<?php

namespace App\Controllers;

use App\Core\Auth;
use App\Core\Csrf;
use App\Core\Database;
use App\Core\Response;
use App\Core\Session;
use App\Core\View;
use App\Services\AuditService;
use App\Services\SetupService;
use App\Services\TenantRegistrationService;
use RuntimeException;

final class PlatformController
{
    public function __construct(
        private readonly string $rootPath,
        private readonly array $config,
        private readonly Database $database,
        private readonly View $view,
        private readonly Session $session,
        private readonly Csrf $csrf
    ) {
    }

    public function home(): void
    {
        $setup = new SetupService($this->rootPath);
        $stats = null;

        if ($setup->isInstalled() && $this->database->isConfigured()) {
            try {
                $pdo = $this->database->pdo();
                $stats = [
                    'tenants' => (int) $pdo->query('SELECT COUNT(*) FROM tenants')->fetchColumn(),
                    'members' => (int) $pdo->query('SELECT COUNT(*) FROM members')->fetchColumn(),
                    'events' => (int) $pdo->query('SELECT COUNT(*) FROM consumption_events')->fetchColumn(),
                ];
            } catch (\Throwable) {
                $stats = null;
            }
        }

        $this->view->render('home/index', [
            'title' => 'Kaffeekasse fuer Teams, Vereine und Coworking',
            'setupComplete' => $setup->isInstalled(),
            'stats' => $stats,
        ]);
    }

    public function installForm(): void
    {
        $setup = new SetupService($this->rootPath);

        if ($setup->isInstalled()) {
            Response::redirect('/admin/login');
        }

        $this->view->render('install/index', [
            'title' => 'Installation',
        ]);
    }

    public function installSubmit(): void
    {
        $this->assertCsrf();

        $setup = new SetupService($this->rootPath);

        try {
            $setup->install($_POST);
            $this->session->flash('success', 'Die Installation wurde abgeschlossen. Jetzt kannst du dich als Plattform-Admin anmelden.');
            Response::redirect('/admin/login');
        } catch (\Throwable $throwable) {
            remember_old_input($_POST);
            $this->session->flash('error', $throwable->getMessage());
            Response::redirect('/install');
        }
    }

    public function registerForm(): void
    {
        if (!(new SetupService($this->rootPath))->isInstalled()) {
            Response::redirect('/install');
        }

        $this->view->render('home/register', [
            'title' => 'Mandant registrieren',
        ]);
    }

    public function registerSubmit(): void
    {
        $this->assertCsrf();

        try {
            $pdo = $this->database->pdo();
            $audit = new AuditService($pdo);
            $service = new TenantRegistrationService($pdo, $audit);
            $slug = $service->register($_POST);
            $this->session->flash('success', 'Dein Mandant wurde angelegt. Du kannst dich jetzt anmelden.');
            Response::redirect('/t/' . rawurlencode($slug) . '/login');
        } catch (\Throwable $throwable) {
            remember_old_input($_POST);
            $this->session->flash('error', $throwable->getMessage());
            Response::redirect('/register');
        }
    }

    public function adminLoginForm(): void
    {
        $this->view->render('admin/login', [
            'title' => 'Plattform-Login',
        ]);
    }

    public function adminLoginSubmit(): void
    {
        $this->assertCsrf();

        try {
            $pdo = $this->database->pdo();
            $auth = new Auth($pdo, $this->session);
            $audit = new AuditService($pdo);
            $success = $auth->attemptPlatformLogin((string) ($_POST['email'] ?? ''), (string) ($_POST['password'] ?? ''));
            $audit->log(null, null, 'platform.login', 'user', null, $success ? 'success' : 'failure', [
                'email' => mb_strtolower(trim((string) ($_POST['email'] ?? ''))),
            ]);

            if (!$success) {
                throw new RuntimeException('Die Zugangsdaten konnten nicht verifiziert werden.');
            }

            $this->session->flash('success', 'Willkommen im Plattformbereich.');
            Response::redirect('/admin');
        } catch (\Throwable $throwable) {
            remember_old_input($_POST);
            $this->session->flash('error', $throwable->getMessage());
            Response::redirect('/admin/login');
        }
    }

    public function adminDashboard(): void
    {
        $pdo = $this->database->pdo();
        $auth = new Auth($pdo, $this->session);

        if (!$auth->checkPlatformAdmin()) {
            $this->session->flash('error', 'Bitte zuerst als Plattform-Admin anmelden.');
            Response::redirect('/admin/login');
        }

        $tenants = $pdo->query(
            'SELECT t.*,
                    COUNT(DISTINCT m.id) AS member_count,
                    COUNT(DISTINCT p.id) AS product_count
             FROM tenants t
             LEFT JOIN members m ON m.tenant_id = t.id
             LEFT JOIN products p ON p.tenant_id = t.id
             GROUP BY t.id
             ORDER BY t.created_at DESC'
        )->fetchAll();

        $this->view->render('admin/index', [
            'title' => 'Plattform-Dashboard',
            'tenants' => $tenants,
        ]);
    }

    public function adminLogout(): void
    {
        $this->assertCsrf();

        $pdo = $this->database->pdo();
        $auth = new Auth($pdo, $this->session);
        $auth->logout();
        $this->session->flash('success', 'Du wurdest aus dem Plattformbereich abgemeldet.');
        Response::redirect('/admin/login');
    }

    private function assertCsrf(): void
    {
        if (!request_origin_matches_host() || !$this->csrf->validate($_POST['_token'] ?? null)) {
            throw new RuntimeException('Die Anfrage konnte nicht bestaetigt werden. Bitte erneut versuchen.');
        }
    }
}