<?php
namespace QWSpeedCache\Tools;

defined( 'ABSPATH' ) || exit;

/**
 * PHP OPcache status and flush.
 */
class OpCache {

	public function __construct() {
		add_action( 'admin_post_qwsc_opcache_flush', array( $this, 'flush' ) );
	}

	/**
	 * @return array{enabled:bool,memory_usage?:array,statistics?:array,message?:string}
	 */
	public static function status() {
		if ( ! function_exists( 'opcache_get_status' ) ) {
			return array( 'enabled' => false, 'message' => 'OPcache extension not available' );
		}
		$st = @opcache_get_status( false ); // phpcs:ignore WordPress.PHP.NoSilencedErrors
		if ( ! is_array( $st ) ) {
			return array( 'enabled' => false, 'message' => 'OPcache disabled or restricted' );
		}
		return array(
			'enabled'      => ! empty( $st['opcache_enabled'] ),
			'memory_usage' => isset( $st['memory_usage'] ) ? $st['memory_usage'] : array(),
			'statistics'   => isset( $st['opcache_statistics'] ) ? $st['opcache_statistics'] : array(),
		);
	}

	/**
	 * @return bool
	 */
	public static function reset() {
		if ( function_exists( 'opcache_reset' ) ) {
			return (bool) @opcache_reset(); // phpcs:ignore WordPress.PHP.NoSilencedErrors
		}
		return false;
	}

	public function flush() {
		check_admin_referer( 'qwsc_opcache_flush' );
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'Unauthorized', 'qw-optimize' ), '', array( 'response' => 403 ) );
		}
		$ok = self::reset();
		wp_safe_redirect(
			add_query_arg(
				array(
					'page'          => 'qw-speed-cache-tools',
					'opcache_flush' => $ok ? '1' : '0',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}
}