<?php

declare(strict_types=1);

abstract class BaseController
{
    protected Base $f3;
    protected DB\SQL $db;

    public function __construct()
    {
        $this->f3 = Base::instance();
        $this->db = $this->f3->get('DB');
    }

    protected function render(string $view, array $data = []): void
    {
        $this->f3->mset($data + [
            'view'        => $view,
            'currentUser' => $this->currentUser(),
            'flash'       => $this->pullFlash(),
            'csrfToken'   => $this->csrfToken(),
        ]);

        echo Template::instance()->render('layout.html');
    }

    protected function currentUser(): ?array
    {
        $userId = (int) ($this->f3->get('SESSION.user_id') ?? 0);
        return $userId > 0 ? (new User($this->db))->findById($userId) : null;
    }

    protected function requireAuth(): void
    {
        if ($this->currentUser() !== null) {
            return;
        }

        $this->flash('error', 'Connecte-toi pour continuer.');
        $this->f3->reroute($this->f3->alias('login'));
    }

    protected function csrfToken(): string
    {
        // Génère un token CSRF et le stocke en session au premier appel.
        $token = (string) ($this->f3->get('SESSION.csrf_token') ?? '');
        if ($token === '') {
            $token = bin2hex(random_bytes(32));
            $this->f3->set('SESSION.csrf_token', $token);
        }

        return $token;
    }

    protected function verifyCsrf(): void
    {
        $submitted = (string) ($this->f3->get('POST.csrf_token') ?? '');
        $expected  = (string) ($this->f3->get('SESSION.csrf_token') ?? '');

        if ($submitted !== '' && $expected !== '' && hash_equals($expected, $submitted)) {
            return;
        }

        $this->f3->error(400, 'Jeton CSRF invalide.');
    }

    protected function flash(string $type, string $message): void
    {
        $this->f3->set('SESSION.flash', ['type' => $type, 'message' => $message]);
    }

    private function pullFlash(): ?array
    {
        $flash = $this->f3->get('SESSION.flash');
        $this->f3->clear('SESSION.flash');
        return is_array($flash) ? $flash : null;
    }
}