backend-php/controllers/CommodityUpdateController.php

<?php

namespace Controllers;

use Libs\ResponseLib;
use Models\CommodityModel;
use Psr\Http\Message\ServerRequestInterface;

class CommodityUpdateController
{
    public function __invoke(ServerRequestInterface $request)
    {
        $body = json_decode((string)$request->getBody(), true) ?? [];
        $id = isset($body['commodities_id']) ? (int)$body['commodities_id'] : 0;
        $name = array_key_exists('name', $body) ? trim((string)$body['name']) : null;
        $flag = array_key_exists('flag', $body) ? (string)$body['flag'] : null;

        if ($id <= 0) {
            return ResponseLib::sendFail('Validation failed: invalid commodities_id', [], 'E_VALIDATE')->withStatus(400);
        }
        if ($name === null && $flag === null) {
            return ResponseLib::sendFail('Validation failed: nothing to update', [], 'E_VALIDATE')->withStatus(400);
        }
        if ($name !== null && $name === '') {
            return ResponseLib::sendFail('Validation failed: name cannot be empty', [], 'E_VALIDATE')->withStatus(400);
        }

        $model = new CommodityModel();
        $updated = $model->update($id, $name, $flag);
        if (!$updated) {
            return ResponseLib::sendFail('Commodity Not Found or Not Updated', [], 'E_DATABASE')->withStatus(204);
        }
        return ResponseLib::sendOk($updated, 'S_UPDATED');
    }
}