<?php

use Reservair\Logger\Logger;

class RsvFormProcessor {
    /** Submit every element. If one fails, undo the ones that already succeeded. */
    public function submit(RsvFormDefinition $definition, int $submit_id, RsvFormData $data): RsvFormSubmitResult {
        global $rsv_form_registry;

        $result    = new RsvFormSubmitResult();
        $committed = [];

        foreach ($definition->getElements() as $element) {
            $handler = $rsv_form_registry->get($element->getType());
            if ($handler === null) {
                $result->addError($element->getName(), 'handler_missing', 'No handler registered for element type ' . $element->getType());
                $this->rollback_all($committed, $submit_id, $data, $result);
                return $result;
            }

            if (!$handler->submit($element, $submit_id, $data->getElements(), $result)) {
                $this->rollback_all($committed, $submit_id, $data, $result);
                return $result;
            }

            $committed[] = [$handler, $element];
        }

        return $result;
    }

    /**
     * @param array<int,array{0:RsvFormElementHandler,1:RsvFormElementDefinition}> $committed
     */
    private function rollback_all(array $committed, int $submit_id, RsvFormData $data, RsvFormSubmitResult $result): void {
        foreach (array_reverse($committed) as [$handler, $element]) {
            try {
                $handler->rollback($element, $submit_id, $data->getElements(), $result);
            } catch (\Throwable $e) {
                Logger::error($e);
            }
        }
    }
}