<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: Sebastian Krupinski <krupinski01@gmail.com>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace KTXM\ProviderLocalDocuments\Providers\Personal;

use Generator;
use KTXF\Blob\Signature;
use KTXF\Documents\Collection\CollectionBaseInterface;
use KTXF\Documents\Collection\CollectionPropertiesBaseInterface;
use KTXF\Documents\Entity\EntityPropertiesMutableInterface;
use KTXF\Documents\Service\ServiceBaseInterface;
use KTXF\Documents\Service\ServiceCollectionMutableInterface;
use KTXF\Documents\Service\ServiceEntityMutableInterface;
use KTXF\Files\Node\NodeType;
use KTXF\Resource\Delta\Delta;
use KTXF\Resource\Exceptions\InvalidParameterException;
use KTXF\Resource\Filter\Filter;
use KTXF\Resource\Filter\IFilter;
use KTXF\Resource\Identifier\CollectionIdentifier;
use KTXF\Resource\Identifier\CollectionIdentifierInterface;
use KTXF\Resource\Identifier\EntityIdentifier;
use KTXF\Resource\Identifier\EntityIdentifierInterface;
use KTXF\Resource\Range\IRange;
use KTXF\Resource\Range\RangeTally;
use KTXF\Resource\Range\RangeType;
use KTXF\Resource\Sort\ISort;
use KTXF\Resource\Sort\Sort;
use KTXM\ProviderLocalDocuments\Store\BlobStore;
use KTXM\ProviderLocalDocuments\Store\MetaStore;

class PersonalService implements ServiceBaseInterface, ServiceCollectionMutableInterface, ServiceEntityMutableInterface {

	public const ROOT_ID = '00000000-0000-0000-0000-000000000000';
	public const ROOT_LABEL = 'Personal Local Documents';

	protected const PROVIDER_IDENTIFIER = 'default';
	protected const SERVICE_IDENTIFIER = 'personal';
	protected const SERVICE_LABEL = 'Personal Documents Storage';

	protected array $serviceCollectionCache = [];
	protected array $serviceEntityCache = [];
	protected ?string $serviceTenantId = null;
	protected ?string $serviceUserId = null;
	protected ?bool $serviceEnabled = true;
	protected ?string $serviceRoot = null;

    private array $serviceAbilities = [
		self::CAPABILITY_COLLECTION_LIST => true,
		self::CAPABILITY_COLLECTION_LIST_FILTER => [
            self::CAPABILITY_COLLECTION_FILTER_LABEL => 's:100:256:256',
		],
		self::CAPABILITY_COLLECTION_LIST_SORT => [
            self::CAPABILITY_COLLECTION_SORT_LABEL,
		],
		self::CAPABILITY_COLLECTION_EXTANT => true,
		self::CAPABILITY_COLLECTION_FETCH => true,
        self::CAPABILITY_COLLECTION_CREATE => true,
        self::CAPABILITY_COLLECTION_UPDATE => true,
        self::CAPABILITY_COLLECTION_DELETE => true,
        self::CAPABILITY_COLLECTION_MOVE => true,
        self::CAPABILITY_COLLECTION_COPY => true,
		self::CAPABILITY_ENTITY_LIST => true,
		self::CAPABILITY_ENTITY_LIST_FILTER => [
			self::CAPABILITY_ENTITY_FILTER_ALL => 's:200:256:256',
			self::CAPABILITY_ENTITY_FILTER_ID => 's:100:256:256',
			self::CAPABILITY_ENTITY_FILTER_URID => 's:100:256:256',
			self::CAPABILITY_ENTITY_FILTER_LABEL => 's:100:256:256',
		],
		self::CAPABILITY_ENTITY_LIST_SORT => [
            self::CAPABILITY_ENTITY_SORT_ID,
			self::CAPABILITY_ENTITY_SORT_LABEL,
		],
		self::CAPABILITY_ENTITY_LIST_RANGE => [
			self::CAPABILITY_ENTITY_RANGE_TALLY => [
				self::CAPABILITY_ENTITY_RANGE_TALLY_ABSOLUTE,
				self::CAPABILITY_ENTITY_RANGE_TALLY_RELATIVE
			],
		],
		self::CAPABILITY_ENTITY_DELTA => true,
		self::CAPABILITY_ENTITY_EXTANT => true,
		self::CAPABILITY_ENTITY_FETCH => true,
		self::CAPABILITY_ENTITY_CREATE => true,
		self::CAPABILITY_ENTITY_MODIFY => true,
		self::CAPABILITY_ENTITY_DELETE => true,
		self::CAPABILITY_ENTITY_MOVE => true,
		self::CAPABILITY_ENTITY_COPY => true,
		self::CAPABILITY_ENTITY_READ => true,
		self::CAPABILITY_ENTITY_WRITE => true,
	];

