pdf_viewer_screen.dart

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import 'dart:convert';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';
 
import '../../../core/ui/theme/color_palette.dart';
import '../../../core/ui/widgets/custom_scaffold.dart';
import '../models/document_model.dart';
 
class PDFViewerScreen extends StatefulWidget {
  final DocumentModel document;
 
  const PDFViewerScreen({super.key, required this.document});
 
  @override
  State<PDFViewerScreen> createState() => _PDFViewerScreenState();
}
 
class _PDFViewerScreenState extends State<PDFViewerScreen> {
  String? _pdfPath;
  bool _isLoading = true;
  // Add error state
  String? _errorMessage;
 
  @override
  void initState() {
    super.initState();
    _loadPDF();
  }
 
  Future<void> _loadPDF() async {
    setState(() {
      _isLoading = true;
      _errorMessage = null;
    });
 
    try {
      if (widget.document.attachmentDocument.isNotEmpty) {
        final bytes = base64Decode(widget.document.attachmentDocument);
        final dir = await getTemporaryDirectory();
        final file = File('${dir.path}/${widget.document.pdfFileName}');
        await file.writeAsBytes(bytes);
        
        setState(() {
          _pdfPath = file.path;
          _isLoading = false;
        });
      } else {
        setState(() {
          _isLoading = false;
          _errorMessage = 'Document is empty';
        });
      }
    } catch (e) {
      setState(() {
        _isLoading = false;
        _errorMessage = 'Error loading PDF: $e';
      });
    }
  }
 
  @override
  Widget build(BuildContext context) {
    return CustomScaffold(
      title: widget.document.name,
      body: _isLoading
          ? const Center(
              child: CircularProgressIndicator(
                color: ColorPalette.lightGreen,
              ),
            )
          : _errorMessage != null
              ? Center(
                  child: Text(_errorMessage!),
                )
              : _pdfPath == null
                  ? const Center(
                      child: Text('Unable to load PDF'),
                    )
                  : _buildPdfViewer(),
    );
  }
 
  Widget _buildPdfViewer() {
    try {
      return SfPdfViewer.file(
        File(_pdfPath!),
        canShowScrollHead: true,
        canShowScrollStatus: true,
        enableDoubleTapZooming: true,
        onDocumentLoadFailed: (PdfDocumentLoadFailedDetails details) {
          setState(() {
            _errorMessage = 'Failed to load PDF: ${details.error}';
          });
        },
      );
    } catch (e) {
      return Center(
        child: Text('Error rendering PDF: $e'),
      );
    }
  }
}