sectsect · sectsect · Nov 26, 2024 · Nov 26, 2024 · Nov 26, 2024
diff --git a/README.md b/README.md
@@ -33,6 +33,7 @@
 - 🔍 Works with default WordPress tag and custom taxonomy systems
 - 🔢 Drag-and-Drop interface for easy tag reordering
 - 📊 Supports multiple post types and taxonomies
+- 🔧 **NEW: Programmatic Tag Order Management**
 - 🌐 **NEW: REST API Support**
   - Retrieve ordered tags via GET endpoint
   - Update tag order programmatically
@@ -126,6 +127,35 @@ if ( $terms && ! is_wp_error( $terms ) ) :
 <?php the_terms_ordered( $post->ID, 'post_tag' ); ?>
 ```
 
+## Programmatic Tag Order Management
+
+The plugin provides a `Tag_Updater` class for developers to programmatically manage tag order:
+
+```php
+$tag_updater = new \WP_Tag_Order\Tag_Updater();
+
+try {
+    // Update tag order using an array or comma-separated string
+    $result = $tag_updater->update_tag_order(
+        get_the_ID(),   // Post ID
+        'post_tag',     // Taxonomy that enabled in plugin settings
+        [1, 2, 3]       // Tag IDs in desired order
+    );
+} catch ( \InvalidArgumentException $e ) {
+    // Error handling
+    error_log( $e->getMessage() );
+}
+```
+
+This class allows flexible tag order updates directly from your theme or custom plugin code, supporting both array and string inputs with robust validation.
+
+#### Return Value
+
+`update_tag_order()` returns: `int|bool`
+- `int`: Meta ID if the tag order meta key didn't previously exist
+- `true`: Successful update of existing meta
+- `false`: Update failed or the new tag order is identical to the existing order
+
 ## REST API
 
 The WP Tag Order plugin provides two REST API endpoints for managing tag order:

diff --git a/includes/class-tag-updater.php b/includes/class-tag-updater.php
@@ -0,0 +1,89 @@
+<?php
+/**
+ * WP Tag Order Tag Updater Class
+ *
+ * Provides a method to update tag order for a specific post and taxonomy.
+ *
+ * @package WP_Tag_Order
+ * @since 3.11.0
+ */
+
+declare(strict_types=1);
+
+namespace WP_Tag_Order;
+
+/**
+ * Class responsible for updating tag order for a specific post.
+ */
+class Tag_Updater {
+	/**
+	 * Update tag order for a specific post and taxonomy.
+	 *
+	 * @param int               $post_id  The post ID to update tags for.
+	 * @param string            $taxonomy The taxonomy name.
+	 * @param array<int>|string $tag_ids  Array of tag IDs or comma-separated tag IDs.
+	 *
+	 * @return int|bool True if meta update was successful, false otherwise.
+	 * @throws \InvalidArgumentException If input validation fails.
+	 */
+	public function update_tag_order( int $post_id, string $taxonomy, array|string $tag_ids ): int|bool {
+		// Validate inputs.
+		if ( $post_id <= 0 ) {
+			throw new \InvalidArgumentException( 'Invalid post ID' );
+		}
+
+		if ( empty( $taxonomy ) ) {
+			throw new \InvalidArgumentException( 'Taxonomy cannot be empty' );
+		}
+
+		if ( ! taxonomy_exists( $taxonomy ) ) {
+			throw new \InvalidArgumentException( sprintf( 'Invalid taxonomy: %s', esc_html( $taxonomy ) ) );
+		}
+
+		if ( is_taxonomy_hierarchical( $taxonomy ) ) {
+			throw new \InvalidArgumentException( sprintf( 'Taxonomy %s is hierarchical and not supported', esc_html( $taxonomy ) ) );
+		}
+
+		// Convert string to array if needed.
