import 'dart:io';
import 'package:flutter/material.dart';
import 'package:pdfrx/pdfrx.dart';
import 'package:stadtbote/content_views/utils/content_view_widget.dart';
import 'package:stadtbote/tools/pdf_service.dart';
import 'package:stadtbote/tools/util.dart';

class PdfViewerPage extends ContentViewWidget {
  final String pdfUrl;
  final String title;

  const PdfViewerPage({
    super.key,
    required this.pdfUrl,
    this.title = 'PDF',
  });

  @override
  State<PdfViewerPage> createState() => _PdfViewerPageState();

  @override
  Future<Widget> getHeaderWidget(BuildContext context) async {
    await Future.delayed(const Duration(microseconds: 0));
    return Text(
      title,
      style: const TextStyle(
        fontSize: 18,
        fontWeight: FontWeight.bold,
      ),
    );
  }
}

class _PdfViewerPageState extends State<PdfViewerPage> {
  final PdfService _pdfService = PdfService();
  File? _pdfFile;
  bool _isLoading = true;
  String? _errorMessage;

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

  Future<void> _loadPdf() async {
    if (!_pdfService.isValidPdfUrl(widget.pdfUrl)) {
      setState(() {
        _isLoading = false;
        _errorMessage = 'Ungültige PDF-URL';
      });
      return;
    }

    try {
      final file = await _pdfService.getPdf(widget.pdfUrl);
      setState(() {
        _pdfFile = file;
        _isLoading = false;
      });
    } catch (e) {
      Util.logException('Error loading PDF: $e');
      setState(() {
        _isLoading = false;
        _errorMessage = 'Fehler beim Laden der PDF: $e';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    if (_isLoading) {
      return const Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            CircularProgressIndicator(),
            SizedBox(height: 16),
            Text('PDF wird geladen...'),
          ],
        ),
      );
    }

    if (_errorMessage != null) {
      return Center(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Icon(
                Icons.error_outline,
                size: 64,
                color: Colors.red,
              ),
              const SizedBox(height: 16),
              Text(
                _errorMessage!,
                textAlign: TextAlign.center,
                style: const TextStyle(color: Colors.red),
              ),
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: () {
                  setState(() {
                    _isLoading = true;
                    _errorMessage = null;
                  });
                  _loadPdf();
                },
                child: const Text('Erneut versuchen'),
              ),
            ],
          ),
        ),
      );
    }

    if (_pdfFile == null) {
      return const Center(
        child: Text('Keine PDF-Datei verfügbar'),
      );
    }

    return PdfViewer.file(
      _pdfFile!.path,
    );
  }
}