uri.parse("$host${URLs.updateDeviceTransfer}/$requestId"),
        body: body,
      );
      stateCode = response.statusCode;
      if (response.statusCode >= 200 && response.statusCode < 300) {
        reset();
        // oldModel.fromDeviceTransfer(
        //   DeviceTransfer.fromJson(
        //       json.decode(utf8.decode(response.bodyBytes))[0]
        //   )
        // );
        notifyListeners();
      }
      return response.statusCode;
    } catch (error) {
      return -1;
    }
  }
}