Asset-App/lib/util/download_Upload_Handler.dart

import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';
import 'package:assetstock/util/prefsKey.dart';
import 'package:flutter/cupertino.dart';
import 'package:path_provider/path_provider.dart';
import 'package:http/http.dart';
import 'package:path/path.dart';
import 'package:async/async.dart';
import 'dart:io';
import 'utils.dart';

class file_Trans_Handler {
//  double _progress = 0;
  Util util = new Util();
  String _path = '';
  StreamSubscription dlulStream;
  String _error = '';
  String _success = '';
  bool _finish = false;
  get isFinish => _finish;
  get path => _path;
  get error => _error;
  get success => _success;
  StreamController _progress = new StreamController<double>();
  Stream<double> get progress =>_progress.stream;
  var client = new Client();
  var headers = {'device':'mobile'};
  downloadFile(String fileName,String link) async {
    StreamedResponse _response;
    List<int> _bytes = [];
    int _total = 0;
    print('Start Download');
    _progress.add(null);
    try {
      Request req = new Request('GET', Uri.parse(link));
      req.headers.addAll(headers);
      _response = await client.send(req).timeout(
          Duration(seconds: 20));
//      _response = await client.get('$link',headers: 'application/json')
      _total = _response.contentLength;
      print('${_total / 1024} KB');
      dlulStream = _response.stream.listen((value) {
        _bytes.addAll(value);
        _progress.add(((_bytes.length / _total)));
      })
        ..onDone(() async {
          _progress.add(0.0);
          print('Finish Download');
          final file = File(
              "${(await getApplicationDocumentsDirectory()).path}/$fileName");
          await file.writeAsBytes(_bytes);
          _path = file.path;
        })
        ..onError((e) async {
          print('Error Download, $e');
          _progress.add(-1.0);
          _error = e.toString();
        });
    }
    catch(e){
      print('Error Download, $e');
      _progress.add(-1.0);
      _error = e.toString();
    }
  }

  uploadFile(String fileName,String link,String user,context) async{
    StreamedResponse _response;
    int _total;
    List<int> _bytes = [];
    _finish = false;
    final file = File(
        "${(await getApplicationDocumentsDirectory()).path}/$fileName");
      _total = file.lengthSync();
      print(_total/1024);
      try{
        var request = MultipartRequest('POST', Uri.parse(link));
        request.headers.addAll(headers);
        request.files.add(await MultipartFile.fromPath('sqliteDb', file.path));
        request.fields[keyClass.user] = user;

        // _response = await client.send(request).timeout(Duration(seconds: 8));
        print(["sadasdasda",await util.checkinternet()]);
        if(await util.checkinternet()){
          util.showLoading(context,dissmissable: false,onwillpop: ()async{return false;});
          _response = await client.send(request);
          print("MASIH JALAN");
          if(_response.statusCode==200){
            _error = '';_success = '';
            dlulStream = _response.stream.listen((value) {
              _bytes.addAll(value);
              _progress.add((_bytes.length / _total));
              try{
                var result = jsonDecode(utf8.decode(value));
                if(result['STATUS']==0) {
                  _error = result['DATA'];
                  _finish = true;
                }
                else if(result['STATUS']==1){
                  _error = '';
                  _success = result['DATA'];
                  _finish = true;
                }
              }catch(e){
              }
            })
              ..onDone(()async {
                Navigator.pop(context);
                client?.close();
                _finish = true;

                print("sdasdasdsd $_error");
                if(_error!=''){
                  _progress.add(-1.0);
                  print('Error Upload, $_error');
                }
                else{
                  _progress.add(1.0);
                  print('Finish Upload');
                  print('done');
                }
              })
              ..onError((e){
                Navigator.pop(context);
                client?.close();
                print('Error Upload, $e');
                _progress.add(-1.0);
                _error = e.toString();
              });
          }
          else{
            Navigator.pop(context);
            client?.close();
            var resBody = await _response.stream.bytesToString();
            _progress.add(-1.0);
            _finish = true;
            _error = resBody;
          }
        }
        else{
          client?.close();
          _progress.add(-1.0);
          _finish = true;
          _error = "Check Internet Connection";
        }
      }
      // on TimeoutException{
      //   client?.close();
      //   print(['error timed out']);
      //   Navigator.pop(context);
      //   _progress.add(-1.0);
      //   _finish = true;
      //   _error = "Request timed out. Please check connection";
      // }
      catch(e){
        client?.close();
        print(['error',e]);
        _finish = true;
        _progress.add(-1.0);
        _error = e.toString();
      }
  }
  cancel()async{
    client?.close();
    await dlulStream?.cancel();
    _progress?.close();
  }
}