Anonymous Sessions Use Cases

exports.onExecutePreUserRegistration = async (event, api) => {
  if (event.anonymous_session) {
    // Store reference to the anonymous session
    api.user.setAppMetadata(
      'linked_anonymous_id',
      event.anonymous_session.user_id
    );

    // Migrate cart data
    if (event.anonymous_session.metadata.cart) {
      api.user.setAppMetadata(
        'migrated_cart',
        event.anonymous_session.metadata.cart
      );
    }

    // Copy preferences to user metadata
    if (event.anonymous_session.metadata.preferences) {
      api.user.setUserMetadata(
        'preferences',
        event.anonymous_session.metadata.preferences
      );
    }
  }
};

exports.onExecutePostLogin = async (event, api) => {
  if (event.anonymous_session) {
    // Store last anonymous session reference
    api.user.setAppMetadata(
      'last_anonymous_session',
      event.anonymous_session.user_id
    );

    // Add anonymous cart to access token for your API to process
    api.accessToken.setCustomClaim(
      'anonymous_cart',
      event.anonymous_session.metadata.cart
    );

    // Track all linked sessions (optional)
    const linkedSessions =
      event.user.app_metadata?.linked_sessions || [];
    if (!linkedSessions.includes(event.anonymous_session.user_id)) {
      api.user.setAppMetadata('linked_sessions', [
        ...linkedSessions,
        event.anonymous_session.user_id,
      ]);
    }
  }
};

exports.onExecutePostLogin = async (event, api) => {
  if (!event.anonymous_session?.metadata?.cart) {
    return; // No anonymous cart to merge
  }

  const anonymousCart = event.anonymous_session.metadata.cart;
  const existingCart = event.user.app_metadata?.cart || { items: [] };

  // Merge cart items, combining quantities for matching SKUs
  const mergedItems = [...existingCart.items];
  for (const anonItem of anonymousCart.items) {
    const existingIndex = mergedItems.findIndex(
      (item) => item.sku === anonItem.sku
    );
    if (existingIndex >= 0) {
      mergedItems[existingIndex].qty += anonItem.qty;
    } else {
      mergedItems.push(anonItem);
    }
  }

  api.user.setAppMetadata('cart', { items: mergedItems });
  api.accessToken.setCustomClaim('cart', { items: mergedItems });
};

exports.onExecutePostLogin = async (event, api) => {
  if (!event.anonymous_session) return;

  const linkedSessions =
    event.user.app_metadata?.linked_sessions || [];

  // Option 1: Keep all linked sessions
  api.user.setAppMetadata('linked_sessions', [
    ...linkedSessions,
    {
      user_id: event.anonymous_session.user_id,
      linked_at: new Date().toISOString(),
      device: event.request.user_agent,
    },
  ]);

  // Option 2: Keep only the most recent
  api.user.setAppMetadata('last_anonymous_session', {
    user_id: event.anonymous_session.user_id,
    metadata: event.anonymous_session.metadata,
  });
};