dependencies:
  firebase_core: ^2.27.0
  firebase_storage: ^11.6.0
  image_picker: ^1.1.0

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:firebase_storage/firebase_storage.dart';

class UploadImagePage extends StatefulWidget {
  @override
  _UploadImagePageState createState() => _UploadImagePageState();
}

class _UploadImagePageState extends State<UploadImagePage> {
  File? _image;
  String? _uploadedURL;

  Future<void> pickAndUpload() async {
    final picker = ImagePicker();
    final picked = await picker.pickImage(source: ImageSource.gallery);

    if (picked != null) {
      setState(() => _image = File(picked.path));

      final ref = FirebaseStorage.instance.ref().child("images/\${DateTime.now().millisecondsSinceEpoch}.jpg");
      await ref.putFile(_image!);

      final url = await ref.getDownloadURL();
      setState(() => _uploadedURL = url);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('อัปโหลดรูปภาพ')),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          _image != null ? Image.file(_image!, height: 150) : Placeholder(fallbackHeight: 150),
          SizedBox(height: 20),
          ElevatedButton(onPressed: pickAndUpload, child: Text('เลือกรูปและอัปโหลด')),
          if (_uploadedURL != null)
            Text('URL: \$_uploadedURL', style: TextStyle(fontSize: 12)),
        ],
      ),
    );
  }
}