	public function __construct(
		private readonly MetaStore $metaStore,
		private readonly BlobStore $blobStore,
	) {}

	public function initialize(string $tenantId, string $userId, string $root): self {
		$this->serviceTenantId = $tenantId;
		$this->serviceUserId = $userId;
		$this->serviceRoot = $root;

		// configure blob store with root path
		$this->blobStore->configureRoot($root);

		$this->serviceCollectionCache = [];
		$root = new CollectionResource();
		$root->fromStore([
			'tid' => $tenantId,
			'uid' => $userId,
			'cid' => self::ROOT_ID,
			'nid' => null,
			'properties' => [
				'label' => self::ROOT_LABEL,
			],
		]);
		$this->serviceCollectionCache[self::ROOT_ID] = $root;

		return $this;
	}

    public function jsonSerialize(): array {
        return array_filter([
            self::PROPERTY_TYPE => self::JSON_TYPE,
            self::PROPERTY_PROVIDER => self::PROVIDER_IDENTIFIER,
            self::PROPERTY_IDENTIFIER => self::SERVICE_IDENTIFIER,
            self::PROPERTY_LABEL => self::SERVICE_LABEL,
            self::PROPERTY_ENABLED => $this->serviceEnabled,
            self::PROPERTY_CAPABILITIES => $this->serviceAbilities,
            self::PROPERTY_LOCATION => null,
            self::PROPERTY_IDENTITY => null,
            self::PROPERTY_AUXILIARY => [],
        ], fn($v) => $v !== null);
    }

	public function capable(string $value): bool {
		if (isset($this->serviceAbilities[$value])) {
			return (bool)$this->serviceAbilities[$value];
		}
		return false;
	}

	public function capabilities(): array {
		return $this->serviceAbilities;
	}

    public function provider(): string {
        return self::PROVIDER_IDENTIFIER;
    }

	public function identifier(): string {
		return self::SERVICE_IDENTIFIER;
	}

	public function getLabel(): string {
		return (string)self::SERVICE_LABEL;
	}

	public function getEnabled(): bool {
		return (bool)$this->serviceEnabled;
	}

	public function setEnabled(bool $enabled): static {
        $this->serviceEnabled = $enabled;
        return $this;
    }

	public function getLocation(): null {
		return null;
    }

	public function getIdentity(): null {
        return null;
    }

	public function getAuxiliary(): array {
		return [];
	}

	/**
	 * Normalize a collection location, treating null and '' as the root collection
	 */
	private function normalizeLocation(string|int|null $location): string|int {
		return ($location === null || $location === '') ? self::ROOT_ID : $location;
	}

	// Collection operations

	public function collectionList(string|int|null $location, ?IFilter $filter = null, ?ISort $sort = null): array {
		$location = $this->normalizeLocation($location);
		$entries = $this->metaStore->collectionList($this->serviceTenantId, $this->serviceUserId, $location, $filter, $sort);
		// cache collections
		foreach ($entries as $id => $collection) {
			$this->serviceCollectionCache[$id] = $collection;
		}
		return $entries ?? [];
	}

	public function collectionListFilter(): IFilter {
		return new Filter($this->serviceAbilities[self::CAPABILITY_COLLECTION_LIST_FILTER] ?? []);
	}

	public function collectionListSort(): ISort {
		return new Sort($this->serviceAbilities[self::CAPABILITY_COLLECTION_LIST_SORT] ?? []);
	}

	public function collectionExtant(string|int|null $location, string|int ...$identifiers): array {
		$cached = [];
		$toCheck = [];
		foreach ($identifiers as $id) {
			if (isset($this->serviceCollectionCache[$id])) {
				$cached[$id] = true;
			} else {
				$toCheck[] = $id;
			}
		}
		if (empty($toCheck)) {
			return $cached;
		}
		$fromStore = $this->metaStore->collectionExtant($this->serviceTenantId, $this->serviceUserId, ...$toCheck);
		return array_merge($cached, $fromStore);
	}