+		if ( is_string( $tag_ids ) ) {
+			$tag_ids = explode( ',', wp_unslash( $tag_ids ) );
+		}
+
+		if ( empty( $tag_ids ) ) {
+			throw new \InvalidArgumentException( 'Tag IDs cannot be empty' );
+		}
+
+		if ( ! wto_is_enabled_taxonomy( $taxonomy ) ) {
+			throw new \InvalidArgumentException( sprintf( 'Taxonomy %s is not enabled for tag ordering', esc_html( $taxonomy ) ) );
+		}
+
+		// Sanitize tag IDs.
+		$sanitized_tag_ids = array_map(
+			function ( $tag_id ): int {
+				// Ensure each tag ID is a positive integer.
+				$sanitized_id = filter_var(
+					$tag_id,
+					FILTER_VALIDATE_INT,
+					array(
+						'options' => array(
+							'min_range' => 1,
+						),
+					)
+				);
+
+				if ( false === $sanitized_id ) {
+					throw new \InvalidArgumentException( 'Invalid tag ID: ' . esc_html( is_string( $tag_id ) ? $tag_id : (string) $tag_id ) );
+				}
+
+				return $sanitized_id;
+			},
+			$tag_ids
+		);
+
+		// Serialize tags for storage.
+		$meta_box_tags_value = serialize( $sanitized_tag_ids );
+
+		// Update post meta.
+		return update_post_meta( $post_id, 'wp-tag-order-' . $taxonomy, $meta_box_tags_value );
+	}
+}
diff --git a/includes/index.php b/includes/index.php
@@ -425,12 +425,18 @@ function ajax_wto_update_tags(): void {
 		exit;
 	}
 
-	$newordertags        = array_map( 'sanitize_text_field', explode( ',', wp_unslash( $tags ) ) );
-	$meta_box_tags_value = serialize( $newordertags );
-	$result              = update_post_meta( intval( $id ), 'wp-tag-order-' . $taxonomy, $meta_box_tags_value );
+	try {
+		$tag_updater = new \WP_Tag_Order\Tag_Updater();
+		$result      = $tag_updater->update_tag_order(
+			intval( $id ),
+			$taxonomy,
+			$tags
+		);
 
-	echo wp_json_encode( $result );
-	exit;
+		wp_send_json_success( $result );
+	} catch ( \InvalidArgumentException $e ) {
+		wp_send_json_error( $e->getMessage(), 400 );
+	}
 }
 add_action( 'wp_ajax_wto_update_tags', 'ajax_wto_update_tags' );
 add_action( 'wp_ajax_nopriv_wto_update_tags', 'ajax_wto_update_tags' );

diff --git a/includes/rest-api.php b/includes/rest-api.php
@@ -327,14 +327,14 @@ function ( $tag_id ) use ( $taxonomy ) {
 		}
 
 		// Prepare and update metadata.
-		$meta_box_tags_value = serialize( $tags );
-		$meta_result         = update_post_meta( $post_id, 'wp-tag-order-' . $taxonomy, $meta_box_tags_value );
+		$tag_updater = new \WP_Tag_Order\Tag_Updater();
+		$result      = $tag_updater->update_tag_order( $post_id, $taxonomy, $tags );
 
 		// Update post terms.
 		$term_taxonomy_ids = wp_set_object_terms( $post_id, $tags, $taxonomy );
 
 		// Handle metadata update failure.
