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wp-content/plugins/jetpack-boost/app/modules/optimizations/lcp/class-optimize-lcp-endpoint.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Modules\Optimizations\Lcp;
+
+use Automattic\Jetpack\WP_JS_Data_Sync\Contracts\Data_Sync_Action;
+use Automattic\Jetpack_Boost\Modules\Modules_Setup;
+
+class Optimize_LCP_Endpoint implements Data_Sync_Action {
+
+	/**
+	 * Handles the optimize LCP action.
+	 *
+	 * @param mixed            $_data    JSON Data passed to the action.
+	 * @param \WP_REST_Request $_request The request object.
+	 */
+	public function handle( $_data, $_request ) {
+		// Check if the module is enabled first.
+		$states = ( new Modules_Setup() )->get_status();
+		if ( ! $states['lcp'] ) {
+			return array(
+				'success' => false,
+				'state'   => array(),
+			);
+		}
+
+		$analyzer = new LCP_Analyzer();
+		$state    = $analyzer->get_state();
+		if ( $state->is_pending() ) {
+			// If the analysis is already in progress, return the current state.
+			return array(
+				'success' => true,
+				'state'   => $state->get(),
+			);
+		}
+
+		$state = $analyzer->start();
+
+		return array(
+			'success' => true,
+			'state'   => $state,
+		);
+	}
+}