<?php

declare(strict_types=1);

abstract class Controller
{
    protected Base $f3;

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

    protected function render(string $view, array $data = [], int $ttl = 0): void
    {
        $this->ensureCsrf();
        $user = $this->user();
        $flash = array_key_exists('flash', $data) ? $data['flash'] : $this->pullFlash();

        $this->f3->expire($user ? 0 : $ttl);
        $this->f3->mset($data + [
            'view' => $view,
            'flash' => is_array($flash) ? $flash : [],
            'currentUser' => $user,
            'adminMode' => false,
            'metaDescription' => null,
            'CSRF_TOKEN' => (string) $this->f3->get('SESSION.csrf_token'),
        ]);

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

    protected function user(): ?array
    {
        if (!$this->f3->exists('ctx.user_loaded')) {
            $id = (int) ($this->f3->get('SESSION.user_id') ?: 0);
            $this->f3->set('currentUser', $id > 0 ? (new User())->findPublic($id) : null);
            $this->f3->set('ctx.user_loaded', true);
        }

        return $this->f3->get('currentUser');
    }

    protected function requireAuth(): void
    {
        if ($this->user()) {
            return;
        }

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

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

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

        $this->f3->error(400);
    }

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

    protected function rotateCsrf(): void
    {
        $this->f3->clear('SESSION.csrf_token');
        $this->ensureCsrf();
    }

    private function ensureCsrf(): void
    {
        if ($this->f3->exists('SESSION.csrf_token')) {
            return;
        }

        $seed = trim((string) ($this->f3->get('CSRF') ?: ''));
        $this->f3->set('SESSION.csrf_token', $seed !== '' ? $seed : bin2hex(random_bytes(16)));
    }

    private function pullFlash(): array
    {
        return $this->f3->pull('SESSION.flash') ?: [];
    }
}