flutter-freaccess-hub/lib/shared/widgets/read_view.dart

import 'dart:developer';
import 'dart:io';
import 'package:flutter/material.dart';
// Removed unnecessary import
import 'package:hub/flutter_flow/index.dart';
import 'package:hub/shared/utils/dialog_util.dart';
import 'package:hub/shared/widgets.dart';
import 'package:path_provider/path_provider.dart';
import 'package:pdfx/pdfx.dart';
import 'package:share_plus/share_plus.dart';
import 'package:http/http.dart' as http;

typedef ReadViewController = PdfController;
typedef DocumentType = PdfDocument;

abstract interface class Viewer extends StatelessComponent {
  final String src;

  const Viewer({
    super.key,
    required this.src,
  });

  @override
  Widget build(BuildContext context) {
    return buildViewer(context);
  }

  Widget buildViewer(BuildContext context);
}

class ReadView extends StatefulWidget {
  final String url;
  final String title;
  final VoidCallback onError;

  const ReadView({
    super.key,
    required this.onError,
    required this.url,
    required this.title,
  });

  @override
  State<ReadView> createState() => ReadViewState();
}

class ReadViewState extends State<ReadView> {
  Future<ReadViewController> _initializePdf() async {
    try {
      final file = await downloadPdf(widget.url);
      final Future<DocumentType> document = DocumentType.openFile(file.path);
      return ReadViewController(document: document);
    } catch (e) {
      final message = FFLocalizations.of(context).getVariableText(
        ptText: 'Erro ao baixar o PDF',
        enText: 'Error downloading PDF',
      );

      return Future.error(message);
    }
  }

  Future<File> downloadPdf(String url) async {
    try {
      final response = await http.get(Uri.parse(url));
      if (response.statusCode == 200) {
        final bytes = response.bodyBytes;
        final dir = await getTemporaryDirectory();
        final file = File('${dir.path}/downloaded.pdf');
        await file.writeAsBytes(bytes);
        return file;
      } else {
        throw Exception('Falha ao baixar o PDF');
      }
    } catch (e) {
      final message = FFLocalizations.of(context).getVariableText(
        ptText: 'Erro ao baixar o PDF',
        enText: 'Error downloading PDF',
      );
      await throwError(message, e);
      rethrow;
    }
  }

  Future<void> throwError(String message, dynamic error) async {
    log('$message: $error');
    await DialogUtil.error(context, message)
        .whenComplete(() => widget.onError());
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        _buildPDFViewer(context),
        buildShareButton(context),
      ],
    );
  }

  Positioned buildShareButton(BuildContext context) {
    final theme = FlutterFlowTheme.of(context);
    return Positioned(
      bottom: 10,
      right: 10,
      child: IconButton(
        icon: Icon(
          Icons.share,
          color: theme.primaryText,
        ),
        color: theme.primaryText,
        onPressed: onShare,
      ),
    );
  }

  Future<void> onShare() async {
    try {
      final Uri uri = Uri.parse(widget.url);
      final response = await http.get(uri);
      if (response.statusCode == 200) {
        final XFile xfile = XFile.fromData(response.bodyBytes,
            name: '${widget.title}.pdf', mimeType: 'application/pdf');
        await Share.shareXFiles([xfile],
            text: 'Confira este PDF!',
            fileNameOverrides: ['${widget.title}.pdf']);
      } else {
        throw Exception(
            'Erro ao compartilhar o arquivo: ${response.statusCode}');
      }
    } catch (e) {
      final message = FFLocalizations.of(context).getVariableText(
        ptText: 'Erro ao compartilhar o arquivo',
        enText: 'Error sharing file',
      );
      await throwError(message, e);
    }
  }

  Widget buildLoadingIndicator(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(vertical: 15),
      child: Center(
        child: CircularProgressIndicator(
          valueColor: AlwaysStoppedAnimation<Color>(
            FlutterFlowTheme.of(context).primary,
          ),
        ),
      ),
    );
  }

  Widget _buildPDFViewer(BuildContext context) => Padding(
        padding: EdgeInsets.all(10),
        child: FutureBuilder<ReadViewController>(
            future: _initializePdf(),
            builder: (context, snapshot) {
              if (!snapshot.hasData) return buildLoadingIndicator(context);
              if (snapshot.error != null) {
                return buildLoadingIndicator(context);
              }
              if (snapshot.connectionState == ConnectionState.waiting) {
                return buildLoadingIndicator(context);
              }

              return PdfView(
                controller: snapshot.data!,
                renderer: (PdfPage page) => page.render(
                  width: page.width * 2,
                  height: page.height * 2,
                  cropRect: Rect.fromLTWH(
                      10.0, 10.0, page.width * 2, page.height * 2),
                  forPrint: false,
                  quality: 100,
                  format: PdfPageImageFormat.jpeg,
                  backgroundColor: '#ffffff',
                ),
                scrollDirection: Axis.vertical,
              );
            }),
      );
}