<?php

namespace App\Temporal\Shared;

use Temporal\Exception\Failure\ApplicationFailure;

class FaultSimulator
{
    public static function maybeApply(array $config, string $activityName = ''): void
    {
        if (empty($config)) {
            return;
        }

        // 1. Base latency
        $latencyMs = $config['latencyMs'] ?? 0;
        if ($latencyMs > 0) {
            usleep($latencyMs * 1000);
        }

        // 2. Rate limiting — throw ApplicationFailure with nextRetryDelay
        $rl = $config['rateLimiting'] ?? [];
        if (!empty($rl['enabled']) && ($rl['hitChance'] ?? 0) > 0) {
            if (rand(1, 100) <= $rl['hitChance']) {
                $retryAfterMs = $rl['retryAfterMs'] ?? 2000;
                $retrySeconds = (int) ceil($retryAfterMs / 1000);

                throw new ApplicationFailure(
                    "Rate limited (429) on {$activityName}",
                    'RateLimited',
                    false, // nonRetryable = false → Temporal WILL retry
                    null,
                    null,
                    \DateInterval::createFromDateString("{$retrySeconds} seconds"),
                );
            }
        }

        // 3. Random failure — plain RuntimeException (Temporal retries automatically)
        $failureRate = $config['failureRate'] ?? 0;
        if ($failureRate > 0 && rand(1, 100) <= $failureRate) {
            throw new \RuntimeException("Simulated failure on {$activityName}");
        }
    }
}