const FEATURE_FLAGS_CHANGED_EVENT = "feature-flags-changed";

/**
 * Creates the Socket.IO payload used to tell browsers that feature flags changed.
 */
const createFeatureFlagsChangedPayload = ({ bodyshopId = null, source = "unknown", table = null, name = null } = {}) => ({
  bodyshopId,
  changedAt: new Date().toISOString(),
  name,
  scope: bodyshopId ? "bodyshop" : "global",
  source,
  table
});

/**
 * Emits a feature-flag change event globally or to one bodyshop room.
 */
const emitFeatureFlagsChanged = ({ req, bodyshopId = null, source = "unknown", table = null, name = null } = {}) => {
  const io = req?.ioRedis;
  if (!io) return null;

  const payload = createFeatureFlagsChangedPayload({ bodyshopId, source, table, name });

  if (bodyshopId) {
    const room = req?.ioHelpers?.getBodyshopRoom
      ? req.ioHelpers.getBodyshopRoom(bodyshopId)
      : `bodyshop-broadcast-room:${bodyshopId}`;
    io.to(room).emit(FEATURE_FLAGS_CHANGED_EVENT, payload);
    return payload;
  }

  io.emit(FEATURE_FLAGS_CHANGED_EVENT, payload);
  return payload;
};

module.exports = {
  FEATURE_FLAGS_CHANGED_EVENT,
  createFeatureFlagsChangedPayload,
  emitFeatureFlagsChanged
};