	/**
	 * Determine whether a single collection exists and belongs to the current user
	 */
	private function collectionAccessible(string|int $collection): bool {
		$response = $this->collectionExtant(null, $collection);
		return ($response[$collection] ?? false) === true;
	}

	public function collectionFetch(string|int|null $identifier): ?CollectionResource {
		// null is root
		$identifier = $this->normalizeLocation($identifier);
		// check cache first
		if (isset($this->serviceCollectionCache[$identifier])) {
			return $this->serviceCollectionCache[$identifier];
		}
		// fetch from store
		$collections = $this->metaStore->collectionFetch($this->serviceTenantId, $this->serviceUserId, $identifier);
		if (isset($collections[$identifier])) {
			$this->serviceCollectionCache[$identifier] = $collections[$identifier];
			return $collections[$identifier];
		}
		return null;
	}

	public function collectionFresh(): CollectionResource {
		$collection =  new CollectionResource();
		$collection->fromStore([
			'tid' => $this->serviceTenantId,
			'uid' => $this->serviceUserId,
			'cid' => null,
			'nid' => null,
			'type' => NodeType::Collection->value,
			'properties' => [
				'label' => '',
			],
		]);
		return $collection;
	}

	/**
	 * Convert incoming collection properties into a native CollectionResource
	 */
	private function collectionNative(CollectionPropertiesBaseInterface $properties, string|int|null $identifier = null): CollectionResource {
		if ($properties instanceof CollectionResource) {
			$native = clone $properties;
		} else {
			$native = $this->collectionFresh();
			$native->jsonDeserialize([
				CollectionResource::PROPERTY_IDENTIFIER => $identifier,
				CollectionResource::PROPERTY_PROPERTIES => $properties->jsonSerialize(),
			]);
		}
		return $native;
	}

	public function collectionCreate(CollectionIdentifierInterface|null $target, CollectionPropertiesBaseInterface $properties, array $options = []): CollectionResource {
		// null target is root
		$location = $this->normalizeLocation($target?->collection());
		// convert properties to a native collection
		$collection = $this->collectionNative($properties);
		// Create in meta store
		$node = $this->metaStore->collectionCreate($this->serviceTenantId, $this->serviceUserId, $location, $collection, $options);
		// cache collection
		$this->serviceCollectionCache[$node->identifier()] = $node;
		return $node;
	}

	public function collectionUpdate(CollectionIdentifierInterface $target, CollectionPropertiesBaseInterface $properties): CollectionResource {
		$identifier = $target->collection();
		// convert properties to a native collection
		$collection = $this->collectionNative($properties, $identifier);
		// Modify in meta store
		$node = $this->metaStore->collectionModify($this->serviceTenantId, $this->serviceUserId, $identifier, $collection);

		// update cache
		$this->serviceCollectionCache[$node->identifier()] = $node;
		return $node;
	}

	public function collectionDelete(CollectionIdentifierInterface $target, bool $force = false): CollectionBaseInterface | true {
		$identifier = $target->collection();
		// Protect root collection
		if ($identifier === self::ROOT_ID) {
			throw new InvalidParameterException("Cannot destroy root collection");
		}

		// If not forcing, ensure the collection is empty
		if (!$force) {
			$children = $this->metaStore->nodeList($this->serviceTenantId, $this->serviceUserId, $identifier, false);
			if (!empty($children)) {
				throw new InvalidParameterException("Collection is not empty: $identifier");
			}
		}

		// Delete blob files for all entities within the collection tree
		$descendants = $this->metaStore->nodeList($this->serviceTenantId, $this->serviceUserId, $identifier, true);
		foreach ($descendants as $nodeId => $node) {
			if ($node instanceof EntityResource) {
				$this->blobStore->blobDelete((string)$nodeId);
			}
		}

