import 'dart:io';
import 'dart:async';

import 'package:flutter/material.dart';
import 'package:image/image.dart' as img;
import 'package:image_picker/image_picker.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  File _originalImage;
  File _compressedImage;
  Size _originalResolution;
  Size _compressedResolution;
  bool _isLoading = false;
  img.Image image;
  void _loadImage() async {
    setState(() {
      _isLoading = true;
    });
    //final file = await ImagePicker.pickImage(source: ImageSource.camera, maxWidth: 400.0 );
    final file = await ImagePicker.pickImage(source: ImageSource.camera);
    _originalImage = file;
    image = img.decodeJpg(await file.readAsBytes());
    _originalResolution = Size(image.width.toDouble(), image.height.toDouble());
    image = img.copyResize(image, 400);
    _compressedResolution =
        Size(image.width.toDouble(), image.height.toDouble());
        final r = 55;
    _compressedImage = File('${_originalImage.parent.path}/compressed$r.jpg');
    await _compressedImage.writeAsBytes(img.encodeJpg(image, quality: 60));
    // _compressedImage.open();
    image = null;

    setState(() {
      _isLoading = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: _isLoading
          ? Center(
              child: CircularProgressIndicator(),
            )
          : SingleChildScrollView(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  FittedBox(
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                      crossAxisAlignment: CrossAxisAlignment.center,
                      children: <Widget>[
                        _originalImage != null
                            ? Container(
                                width: MediaQuery.of(context).size.width / 2,
                                child: Image.file(
                                  _originalImage,
                                  fit: BoxFit.scaleDown,
                                ),
                              )
                            : Text("Load a new image to compress..."),
                        _compressedImage != null
                            ? Container(
                                width: MediaQuery.of(context).size.width / 2,
                                child: Image.file(
                                  _compressedImage,
                                  fit: BoxFit.scaleDown,
                                ),
                              )
                            : Text("Load a new image to compress..."),
                      ],
                    ),
                  ),
                  Text('Original Image Info:',
                      style: TextStyle(fontSize: 30.0)),
                  Text(
                      'Resolution: ${_originalResolution?.width?.toInt()}x${_originalResolution?.height?.toInt()}'),
                  Text('Path:${_originalImage?.path}'),
                  FutureBuilder<int>(
                    future: _originalImage?.length(),
                    builder: (context, snapshot) {
                      if (snapshot.hasData) {
                        final size =
                            (snapshot.data / 1024.0).toStringAsFixed(2);
                        return Text('Size: $size Kb');
                      }
                      return Text('Size: not available');
                    },
                  ),
                  Text('Compressed Image Info:',
                      style: TextStyle(fontSize: 30.0)),
                  Text(
                      'Resolution: ${_compressedResolution?.width?.toInt()}x${_compressedResolution?.height?.toInt()}'),
                  Text('Path:${_compressedImage?.path}'),
                  FutureBuilder<int>(
                    future: _compressedImage?.length(),
                    builder: (context, snapshot) {
                      if (snapshot.hasData) {
                        final size =
                            (snapshot.data / 1024.0).toStringAsFixed(2);
                        return Text('Size: $size Kb');
                      }
                      return Text('Size: not available');
                    },
                  ),
                ],
              ),
            ),
      floatingActionButton: FloatingActionButton(
        onPressed: _loadImage,
        tooltip: 'ImportImage',
        child: Icon(Icons.photo_camera),
      ),
    );
  }
}