notas/lib/data/note_body.dart

import 'dart:convert';

import 'package:flutter_quill/flutter_quill.dart';

Document noteBodyToDocument(String storedBody) {
  final String trimmedBody = storedBody.trimLeft();

  if (trimmedBody.startsWith('[')) {
    try {
      final dynamic decoded = jsonDecode(storedBody);
      if (decoded is List) {
        return Document.fromJson(decoded);
      }
    } catch (_) {
      // Fall back to plain text for legacy notes or malformed JSON.
    }
  }

  if (storedBody.isEmpty) {
    return Document();
  }

  final String plainText = storedBody.endsWith('\n')
      ? storedBody
      : '$storedBody\n';

  return Document.fromJson(<dynamic>[
    <String, String>{'insert': plainText},
  ]);
}

String noteBodyToPlainText(String storedBody) {
  return noteBodyToDocument(storedBody).toPlainText();
}

String noteDocumentToStorageJson(Document document) {
  return jsonEncode(document.toDelta().toJson());
}