<?php

use Reservair\Logger\Logger;

/**
 * Handles submitting a form. If any element fails, nothing is persisted.
 */
class RsvFormSubmission {
    public function submit(string $formId, array $data) : array {
        $repo = new RsvFormDefinitionRepository();
        $row  = $repo->get((int) $formId);

        if ($row === null) {
            return ['success' => false, 'errors' => [['element' => '', 'code' => 'not_found', 'message' => 'Form not found']]];
        }

        $definition = new RsvFormDefinition($formId, $row['definition']);
        $form_data  = new RsvFormData($data);
        $processor  = new RsvFormProcessor();

        // Persist the submission first so element handlers can link to it.
        $submit_repo = new RsvFormSubmitRepository();
        $submit_id   = $submit_repo->add((int) $definition->getId(), $data);

        try {
            $result = $processor->submit($definition, $submit_id, $form_data);
        } catch (\Throwable $e) {
            Logger::error($e);
            $this->discard_submission($submit_repo, $submit_id);
            return ['success' => false, 'errors' => [['element' => '', 'code' => 'internal_error', 'message' => 'An unexpected error occurred.']]];
        }

        if ($result->hasErrors()) {
            $this->discard_submission($submit_repo, $submit_id);
            return ['success' => false, 'errors' => $result->getErrors()];
        }

        global $rsv_template_registry;
        $message = trim($definition->getSuccessMessage());
        if ($message !== '') {
            $allowed  = $rsv_template_registry->kses_allowed(wp_kses_allowed_html('post'));
            $template = wp_kses($message, $allowed);
        } else {
            $template = '';
        }

        $data = array_merge($result->getValues(), (new RsvFormCalculatedValues())->for($definition, $form_data));

        try {
            $submit_repo->set_computed($submit_id, $data);
        } catch (\Throwable $e) {
            Logger::error($e);
        }

        return ['success' => true, 'submit_id' => $submit_id, 'template' => $template, 'data' => $data];
    }

    /** Remove a submission whose run failed. */
    private function discard_submission(RsvFormSubmitRepository $repo, int $submit_id): void {
        try {
            $repo->delete($submit_id);
        } catch (\Throwable $e) {
            Logger::error($e);
        }
    }
}