quantity.liquid for tiered-pricing

gistfile1.html

{% comment %}
Here you ignore products that don't have exactly the number of variants you use for your 
tiered-priced products. Edit that number if your tiered-price products have more than 3 variants.
{% endcomment %}
{% if item.product.variants.size == 3 %}

  {% assign found_variant = false %}
  {% assign index = 1 %}

  {% comment %}Determining if our item is the 1st, 2nd or 3rd variant of its product.{% endcomment %} 
  {% for variant in item.product.variants %}
  {% if found_variant == false and variant.id == item.id %}
    {% assign found_variant = true %}
    {% assign index = forloop.index %}
  {% endif %}
  {% endfor %}

  {% if found_variant %}
    {% case index %}
    
      {% comment %}First variant: less expensive one{% endcomment %}
      {% comment %}Edit the 3 occurrences of the number 100 here.{% endcomment %}  
      {% when 1 %}
        {% if item.quantity < 100 %}
        <input type="text" class="field" name="updates[{{ item.id }}]" id="updates_{{ item.id }}" value="100" />
        {% assign needs_update = true %}
        {% else %}
        <input type="text" class="field" name="updates[{{ item.id }}]" id="updates_{{ item.id }}" value="{{ item.quantity }}" min="100" />
        {% endif %}
        
      {% comment %}Second variant{% endcomment %}
      {% comment %}Edit the 3 occurrences of the number 50 and the 1 occurrence of the number 99 here.{% endcomment %} 
      {% when 2 %}
        {% if item.quantity < 50 %}
        <input type="text" class="field" name="updates[{{ item.id }}]" id="updates_{{ item.id }}" value="50" />
        {% assign needs_update = true %}
        {% else %}
        <input type="text" class="field" name="updates[{{ item.id }}]" id="updates_{{ item.id }}" value="{{ item.quantity }}" min="50" max="99" />
        {% endif %}

      {% comment %}Third variant - minimum quantity is 1{% endcomment %}
      {% comment %}Edit the 1 occurrence of the number 49 here.{% endcomment %} 
      {% when 3 %}
        <input type="text" class="field" name="updates[{{ item.id }}]" id="updates_{{ item.id }}" value="{{ item.quantity }}" min="0" max="49" />

      {% comment %}If you have more variants (prices) than 3 add a case, or more, here.{% endcomment %}

    {% endcase %}
  {% else %}
  <input type="text" class="field" name="updates[{{ item.id }}]" id="updates_{{ item.id }}" value="{{ item.quantity }}" />
  {% endif %}

{% else %}
<input type="text" class="field" name="updates[{{ item.id }}]" id="updates_{{ item.id }}" value="{{ item.quantity }}" />
{% endif %}