<?php

namespace App\Services\Email;

use Exception;
use App\Services\Session;
use App\Services\Logger;
use App\Services\SecurityService;

/**
 * Email Rate Limiter
 *
 * Handles rate limiting for email sending to prevent abuse.
 *
 * @package App\Services\Email
 */
class EmailRateLimiter
{
    /**
     * @var Logger Logger service
     */
    private Logger $logger;

    /**
     * @var SecurityService Security service
     */
    private SecurityService $securityService;

    /**
     * @var int Maximum emails per hour
     */
    private int $maxEmailsPerHour;

    /**
     * @var string Email log key in session
     */
    private string $emailLogKey = 'email_sent_log';

    /**
     * EmailRateLimiter constructor
     *
     * @param int $maxEmailsPerHour Maximum emails per hour
     */
    public function __construct(int $maxEmailsPerHour = 10)
    {
        $this->logger = new Logger();
        $this->securityService = new SecurityService();
        $this->maxEmailsPerHour = $maxEmailsPerHour;
    }

    /**
     * Check rate limit for email sending
     *
     * @return bool True if under the rate limit
     */
    public function checkRateLimit(): bool
    {
        try {
            $session = new Session();
            $session->start();

            // Get email log from session
            $emailLog = $session->get($this->emailLogKey, []);

            // Clean up old entries (older than 1 hour)
            $now = time();
            $emailLog = array_filter($emailLog, function ($timestamp) use ($now) {
                return ($now - $timestamp) < 3600; // Keep emails from the last hour
            });

            // Count emails sent in the last hour
            $emailCount = count($emailLog);

            // Check if we're over the limit
            if ($emailCount >= $this->maxEmailsPerHour) {
                return false;
            }

            return true;
        } catch (Exception $e) {
            // Log the error
            $this->logger->error('Rate limit check failed', [
                'error' => $e->getMessage()
            ]);

            // If there's an error checking rate limit, be cautious and allow the email
            return true;
        }
    }

    /**
     * Log an email sending attempt
     *
     * @param string|array $to Recipient(s)
     * @param string $subject Email subject
     * @return void
     */
    public function logEmailAttempt(string|array $to, string $subject): void
    {
        try {
            $session = new Session();
            $session->start();

            // Get email log from session
            $emailLog = $session->get($this->emailLogKey, []);

            // Add current timestamp
            $emailLog[] = time();

            // Update session
            $session->set($this->emailLogKey, $emailLog);

            // Log for security monitoring
            $recipient = is_array($to) ? implode(', ', array_keys($to)) : $to;
            $this->securityService->logSecurityEvent(
                'email_sent',
                [
                    'to' => $recipient,
                    'subject' => $subject
                ],
                'info'
            );
        } catch (Exception $e) {
            // Log the error
            $this->logger->error('Failed to log email attempt', [
                'error' => $e->getMessage()
            ]);
        }
    }
}