v1.1.0

includes/class-ai-translator-mlp-integration.php

@@ -0,0 +1,174 @@
+<?php
+/**
+ * MultilingualPress integration for AI Translator.
+ *
+ * When MultilingualPress creates a new connected post (i.e. the editor saves
+ * a source post and MLP syncs it to another site for the first time), this
+ * class translates the source post's fields into the target site's language
+ * and writes the result back to the newly created remote post.
+ *
+ * The hook `multilingualpress.metabox_after_update_remote_post` fires while
+ * WordPress is already switched to the remote site, so wp_update_post() can
+ * be called directly without an additional switch_to_blog().
+ *
+ * This integration only activates when:
+ *   1. MultilingualPress is active (class_exists guard in bootstrap).
+ *   2. "Auto-translate on MLP sync" is enabled in the plugin settings.
+ *   3. An AI provider is configured for text generation.
+ *
+ * @package ROBOTSTXT\AI_Translator
+ * @since   1.1.0
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+if ( ! class_exists( 'AI_Translator_MLP_Integration' ) ) {
+
+	/**
+	 * Hooks into MultilingualPress post synchronization to auto-translate
+	 * newly connected posts.
+	 *
+	 * @since 1.1.0
+	 */
+	class AI_Translator_MLP_Integration {
+
+		/**
+		 * Settings handler.
+		 *
+		 * @since 1.1.0
+		 * @var AI_Translator_Settings
+		 */
+		private $settings;
+
+		/**
+		 * Translator handler.
+		 *
+		 * @since 1.1.0
+		 * @var AI_Translator_Translator
+		 */
+		private $translator;
+
+		/**
+		 * Constructor.
+		 *
+		 * @since 1.1.0
+		 *
+		 * @param AI_Translator_Settings   $settings   Settings handler.
+		 * @param AI_Translator_Translator $translator Translator handler.
+		 */
+		public function __construct( AI_Translator_Settings $settings, AI_Translator_Translator $translator ) {
+			$this->settings   = $settings;
+			$this->translator = $translator;
+		}
+
+		/**
+		 * Registers WordPress hooks.
+		 *
+		 * @since 1.1.0
+		 *
+		 * @return void
+		 */
+		public function register() {
+			add_action(
+				'multilingualpress.metabox_after_update_remote_post',
+				array( $this, 'on_mlp_after_update_remote_post' ),
+				10,
+				3
+			);
+		}
+
+		/**
+		 * Translates the source post and updates the newly created remote post.
+		 *
+		 * Fires while WordPress is switched to the remote site, so
+		 * wp_update_post() can be called directly.
+		 *
+		 * Only acts when:
+		 *  - $operation is 'new' (first connection, not an update).
+		 *  - The "auto_translate_on_mlp_create" setting is enabled.
+		 *  - An AI provider is configured for text generation.
+		 *
+		 * @since 1.1.0
+		 *
+		 * @param \Inpsyde\MultilingualPress\TranslationUi\Post\RelationshipContext $context   MLP relationship context.
+		 * @param array<string,scalar|null>                                         $post      Post data used to create the remote post.
+		 * @param string                                                            $operation 'new' = first connection, 'leave' = update.
+		 *
+		 * @return void
+		 */
+		public function on_mlp_after_update_remote_post( $context, $post, $operation ) {
+			unset( $post );
+
+			if ( 'new' !== $operation ) {
+				return;
+			}
+
+			$settings = $this->settings->get_settings();
+
+			if ( empty( $settings['auto_translate_on_mlp_create'] ) ) {
+				return;
+			}
+
+			if ( ! $this->translator->is_supported() ) {
+				return;
+			}
+
+			// We are already on the remote site (MLP switched before firing this hook).
+			// get_blog_option() with the explicit site ID is safe and avoids relying
+			// on locale globals that may not be updated after switch_to_blog().
+			$raw_locale    = get_blog_option( $context->remoteSiteId(), 'WPLANG' );
+			$target_locale = is_string( $raw_locale ) && '' !== $raw_locale ? $raw_locale : 'en_US';
+
+			// sourcePost() performs switch_to_blog internally and restores afterward.
+			$source_post = $context->sourcePost();
+
+			if ( ! $source_post instanceof WP_Post ) {
+				return;
+			}
+
+			$remote_post_id = $context->remotePostId();
+			$update         = array( 'ID' => $remote_post_id );
+			$has_changes    = false;
+
+			// ── Translate title ──────────────────────────────────────────────
+
+			if ( ! empty( $settings['translate_title'] ) && '' !== trim( $source_post->post_title ) ) {
+				$translated = $this->translator->translate( $source_post->post_title, $target_locale );
+				if ( ! is_wp_error( $translated ) && '' !== $translated ) {
+					$update['post_title'] = $translated;
+					$has_changes          = true;
+				}
+			}
+
+			// ── Translate content ────────────────────────────────────────────
+
+			if ( ! empty( $settings['translate_content'] ) && '' !== trim( $source_post->post_content ) ) {
+				$translated = $this->translator->translate( $source_post->post_content, $target_locale );
+				if ( ! is_wp_error( $translated ) && '' !== $translated ) {
+					$update['post_content'] = $translated;
+					$has_changes            = true;
+				}
+			}
+
+			// ── Translate excerpt ────────────────────────────────────────────
+
+			if ( ! empty( $settings['translate_excerpt'] )
+				&& '' !== trim( $source_post->post_excerpt )
+				&& post_type_supports( $source_post->post_type, 'excerpt' )
+			) {
+				$translated = $this->translator->translate( $source_post->post_excerpt, $target_locale );
+				if ( ! is_wp_error( $translated ) && '' !== $translated ) {
+					$update['post_excerpt'] = $translated;
+					$has_changes            = true;
+				}
+			}
+
+			if ( $has_changes ) {
+				// Already on the remote site — no switch_to_blog() needed.
+				wp_update_post( wp_slash( $update ) );
+			}
+		}
+	}
+}