<?php
declare(strict_types=1);


namespace OneClickFormSync\Queue;

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

/**
 * Calculates next execution intervals and limits for failed entries.
 */
class RetryPolicy
{
    /**
     * Get the configured retry intervals mapping (attempt number -> delay in seconds).
     *
     * @return array
     */
    public function getIntervals(): array
    {
        return apply_filters('oneclickformsync_retry_intervals', [
            1 => 20,      // 20 seconds
            2 => 300,     // 5 minutes
            3 => 900,     // 15 minutes
            4 => 3600,    // 1 hour
            5 => 21600,   // 6 hours
        ]);
    }

    /**
     * Calculate the timestamp for the next retry attempt based on current attempt count.
     *
     * @param int $attempts Number of attempts already made.
     * @return int|null Next timestamp, or null if maximum retries exceeded.
     */
    public function getNextAttemptTimestamp(int $attempts): ?int
    {
        $intervals = $this->getIntervals();

        if ($attempts >= count($intervals)) {
            // Max attempts budget exhausted.
            return null;
        }

        $delay = $intervals[$attempts + 1] ?? 60;
        return current_time('timestamp', true) + $delay;
    }

    /**
     * Check if maximum attempts have been reached.
     *
     * @param int $attempts
     * @return bool
     */
    public function isMaxAttemptsReached(int $attempts): bool
    {
        return $attempts >= count($this->getIntervals());
    }
}