/**
 * OPFS (Origin Private File System) Storage Adapter
 * Provides persistent storage for the vector database using the Origin Private File System API
 */
import { BaseStorage, NOUNS_DIR, VERBS_DIR, METADATA_DIR, NOUN_METADATA_DIR, VERB_METADATA_DIR, INDEX_DIR } from '../baseStorage.js';
import '../../types/fileSystemTypes.js';
/**
 * Helper function to safely get a file from a FileSystemHandle
 * This is needed because TypeScript doesn't recognize that a FileSystemHandle
 * can be a FileSystemFileHandle which has the getFile method
 */
async function safeGetFile(handle) {
    // Type cast to any to avoid TypeScript error
    return handle.getFile();
}
// Root directory name for OPFS storage
const ROOT_DIR = 'opfs-vector-db';
/**
 * OPFS storage adapter for browser environments
 * Uses the Origin Private File System API to store data persistently
 */
export class OPFSStorage extends BaseStorage {
    constructor() {
        super();
        this.rootDir = null;
        this.nounsDir = null;
        this.verbsDir = null;
        this.metadataDir = null;
        this.nounMetadataDir = null;
        this.verbMetadataDir = null;
        this.indexDir = null;
        this.isAvailable = false;
        this.isPersistentRequested = false;
        this.isPersistentGranted = false;
        this.statistics = null;
        this.activeLocks = new Set();
        this.lockPrefix = 'opfs-lock-';
        // Check if OPFS is available
        this.isAvailable =
            typeof navigator !== 'undefined' &&
                'storage' in navigator &&
                'getDirectory' in navigator.storage;
    }
    /**
     * Initialize the storage adapter
     */
    async init() {
        if (this.isInitialized) {
            return;
        }
        if (!this.isAvailable) {
            throw new Error('Origin Private File System is not available in this environment');
        }
        try {
            // Get the root directory
            const root = await navigator.storage.getDirectory();
            // Create or get our app's root directory
            this.rootDir = await root.getDirectoryHandle(ROOT_DIR, { create: true });
            // Create or get nouns directory
            this.nounsDir = await this.rootDir.getDirectoryHandle(NOUNS_DIR, {
                create: true
            });
            // Create or get verbs directory
            this.verbsDir = await this.rootDir.getDirectoryHandle(VERBS_DIR, {
                create: true
            });
            // Create or get metadata directory
            this.metadataDir = await this.rootDir.getDirectoryHandle(METADATA_DIR, {
                create: true
            });
            // Create or get noun metadata directory
            this.nounMetadataDir = await this.rootDir.getDirectoryHandle(NOUN_METADATA_DIR, {
                create: true
            });
            // Create or get verb metadata directory
            this.verbMetadataDir = await this.rootDir.getDirectoryHandle(VERB_METADATA_DIR, {
                create: true
            });
            // Create or get index directory
            this.indexDir = await this.rootDir.getDirectoryHandle(INDEX_DIR, {
                create: true
            });
            this.isInitialized = true;
        }
        catch (error) {
            console.error('Failed to initialize OPFS storage:', error);
            throw new Error(`Failed to initialize OPFS storage: ${error}`);
        }
    }
    /**
     * Check if OPFS is available in the current environment
     */
    isOPFSAvailable() {
        return this.isAvailable;
    }
    /**
     * Request persistent storage permission from the user
     * @returns Promise that resolves to true if permission was granted, false otherwise
     */
    async requestPersistentStorage() {
        if (!this.isAvailable) {
            console.warn('Cannot request persistent storage: OPFS is not available');
            return false;
        }
        try {
            // Check if persistence is already granted
            this.isPersistentGranted = await navigator.storage.persisted();
            if (!this.isPersistentGranted) {
                // Request permission for persistent storage
                this.isPersistentGranted = await navigator.storage.persist();
            }
            this.isPersistentRequested = true;
            return this.isPersistentGranted;
        }
        catch (error) {
            console.warn('Failed to request persistent storage:', error);
            return false;
        }
    }
    /**
     * Check if persistent storage is granted
     * @returns Promise that resolves to true if persistent storage is granted, false otherwise
     */
    async isPersistent() {
        if (!this.isAvailable) {
            return false;
        }
        try {
            this.isPersistentGranted = await navigator.storage.persisted();
            return this.isPersistentGranted;
        }
        catch (error) {
            console.warn('Failed to check persistent storage status:', error);
            return false;
        }
    }
    /**
     * Save a noun to storage
     */
    async saveNoun_internal(noun) {