		// Delete from meta store (handles recursive collection/entity meta deletion internally)
		$this->metaStore->collectionDestroy($this->serviceTenantId, $this->serviceUserId, $identifier);

		// remove from cache
		unset($this->serviceCollectionCache[$identifier]);
		return true;
	}

	public function collectionCopy(CollectionIdentifierInterface|null $target, CollectionIdentifierInterface $source): CollectionResource {
		$identifier = $source->collection();
		// Protect root collection
		if ($identifier === self::ROOT_ID) {
			throw new InvalidParameterException("Cannot copy root collection");
		}
		// Verify collection exists
		if ($this->collectionAccessible($identifier) === false) {
			throw new InvalidParameterException("Collection not found: $identifier");
		}

		// null target is root
		$location = $this->normalizeLocation($target?->collection());
		// Copy in meta store
		$node = $this->metaStore->collectionCopy($this->serviceTenantId, $this->serviceUserId, $identifier, $location);

		// cache collection
		$this->serviceCollectionCache[$node->identifier()] = $node;
		return $node;
	}

	public function collectionMove(CollectionIdentifierInterface|null $target, CollectionIdentifierInterface $source): CollectionResource {
		$identifier = $source->collection();
		// Protect root collection
		if ($identifier === self::ROOT_ID) {
			throw new InvalidParameterException("Cannot move root collection");
		}
		// Verify collection exists
		if ($this->collectionAccessible($identifier) === false) {
			throw new InvalidParameterException("Collection not found: $identifier");
		}

		// null target is root
		$location = $this->normalizeLocation($target?->collection());
		// Move in meta store
		$node = $this->metaStore->collectionMove($this->serviceTenantId, $this->serviceUserId, $identifier, $location);

		// update cache
		$this->serviceCollectionCache[$node->identifier()] = $node;
		return $node;
	}

	// Entity operations

	public function entityListBulk(string|int|null $collection, ?IFilter $filter = null, ?ISort $sort = null, ?IRange $range = null, ?array $properties = null): array {
		// null collection is root
		$collection = $this->normalizeLocation($collection);

		$entries = $this->metaStore->entityList($this->serviceTenantId, $this->serviceUserId, $collection, $filter, $sort, $range);
		// cache entities
		foreach ($entries as $entity) {
			$this->serviceEntityCache[$entity->identifier()] = $entity;
		}
		return $entries ?? [];
	}

	public function entityListStream(string|int|null $collection, ?IFilter $filter = null, ?ISort $sort = null, ?IRange $range = null, ?array $properties = null): Generator {
		yield from $this->entityListBulk($collection, $filter, $sort, $range, $properties);
	}

	public function entityListFilter(): IFilter {
		return new Filter($this->serviceAbilities[self::CAPABILITY_ENTITY_LIST_FILTER] ?? []);
	}

	public function entityListSort(): ISort {
		return new Sort($this->serviceAbilities[self::CAPABILITY_ENTITY_LIST_SORT] ?? []);
	}

	public function entityListRange(RangeType $type): IRange {
		if ($type !== RangeType::TALLY) {
			throw new InvalidParameterException("Invalid: Entity range of type '{$type->value}' is not supported");
		}
		return new RangeTally();
	}

	public function entityFetchBulk(EntityIdentifierInterface ...$identifiers): array {
		$result = [];
		// group identifiers by collection
		$byCollection = [];
		foreach ($identifiers as $identifier) {
			$id = $identifier->entity();
			// check cache first
			if (isset($this->serviceEntityCache[$id])) {
				$result[$id] = $this->serviceEntityCache[$id];
				continue;
			}
			$byCollection[$this->normalizeLocation($identifier->collection())][] = $id;
		}
		// fetch remaining from store
		foreach ($byCollection as $collection => $entityIds) {
			$fetched = $this->metaStore->entityFetch($this->serviceTenantId, $this->serviceUserId, $collection, ...$entityIds);
			foreach ($fetched as $id => $entity) {
				$this->serviceEntityCache[$id] = $entity;
				$result[$id] = $entity;
			}
		}
		return $result;
	}

	public function entityFetchStream(EntityIdentifierInterface ...$identifiers): Generator {
		yield from $this->entityFetchBulk(...$identifiers);
	}

	public function entityExtant(string|int|null $collection, string|int ...$identifiers): array {
		// null collection is root
		$collection = $this->normalizeLocation($collection);