-		if ( false === $meta_result ) {
+		if ( false === $result ) {
 			return rest_ensure_response(
 				array(
 					'success' => false,

diff --git a/tests/bootstrap.php b/tests/bootstrap.php
@@ -37,6 +37,7 @@
  */
 function _manually_load_plugin() {
 	require dirname( __DIR__, 1 ) . '/wp-tag-order.php';
+	require_once dirname( __DIR__, 1 ) . '/includes/class-tag-updater.php';
 }
 
 tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );

diff --git a/tests/class-test-tag-updater.php b/tests/class-test-tag-updater.php
@@ -0,0 +1,196 @@
+<?php
+/**
+ * Test Tag_Updater Class
+ *
+ * @package WP_Tag_Order
+ * @since 3.11.0
+ */
+
+declare(strict_types=1);
+
+namespace WP_Tag_Order\Tests;
+
+use WP_Tag_Order\Tag_Updater;
+use WP_UnitTestCase;
+
+/**
+ * Test cases for Tag_Updater class
+ */
+class Test_Tag_Updater extends WP_UnitTestCase {
+	/**
+	 * Tag_Updater instance
+	 *
+	 * @var Tag_Updater
+	 */
+	private $tag_updater;
+
+	/**
+	 * Test taxonomy name
+	 *
+	 * @var string
+	 */
+	private $test_taxonomy;
+
+	/**
+	 * Setup before each test.
+	 * Enables specific taxonomy for the plugin.
+	 */
+	protected function setUp(): void {
+		parent::setUp();
+		$this->tag_updater   = new Tag_Updater();
+		$this->test_taxonomy = 'post_tag';
+
+		// Ensure the test taxonomy is enabled for the plugin.
+		add_filter( 'wto_is_enabled_taxonomy', array( $this, 'enable_test_taxonomy' ), 10, 1 );
+
+		// Register test taxonomy if not already registered.
+		if ( ! taxonomy_exists( $this->test_taxonomy ) ) {
+			register_taxonomy( $this->test_taxonomy, 'post' );
+		}
+
+		// Enable specific taxonomy for the test.
+		$enabled_taxonomies = array( 'post_tag' );
+		update_option( 'wpto_enabled_taxonomies', $enabled_taxonomies );
+	}
+
+	/**
+	 * Teardown after each test.
+	 * Resets the enabled taxonomies option.
+	 */
+	protected function tearDown(): void {
+		// Remove the filter after the test.
+		remove_filter( 'wto_is_enabled_taxonomy', array( $this, 'enable_test_taxonomy' ) );
+
+		// Reset the enabled taxonomies option.
+		delete_option( 'wpto_enabled_taxonomies' );
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Mock method to enable test taxonomy for the plugin
+	 *
+	 * @param string $taxonomy Taxonomy name.
+	 * @return bool
+	 */
+	public function enable_test_taxonomy( $taxonomy ): bool {
+		return $taxonomy === $this->test_taxonomy;
+	}
+
+	/**
+	 * Test successful tag order update
+	 *
+	 * @covers Tag_Updater::update_tag_order
+	 */
+	public function test_update_tag_order_with_array(): void {
+		// Create a test post.
+		$post_id = $this->factory()->post->create();
+
+		// Create test tags.
+		$tag_ids = array(
+			$this->factory()->term->create( array( 'taxonomy' => $this->test_taxonomy ) ),
+			$this->factory()->term->create( array( 'taxonomy' => $this->test_taxonomy ) ),
+			$this->factory()->term->create( array( 'taxonomy' => $this->test_taxonomy ) ),
+		);
+
+		// Update tag order.
+		$result = $this->tag_updater->update_tag_order( $post_id, $this->test_taxonomy, $tag_ids );
+
+		$this->assertNotFalse( $result, 'Failed to update metadata for tag order' );
+
+		// Verify meta was saved correctly.
+		$saved_tags = unserialize( get_post_meta( $post_id, 'wp-tag-order-' . $this->test_taxonomy, true ) );
+		$this->assertSame( $tag_ids, $saved_tags );
+	}
+
+	/**
+	 * Test tag order update with comma-separated string
+	 *
+	 * @covers Tag_Updater::update_tag_order
+	 */
+	public function test_update_tag_order_with_string(): void {
+		// Create a test post.
+		$post_id = $this->factory()->post->create();
+
+		// Create test tags.
