{%- comment -%}
    Basic usage to get a random product from all your shop :
    {%- render 'random-product' -%}
    {{ random_product }} -> here's your random product

    Basic usage to get a random product from a specific collection :
    {%- render 'random-product' with specific_collection: 'sport' -%}
    {{ random_product }} -> here's your random product
{%- endcomment -%}

{%- if specific_collection -%}
    {%- assign all_products_from_collection = collections[specific_collection].products -%}
{%- else -%}
    {%- assign all_products_from_collection = collections['all'].products -%}
{%- endif -%}

{%- assign all_products_random = '' -%}

{%- for product_splitted in all_products_from_collection -%}
    {%- assign all_products_random = all_products_random | append: product_splitted.handle | append: ',' -%}
{%- endfor -%}

{%- assign all_products_random_splited = all_products_random | split: ',' -%}

{%- assign min = 0 -%}
{%- assign max = all_products_random_splited.size | minus: 1 -%}
{%- assign diff = max | minus: min -%}
{%- assign random_number = "now" | date: "%N" | modulo: diff | plus: min -%}

{%- assign random_product_slug = all_products_random_splited[random_number] -%}
{%- assign random_product = all_products[random_product_slug] -%}