Use cache oldest created at in template

[MAILPOET-3646]

assets/js/src/mailpoet.js

@@ -21,6 +21,7 @@ var MailPoet = {
   apiVersion: window.mailpoet_api_version,
   emailRegex: window.mailpoet_email_regex,
   wpSegmentState: window.mailpoet_wp_segment_state,
+  subscribersCountsCacheCreatedAt: window.mailpoet_subscribers_counts_cache_created_at,
   getShortcodeLinks: () => (window.mailpoet_shortcode_links ? window.mailpoet_shortcode_links : []),
 };
 

assets/js/src/segments/heading.jsx

@@ -26,7 +26,9 @@ const ListHeading = () => (
       subscribersInPlanLimit={MailPoet.subscribersLimit}
     />
 
-    <SubscribersCacheMessage cacheCalculation="2021-06-28 18:22:00" />
+    <SubscribersCacheMessage
+      cacheCalculation={window.mailpoet_subscribers_counts_cache_created_at}
+    />
 
     <SubscribersLimitNotice />
     <InvalidMssKeyNotice

lib/AdminPages/Pages/Segments.php

@@ -4,6 +4,7 @@ namespace MailPoet\AdminPages\Pages;
 
 use MailPoet\AdminPages\PageRenderer;
 use MailPoet\API\JSON\ResponseBuilders\CustomFieldsResponseBuilder;
+use MailPoet\Cache\TransientCache;
 use MailPoet\Config\ServicesChecker;
 use MailPoet\CustomFields\CustomFieldsRepository;
 use MailPoet\Entities\DynamicSegmentFilterData;
@@ -16,6 +17,7 @@ use MailPoet\Util\License\Features\Subscribers as SubscribersFeature;
 use MailPoet\WooCommerce\Helper as WooCommerceHelper;
 use MailPoet\WP\AutocompletePostListLoader as WPPostListLoader;
 use MailPoet\WP\Functions as WPFunctions;
+use MailPoetVendor\Carbon\Carbon;
 
 class Segments {
   /** @var PageRenderer */
@@ -51,6 +53,9 @@ class Segments {
   /** @var CustomFieldsResponseBuilder */
   private $customFieldsResponseBuilder;
 
+  /** @var TransientCache */
+  private $transientCache;
+
   public function __construct(
     PageRenderer $pageRenderer,
     PageLimit $listingPageLimit,
@@ -62,7 +67,8 @@ class Segments {
     SettingsController $settings,
     CustomFieldsRepository $customFieldsRepository,
     CustomFieldsResponseBuilder $customFieldsResponseBuilder,
-    SegmentDependencyValidator $segmentDependencyValidator
+    SegmentDependencyValidator $segmentDependencyValidator,
+    TransientCache $transientCache
   ) {
     $this->pageRenderer = $pageRenderer;
     $this->listingPageLimit = $listingPageLimit;
@@ -75,6 +81,7 @@ class Segments {
     $this->segmentDependencyValidator = $segmentDependencyValidator;
     $this->customFieldsRepository = $customFieldsRepository;
     $this->customFieldsResponseBuilder = $customFieldsResponseBuilder;
+    $this->transientCache = $transientCache;
   }
 
   public function render() {
@@ -123,7 +130,9 @@ class Segments {
     $wooCurrencySymbol = $this->woocommerceHelper->isWooCommerceActive() ? $this->woocommerceHelper->getWoocommerceCurrencySymbol() : '';
     $data['woocommerce_currency_symbol'] = html_entity_decode($wooCurrencySymbol);
     $data['tracking_enabled'] = $this->settings->get('tracking.enabled');
-
+    $subscribersCacheCreatedAt = $this->transientCache->getOldestCreatedAt(TransientCache::SUBSCRIBERS_STATISTICS_COUNT_KEY);
+    $subscribersCacheCreatedAt = $subscribersCacheCreatedAt ?: Carbon::now();
+    $data['subscribers_counts_cache_created_at'] = $subscribersCacheCreatedAt->format('Y-m-d\TH:i:sO');
     $this->pageRenderer->displayPage('segments.html', $data);
   }
 }

views/segments.html

@@ -33,6 +33,7 @@
     var mailpoet_woocommerce_currency_symbol = <%= json_encode(woocommerce_currency_symbol)  %>;
     var mailpoet_woocommerce_countries = <%= json_encode(woocommerce_countries)  %>;
     var mailpoet_tracking_enabled = <%= json_encode(tracking_enabled) %>;
+    var mailpoet_subscribers_counts_cache_created_at = <%= json_encode(subscribers_counts_cache_created_at) %>;
 
   </script>
 <% endblock %>