+		$tag_ids = array(
+			$this->factory()->term->create( array( 'taxonomy' => $this->test_taxonomy ) ),
+			$this->factory()->term->create( array( 'taxonomy' => $this->test_taxonomy ) ),
+		);
+
+		$tag_ids_string = implode( ',', $tag_ids );
+
+		// Update tag order.
+		$result = $this->tag_updater->update_tag_order( $post_id, $this->test_taxonomy, $tag_ids_string );
+
+		$this->assertNotFalse( $result, 'Failed to update metadata for tag order' );
+
+		// Verify meta was saved correctly.
+		$saved_tags = unserialize( get_post_meta( $post_id, 'wp-tag-order-' . $this->test_taxonomy, true ) );
+		$this->assertSame( $tag_ids, $saved_tags );
+	}
+
+	/**
+	 * Test invalid post ID throws exception
+	 *
+	 * @covers Tag_Updater::update_tag_order
+	 */
+	public function test_update_tag_order_with_invalid_post_id(): void {
+		$this->expectException( \InvalidArgumentException::class );
+		$this->expectExceptionMessage( 'Invalid post ID' );
+
+		$this->tag_updater->update_tag_order( 0, $this->test_taxonomy, array( 1 ) );
+	}
+
+	/**
+	 * Test empty taxonomy throws exception
+	 *
+	 * @covers Tag_Updater::update_tag_order
+	 */
+	public function test_update_tag_order_with_empty_taxonomy(): void {
+		$this->expectException( \InvalidArgumentException::class );
+		$this->expectExceptionMessage( 'Taxonomy cannot be empty' );
+
+		$post_id = $this->factory()->post->create();
+		$this->tag_updater->update_tag_order( $post_id, '', array( 1 ) );
+	}
+
+	/**
+	 * Test non-existent taxonomy throws exception
+	 *
+	 * @covers Tag_Updater::update_tag_order
+	 */
+	public function test_update_tag_order_with_non_existent_taxonomy(): void {
+		$this->expectException( \InvalidArgumentException::class );
+		$this->expectExceptionMessage( 'Invalid taxonomy: non_existent_taxonomy' );
+
+		$post_id = $this->factory()->post->create();
+		$this->tag_updater->update_tag_order( $post_id, 'non_existent_taxonomy', array( 1 ) );
+	}
+
+	/**
+	 * Test empty tag IDs throws exception
+	 *
+	 * @covers Tag_Updater::update_tag_order
+	 */
+	public function test_update_tag_order_with_empty_tag_ids(): void {
+		$this->expectException( \InvalidArgumentException::class );
+		$this->expectExceptionMessage( 'Tag IDs cannot be empty' );
+
+		$post_id = $this->factory()->post->create();
+		$this->tag_updater->update_tag_order( $post_id, $this->test_taxonomy, array() );
+	}
+
+	/**
+	 * Test invalid tag ID throws exception
+	 *
+	 * @covers Tag_Updater::update_tag_order
+	 */
+	public function test_update_tag_order_with_invalid_tag_id(): void {
+		$this->expectException( \InvalidArgumentException::class );
+		$this->expectExceptionMessage( 'Invalid tag ID: invalid' );
+
+		$post_id = $this->factory()->post->create();
+		$this->tag_updater->update_tag_order( $post_id, $this->test_taxonomy, array( 'invalid' ) );
+	}
+}
diff --git a/wp-tag-order.php b/wp-tag-order.php
@@ -77,6 +77,7 @@ function my_plugin_row_meta( array $plugin_meta, string $plugin_file, array $plu
 
 if ( wptagorder_phpversioncheck() ) {
 	require_once plugin_dir_path( __FILE__ ) . 'includes/functions.php';
+	require_once plugin_dir_path( __FILE__ ) . 'includes/class-tag-updater.php';
 	require_once plugin_dir_path( __FILE__ ) . 'includes/category-template.php';
 	require_once plugin_dir_path( __FILE__ ) . 'includes/index.php';
 	require_once plugin_dir_path( __FILE__ ) . 'includes/rest-api.php';