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

Future<Response> handleFileUpload(Request request) async {
  final start = Jiffy.now();

  // 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

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

  final supabaseurl = request.headers['supabaseurl'] ?? "http://kong:8000";
  // Initialize Supabase client with the bearer token
  final supabase = SupabaseClient(
    // 'http://baas.fares.cyou:8000',
    supabaseurl,
    token,
  );

  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) {
          print("File Uploaded: $filename");
          // Create temporary file
          final tempFile = File('uploads/$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
          //print("inserting incsvhichupdates");

          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
          final archiveFilename = 'upload/${timestamp}_$filename';
          await supabase.storage.from('csvhich_archive').uploadBinary(
                archiveFilename,
                bytes,
                fileOptions: FileOptions(
                  upsert: true,
                  contentType: part.headers['content-type'],
                ),
              );

          final myChannel = supabase.channel('csvhichstorage');

          myChannel.subscribe((status, error) async {
            if (status == RealtimeSubscribeStatus.subscribed) {
              final serverResponse = await myChannel.sendBroadcastMessage(
                event: "upload",
                payload: {
                  "filename": filename,
                  "updated_at": now,
                },
              );

              print('serverResponse: $serverResponse');
            }
          });

          // 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("   realtime response: $res");

          await processCsvData(tempFile, supabase);

          //add filename ta list
          uploadedFiles.add({
            'filename': filename,
            'updated_at': now,
          });
          final end = Jiffy.now();
          print(
              "                                        ${DTInterval(start, end).duration.inMilliseconds / 1000} seconds\n");
          // Clean up temporary file
          await tempFile.delete();
        }
      }
    }

    supabase.dispose();
    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 {
    supabase.dispose();
    return Response(401, body: 'Not a multipart request');
  }
}