<?php

declare(strict_types=1);

namespace Steuerkram\Models;

use Steuerkram\Database;

class Supplier
{
    public static function all(): array
    {
        return Database::fetchAll('SELECT * FROM suppliers ORDER BY name');
    }

    public static function find(int $id): array|false
    {
        return Database::fetchOne('SELECT * FROM suppliers WHERE id = ?', [$id]);
    }

    public static function findByName(string $name): array|false
    {
        return Database::fetchOne('SELECT * FROM suppliers WHERE name = ?', [trim($name)]);
    }

    public static function create(string $name): int
    {
        Database::execute('INSERT INTO suppliers (name) VALUES (?)', [trim($name)]);
        return (int)Database::lastInsertId();
    }

    public static function update(int $id, string $name): void
    {
        Database::execute('UPDATE suppliers SET name = ?, updated_at = NOW() WHERE id = ?', [trim($name), $id]);
    }

    public static function delete(int $id): bool
    {
        // Prüfen ob Lieferant noch in Belegen verwendet wird
        $cnt = Database::fetchOne('SELECT COUNT(*) as cnt FROM belege WHERE supplier_id = ?', [$id]);
        if ($cnt && $cnt['cnt'] > 0) {
            return false;
        }
        Database::execute('DELETE FROM suppliers WHERE id = ?', [$id]);
        return true;
    }

    /**
     * Gibt ID eines vorhandenen Lieferanten zurück oder legt ihn neu an.
     */
    public static function findOrCreate(string $name): int
    {
        $name = trim($name);
        if ($name === '') {
            throw new \InvalidArgumentException('Lieferantenname darf nicht leer sein.');
        }
        $existing = self::findByName($name);
        if ($existing) {
            return (int)$existing['id'];
        }
        return self::create($name);
    }
}