script.liquid

{% assign collection = shop.collections[options.collection_id__number_required] %}

{% if event.preview != true and collection == nil %}
  {"error": {{ options.collection_id__number_required | json | prepend: "Unable to find collection " | json }}}
{% endif %}

{% assign products = collection.products %}

{% if event.preview %}
  {% assign products = array %}
  {% assign products[0] = '{"id":12345,"created_at":"2000-01-01"}' | parse_json %}

  {% comment %}
    Uncomment me for more testing!
    {% assign products[1] = '{"id":67890,"created_at":"2001-01-01"}' | parse_json %}
  {% endcomment %}
{% endif %}

{% assign products_sorted = products | sort: "created_at" %}

{% assign product_ids_to_delete = array %}
{% for product in products_sorted %}
  {% if forloop.index > options.number_of_products_to_delete_at_once__number_required %}
    {% break %}
  {% endif %}

  {% assign product_ids_to_delete[product_ids_to_delete.size] = product.id %}
{% endfor %}

{% if options.test_mode__boolean %}
  {% action "echo" %}
    {"product_ids_to_delete": {{ product_ids_to_delete | json }}}
  {% endaction %}
{% else %}
  {% for product_id in product_ids_to_delete %}
    {% action "shopify" %}
      [
        "delete",
        [
          "product",
          {{ product_id | json  }}
        ]
      ]
    {% endaction %}
  {% endfor %}
{% endif %}