<?php

declare(strict_types=1);

final class PublicPageService
{
    private const RESERVED = [
        'site','animaux','adoption','presentation','dons','contact','mentions-legales','confidentialite',
        'logo-association','login','logout','setup','dashboard','statistics','agenda','directory','settings','admin',
        'accounting','inventory','care-round','animal','litter','documents','media','assets','api',
    ];

    public static function all(bool $enabledOnly = false): array
    {
        $sql = 'SELECT * FROM public_site_pages' . ($enabledOnly ? ' WHERE enabled=1' : '') .
            ' ORDER BY sort_order,id';
        return DB::pdo()->query($sql)->fetchAll(PDO::FETCH_ASSOC);
    }

    public static function findBySlug(string $slug, bool $enabledOnly = true): ?array
    {
        $slug = self::normalizeSlug($slug);
        if ($slug === '') return null;
        $stmt = DB::pdo()->prepare(
            'SELECT * FROM public_site_pages WHERE slug=:slug' . ($enabledOnly ? ' AND enabled=1' : '') . ' LIMIT 1',
        );
        $stmt->execute([':slug' => $slug]);
        return $stmt->fetch(PDO::FETCH_ASSOC) ?: null;
    }

    public static function saveAll(array $pages): void
    {
        $db = DB::pdo();
        $pages = array_values(array_filter($pages, 'is_array'));
        usort($pages, static fn (array $a, array $b): int => (int) ($a['position'] ?? 0) <=> (int) ($b['position'] ?? 0));
        $seenSlugs = [];
        $position = 0;
        foreach ($pages as $page) {
            if (!is_array($page)) continue;
            $id = max(0, (int) ($page['id'] ?? 0));
            if (!empty($page['delete'])) {
                if ($id > 0) $db->prepare('DELETE FROM public_site_pages WHERE id=?')->execute([$id]);
                continue;
            }
            $title = mb_substr(trim((string) ($page['title'] ?? '')), 0, 150);
            $slug = self::normalizeSlug((string) ($page['slug'] ?? ''));
            if ($slug === '') $slug = self::normalizeSlug($title);
            if ($title === '' && $slug === '' && trim((string) ($page['content'] ?? '')) === '') continue;
            if ($title === '' || $slug === '' || in_array($slug, self::RESERVED, true)) {
                throw new InvalidArgumentException(t('public_site.page_invalid'));
            }
            if (isset($seenSlugs[$slug])) throw new InvalidArgumentException(t('public_site.page_slug_duplicate'));
            $seenSlugs[$slug] = true;
            $duplicate = $db->prepare('SELECT id FROM public_site_pages WHERE slug=:slug AND id<>:id LIMIT 1');
            $duplicate->execute([':slug' => $slug, ':id' => $id]);
            if ($duplicate->fetchColumn()) throw new InvalidArgumentException(t('public_site.page_slug_duplicate'));
            $content = trim((string) ($page['content'] ?? ''));
            $enabled = !empty($page['enabled']) ? 1 : 0;
            if ($id > 0) {
                $check = $db->prepare('SELECT 1 FROM public_site_pages WHERE id=?');
                $check->execute([$id]);
                if (!$check->fetchColumn()) throw new InvalidArgumentException(t('public_site.page_invalid'));
                $stmt = $db->prepare('UPDATE public_site_pages SET slug=:slug,title=:title,content=:content,enabled=:enabled,sort_order=:sort,updated_at=CURRENT_TIMESTAMP WHERE id=:id');
                $stmt->execute([':slug'=>$slug,':title'=>$title,':content'=>$content,':enabled'=>$enabled,':sort'=>$position,':id'=>$id]);
            } else {
                $stmt = $db->prepare('INSERT INTO public_site_pages(slug,title,content,enabled,sort_order) VALUES(:slug,:title,:content,:enabled,:sort)');
                $stmt->execute([':slug'=>$slug,':title'=>$title,':content'=>$content,':enabled'=>$enabled,':sort'=>$position]);
            }
            $position++;
        }
    }

    public static function normalizeSlug(string $value): string
    {
        $value = mb_strtolower(trim($value), 'UTF-8');
        $ascii = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $value);
        $value = $ascii === false ? $value : $ascii;
        $value = preg_replace('/[^a-z0-9]+/', '-', strtolower($value)) ?? '';
        return mb_substr(trim($value, '-'), 0, 80);
    }
}