		$result = [];
		foreach ($identifiers as $id) {
			// check cache first
			if (isset($this->serviceEntityCache[$id])) {
				$result[$id] = true;
				continue;
			}
			// check store
			$result[$id] = $this->metaStore->entityExtant($this->serviceTenantId, $this->serviceUserId, $collection, $id);
		}

		return $result;
	}

	public function entityFresh(): EntityResource {
		$entity = new EntityResource();
		$entity->fromStore([
			'tid' => $this->serviceTenantId,
			'uid' => $this->serviceUserId,
			'cid' => null,
			'nid' => null,
			'created' => (int) round(microtime(true) * 1000),
			'properties' => [],
		]);
		return $entity;
	}

	/**
	 * Convert incoming entity properties into a native EntityResource
	 */
	private function entityNative(EntityPropertiesMutableInterface $properties, string|int|null $identifier = null): EntityResource {
		if ($properties instanceof EntityResource) {
			$native = clone $properties;
		} else {
			$native = $this->entityFresh();
			$native->jsonDeserialize([
				EntityResource::PROPERTY_IDENTIFIER => $identifier,
				EntityResource::PROPERTY_PROPERTIES => $properties->jsonSerialize(),
			]);
		}
		return $native;
	}

	public function entityCreate(CollectionIdentifierInterface $target, EntityPropertiesMutableInterface $properties, array $options = []): EntityResource {
		// null collection is root
		$collection = $this->normalizeLocation($target->collection());
		// convert properties to a native entity
		$entity = $this->entityNative($properties);

		// Create in meta store
		$result = $this->metaStore->entityCreate($this->serviceTenantId, $this->serviceUserId, $collection, $entity, $options);

		// Write meta file for recovery
		$this->blobStore->metaWrite((string)$result->identifier(), $this->buildEntityMeta($result));

		// cache entity
		$this->serviceEntityCache[$result->identifier()] = $result;
		return $result;
	}

	public function entityModify(EntityIdentifierInterface $target, EntityPropertiesMutableInterface $properties): EntityResource {
		// null collection is root
		$collection = $this->normalizeLocation($target->collection());
		$identifier = $target->entity();
		// convert properties to a native entity
		$entity = $this->entityNative($properties, $identifier);

		// Modify in meta store
		$result = $this->metaStore->entityModify($this->serviceTenantId, $this->serviceUserId, $collection, $identifier, $entity);

		// Update meta file for recovery
		$this->blobStore->metaWrite((string)$result->identifier(), $this->buildEntityMeta($result));

		// update cache
		$this->serviceEntityCache[$result->identifier()] = $result;
		return $result;
	}

	public function entityDelete(EntityIdentifierInterface ...$targets): array {
		$results = [];
		foreach ($targets as $target) {
			$key = (string) $target;
			$collection = $this->normalizeLocation($target->collection());
			$identifier = $target->entity();
			// validate entity extant and ownership
			$extant = $this->entityExtant($collection, $identifier);
			if (($extant[$identifier] ?? false) === false) {
				$results[$key] = ['disposition' => 'error', 'destination' => null, 'mutation' => $target];
				continue;
			}

			// Delete from blob store
			$this->blobStore->blobDelete((string)$identifier);

			// Delete from meta store
			$this->metaStore->entityDestroy($this->serviceTenantId, $this->serviceUserId, $collection, $identifier);

			// remove from cache
			unset($this->serviceEntityCache[$identifier]);
			$results[$key] = ['disposition' => 'deleted', 'destination' => null, 'mutation' => $target];
		}
		return $results;
	}

	public function entityDelta(string|int|null $collection, string $signature): Delta {
		// null collection is root
		$collection = $this->normalizeLocation($collection);
		return new Delta(); // $this->metaStore->entityDelta($this->serviceTenantId, $this->serviceUserId, $collection, $signature);
	}

	public function entityMove(CollectionIdentifierInterface $target, EntityIdentifierInterface ...$sources): array {
		return $this->entityRelocate($target, true, ...$sources);
	}

	public function entityCopy(CollectionIdentifierInterface $target, EntityIdentifierInterface ...$sources): array {
		return $this->entityRelocate($target, false, ...$sources);
	}

