<?php

namespace App\Services;

use App\Models\Notification;

class NotificationService
{
    private Notification $notificationModel;

    public function __construct()
    {
        $this->notificationModel = new Notification();
    }

    /**
     * Create a domain expiring notification
     */
    public function notifyDomainExpiring(int $userId, string $domainName, int $daysLeft, int $domainId): void
    {
        $this->notificationModel->createNotification(
            $userId,
            'domain_expiring',
            'Domain Expiring Soon',
            "{$domainName} expires in {$daysLeft} day" . ($daysLeft > 1 ? 's' : ''),
            $domainId
        );
    }

    /**
     * Create a domain expired notification
     */
    public function notifyDomainExpired(int $userId, string $domainName, int $domainId): void
    {
        $this->notificationModel->createNotification(
            $userId,
            'domain_expired',
            'Domain Expired',
            "{$domainName} has expired - renew immediately",
            $domainId
        );
    }

    /**
     * Create a domain WHOIS updated notification
     */
    public function notifyDomainUpdated(int $userId, string $domainName, int $domainId, string $changes = ''): void
    {
        $message = !empty($changes) ? 
            "{$domainName} - {$changes}" : 
            "{$domainName} WHOIS data updated";
            
        $this->notificationModel->createNotification(
            $userId,
            'domain_updated',
            'Domain WHOIS Updated',
            $message,
            $domainId
        );
    }

    /**
     * Create a WHOIS lookup failed notification
     */
    public function notifyWhoisFailed(int $userId, string $domainName, int $domainId, string $reason = ''): void
    {
        $message = !empty($reason) ? 
            "Could not refresh {$domainName} - {$reason}" : 
            "Could not refresh {$domainName}";
            
        $this->notificationModel->createNotification(
            $userId,
            'whois_failed',
            'WHOIS Lookup Failed',
            $message,
            $domainId
        );
    }

    /**
     * Create a new login notification
     */
    public function notifyNewLogin(int $userId, string $location, string $ipAddress): void
    {
        $this->notificationModel->createNotification(
            $userId,
            'session_new',
            'New Login Detected',
            "Login from {$location} ({$ipAddress})",
            null
        );
    }

    /**
     * Create welcome notification for new users/fresh install
     */
    public function notifyWelcome(int $userId, string $username): void
    {
        $this->notificationModel->createNotification(
            $userId,
            'system_welcome',
            'Welcome to Domain Monitor! 🎉',
            "Hi {$username}! Your account is ready. Start by adding your first domain to monitor.",
            null
        );
    }

    /**
     * Create system upgrade notification for admins
     */
    public function notifySystemUpgrade(int $userId, string $fromVersion, string $toVersion, int $migrationsCount): void
    {
        $this->notificationModel->createNotification(
            $userId,
            'system_upgrade',
            'System Upgraded Successfully',
            "Domain Monitor upgraded from v{$fromVersion} to v{$toVersion} ({$migrationsCount} migration" . ($migrationsCount > 1 ? 's' : '') . " applied)",
            null
        );
    }

    /**
     * Notify all admins about system upgrade
     */
    public function notifyAdminsUpgrade(string $fromVersion, string $toVersion, int $migrationsCount): void
    {
        try {
            $pdo = \Core\Database::getConnection();
            $stmt = $pdo->query("SELECT id FROM users WHERE role = 'admin'");
            $admins = $stmt->fetchAll(\PDO::FETCH_ASSOC);
            
            foreach ($admins as $admin) {
                $this->notifySystemUpgrade($admin['id'], $fromVersion, $toVersion, $migrationsCount);
            }
        } catch (\Exception $e) {
            error_log("Failed to notify admins about upgrade: " . $e->getMessage());
        }
    }

    /**
     * Delete old read notifications (cleanup)
     */
    public function cleanOldNotifications(int $daysOld = 30): void
    {
        try {
            $pdo = \Core\Database::getConnection();
            $stmt = $pdo->prepare(
                "DELETE FROM user_notifications 
                 WHERE is_read = 1 
                 AND read_at < DATE_SUB(NOW(), INTERVAL ? DAY)"
            );
            $stmt->execute([$daysOld]);
        } catch (\Exception $e) {
            error_log("Failed to clean old notifications: " . $e->getMessage());
        }
    }
}