import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flux/core/utils/functions.dart';
import 'package:pdfx/pdfx.dart';
import 'package:internet_file/internet_file.dart';

class PdfViewerWidget extends StatefulWidget {
  final String? storagePath;
  final Uint8List? bytes;

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

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

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

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

  Future<void> _initPdf() async {
    try {
      Uint8List pdfData;

      if (widget.bytes != null) {
        // SCENARIO 1: Pratica in bozza, file appena scelto (Locale)
        pdfData = widget.bytes!;
      } else if (widget.storagePath != null && widget.storagePath!.isNotEmpty) {
        // SCENARIO 2: Pratica salvata, scarichiamo da Supabase (Remoto)
        final signedUrl = await getSignedUrl(widget.storagePath!);
        pdfData = await InternetFile.get(signedUrl);
      } else {
        throw Exception("Nessun documento trovato");
      }

      _pdfController = PdfControllerPinch(
        document: PdfDocument.openData(pdfData),
      );

      if (mounted) setState(() => _isLoading = false);
    } catch (e) {
      if (mounted) {
        setState(() {
          _isLoading = false;
          _errorMessage = e.toString();
        });
      }
    }
  }

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

  @override
  Widget build(BuildContext context) {
    if (_isLoading) {
      return const Scaffold(body: Center(child: CircularProgressIndicator()));
    }

    if (_errorMessage != null) {
      return Scaffold(
        appBar: AppBar(leading: const CloseButton()),
        body: Center(child: Text("Errore: $_errorMessage")),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text("Anteprima PDF"),
        leading: IconButton(
          icon: const Icon(Icons.close),
          onPressed: () => Navigator.pop(context),
        ),
      ),
      body: PdfViewPinch(controller: _pdfController),
    );
  }
}