kulakpos_app/lib/Screens/barcode/barcode_preview.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:pdf/pdf.dart';
import 'package:printing/printing.dart';
import 'package:pdf/widgets.dart' as pw;
import 'dart:io';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:mobile_pos/generated/l10n.dart' as lang;
import 'package:path_provider/path_provider.dart';

import 'package:permission_handler/permission_handler.dart';

import '../../constant.dart';
import '../../http_client/custome_http_client.dart';
import '../../service/check_user_role_permission_provider.dart';

class PdfPreviewScreen extends ConsumerStatefulWidget {
  final pw.Document pdfDocument;

  const PdfPreviewScreen({super.key, required this.pdfDocument});

  @override
  ConsumerState<PdfPreviewScreen> createState() => _PdfPreviewScreenState();
}

class _PdfPreviewScreenState extends ConsumerState<PdfPreviewScreen> {
  Future<void> _saveBarcodeLabels(pw.Document doc) async {
    if (Platform.isIOS) {
      EasyLoading.show(status: lang.S.current.downloading);
      final dir = await getApplicationDocumentsDirectory();
      final file = File('${dir.path}/barcode_labels.pdf');
      final byteData = await doc.save();
      try {
        await file.writeAsBytes(byteData.buffer.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));
        EasyLoading.showSuccess(lang.S.current.downloadSuccessfulPleaseCheckYourDocumentFolder);
      } on FileSystemException catch (err) {
        EasyLoading.showError(err.message);
      }
    }

    if (Platform.isAndroid) {
      var status = await Permission.storage.status;
      if (status != PermissionStatus.granted) {
        status = await Permission.storage.request();
      }

      // Use the same condition as your working method
      if (true) {
        EasyLoading.show(status: lang.S.current.downloading);
        const downloadsFolderPath = '/storage/emulated/0/Download/';
        Directory dir = Directory(downloadsFolderPath);
        var file = File('${dir.path}/barcode_labels.pdf');

        // Exact same file conflict handling as your working method
        for (var i = 1; i < 20; i++) {
          if (await file.exists()) {
            try {
              await file.delete();
              break;
            } catch (e) {
              if (e.toString().contains('Cannot delete file')) {
                file = File('${file.path.replaceAll(RegExp(r'$$\d+$$?'), '').replaceAll('.pdf', '')}($i).pdf');
              }
            }
          } else {
            break;
          }
        }

        try {
          final byteData = await doc.save();
          await file.writeAsBytes(byteData.buffer.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));
          EasyLoading.dismiss();
          EasyLoading.showSuccess(lang.S.current.downloadSuccessfulPleaseCheckYourDocumentFolder);
        } on FileSystemException catch (err) {
          EasyLoading.showError(err.message);
        }
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final permissionService = PermissionService(ref);
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        centerTitle: true,
        title: Text(
          lang.S.of(context).printBarCode,
        ),
        backgroundColor: Colors.white,
        elevation: 0.0,
      ),
      body: PdfPreview(
        dynamicLayout: false,
        actionBarTheme: PdfActionBarTheme(
          backgroundColor: Colors.white,
        ),
        previewPageMargin: EdgeInsets.symmetric(horizontal: 16, vertical: 16),
        initialPageFormat: PdfPageFormat.a4,
        scrollViewDecoration: BoxDecoration(
          color: Colors.grey.shade50,
        ),
        pdfPreviewPageDecoration: const BoxDecoration(
          backgroundBlendMode: BlendMode.overlay,
          color: Colors.white,
        ),
        useActions: false,
        build: (format) => widget.pdfDocument.save(),
      ),
      bottomNavigationBar: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 16),
        child: ElevatedButton.icon(
          style: ElevatedButton.styleFrom(
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(8.0),
            ),
            backgroundColor: kMainColor,
            minimumSize: const Size(double.maxFinite, 48),
            textStyle: const TextStyle(
              color: Colors.white,
              fontSize: 18,
              fontWeight: FontWeight.w600,
            ),
          ),
          onPressed: () async {
            if (!permissionService.hasPermission(Permit.barcodesCreate.value)) {
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(
                  backgroundColor: Colors.red,
                  content: Text(lang.S.of(context).youDoNotHavePermissionToGenerateBarcode),
                ),
              );
              return;
            }
            await _saveBarcodeLabels(widget.pdfDocument);
            Navigator.of(context).pop();
          },
          icon: Icon(Icons.download),
          label: Text(
            lang.S.of(context).download,
            style: Theme.of(context).textTheme.titleLarge?.copyWith(
                  color: Colors.white,
                  fontWeight: FontWeight.w600,
                ),
          ),
        ),
      ),
    );
  }
}