<?php
/**
 * PHP Version check.
 *
 * @package advanced-analytics
 *
 * @since 4.9.0
 */

declare(strict_types=1);

namespace ADVAN\Checks\Security;

use ADVAN\Checks\Abstract_Check;

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'ADVAN\Checks\Security\PHP_Version_Check' ) ) {
	/**
	 * PHP Version check class.
	 *
	 * @since 4.9.0
	 */
	class PHP_Version_Check extends Abstract_Check {

		/**
		 * Check identifier (slug).
		 *
		 * @var string Check identifier (slug).
		 *
		 * @since 4.9.0
		 */
		protected static string $id = 'php-version';

		/**
		 * Check category.
		 *
		 * @var string Check category.
		 *
		 * @since 4.9.0
		 */
		protected static string $category = 'security';

		/**
		 * Check weight (1-10).
		 *
		 * @var int Check weight (1-10).
		 *
		 * @since 4.9.0
		 */
		protected static int $weight = 9;

		/**
		 * Check title (translatable).
		 *
		 * @return string Check title.
		 *
		 * @since 4.9.0
		 */
		public static function get_title(): string {
			return __( 'PHP Version', '0-day-analytics' );
		}

		/**
		 * Check description (translatable).
		 *
		 * @return string Check description.
		 *
		 * @since 4.9.0
		 */
		public static function get_description(): string {
			return __( 'Checks if your PHP version is current and receiving security updates.', '0-day-analytics' );
		}

		/**
		 * PHP version EOL dates.
		 *
		 * @var array PHP version end-of-life dates.
		 *
		 * @since 4.9.0
		 */
		private static $eol_dates = array(
			'7.4' => '2022-11-28',
			'8.0' => '2023-11-26',
			'8.1' => '2024-11-25',
			'8.2' => '2025-12-08',
			'8.3' => '2026-11-23',
			'8.4' => '2027-11-23',
		);

		/**
		 * Run the check.
		 *
		 * @return array Check result.
		 *
		 * @since 4.9.0
		 */
		public static function run(): array {
			$current_version = PHP_VERSION;
			$major_minor     = PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION;

			$details = array(
				'current_version' => $current_version,
				'recommended'     => '8.2+',
			);

			// Check if version is end of life.
			$is_eol      = false;
			$eol_date    = null;
			$days_to_eol = null;

			if ( isset( self::$eol_dates[ $major_minor ] ) ) {
				$eol_date = self::$eol_dates[ $major_minor ];
				$eol_time = strtotime( $eol_date );

				// Validate strtotime result before using it.
				if ( false !== $eol_time && $eol_time > 0 ) {
					$is_eol      = ( time() > $eol_time );
					$days_to_eol = (int) floor( ( $eol_time - time() ) / DAY_IN_SECONDS );

					$details['eol_date']    = $eol_date;
					$details['days_to_eol'] = $days_to_eol;
				}
			}

			// PHP 7.x is end of life.
			if ( version_compare( $current_version, '8.0', '<' ) ) {
				return static::fail(
					'critical',
					sprintf(
					/* translators: %s: PHP version */
						__( 'Your site is running PHP %s, which no longer receives security updates. This makes your site vulnerable to known security issues that will never be fixed.', '0-day-analytics' ),
						$current_version
					),
					__( 'Contact your hosting provider to upgrade to PHP 8.2 or higher. Most modern WordPress plugins and themes work well with PHP 8.2.', '0-day-analytics' ),
					$details
				);
			}

			// PHP 8.0 is end of life.
			if ( version_compare( $current_version, '8.1', '<' ) ) {
				return static::fail(
					'high',
					sprintf(
					/* translators: %s: PHP version */
						__( 'Your site is running PHP %s, which no longer receives security updates as of November 2023.', '0-day-analytics' ),
						$current_version
					),
					__( 'Contact your hosting provider to upgrade to PHP 8.2 or higher for better security and performance.', '0-day-analytics' ),
					$details
				);
			}

			// PHP 8.1 is approaching end of life.
			if ( version_compare( $current_version, '8.2', '<' ) ) {
				if ( $is_eol ) {
					return static::fail(
						'high',
						sprintf(
						/* translators: %s: PHP version */
							__( 'Your site is running PHP %s, which no longer receives security updates.', '0-day-analytics' ),
							$current_version
						),
						__( 'Contact your hosting provider to upgrade to PHP 8.2 or higher.', '0-day-analytics' ),
						$details
					);
				}

				return static::warning(
					sprintf(
					/* translators: 1: PHP version, 2: number of days */
						__( 'Your site is running PHP %1$s. Security support ends in %2$d days. Consider upgrading to PHP 8.2 or higher.', '0-day-analytics' ),
						$current_version,
						$days_to_eol
					),
					__( 'Contact your hosting provider to upgrade to PHP 8.2 or higher for better security and performance.', '0-day-analytics' ),
					$details
				);
			}

			// PHP 8.2+ is good.
			return static::pass(
				sprintf(
				/* translators: %s: PHP version */
					__( 'Your site is running PHP %s, which is a current version receiving security updates.', '0-day-analytics' ),
					$current_version
				),
				$details
			);
		}
	}
}