Deprecation: #98453 - Scheduler task registration via SC_OPTIONS 

use MyVendor\MyExtension\Task\MyTask;
use MyVendor\MyExtension\Task\MyTaskAdditionalFieldProvider;

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['scheduler']['tasks'][MyTask::class] = [
    'extension' => 'my_extension',
    'title' => 'LLL:EXT:my_extension/Resources/Private/Language/locallang.xlf:myTask.title',
    'description' => 'LLL:EXT:my_extension/Resources/Private/Language/locallang.xlf:myTask.description',
    'additionalFields' => MyTaskAdditionalFieldProvider::class,
];

use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
use MyVendor\MyExtension\Task\MyTask;

defined('TYPO3') or die();

if (isset($GLOBALS['TCA']['tx_scheduler_task'])) {
    // Add custom fields to the tx_scheduler_task table
    ExtensionManagementUtility::addTCAcolumns(
        'tx_scheduler_task',
        [
            'my_extension_field' => [
                'label' => 'LLL:EXT:my_extension/Resources/Private/Language/locallang.xlf:field.label',
                'config' => [
                    'type' => 'input',
                    'size' => 30,
                    'required' => true,
                    'eval' => 'trim', // FormEngine validation replaces custom validation
                    'placeholder' => 'Enter value here...',
                ],
            ],
            'my_extension_email_list' => [
                'label' => 'LLL:EXT:my_extension/Resources/Private/Language/locallang.xlf:emailList.label',
                'config' => [
                    'type' => 'text',
                    'rows' => 3,
                    'required' => true, // 'required' validation handled by FormEngine
                    'placeholder' => 'admin@example.com',
                ],
            ],
        ]
    );

    // Register the task type
    ExtensionManagementUtility::addRecordType(
        [
            'label' => 'LLL:EXT:my_extension/Resources/Private/Language/locallang.xlf:myTask.title',
            'description' => 'LLL:EXT:my_extension/Resources/Private/Language/locallang.xlf:myTask.description',
            'value' => MyTask::class,
            'icon' => 'mimetypes-x-tx_scheduler_task_group',
            'group' => 'my_extension',
        ],
        '
        --div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:general,
            tasktype,
            task_group,
            description,
            my_extension_field,
            my_extension_email_list,
        --div--;LLL:EXT:scheduler/Resources/Private/Language/locallang.xlf:scheduler.form.palettes.timing,
            execution_details,
            nextexecution,
            --palette--;;lastexecution,
        --div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:access,
            disable,
        --div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:extended,',
        [],
        '',
        'tx_scheduler_task'
    );
}

namespace MyVendor\MyExtension\Task;

use TYPO3\CMS\Core\Messaging\FlashMessage;
use TYPO3\CMS\Core\Messaging\FlashMessageService;
use TYPO3\CMS\Core\Type\ContextualFeedbackSeverity;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Scheduler\Task\AbstractTask;

class MyTask extends AbstractTask
{
    protected string $myField = '';
    protected string $emailList = '';

    public function execute(): bool
    {
        // Your task logic here using $this->myField and $this->emailList
        return true;
    }

    /**
     * Return current field values as associative array.
     * This method is called during migration from old serialized tasks
     * and when displaying task information.
     */
    public function getTaskParameters(): array
    {
        return [
            'my_extension_field' => $this->myField,
            'my_extension_email_list' => $this->emailList,
        ];
    }

    /**
     * Set field values from associative array.
     * This method handles both old and new parameter formats for migration.
     *
     * @param array $parameters Values from either old AdditionalFieldProvider or new TCA fields
     */
    public function setTaskParameters(array $parameters): void
    {
        // Handle migration: check old parameter names first, then new TCA field names
        $this->myField = $parameters['myField'] ?? $parameters['my_extension_field'] ?? '';
        $this->emailList = $parameters['emailList'] ?? $parameters['my_extension_email_list'] ?? '';
    }

    /**
     * Validate task parameters.
     * Only implement this method for validation that cannot be handled by FormEngine.
     * Basic validation like 'required' should be done via TCA 'eval' configuration.
     */
    public function validateTaskParameters(array $parameters): bool
    {
        $isValid = true;

        // Example: Custom email validation (beyond basic 'required' check)
        $emailList = $parameters['my_extension_email_list'] ?? '';
        if (!empty($emailList)) {
            $emails = GeneralUtility::trimExplode(',', $emailList, true);
            foreach ($emails as $email) {
                if (!GeneralUtility::validEmail($email)) {
                    GeneralUtility::makeInstance(FlashMessageService::class)
                        ->getMessageQueueByIdentifier()
                        ->addMessage(
                            GeneralUtility::makeInstance(
                                FlashMessage::class,
                                'Invalid email address: ' . $email,
                                '',
                                ContextualFeedbackSeverity::ERROR
                            )
                        );
                    $isValid = false;
                }
            }
        }

        return $isValid;
    }

    public function getAdditionalInformation(): string
    {
        $info = [];
        if ($this->myField !== '') {
            $info[] = 'Field: ' . $this->myField;
        }
        if ($this->emailList !== '') {
            $info[] = 'Emails: ' . $this->emailList;
        }
        return implode(', ', $info);
    }
}