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<?php

declare(strict_types=1);

namespace Mautic\IntegrationsBundle\Helper;

use Mautic\IntegrationsBundle\Exception\InvalidFormOptionException;
use Mautic\IntegrationsBundle\Integration\Interfaces\ConfigFormSyncInterface;
use Mautic\IntegrationsBundle\Mapping\MappedFieldInfoInterface;
use Mautic\IntegrationsBundle\Sync\DAO\Mapping\ObjectMappingDAO;

class FieldMergerHelper
{
    /**
     * @var MappedFieldInfoInterface[]
     */
    private ?array $allFields = null;

    public function __construct(
        private ConfigFormSyncInterface $integrationObject,
        private array $currentFieldMappings
    ) {
    }

    /**
     * @throws InvalidFormOptionException
     */
    public function mergeSyncFieldMapping(string $object, array $updatedFieldMappings): void
    {
        $this->allFields = $this->integrationObject->getAllFieldsForMapping($object);

        $this->removeNonExistentFieldMappings($object);

        $this->bindUpdatedFieldMappings($object, $updatedFieldMappings);
    }

    public function getFieldMappings(): array
    {
        return $this->currentFieldMappings;
    }

    private function removeNonExistentFieldMappings(string $object): void
    {
        if (!isset($this->currentFieldMappings[$object])) {
            $this->currentFieldMappings[$object] = [];
        }

        // Remove any fields that no longer exist
        $this->currentFieldMappings[$object] = array_intersect_key($this->currentFieldMappings[$object], $this->allFields);
    }

    /**
     * @throws InvalidFormOptionException
     */
    private function bindUpdatedFieldMappings(string $object, array $updatedFieldMappings): void
    {
        // Merge updated fields into current fields
        foreach ($updatedFieldMappings as $fieldName => $fieldMapping) {
            if (!isset($this->allFields[$fieldName])) {
                // Ignore as this field doesn't exist
                continue;
            }

            if (isset($this->currentFieldMappings[$object][$fieldName]) && !$fieldMapping) {
                // Mapping was deleted
                unset($this->currentFieldMappings[$object][$fieldName]);

                continue;
            }

            if (isset($this->currentFieldMappings[$object][$fieldName])) {
                // Merge the data
                $this->currentFieldMappings[$object][$fieldName] = [
                    'mappedField'   => $this->getMergedMappedField($fieldMapping, $object, $fieldName),
                    'syncDirection' => $this->getMergedSyncDirection($fieldMapping, $object, $fieldName),
                ];

                continue;
            }

            if (empty($fieldMapping['mappedField'])) {
                // Ignore this one because just direction was updated without a mapped field

                continue;
            }

            if (empty($fieldMapping['syncDirection'])) {
                $fieldMapping['syncDirection'] = $this->getDefaultSyncDirection($object, $fieldName);
            }

            $this->currentFieldMappings[$object][$fieldName] = $fieldMapping;
        }
    }

    /**
     * @throws InvalidFormOptionException
     */
    private function getDefaultSyncDirection(string $object, string $fieldName): string
    {
        $supportedDirections = $this->getSupportedSyncDirections($fieldName);

        if (!empty($this->currentFieldMappings[$object][$fieldName]['syncDirection'])
            && in_array(
                $this->currentFieldMappings[$object][$fieldName]['syncDirection'],
                $supportedDirections
            )) {
            // Keep the already configured value
            return $this->currentFieldMappings[$object][$fieldName]['syncDirection'];
        }

        return reset($supportedDirections);
    }

    /**
     * @throws InvalidFormOptionException
     */
    private function getSupportedSyncDirections(string $fieldName): array
    {
        $field               = $this->allFields[$fieldName];
        $supportedDirections = [];

        if ($field->isBidirectionalSyncEnabled()) {
            $supportedDirections[] = ObjectMappingDAO::SYNC_BIDIRECTIONALLY;
        }

        if ($field->isToIntegrationSyncEnabled()) {
            $supportedDirections[] = ObjectMappingDAO::SYNC_TO_INTEGRATION;
        }

        if ($field->isToMauticSyncEnabled()) {
            $supportedDirections[] = ObjectMappingDAO::SYNC_TO_MAUTIC;
        }

        if (empty($supportedDirections)) {
            throw new InvalidFormOptionException('field "'.$field->getName().'" must allow at least 1 direction for sync');
        }

        return $supportedDirections;
    }

    private function getMergedSyncDirection(array $fieldMapping, string $object, string $fieldName): string
    {
        if (empty($fieldMapping['syncDirection'])) {
            return $this->getDefaultSyncDirection($object, $fieldName);
        }

        $supportedDirections = $this->getSupportedSyncDirections($fieldName);
        if (in_array($fieldMapping['syncDirection'], $supportedDirections)) {
            return $fieldMapping['syncDirection'];
        }

        return reset($supportedDirections);
    }

    private function getMergedMappedField(array $fieldMapping, string $object, string $fieldName): string
    {
        if (empty($fieldMapping['mappedField'])) {
            // Updating just the sync direction so return original value
            return $this->currentFieldMappings[$object][$fieldName]['mappedField'];
        }

        return $fieldMapping['mappedField'];
    }
}