<?php
require_once __DIR__ . '/../../core/Controller.php';
require_once __DIR__ . '/../services/HealthService.php';
class AdminController extends Controller {
    // Auth-Check
    public function __construct() {
        if (session_status() === PHP_SESSION_NONE) { session_start(); }
        if (!isset($_SESSION['is_admin']) || $_SESSION['is_admin'] !== true) {
            header('Location: ' . Config::get('BASE_URL', '/'));
            exit;
        }
    }
    // Dashboard
    public function index() {
        $report = HealthService::getHealthReport();
        $this->view('admin/dashboard', [
            'title'  => 'Admin Dashboard',
            'health' => $report
        ]);
    }
    // Settings
    public function settings() {
        $this->view('admin/settings', [
            'title' => 'Einstellungen'
        ]);
    }
    // User & Invite Management
    public function users() {
        $userModel = $this->model('User');
        $invitationModel = $this->model('Invitation');
        
        $users = $userModel->getAll();
        $invitations = $invitationModel->getAll();
        $allModules = ModuleService::getAll();
        $activeTab = $_GET['tab'] ?? 'users';

        $this->view('admin/users', [
            'title'       => 'Benutzer- & Zugangsverwaltung',
            'users'       => $users,
            'invitations' => $invitations,
            'allModules'  => $allModules,
            'activeTab'   => $activeTab
        ]);
    }

    // User Form
    public function user_form($id = null) {
        $user = null;
        if ($id) {
            $userModel = $this->model('User');
            $user = $userModel->getById($id);
            if (!$user) {
                Flash::set('Nutzer nicht gefunden.', 'error');
                header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users');
                exit;
            }
        }
        $this->view('admin/user_form', [
            'title'      => $id ? 'Benutzer bearbeiten' : 'Neuen Benutzer anlegen',
            'user'       => $user,
            'allModules' => ModuleService::getAll()
        ]);
    }

    // Save User
    public function user_save() {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users');
            exit;
        }
        try {
            Security::checkCsrf($_POST['csrf_token'] ?? '');
            $id = !empty($_POST['id']) ? (int)$_POST['id'] : null;
            $userModel = $this->model('User');

            if (empty($_POST['name']) || empty($_POST['email'])) {
                throw new Exception("Name und E-Mail sind Pflichtfelder.");
            }

            // Projects from checkboxes
            $projects = isset($_POST['projects']) && is_array($_POST['projects']) ? $_POST['projects'] : [];
            $postData = $_POST;
            $postData['projects'] = $projects;

            $userModel->save($postData, $id);
            Flash::set('Nutzer erfolgreich gespeichert!', 'success');
        } catch (Exception $e) {
            Flash::set($e->getMessage(), 'error');
        }
        header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users');
        exit;
    }

    // Quick toggle user status (Active / Inactive)
    public function user_toggle_status($id) {
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            try {
                Security::checkCsrf($_POST['csrf_token'] ?? '');
                $userModel = $this->model('User');
                $user = $userModel->getById($id);
                if (!$user) {
                    throw new Exception("Nutzer nicht gefunden.");
                }

                $newStatus = ($user['status'] === 'Active') ? 'Inactive' : 'Active';
                $user['status'] = $newStatus;
                $userModel->save($user, $id);

                Flash::set('Status für ' . htmlspecialchars($user['name']) . ' geändert auf: ' . $newStatus, 'success');
            } catch (Exception $e) {
                Flash::set('Fehler: ' . $e->getMessage(), 'error');
            }
        }
        header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users');
        exit;
    }

    // Delete User
    public function user_delete($id) {
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            try {
                Security::checkCsrf($_POST['csrf_token'] ?? '');
                $userModel = $this->model('User');
                $userModel->delete($id);
                Flash::set('Nutzer wurde gelöscht.', 'success');
            } catch (Exception $e) {
                Flash::set('Fehler beim Löschen: ' . $e->getMessage(), 'error');
            }
        }
        header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users');
        exit;
    }

