<?php

declare(strict_types=1);

final class Ids
{
    public static function validRna(string $value): bool
    {
        $value = strtoupper(preg_replace('/\s+/', '', trim($value)) ?? '');
        return $value === '' || preg_match('/^W[0-9]{9}$/', $value) === 1;
    }

    public static function validSiret(string $value): bool
    {
        $digits = preg_replace('/\D+/', '', trim($value)) ?? '';
        if ($digits === '') {
            return true;
        }
        if (strlen($digits) !== 14) {
            return false;
        }
        $sum = 0;
        foreach (str_split($digits) as $index => $digit) {
            $number = (int) $digit * ($index % 2 === 0 ? 2 : 1);
            $sum += $number > 9 ? $number - 9 : $number;
        }
        return $sum % 10 === 0;
    }

    public static function slugifyUpper(string $s): string
    {
        $s = trim($s);
        if ($s === '') {
            return 'SANS-NOM';
        }

        // translit: accents -> ascii (si dispo)
        $t = @iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $s);
        if ($t !== false) {
            $s = $t;
        }

        $s = strtoupper($s);
        $s = preg_replace('/[^A-Z0-9]+/', '-', $s) ?? $s;
        $s = trim($s, '-');

        return $s !== '' ? $s : 'SANS-NOM';
    }

    public static function nextAnimalCode(string $name, ?int $year = null): string
    {
        $year = $year ?? (int) date('Y');
        $slug = self::slugifyUpper($name);

        $db = DB::pdo();
        $stmt = $db->prepare(
            'SELECT internal_code FROM animals WHERE internal_code LIKE :p ORDER BY internal_code DESC LIMIT 1',
        );
        $stmt->execute([':p' => $year . '-%']);
        $last = (string) ($stmt->fetchColumn() ?: '');

        $n = 1;
        if ($last !== '') {
            // format attendu: YYYY-NNN-...
            $parts = explode('-', $last);
            if (count($parts) >= 2 && ctype_digit($parts[1])) {
                $n = (int) $parts[1] + 1;
            }
        }

        return sprintf('%d-%03d-%s', $year, $n, $slug);
    }
}