<?php
/**
 * OPcache handler.
 *
 * @package SpeedNest
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Class WPSCO_OPcache
 *
 * Inspects and safely resets PHP OPcache.
 */
class WPSCO_OPcache {

    /**
     * Check if OPcache is active.
     *
     * @return bool
     */
    public static function is_enabled() {
        return function_exists( 'opcache_get_status' ) && (bool) ini_get( 'opcache.enable' );
    }

    /**
     * Check if reset is permitted on this host.
     *
     * @return bool
     */
    public static function can_reset() {
        if ( ! function_exists( 'opcache_reset' ) ) {
            return false;
        }

        $disabled = explode( ',', ini_get( 'disable_functions' ) );
        $disabled = array_map( 'trim', $disabled );

        return ! in_array( 'opcache_reset', $disabled, true );
    }

    /**
     * Get detailed OPcache status.
     *
     * @return array
     */
    public static function get_status() {
        if ( ! self::is_enabled() ) {
            return array(
                'enabled'      => false,
                'can_reset'    => false,
                'memory_used'  => 'N/A',
                'memory_free'  => 'N/A',
                'hit_rate'     => 'N/A',
                'cached_files' => 0,
            );
        }

        $data = @opcache_get_status( false );
        if ( ! is_array( $data ) ) {
            return array(
                'enabled'      => true,
                'can_reset'    => self::can_reset(),
                'memory_used'  => 'Restricted',
                'memory_free'  => 'Restricted',
                'hit_rate'     => 'Restricted',
                'cached_files' => 0,
            );
        }

        return array(
            'enabled'      => true,
            'can_reset'    => self::can_reset(),
            'memory_used'  => isset( $data['memory_usage']['used_memory'] ) ? wpsco_format_size( $data['memory_usage']['used_memory'] ) : 'N/A',
            'memory_free'  => isset( $data['memory_usage']['free_memory'] ) ? wpsco_format_size( $data['memory_usage']['free_memory'] ) : 'N/A',
            'hit_rate'     => isset( $data['opcache_statistics']['opcache_hit_rate'] ) ? round( $data['opcache_statistics']['opcache_hit_rate'], 1 ) . '%' : 'N/A',
            'cached_files' => $data['opcache_statistics']['num_cached_scripts'] ?? 0,
        );
    }

    /**
     * Reset OPcache.
     *
     * @return array
     */
    public static function reset() {
        if ( ! self::is_enabled() ) {
            return array(
                'status'  => 'not_available',
                'message' => __( 'PHP OPcache is not enabled on this server.', 'speednest' ),
            );
        }

        if ( ! self::can_reset() ) {
            return array(
                'status'  => 'disabled_function',
                'message' => __( 'opcache_reset() is disabled by hosting provider in php.ini.', 'speednest' ),
            );
        }

        $success = @opcache_reset();

        return array(
            'status'  => $success ? 'cleared' : 'error',
            'message' => $success ? __( 'PHP OPcache reset successfully.', 'speednest' ) : __( 'Failed to reset PHP OPcache.', 'speednest' ),
        );
    }
}