    // Create Invitation Link
    public function invite_create() {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users?tab=invites');
            exit;
        }

        try {
            Security::checkCsrf($_POST['csrf_token'] ?? '');
            $invitationModel = $this->model('Invitation');
            $userModel = $this->model('User');

            $assignedProjects = isset($_POST['projects']) && is_array($_POST['projects']) ? $_POST['projects'] : [];
            $note = trim($_POST['note'] ?? '');
            $maxUses = !empty($_POST['max_uses']) ? max(1, (int)$_POST['max_uses']) : 1;
            $recipientEmail = trim(strtolower($_POST['recipient_email'] ?? ''));
            $sendEmailNow = !empty($_POST['send_email_now']);

            if (!empty($recipientEmail)) {
                if (!filter_var($recipientEmail, FILTER_VALIDATE_EMAIL)) {
                    throw new Exception('Bitte gib eine gültige E-Mail-Adresse an.');
                }
                $existingUser = $userModel->findByEmail($recipientEmail);
                if ($existingUser) {
                    throw new Exception("Ein Benutzer mit der E-Mail '{$recipientEmail}' existiert bereits.");
                }
            }
            
            $expiresAt = null;
            if (!empty($_POST['days_valid']) && (int)$_POST['days_valid'] > 0) {
                $days = (int)$_POST['days_valid'];
                $expiresAt = (new DateTime("+{$days} days"))->format('Y-m-d H:i:s');
            }

            $token = $invitationModel->create($assignedProjects, $note ?: null, $maxUses, $expiresAt, $recipientEmail ?: null);
            $baseUrl = rtrim(Config::get('BASE_URL', 'https://philippurbschat.de/'), '/');
            $inviteUrl = $baseUrl . '/register?token=' . $token;

            $mailSentNotice = '';
            if (!empty($recipientEmail) && $sendEmailNow) {
                require_once __DIR__ . '/../services/MailService.php';
                MailService::sendInvitation($recipientEmail, $token, $assignedProjects, $note ?: null);
                $mailSentNotice = " und E-Mail an {$recipientEmail} gesendet";
            }

            Flash::set('Einladungslink erfolgreich erstellt' . $mailSentNotice . ': ' . $inviteUrl, 'success');
        } catch (Exception $e) {
            Flash::set('Fehler beim Erstellen des Einladungslinks: ' . $e->getMessage(), 'error');
        }

        header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users?tab=invites');
        exit;
    }

    // Resend Invitation Email
    public function invite_resend($id) {
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            try {
                Security::checkCsrf($_POST['csrf_token'] ?? '');
                $invitationModel = $this->model('Invitation');
                $inv = $invitationModel->getById((int)$id);

                if (!$inv) {
                    throw new Exception('Einladung nicht gefunden.');
                }
                if (empty($inv['recipient_email'])) {
                    throw new Exception('Dieser Einladungslink ist keiner konkreten E-Mail-Adresse zugewiesen.');
                }

                require_once __DIR__ . '/../services/MailService.php';
                MailService::sendInvitation($inv['recipient_email'], $inv['token'], $inv['assigned_projects'], $inv['note'] ?? null);

                Flash::set("Einladungs-E-Mail erfolgreich erneut an {$inv['recipient_email']} gesendet.", 'success');
            } catch (Exception $e) {
                Flash::set('Fehler beim Senden der E-Mail: ' . $e->getMessage(), 'error');
            }
        }
        header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users?tab=invites');
        exit;
    }

    // Delete Invitation Link
    public function invite_delete($id) {
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            try {
                Security::checkCsrf($_POST['csrf_token'] ?? '');
                $invitationModel = $this->model('Invitation');
                $invitationModel->delete((int)$id);
                Flash::set('Einladungslink wurde gelöscht.', 'success');
            } catch (Exception $e) {
                Flash::set('Fehler beim Löschen: ' . $e->getMessage(), 'error');
            }
        }
        header('Location: ' . Config::get('BASE_URL', '/') . 'admin/users?tab=invites');
        exit;
    }
}