<?php

declare(strict_types=1);

namespace KTXM\ServiceDav\Backends;

use KTXF\Documents\Collection\CollectionBaseInterface;
use KTXF\Documents\Service\ServiceBaseInterface;
use KTXF\Documents\Service\ServiceCollectionMutableInterface;
use KTXF\Documents\Service\ServiceEntityMutableInterface;
use KTXF\Resource\Identifier\CollectionIdentifier;
use KTXF\Resource\Identifier\EntityIdentifier;
use Sabre\DAV\Collection;
use Sabre\DAV\Exception\Forbidden;
use Sabre\DAV\INode;

/**
 * A folder-level WebDAV collection backed by a document collection.
 */
class FilesCollectionNode extends Collection
{
    public function __construct(
        private readonly ServiceBaseInterface $service,
        private readonly CollectionBaseInterface $collection,
    ) {}

    public function getName(): string
    {
        return $this->collection->getProperties()->getLabel() ?? (string) $this->collection->identifier();
    }

    /**
     * Identifier of the collection backing this node
     */
    private function collectionIdentifier(): CollectionIdentifier
    {
        return new CollectionIdentifier(
            $this->service->provider(),
            (string) $this->service->identifier(),
            (string) $this->collection->identifier(),
        );
    }

    /** @return INode[] */
    public function getChildren(): array
    {
        $nodes    = [];

        // ----- collections (folders) -----
        $decendents = $this->service->collectionList($this->collection->identifier());
        foreach ($decendents as $decendent) {
            $nodes[] = new FilesCollectionNode(
                $this->service,
                $decendent,
            );
        }

        // ----- entities (files) -----
        /** @var \KTXF\Documents\Entity\EntityBaseInterface[] $entities */
        $entities = $this->service->entityListBulk($this->collection->identifier());
        foreach ($entities as $entity) {
            if (is_object($entity)) {
                $nodes[] = new FilesEntityNode(
                    $this->service,
                    $entity,
                );
            }
        }

        return $nodes;
    }

    public function createDirectory($name): void
    {
        if (!$this->service instanceof ServiceCollectionMutableInterface) {
            throw new Forbidden('Service does not support collection creation');
        }

        $properties = $this->service->collectionFresh()->getProperties();
        $properties->setLabel($name);
        $this->service->collectionCreate($this->collectionIdentifier(), $properties);
    }

    public function createFile($name, $data = null): string
    {
        if (!$this->service instanceof ServiceEntityMutableInterface) {
            throw new Forbidden('Service does not support entity creation');
        }

        $properties = $this->service->entityFresh()->getProperties();
        $properties->setLabel($name);
        $entity = $this->service->entityCreate($this->collectionIdentifier(), $properties);

        if ($data !== null) {
            $content = is_resource($data) ? stream_get_contents($data) : (string) $data;
            $this->service->entityWrite(
                new EntityIdentifier(
                    $this->service->provider(),
                    (string) $this->service->identifier(),
                    (string) $entity->collection(),
                    (string) $entity->identifier(),
                ),
                $content,
            );
        }

        return '"' . md5($entity->identifier() . time()) . '"';
    }

    public function delete(): void
    {
        if (!$this->service instanceof ServiceCollectionMutableInterface) {
            throw new Forbidden('Service does not support collection deletion');
        }

        $this->service->collectionDelete($this->collectionIdentifier(), true);
    }
}