myshelf/lib/handlers/upload_handler.dart

import 'dart:io';
import 'package:myshelf/models/data.dart';
import 'package:shelf/shelf.dart';
import 'package:shelf_multipart/shelf_multipart.dart';
import 'package:supabase/supabase.dart';

Future<Response> handleFileUpload(Request request) async {
  // Check authorization
  final authHeader = request.headers['authorization'];
  if (authHeader == null || !authHeader.startsWith('Bearer ')) {
    return Response.forbidden('Authorization header missing or invalid');
  }
  final token = authHeader.substring(7); // Remove 'Bearer ' prefix

  // Initialize Supabase client with the bearer token
  final supabase = SupabaseClient(
    'http://baas.fares.cyou:8000',
    token,
  );

  final contentType = request.headers['content-type'];
  if (contentType == null || !contentType.contains('multipart/form-data')) {
    return Response(400, body: 'Unsupported content-type');
  }

  if (request.multipart() case var multipart?) {
    List<Map<String, dynamic>> uploadedFiles = [];
    await for (final part in multipart.parts) {
      final contentDisposition = part.headers['content-disposition'];
      if (contentDisposition != null &&
          contentDisposition.contains('filename=')) {
        final name =
            RegExp(r'name="([^"]*)"').firstMatch(contentDisposition)?.group(1);
        final filename = RegExp(r'filename="([^"]*)"')
            .firstMatch(contentDisposition)
            ?.group(1);

        if (name != null && name != "" && filename != null) {
          try {
            // Create temporary file
            final tempFile = File('uploads/$filename');
            await tempFile.create(recursive: true);
            await part.pipe(tempFile.openWrite());

            // Upload to Supabase
            final bytes = await tempFile.readAsBytes();
            await supabase.storage.from('csvhich').uploadBinary(
                  filename,
                  bytes,
                  fileOptions: FileOptions(
                    upsert: true,
                    contentType: part.headers['content-type'],
                  ),
                );

            //insertline in csvhichupdates
            await supabase.from('csvhichupdates').insert({
              'filename': filename,
              'updated_at': DateTime.now().toUtc().toIso8601String(),
            });

            //copy file to csvhich archive
            final nowdt = DateTime.now().toUtc();
            final now = nowdt.toIso8601String();
            // final timestamp ='${nowdt.year}${nowdt.month.toString().padLeft(2, '0')}${nowdt.day.toString().padLeft(2, '0')}_${nowdt.hour.toString().padLeft(2, '0')}${nowdt.minute.toString().padLeft(2, '0')}';
            final timestamp = nowdt.millisecondsSinceEpoch.toString();

            //upload file to storage archive bucket
            try {
              final archiveFilename = 'upload/${timestamp}_$filename';
              await supabase.storage.from('csvhich_archive').uploadBinary(
                    archiveFilename,
                    bytes,
                    fileOptions: FileOptions(
                      upsert: true,
                      contentType: part.headers['content-type'],
                    ),
                  );
            } catch (e) {
              print('Error uploading to archive: $e');
              // Continue execution even if archive upload fails
            }

            await processCsvData(tempFile, supabase);

            // No need to subscribe to channel
            final channel = supabase.channel('csvhichstorage');
            final res = await channel.sendBroadcastMessage(
              event: "upload",
              payload: {
                "filename": filename,
                "updated_at": now,
              },
            );
            print("fileupload: realtime res: $res");

            //add filename ta list
            uploadedFiles.add({
              'filename': filename,
              'updated_at': now,
            });

            // Clean up temporary file
            await tempFile.delete();
          } catch (e) {
            print("Error processing file:\n $e");
            return Response.internalServerError(body: e.toString());
          }
        }
      }
    }

    if (uploadedFiles.isNotEmpty) {
      return Response.ok(
        '{"status": "success", "files": ${uploadedFiles.toString()}}',
        headers: {'Content-Type': 'application/json'},
      );
    }

    return Response(400, body: 'No files were uploaded');
  } else {
    return Response(401, body: 'Not a multipart request');
  }
}