import 'package:flutter/material.dart';
import 'package:pdfx/pdfx.dart';
import 'package:internet_file/internet_file.dart'; // flutter pub add internet_file

class PdfViewerWidget extends StatefulWidget {
  final String url;

  const PdfViewerWidget({super.key, required this.url});

  @override
  State<PdfViewerWidget> createState() => _PdfViewerWidgetState();
}

class _PdfViewerWidgetState extends State<PdfViewerWidget> {
  late PdfControllerPinch _pdfController;
  bool _isLoading = true;

  @override
  void initState() {
    super.initState();
    _initPdf();
  }

  Future<void> _initPdf() async {
    // Scarica il file in memoria in modo fluido
    final pdfData = await InternetFile.get(widget.url);
    _pdfController = PdfControllerPinch(
      document: PdfDocument.openData(pdfData),
    );
    if (mounted) setState(() => _isLoading = false);
  }

  @override
  void dispose() {
    _pdfController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (_isLoading) {
      return const Center(child: CircularProgressIndicator());
    }
    return Scaffold(
      // Usiamo Scaffold dentro il Dialog per avere l'AppBar e poter chiudere
      appBar: AppBar(
        title: const Text("Visualizzatore PDF"),
        leading: IconButton(
          icon: const Icon(Icons.close),
          onPressed: () => Navigator.pop(context),
        ),
      ),
      body: PdfViewPinch(
        controller: _pdfController,
        // pdfx gestisce nativamente il pinch to zoom!
      ),
    );
  }
}