import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:supabase_flutter/supabase_flutter.dart'; // <--- AGGIUNGI QUESTO

class ImageViewerWidget extends StatelessWidget {
  final String? storagePath; // ATTENZIONE: Ora contiene lo storagePath!
  final Uint8List? bytes;

  const ImageViewerWidget({super.key, this.storagePath, this.bytes})
    : assert(
        (storagePath != null && storagePath != '') || bytes != null,
        'Errore: Devi fornire un Path valido o i bytes del file!',
      );

  // Funzione che chiede le chiavi a Supabase
  Future<String> _getSignedUrl() async {
    return await Supabase.instance.client.storage
        .from('documents')
        .createSignedUrl(storagePath!, 60); // Link che si autodistrugge in 60s
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        leading: IconButton(
          icon: const Icon(Icons.close, color: Colors.black),
          onPressed: () => Navigator.pop(context),
        ),
      ),
      body: InteractiveViewer(
        maxScale: 5.0,
        child: Center(
          // Se abbiamo i byte, mostriamo subito. Altrimenti usiamo il FutureBuilder!
          child: bytes != null
              ? Image.memory(bytes!)
              : FutureBuilder<String>(
                  future: _getSignedUrl(),
                  builder: (context, snapshot) {
                    if (snapshot.connectionState == ConnectionState.waiting) {
                      return const CircularProgressIndicator();
                    }
                    if (snapshot.hasError) {
                      return const Text(
                        "Errore caricamento immagine (Permessi negati?)",
                        style: TextStyle(color: Colors.red),
                      );
                    }
                    if (snapshot.hasData) {
                      return Image.network(snapshot.data!);
                    }
                    return const SizedBox.shrink();
                  },
                ),
        ),
      ),
    );
  }
}