<?php

declare(strict_types=1);

namespace ServerManager\Controllers;

use ServerManager\Core\App;
use ServerManager\Core\Database;
use ServerManager\Core\Session;
use ServerManager\Models\Server;
use ServerManager\Models\Notification;
use ServerManager\Services\MonitoringService;
use ServerManager\Services\AuditService;

class DashboardController
{
    private \ServerManager\Core\View $view;
    private MonitoringService $monitoringService;
    private AuditService $auditService;

    public function __construct()
    {
        $this->view = App::getInstance()->getView();
        $this->monitoringService = new MonitoringService();
        $this->auditService = new AuditService();
    }

    public function landing(): void
    {
        if (Session::has('user_id')) {
            $this->view->redirect('/dashboard');
        }

        $stats = [];
        try {
            $db = Database::getInstance();
            $stats['servers'] = $db->fetch('SELECT COUNT(*) as count FROM servers')['count'] ?? 0;
            $stats['users'] = $db->fetch('SELECT COUNT(*) as count FROM users')['count'] ?? 0;
            $stats['online_servers'] = $db->fetch("SELECT COUNT(*) as count FROM servers WHERE current_status = 'online'")['count'] ?? 0;
        } catch (\Throwable) {
            $stats = ['servers' => 0, 'users' => 0, 'online_servers' => 0];
        }

        $this->view->setLayout('auth')->display('pages.landing', [
            'title' => 'ServerManager - Linux Server Management Platform',
            'stats' => $stats,
        ]);
    }

    public function index(): void
    {
        $serverModel = new Server();
        $userId = (int) Session::get('user_id');

        $accessibleIds = $serverModel->getAccessibleServerIds($userId);
        $stats = $this->monitoringService->getDashboardStats($accessibleIds);
        $servers = !empty($accessibleIds) ? array_values(array_filter($serverModel->findAll(true), function ($s) use ($accessibleIds) {
            return in_array((int) $s['id'], $accessibleIds, true);
        })) : [];

        $aggregatedMetrics = $this->monitoringService->getAggregatedHistoricalMetrics($accessibleIds ?? []);

        $recentActivity = $this->auditService->getRecentActivity(10, $userId);

        $this->view->display('dashboard.index', [
            'title' => 'Dashboard - ServerManager',
            'stats' => $stats,
            'servers' => $servers,
            'aggregatedMetrics' => $aggregatedMetrics,
            'recentActivity' => $recentActivity,
        ]);
    }

    public function stats(): void
    {
        $serverModel = new Server();
        $accessibleIds = $serverModel->getAccessibleServerIds((int) Session::get('user_id'));
        $stats = $this->monitoringService->getDashboardStats($accessibleIds);

        $this->view->json([
            'success' => true,
            'data' => $stats,
        ]);
    }

    public function refreshMetrics(): void
    {
        $this->monitoringService->collectAllMetrics();

        $this->view->json([
            'success' => true,
            'message' => 'Metrics refreshed',
        ]);
    }

    public function chartData(): void
    {
        $serverModel = new Server();
        $accessibleIds = $serverModel->getAccessibleServerIds((int) Session::get('user_id'));
        $data = $this->monitoringService->getAggregatedHistoricalMetrics($accessibleIds ?? []);

        $this->view->json([
            'success' => true,
            'data' => $data,
        ]);
    }

    public function privacy(): void
    {
        $db = Database::getInstance();
        $row = $db->fetch('SELECT `value` FROM app_config WHERE `key` = ?', ['privacy_policy']);
        $content = $row ? $row['value'] : '';

        $this->view->setLayout('auth')->display('pages.privacy', [
            'title' => 'Privacy Policy - ServerManager',
            'content' => $content,
        ]);
    }

    public function terms(): void
    {
        $db = Database::getInstance();
        $row = $db->fetch('SELECT `value` FROM app_config WHERE `key` = ?', ['terms_conditions']);
        $content = $row ? $row['value'] : '';

        $this->view->setLayout('auth')->display('pages.terms', [
            'title' => 'Terms & Conditions - ServerManager',
            'content' => $content,
        ]);
    }

    public function notifications(): void
    {
        $userId = (int) Session::get('user_id');
        $page = (int) ($_GET['page'] ?? 1);
        $perPage = 20;

        $notificationModel = new Notification();
        $result = $notificationModel->getForUser($userId, $page, $perPage);
        $unreadCount = $notificationModel->getUnreadCount($userId);

        $this->view->display('notifications.index', [
            'title' => 'Notifications - ServerManager',
            'notifications' => $result['data'],
            'pagination' => $result,
            'unreadCount' => $unreadCount,
        ]);
    }
}