	/**
	 * Relocate (move or copy) entities into a target collection.
	 *
	 * Moves retain the entity identifier (blob path is keyed by entity id and never
	 * changes); copies receive a fresh identifier and a duplicated blob.
	 *
	 * @param CollectionIdentifierInterface $target destination collection identifier
	 * @param bool $remove true to move (relocate the source), false to copy
	 * @param EntityIdentifierInterface ...$sources source entity identifiers
	 *
	 * @return array<string, array{disposition: string, destination: ?CollectionIdentifierInterface, mutation: EntityIdentifierInterface}>
	 */
	private function entityRelocate(CollectionIdentifierInterface $target, bool $remove, EntityIdentifierInterface ...$sources): array {
		$results = [];
		$disposition = $remove ? 'moved' : 'copied';
		$targetCollection = $this->normalizeLocation($target->collection());
		// validate target collection extant and ownership
		$targetValid = $targetCollection === self::ROOT_ID || $this->collectionAccessible($targetCollection);
		foreach ($sources as $source) {
			$key = (string) $source;
			$sourceCollection = $this->normalizeLocation($source->collection());
			$identifier = $source->entity();
			// validate target collection
			if ($targetValid === false) {
				$results[$key] = ['disposition' => 'error', 'destination' => null, 'mutation' => $source];
				continue;
			}
			// validate source entity extant and ownership
			$extant = $this->entityExtant($sourceCollection, $identifier);
			if (($extant[$identifier] ?? false) === false) {
				$results[$key] = ['disposition' => 'error', 'destination' => null, 'mutation' => $source];
				continue;
			}
			if ($remove) {
				// Move in meta store (blob path never changes since it is keyed by entity id)
				$node = $this->metaStore->entityMove($this->serviceTenantId, $this->serviceUserId, $sourceCollection, $identifier, $targetCollection);
			} else {
				// Copy in meta store (creates new entity with new id)
				$node = $this->metaStore->entityCopy($this->serviceTenantId, $this->serviceUserId, $sourceCollection, $identifier, $targetCollection);
				// Copy blob content (new entity has new id = new file)
				$content = $this->blobStore->blobRead((string)$identifier);
				if ($content !== null) {
					$this->blobStore->blobWrite((string)$node->identifier(), $content);
				}
			}
			// Write meta file for recovery
			$this->blobStore->metaWrite((string)$node->identifier(), $this->buildEntityMeta($node));
			// cache entity
			$this->serviceEntityCache[$node->identifier()] = $node;
			// construct destination and mutation identifiers
			$destination = new CollectionIdentifier($this->provider(), $this->identifier(), (string)$targetCollection);
			$mutation = new EntityIdentifier($this->provider(), $this->identifier(), (string)$targetCollection, (string)$node->identifier());
			$results[$key] = ['disposition' => $disposition, 'destination' => $destination, 'mutation' => $mutation];
		}
		return $results;
	}

	// Entity content (blob) operations

	/**
	 * Confirm an entity exists, returning its normalized collection identifier
	 */
	private function entityAccessible(EntityIdentifierInterface $target): string|int|false {
		$collection = $this->normalizeLocation($target->collection());
		$identifier = $target->entity();
		$extant = $this->entityExtant($collection, $identifier);
		return ($extant[$identifier] ?? false) ? $collection : false;
	}

	public function entityRead(EntityIdentifierInterface $target): ?string {
		if ($this->entityAccessible($target) === false) {
			return null;
		}
		return $this->blobStore->blobRead((string)$target->entity());
	}

	public function entityReadStream(EntityIdentifierInterface $target) {
		if ($this->entityAccessible($target) === false) {
			return null;
		}
		return $this->blobStore->blobReadStream((string)$target->entity());
	}

	public function entityReadChunk(EntityIdentifierInterface $target, int $offset, int $length): ?string {
		if ($this->entityAccessible($target) === false) {
			return null;
		}
		return $this->blobStore->blobReadChunk((string)$target->entity(), $offset, $length);
	}

	public function entityWrite(EntityIdentifierInterface $target, string $data): int {
		$collection = $this->entityAccessible($target);
		$identifier = $target->entity();
		if ($collection === false) {
			throw new InvalidParameterException("Entity not found: $identifier");
		}

