script.liquid

{% unless options.email_when_a_customer_declines_an_invitation__boolean or options.email_when_a_customer_account_is_disabled__boolean or options.email_when_a_customer_initially_sets_an_account_password__boolean or options.email_when_a_customer_is_invited__boolean %}
  {"error": "Choose at least one condition for sending an email."}
{% endunless %}

{% assign state_transition_descriptions = hash %}
{% assign state_transition_descriptions["DECLINED"] = "A customer has declined an invitation" %}
{% assign state_transition_descriptions["DISABLED"] = "A customer account has been disabled" %}
{% assign state_transition_descriptions["ENABLED"] = "A customer has set an initial account password" %}
{% assign state_transition_descriptions["INVITED"] = "A customer has been invited" %}

{% capture query %}
  query {
    customer(id: {{ customer.admin_graphql_api_id | json }}) {
      state
      previousStateMetafield: metafield(
        namespace: "mechanic"
        key: "previous-state"
      ) {
        id
        value
      }
    }
  }
{% endcapture %}

{% assign result = query | shopify %}

{% if event.preview %}
  {% assign metafield = hash %}
  {% if options.email_when_a_customer_declines_an_invitation__boolean %}
    {% assign metafield["value"] = "DECLINED" %}
  {% elsif options.email_when_a_customer_account_is_disabled__boolean %}
    {% assign metafield["value"] = "DISABLED" %}
  {% elsif options.email_when_a_customer_initially_sets_an_account_password__boolean %}
    {% assign metafield["value"] = "ENABLED" %}
  {% elsif options.email_when_a_customer_is_invited__boolean %}
    {% assign metafield["value"] = "INVITED" %}
  {% endif %}
{% else %}
  {% assign metafield = result.data.customer.previousStateMetafield %}
{% endif %}

{% assign oldState = metafield.value %}
{% assign newState = result.data.customer.state %}

{% if oldState != newState %}
  {% if event.topic == "shopify/customers/update" and oldState != blank %}
    {% assign send_email = false %}

    {% if newState == "DECLINED" and options.email_when_a_customer_declines_an_invitation__boolean %}
      {% assign send_email = true %}
    {% elsif newState == "DISABLED" and options.email_when_a_customer_account_is_disabled__boolean %}
      {% assign send_email = true %}
    {% elsif newState == "ENABLED" and options.email_when_a_customer_initially_sets_an_account_password__boolean %}
      {% assign send_email = true %}
    {% elsif newState == "INVITED" and options.email_when_a_customer_is_invited__boolean %}
      {% assign send_email = true %}
    {% endif %}

    {% if send_email %}
      {% assign email_subject = "[" | append: shop.name | append: "] " | append: state_transition_descriptions[newState] %}

      {% capture email_body %}
        Hello,

        {{ state_transition_descriptions[newState] }}.

        Customer email: {{ customer.email | default: "(unknown)" }}
        Customer name: {{ customer.first_name | append: " " | append: customer.last_name | strip | default: "(unknown)" }}

        <a href="https://{{ shop.domain }}/admin/customers/{{ customer.id }}">Manage this customer</a>

        Thanks,
        Mechanic (for {{ shop.name }})
      {% endcapture %}

      {% action "email" %}
        {
          "to": {{ options.email_recipient__email_required | json }},
          "subject": {{ email_subject | json }},
          "body": {{ email_body | unindent | strip | newline_to_br | json }},
          "reply_to": {{ shop.customer_email | json }},
          "from_display_name": {{ shop.name | json }}
        }
      {% endaction %}
    {% endif %}
  {% endif %}

  {% action "shopify" %}
    mutation {
      customerUpdate(
        input: {
          id: {{ customer.admin_graphql_api_id | json }}
          metafields: [
            {
              id: {{ metafield.id | json }}
              namespace: "mechanic"
              key: "previous-state"
              type: "single_line_text_field"
              value: {% if event.preview %}"DISABLED"{% else %}{{ newState | json }}{% endif %}
            }
          ]
        }
      ) {
        userErrors {
          field
          message
        }
      }
    }
  {% endaction %}
{% endif %}