didvan-app/lib/views/pdf_viewer/pdf_viewer_page.dart

import 'package:didvan/views/widgets/didvan/text.dart';
import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';
import 'package:flutter/foundation.dart';
import 'package:didvan/services/network/request.dart';
import 'package:universal_html/html.dart' as html;

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

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

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

class _PdfViewerPageState extends State<PdfViewerPage> {
  final PdfViewerController _pdfViewerController = PdfViewerController();
  bool _isLoading = true;
  String? _errorMessage;
  late String _fullPdfUrl;

  @override
  void initState() {
    super.initState();
    _fullPdfUrl = widget.pdfUrl.contains('?')
        ? 'https://api.didvan.app${widget.pdfUrl}'
        : 'https://api.didvan.app${widget.pdfUrl}';

    if (kDebugMode) {
      print('Original PDF URL: ${widget.pdfUrl}');
      print('Full PDF URL : $_fullPdfUrl');
    }

    // برای وب، PDF را مستقیماً در مرورگر باز می‌کند
    if (kIsWeb) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        _openPdfInBrowser();
      });
    }
  }

  void _openPdfInBrowser() {
    final token = RequestService.token;
    final pdfUrlWithAuth =
        '$_fullPdfUrl${_fullPdfUrl.contains('?') ? '&' : '?'}token=$token';

    // روش سازگار با تمام مرورگرها شامل Safari
    try {
      final anchor = html.AnchorElement(href: pdfUrlWithAuth)
        ..setAttribute('target', '_blank')
        ..setAttribute('rel', 'noopener');
      html.document.body?.append(anchor);
      anchor.click();
      anchor.remove();

      if (kDebugMode) {
        print('PDF opened successfully in new tab');
      }
    } catch (e) {
      if (kDebugMode) {
        print('Error opening PDF: $e');
      }
    }

    Future.delayed(const Duration(milliseconds: 500), () {
      if (mounted) {
        Navigator.of(context).pop();
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    // برای وب، صفحه‌ای نشان می‌دهد که PDF در تب جدیدی باز می‌شود
    if (kIsWeb) {
      return Scaffold(
        resizeToAvoidBottomInset: true,
        appBar: AppBar(
          title: DidvanText(
            widget.title,
            style: const TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.bold,
            ),
          ),
          centerTitle: true,
          elevation: 0,
          backgroundColor: Theme.of(context).colorScheme.surface,
        ),
        body: const Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              CircularProgressIndicator(),
              SizedBox(height: 16),
              DidvanText(
                'درحال باز کردن PDF در مرورگر...',
                style: TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ],
          ),
        ),
      );
    }

    // برای پلتفرم‌های دیگر، از SfPdfViewer استفاده کن
    return Scaffold(
      resizeToAvoidBottomInset: true,
      appBar: AppBar(
        title: DidvanText(
          widget.title,
          style: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.bold,
          ),
        ),
        centerTitle: true,
        elevation: 0,
        backgroundColor: Theme.of(context).colorScheme.surface,
      ),
      body: Stack(
        children: [
          SfPdfViewer.network(
            _fullPdfUrl,
            controller: _pdfViewerController,
            enableDoubleTapZooming: true,
            enableTextSelection: true,
            canShowScrollHead: true,
            canShowScrollStatus: true,
            pageLayoutMode: PdfPageLayoutMode.continuous,
            headers: {
              'Authorization': 'Bearer ${RequestService.token}',
            },
            onDocumentLoaded: (PdfDocumentLoadedDetails details) {
              setState(() {
                _isLoading = false;
              });
              if (kDebugMode) {
                print(
                    'PDF loaded successfully with ${details.document.pages.count} pages');
              }
            },
            onDocumentLoadFailed: (PdfDocumentLoadFailedDetails details) {
              setState(() {
                _isLoading = false;
                _errorMessage = details.error;
              });
              if (kDebugMode) {
                print('PDF load failed: ${details.error}');
                print('Description: ${details.description}');
              }
            },
          ),
          if (_isLoading)
            const Center(
              child: CircularProgressIndicator(),
            ),
          if (_errorMessage != null)
            Center(
              child: Padding(
                padding: const EdgeInsets.all(20.0),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    const Icon(
                      Icons.error_outline,
                      size: 64,
                      color: Colors.red,
                    ),
                    const SizedBox(height: 16),
                    const DidvanText(
                      'خطا در بارگذاری PDF',
                      style: TextStyle(
                        fontSize: 18,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    const SizedBox(height: 8),
                    DidvanText(
                      _errorMessage!,
                      textAlign: TextAlign.center,
                      style: const TextStyle(fontSize: 14),
                    ),
                    const SizedBox(height: 16),
                    ElevatedButton(
                      onPressed: () {
                        setState(() {
                          _isLoading = true;
                          _errorMessage = null;
                        });
                      },
                      child: const DidvanText('تلاش مجدد'),
                    ),
                  ],
                ),
              ),
            ),
        ],
      ),
    );
  }

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