file_storage.dart

//dialogs
//date time(datetime picker)
//file storage
//Drectory
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';

void main() async {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Home(),
    );
  }
}

class Home extends StatefulWidget {
  const Home({super.key});

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  //folder //file
  final TextEditingController _dataController = TextEditingController();
  final TextEditingController _fileNameController = TextEditingController();

  @override
  void initState() {
    super.initState();
    _loadDirectory("path_provider.txt");
  }

  void _loadDirectory(String fileName) async {
    Directory directory = await _getDirectory();
    String filePath = "${directory.path}/$fileName";
    _readData(filePath);
  }

  void _readData(String filePath) async {
    File file = File(filePath);
    String data = await file.readAsString();
    setState(() {
      _dataController.text = data;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          TextField(
            controller: _dataController,
            decoration: InputDecoration(hintText: 'File data'),
            minLines: 3,
            maxLines: 10,
          ),
          TextField(
            controller: _fileNameController,
            decoration: InputDecoration(hintText: 'File Name'),
          ),
          ElevatedButton(
            onPressed: () async {
              // ////filename.png
              Directory appDirectory = await _getDirectory();
              String filePath =
                  "${appDirectory.path}/${_fileNameController.text}";
              File file = File(filePath);
              await file.writeAsString(_dataController.text);
              setState(() {});
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(
                  content: Text('Success'),
                ),
              );
            },
            child: Text("Save"),
          ),
          FutureBuilder(
            key: UniqueKey(),
            future: _getDirectory(),
            builder: (context, snapshot) {
              if (snapshot.hasData) {
                Directory appFlutter = snapshot.data!;
                List<FileSystemEntity> entities = appFlutter.listSync();
                return Column(
                  children: [
                    for (FileSystemEntity entity in entities)
                      _fileOrFolder(entity)
                  ],
                );
              }
              return SizedBox.shrink();
            },
          ),
        ],
      ),
    );
  }

  Widget _fileOrFolder(FileSystemEntity entity) {
    final entityName = entity.path.split("/").last;
    if (entity is Directory) {
      return ListTile(
        leading: Icon(Icons.folder),
        title: Text(entityName),
      );
    } else if (entity is File) {
      return ListTile(
        onTap: () {
          _loadDirectory(entityName);
        },
        onLongPress: () async {
          bool? isConfirmDelete = await showDialog(
            context: context,
            builder: (context) {
              return AlertDialog(
                title: Text("Delete"),
                content: Text('Are you sure to delete $entityName?'),
                actions: [
                  OutlinedButton(
                    onPressed: () {
                      Navigator.pop(context);
                    },
                    child: Text("No"),
                  ),
                  FilledButton(
                    onPressed: () {
                      Navigator.pop(context, true);
                    },
                    child: Text("Yes"),
                  )
                ],
              );
            },
          );
          if (isConfirmDelete == true) {
            File file = File(entity.path);
            if (await file.exists()) {
              await file.delete();
              setState(() {});
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(
                  content: Text('Delete success'),
                ),
              );
            }
          }
        },
        leading: Icon(Icons.picture_as_pdf_outlined),
        title: Text(
          (entityName),
        ),
        subtitle: Text((entity.statSync().size).toString()),
        trailing: Text(
            "${entity.statSync().changed.day}/${entity.statSync().changed.month}/${entity.statSync().changed.year} ${entity.statSync().changed.hour}:${entity.statSync().changed.minute}:${entity.statSync().changed.second}"),
      );
    }
    return SizedBox.shrink();
  }

  Future<Directory> _getDirectory() {
    // return getApplicationDocumentsDirectory();
    return getTemporaryDirectory();
  }
}