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<?php

declare(strict_types=1);

namespace Mautic\FormBundle\Collector;

use Mautic\CacheBundle\Cache\CacheProviderInterface;

/**
 * We need to store mapped fields in the form field builder so we could remove the used ones from the select box.
 */
final class AlreadyMappedFieldCollector implements AlreadyMappedFieldCollectorInterface
{
    private const EXPIRATION_IN_SECONDS = 18000;

    public function __construct(
        private CacheProviderInterface $cacheProvider
    ) {
    }

    public function getFields(string $formId, string $object): array
    {
        $cacheItem = $this->cacheProvider->getItem($this->buildCacheKey($formId, $object));

        return json_decode($cacheItem->get() ?? '[]', true);
    }

    public function addField(string $formId, string $object, string $fieldKey): void
    {
        $this->fetchAndSave($formId, $object, function (array $fields) use ($fieldKey): array {
            if (!in_array($fieldKey, $fields, true)) {
                $fields[] = $fieldKey;
            }

            return $fields;
        });
    }

    public function removeField(string $formId, string $object, string $fieldKey): void
    {
        $this->fetchAndSave($formId, $object, function (array $fields) use ($fieldKey) {
            $cacheKey = array_search($fieldKey, $fields, true);

            if (false !== $cacheKey) {
                unset($fields[$cacheKey]);

                // Reset indexes.
                $fields = array_values($fields);
            }

            return $fields;
        });
    }

    public function removeAllForForm(string $formId): void
    {
        $this->cacheProvider->invalidateTags([$this->buildCacheTag($formId)]);
    }

    private function fetchAndSave(string $formId, string $object, callable $callback): void
    {
        $cacheItem = $this->cacheProvider->getItem($this->buildCacheKey($formId, $object));
        $fields    = json_decode($cacheItem->get() ?? '[]', true);
        $cacheItem->set(json_encode($callback($fields)));
        $cacheItem->expiresAfter(self::EXPIRATION_IN_SECONDS);
        $cacheItem->tag($this->buildCacheTag($formId));
        $this->cacheProvider->save($cacheItem);
    }

    private function buildCacheKey(string $formId, string $object): string
    {
        return sprintf('mautic.form.%s.object.%s.fields.mapped', $formId, $object);
    }

    private function buildCacheTag(string $formId): string
    {
        return sprintf('mautic.form.%s.fields.mapped', $formId);
    }
}