backend-php/controllers/CommodityCreateController.php

<?php

namespace Controllers;

use Libs\ResponseLib;
use Models\CommodityModel;
use Psr\Http\Message\ServerRequestInterface;
use Respect\Validation\Validator as val;
use Respect\Validation\Exceptions\ValidationException;

class CommodityCreateController
{
    private CommodityModel $model;

    public function __construct()
    {
        $this->model = new CommodityModel();
    }

    public function __invoke(ServerRequestInterface $request)
    {
        $body = json_decode((string)$request->getBody(), true) ?? [];

        try {
            val::key('name', val::stringType()->notEmpty()->length(1, 255))
                ->key('flag', val::optional(val::stringType()->length(1, 10)), false)
                ->assert($body);
        } catch (ValidationException $e) {
            return ResponseLib::sendFail("Validation failed: " . $e->getFullMessage(), [], "E_VALIDATE")->withStatus(400);
        }

        $name = trim($body['name']);
        $flag = $body['flag'] ?? 'a';

        $created = $this->model->create($name, $flag);

        if (!$created) {
            return ResponseLib::sendFail('Failed to create Commodity', [], 'E_DATABASE')->withStatus(500);
        }

        return ResponseLib::sendOk($created, 'S_CREATED');
    }
}