Method datasetMove

app/src/API/Handlers/ProjectHandler.cpp:3506–3599

* @brief Moves a dataset to a new position within its group. */

 * @brief Moves a dataset to a new position within its group.
 */
API::CommandResponse API::Handlers::ProjectHandler::datasetMove(const QString& id,
                                                                const QJsonObject& params)
{
  if (!params.contains(Keys::UniqueId))
    return CommandResponse::makeError(
      id, ErrorCode::MissingParam, QStringLiteral("Missing required parameter: uniqueId"));

  if (!params.contains(QStringLiteral("newPosition")))
    return CommandResponse::makeError(
      id, ErrorCode::MissingParam, QStringLiteral("Missing required parameter: newPosition"));

  const int uniqueId    = params.value(Keys::UniqueId).toInt();
  const int newPosition = params.value(QStringLiteral("newPosition")).toInt();
  const bool isDryRun   = params.value(QStringLiteral("dryRun")).toBool(false);

  auto& pm           = DataModel::ProjectModel::instance();
  const auto& groups = pm.groups();

  const DataModel::Group* matchGroup     = nullptr;
  const DataModel::Dataset* matchDataset = nullptr;
  for (const auto& group : groups) {
    for (const auto& dataset : group.datasets) {
      if (dataset.uniqueId == uniqueId) {
        matchGroup   = &group;
        matchDataset = &dataset;
        break;
      }
    }
    if (matchDataset)
      break;
  }

  if (!matchDataset)
    return CommandResponse::makeError(
      id,
      ErrorCode::InvalidParam,
      QStringLiteral("Dataset not found for uniqueId %1").arg(uniqueId));

  const int oldPosition = matchDataset->datasetId;
  const int clampedNewId =
    std::clamp(newPosition, 0, static_cast<int>(matchGroup->datasets.size()) - 1);

  QJsonArray renumbered;
  for (const auto& d : matchGroup->datasets) {
    const int newId = projectedAfterMove(d.datasetId, oldPosition, clampedNewId);
    if (newId == d.datasetId)
      continue;

    QJsonObject row;
    row[QStringLiteral("groupId")]      = matchGroup->groupId;
    row[QStringLiteral("oldDatasetId")] = d.datasetId;
    row[QStringLiteral("newDatasetId")] = newId;
    row[Keys::UniqueId]                 = d.uniqueId;
    row[QStringLiteral("title")]        = d.title;
    renumbered.append(row);
  }

  qint64 preEpoch = 0;