import 'package:flutter/material.dart';
import 'package:image/image.dart' as imglib;
import 'dart:ui' as ui;
import 'package:flutter/services.dart';

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

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'IchooseApp',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

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

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

final Future<List<Image>> listImages =
    splitImage('assets/images/filmdirector.png');

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Image'),
      ),
      body: SingleChildScrollView(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const SizedBox(
              height: 16,
            ),
            FutureBuilder(
              future: listImages,
              builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
                print('Snapshot data: ' + snapshot.data);
                if (snapshot.hasData) {
                  return GridView.extent(
                      maxCrossAxisExtent: 150,
                      padding: const EdgeInsets.all(4),
                      mainAxisSpacing: 4,
                      crossAxisSpacing: 4,
                      children: List.generate(
                          snapshot.data!.length,
                          (i) => ListTile(
                                leading: snapshot.data?[i] ?? "got null",
                              )));
                } else {
                  return Text('Nothing to say');
                }
              },
            ),
          ],
        ),
      ),
      // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Future<List<ListTile>> _buildGridTileList(int count, listimg) async =>
    List.generate(
        count,
        (i) => ListTile(
              leading: listimg[i],
            ));

Future<List<Image>> splitImage(String path) async {
  imglib.Image? image = await decodeAsset(path);

  List<Image> pieces = [];
  int x = 0, y = 0;
  int width = (image!.width / 3).floor();
  int height = (image.height / 3).floor();
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      imglib.Image croppedImage =
          imglib.copyCrop(image, x: x, y: y, width: width, height: height);
      pieces.add(Image.memory(imglib.encodeJpg(croppedImage)));
      x += width;
    }
    x = 0;
    y += height;
  }

  return pieces;
}

Future<imglib.Image?> decodeAsset(String path) async {
  final data = await rootBundle.load(path);

  // Utilize flutter's built-in decoder to decode asset images as it will be
  // faster than the dart decoder.
  final buffer =
      await ui.ImmutableBuffer.fromUint8List(data.buffer.asUint8List());

  final id = await ui.ImageDescriptor.encoded(buffer);
  final codec =
      await id.instantiateCodec(targetHeight: id.height, targetWidth: id.width);

  final fi = await codec.getNextFrame();

  final uiImage = fi.image;
  final uiBytes = await uiImage.toByteData();

  final image = imglib.Image.fromBytes(
      width: id.width,
      height: id.height,
      bytes: uiBytes!.buffer,
      numChannels: 4);

  return image;
}


Future<imglib.Image?> decodeAsset(String path) async {
  final data = await rootBundle.load(path);

  // Utilize flutter's built-in decoder to decode asset images as it will be
  // faster than the dart decoder.
  final buffer =
      await ui.ImmutableBuffer.fromUint8List(data.buffer.asUint8List());

  final id = await ui.ImageDescriptor.encoded(buffer);
  final codec =
      await id.instantiateCodec(targetHeight: id.height, targetWidth: id.width);

  final fi = await codec.getNextFrame();

  final uiImage = fi.image;
  final uiBytes = await uiImage.toByteData();

  final image = imglib.Image.fromBytes(
      width: id.width,
      height: id.height,
      bytes: uiBytes!.buffer,
      numChannels: 4);

  return image;
}

Trying to build a grid view from Future<List> using Future Builder.
But i am getting this error.
error is as shown in image
Any help would be really appreciated.
I am actually trying to build an image swap game.

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