<?php

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namespace Elementor\Core\Utils;

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if ( ! defined( 'ABSPATH' ) ) {

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exit; // Exit if accessed directly.

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}

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/**

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* Core A/B Testing utility class

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*

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* Provides A/B testing functionality for Core features.

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* Uses WordPress transients for caching and user-specific variation assignment.

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*/

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class Ab_Test {

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const PREFIX_CACHE_KEY = '_elementor_ab_test_';

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const CACHE_TTL = 90 * DAY_IN_SECONDS;

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/**

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* Get variation for a specific test

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*

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* @param string $test_name The name of the A/B test

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* @param int $user_id Optional user ID, defaults to current user

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* @return int Returns 1 or 2 for variation assignment

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*/

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public static function get_variation( $test_name, $user_id = null ): int {

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if ( null === $user_id ) {

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$user_id = get_current_user_id();

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}

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$variation_id = self::get_variation_id_from_cache( $test_name, $user_id );

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if ( false === $variation_id ) {

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$variation_id = self::get_random_variation();

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self::set_variation_id_from_cache( $test_name, $user_id, $variation_id );

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}

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return absint( $variation_id );

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}

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/**

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* Check if user should see the feature (50% probability)

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*

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* @param string $test_name The name of the A/B test

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* @param int $user_id Optional user ID, defaults to current user

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* @return bool True if user should see the feature

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*/

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public static function should_show_feature( $test_name, $user_id = null ): bool {

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$variation = self::get_variation( $test_name, $user_id );

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return 1 === $variation; // Only variation 1 sees the feature

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}

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/**

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* Get variation ID from cache

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*

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* @param string $test_name The name of the A/B test

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* @param int $user_id User ID

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* @return int|false Variation ID or false if not cached

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*/

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private static function get_variation_id_from_cache( $test_name, $user_id ) {

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$cache_key = self::PREFIX_CACHE_KEY . $test_name . '_' . $user_id;

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return get_transient( $cache_key );

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}

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/**

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* Set variation ID in cache

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*

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* @param string $test_name The name of the A/B test

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* @param int $user_id User ID

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* @param int $variation_id Variation ID to cache

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*/

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private static function set_variation_id_from_cache( $test_name, $user_id, $variation_id ): void {

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$cache_key = self::PREFIX_CACHE_KEY . $test_name . '_' . $user_id;

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set_transient( $cache_key, $variation_id, self::CACHE_TTL );

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}

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/**

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* Generate random variation (1 or 2)

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*

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* @return int Random variation ID

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*/

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private static function get_random_variation(): int {

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return mt_rand( 1, 2 );

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}

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}

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