<?php

declare(strict_types=1);

namespace KTXM\ServiceDav\Backends;

use KTXF\Documents\Entity\EntityBaseInterface;
use KTXF\Documents\Service\ServiceBaseInterface;
use KTXF\Documents\Service\ServiceEntityMutableInterface;
use KTXF\Resource\Identifier\EntityIdentifier;
use Sabre\DAV\Exception\Forbidden;
use Sabre\DAV\File;

/**
 * A file node backed by a document entity.
 */
class FilesEntityNode extends File
{
    public function __construct(
        private readonly ServiceBaseInterface $service,
        private readonly EntityBaseInterface $entity,
    ) {}

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

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

    /** @return resource|string */
    public function get()
    {
        return $this->service->entityRead($this->entityIdentifier());
    }

    public function put($data): ?string
    {
        if (!$this->service instanceof ServiceEntityMutableInterface) {
            throw new Forbidden('Entity is immutable');
        }

        $this->service->entityWrite(
            $this->entityIdentifier(),
            is_resource($data) ? stream_get_contents($data) : (string) $data,
        );

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

    public function delete(): void
    {
        if (!$this->service instanceof ServiceEntityMutableInterface) {
            throw new Forbidden('Entity is immutable');
        }

        $this->service->entityDelete($this->entityIdentifier());
    }

    public function getContentType(): ?string
    {
        return $this->entity->getProperties()->getMime();
    }

    public function getETag(): ?string
    {
        return '"' . $this->entity->signature() . '"';
    }

    public function getSize(): ?int
    {
        return $this->entity->getProperties()->size();
    }

    public function getLastModified(): ?int
    {
        return $this->entity->modified()?->getTimestamp() ?? null;
    }
}