VideoPress: improve asset enqueuing for P2 and Classic themes (#33042)

* [not verified] re-add asset enqueueing logic with extra care for P2s

* [not verified] changelog

projects/packages/videopress/changelog/change-vp-asset-enqueuing

@@ -0,0 +1,4 @@
+Significance: minor
+Type: changed
+
+Add VideoPress assets enqueuing logic after the revert c9fa94de7886af75b65b8c75e642fb529144eb31 (reverted d5ca47d8de53df832e67ac8b9d6bda3663c3e8df). This time P2s should not be affected.

projects/packages/videopress/src/class-initializer.php

@@ -348,6 +348,37 @@ public static function register_videopress_video_block() {
 			return;
 		}
 
+		// check current theme
+		$is_block_theme = wp_get_theme()->is_block_theme();
+
+		// Check if the site is a P2 site
+		$is_p2_site = function_exists( '\WPForTeams\is_wpforteams_site' ) && \WPForTeams\is_wpforteams_site( get_current_blog_id() );
+
+		// for non block themes frontend, we defer the enqueuing to the frontend, so we're able to tell if we need the assets
+		// If site is p2, load the assets in the frontend
+		if ( ! $is_block_theme && ! is_admin() && ! $is_p2_site ) {
+			add_action(
+				'wp_enqueue_scripts',
+				function () use ( $videopress_video_metadata_file ) {
+					$post_content = get_the_content();
+
+					if ( ! has_block( 'videopress/video', $post_content ) && ! has_shortcode( $post_content, 'videopress' ) ) {
+						return;
+					}
+					self::enqueue_block_assets( $videopress_video_metadata_file );
+				}
+			);
+			return;
+		}
+		self::enqueue_block_assets( $videopress_video_metadata_file );
+	}
+
+	/**
+	 * Enqueue scripts used by the VideoPress video block and register block type.
+	 *
+	 * @param string $videopress_video_metadata_file Path to the block metadata file.
+	 */
+	public static function enqueue_block_assets( $videopress_video_metadata_file ) {
 		// Register script used by the VideoPress video block in the editor.
 		Assets::register_script(
 			self::JETPACK_VIDEOPRESS_VIDEO_HANDLER,