		// detect MIME type and format from content header
		$signature = Signature::detect(substr($data, 0, Signature::HEADER_SIZE));

		// Write blob data
		$size = $this->blobStore->blobWrite((string)$identifier, $data);
		if ($size === null) {
			throw new \RuntimeException("Failed to write to entity: $identifier");
		}

		// Update meta store
		$result = $this->metaStore->entityModify($this->serviceTenantId, $this->serviceUserId, $collection, $identifier, [
			'properties' => [
				'size' => $size,
				'mime' => $signature['mime'],
				'format' => $signature['format'],
			],
		], true);

		// Update meta blob
		$this->blobStore->metaWrite($result->identifier(), $this->buildEntityMeta($result));

		// update cache
		$this->serviceEntityCache[$result->identifier()] = $result;

		return $size;
	}

	public function entityWriteStream(EntityIdentifierInterface $target) {
		$collection = $this->entityAccessible($target);
		$identifier = $target->entity();
		if ($collection === false) {
			throw new InvalidParameterException("Entity not found: $identifier");
		}

		// write blob stream
		$stream = $this->blobStore->blobWriteStream((string)$identifier);
		if ($stream === null) {
			throw new \RuntimeException("Failed to open write stream for entity: $identifier");
		}

		// update meta store
		$size = $this->blobStore->blobSize((string)$identifier) ?? 0;
		$result = $this->metaStore->entityModify($this->serviceTenantId, $this->serviceUserId, $collection, $identifier, [
			'properties' => [
				'size' => $size,
			],
		], true);

		// update meta blob
		$this->blobStore->metaWrite($result->identifier(), $this->buildEntityMeta($result));

		// update cache
		$this->serviceEntityCache[$result->identifier()] = $result;

		return $stream;
	}

	public function entityWriteChunk(EntityIdentifierInterface $target, int $offset, string $data): int {
		$collection = $this->entityAccessible($target);
		$identifier = $target->entity();
		if ($collection === false) {
			throw new InvalidParameterException("Entity not found: $identifier");
		}

		// Detect MIME type and format from first chunk (offset === 0)
		$signature = null;
		if ($offset === 0) {
			$signature = Signature::detect(substr($data, 0, Signature::HEADER_SIZE));
		}

		$bytes = $this->blobStore->blobWriteChunk((string)$identifier, $offset, $data);
		if ($bytes === null) {
			throw new \RuntimeException("Failed to write chunk to entity: $identifier");
		}

		// update meta store
		$size = $this->blobStore->blobSize((string)$identifier) ?? 0;
		$result = $this->metaStore->entityModify($this->serviceTenantId, $this->serviceUserId, $collection, $identifier, [
			'properties' => [
				'size' => $size,
				'mime' => $signature['mime'] ?? null,
				'format' => $signature['format'] ?? null,
			]
		], true);

		// Update meta blob
		$this->blobStore->metaWrite($result->identifier(), $this->buildEntityMeta($result));

		// update cache
		$this->serviceEntityCache[$result->identifier()] = $result;

		return $bytes;
	}

	/**
	 * Build metadata array for an entity to store in .meta file
	 *
	 * @param EntityResource $node The entity node
	 * @return array Metadata array
	 */
	protected function buildEntityMeta(EntityResource $node): array {
		return [
			'tid' => $this->serviceTenantId,
			'uid' => $this->serviceUserId,
			'cid' => $node->collection(),
			'nid' => $node->identifier(),
			'created' => $node->created()?->getTimestamp() !== null ? (((int) $node->created()?->format('U')) * 1000) + (int) $node->created()?->format('v') : null,
			'modified' => $node->modified()?->getTimestamp() !== null ? (((int) $node->modified()?->format('U')) * 1000) + (int) $node->modified()?->format('v') : null,
			'size' => $node->getProperties()->size(),
			'label' => $node->getProperties()->getLabel(),
			'mime' => $node->getProperties()->getMime(),
			'format' => $node->getProperties()->getFormat(),
		];
	}
}