import 'package:flutter/material.dart';
import 'dart:io';
import 'dart:async';
import 'package:rxdart/rxdart.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:flutter/services.dart';

void main() => runApp(MaterialApp(home: MyApp(),));

/*

1. Copy aria2c executable to ``/mnt/sdcard`` on your device.
2. Run Android Terminal Emulator.
3. ``mkdir /data/data/jackpal.androidterm/aria2``
4. ``cat /mnt/sdcard/aria2c > /data/data/jackpal.androidterm/aria2/aria2c``
5. ``chmod 744 /data/data/jackpal.androidterm/aria2/aria2c``
6. Add the following commands to the initial command of Android
   Terminal Emulator::

export HOME=/data/data/jackpal.androidterm/aria2; cd $HOME

7. Exit Android Terminal Emulator.
8. Run Android Terminal Emulator again.
9. See whether aria2c actually works by invoking ``./aria2c -v``
   */

class MyApp extends StatelessWidget {
DataBloc bloc;

checkPermission()async{
var per = await PermissionHandler().checkPermissionStatus(PermissionGroup.storage);
if(per!=PermissionStatus.granted){
await PermissionHandler().requestPermissions([PermissionGroup.storage]);
}
}

cp()async{
await checkPermission();
Directory tempDir = await getExternalStorageDirectory();
String workDir = join(tempDir.path, '');

var appLocation = await getApplicationDocumentsDirectory();

  await Process.run('chmod', \['755', appLocation.path+'/aria2'\]).then((e){  
    print(e.toString());  
    print(e.stdout);  
    print(e.stderr);  
    print(e.exitCode);  
    print('===============');  
  });

// var file1 = await rootBundle.load('assets/aria2c');
// var buf = file1.buffer;
// File(join(appLocation.path, 'aria2')).writeAsBytesSync(buf.asUint8List());

  await Process.run('${appLocation.path}'+'/aria2', \['-v'\]).then((e){  
    print(e.stdout);  
    print(e.stderr);  
    print(e.exitCode);  
  });  

}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('sss'),),
body: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
RaisedButton(child: Text('mkdir'),onPressed: (){
cp();
},),
RaisedButton(child: Text('delete'),onPressed: (){

        },),  
        Container(  
            width: 50,height: 50,child: Image(image: AssetImage('assets/img/a.png',),fit: BoxFit.cover,)),  
      \],  
    ),  
  ),  
);  

}
}

class DataBloc {
ReplaySubject dataBloc = ReplaySubject();
}