add admin hook to change collection color

src/functions.php

@@ -214,4 +214,5 @@ add_action('pre_get_posts', function($query) {
 
 require get_template_directory() . '/functions/customizer.php';
 require get_template_directory() . '/functions/pagination.php';
-require get_template_directory() . '/functions/single-functions.php';
+require get_template_directory() . '/functions/single-functions.php';
+require get_template_directory() . '/functions/collection-color.php';

src/functions/collection-color.php

@@ -0,0 +1,60 @@
+<?php
+
+
+class TainacanThemeCollectionColor {
+
+
+    public $meta_name = 'tainacan_theme_collection_color';
+    
+    function __construct() {
+        add_filter('tainacan-api-response-collection-meta', [$this, 'add_meta_to_response'], 10, 2);
+
+        add_action('tainacan-register-admin-hooks', [$this, 'register_hook']);
+
+        add_action('tainacan-insert-tainacan-collection', [$this, 'save_meta']);
+
+    }
+
+    function register_hook() {
+        if (function_exists('register_admin_hook')) {
+            register_admin_hook( 'collection', [$this, 'form'] );
+        }
+    }
+
+    function form() {
+
+        ob_start();
+        ?>
+
+        <input type="text" value="pink" name="<?php echo $this->meta_name; ?>" />
+
+        <?php
+
+
+        return ob_get_clean();
+
+    }
+
+    function add_meta_to_response($extra_meta, $request) {
+        $extra_meta[] = $this->meta_name;
+        return $extra_meta;
+    }
+
+    function save_meta($object) {
+        global $HTTP_RAW_POST_DATA;
+        $post = json_decode($HTTP_RAW_POST_DATA);
+        
+        if ($object->can_edit()) {
+            if (isset($post->{$this->meta_name})) {
+                update_post_meta($object->get_id(), $this->meta_name, $post->{$this->meta_name});
+            }
+        }
+
+    }
+
+
+}
+
+new TainacanThemeCollectionColor();
+
+?>