        await this.ensureInitialized();
        try {
            // Convert connections Map to a serializable format
            const serializableNoun = {
                ...noun,
                connections: this.mapToObject(noun.connections, (set) => Array.from(set))
            };
            // Create or get the file for this noun
            const fileHandle = await this.nounsDir.getFileHandle(`${noun.id}.json`, {
                create: true
            });
            // Write the noun data to the file
            const writable = await fileHandle.createWritable();
            await writable.write(JSON.stringify(serializableNoun));
            await writable.close();
        }
        catch (error) {
            console.error(`Failed to save noun ${noun.id}:`, error);
            throw new Error(`Failed to save noun ${noun.id}: ${error}`);
        }
    }
    /**
     * Get a noun from storage
     */
    async getNoun_internal(id) {
        await this.ensureInitialized();
        try {
            // Get the file handle for this noun
            const fileHandle = await this.nounsDir.getFileHandle(`${id}.json`);
            // Read the noun data from the file
            const file = await fileHandle.getFile();
            const text = await file.text();
            const data = JSON.parse(text);
            // Convert serialized connections back to Map<number, Set<string>>
            const connections = new Map();
            for (const [level, nounIds] of Object.entries(data.connections)) {
                connections.set(Number(level), new Set(nounIds));
            }
            return {
                id: data.id,
                vector: data.vector,
                connections,
                level: data.level || 0
            };
        }
        catch (error) {
            // Noun not found or other error
            return null;
        }
    }
    /**
     * Get nouns by noun type (internal implementation)
     * @param nounType The noun type to filter by
     * @returns Promise that resolves to an array of nouns of the specified noun type
     */
    async getNounsByNounType_internal(nounType) {
        return this.getNodesByNounType(nounType);
    }
    /**
     * Get nodes by noun type
     * @param nounType The noun type to filter by
     * @returns Promise that resolves to an array of nodes of the specified noun type
     */
    async getNodesByNounType(nounType) {
        await this.ensureInitialized();
        const nodes = [];
        try {
            // Iterate through all files in the nouns directory
            for await (const [name, handle] of this.nounsDir.entries()) {
                if (handle.kind === 'file') {
                    try {
                        // Read the node data from the file
                        const file = await safeGetFile(handle);
                        const text = await file.text();
                        const data = JSON.parse(text);
                        // Get the metadata to check the noun type
                        const metadata = await this.getMetadata(data.id);
                        // Include the node if its noun type matches the requested type
                        if (metadata && metadata.noun === nounType) {
                            // Convert serialized connections back to Map<number, Set<string>>
                            const connections = new Map();
                            for (const [level, nodeIds] of Object.entries(data.connections)) {
                                connections.set(Number(level), new Set(nodeIds));
                            }
                            nodes.push({
                                id: data.id,
                                vector: data.vector,
                                connections,
                                level: data.level || 0
                            });
                        }
                    }
                    catch (error) {
                        console.error(`Error reading node file ${name}:`, error);
                    }
                }
            }
        }
        catch (error) {
            console.error('Error reading nouns directory:', error);
        }
        return nodes;
    }
    /**
     * Delete a noun from storage (internal implementation)
     */
    async deleteNoun_internal(id) {
        return this.deleteNode(id);
    }
    /**
     * Delete a node from storage
     */
    async deleteNode(id) {
        await this.ensureInitialized();
        try {
            await this.nounsDir.removeEntry(`${id}.json`);
        }
        catch (error) {
            // Ignore NotFoundError, which means the file doesn't exist
            if (error.name !== 'NotFoundError') {
                console.error(`Error deleting node ${id}:`, error);
                throw error;
            }
        }
    }
    /**
     * Save a verb to storage (internal implementation)
     */
    async saveVerb_internal(verb) {
        return this.saveEdge(verb);
    }
    /**
     * Save an edge to storage
     */
    async saveEdge(edge) {
        await this.ensureInitialized();
        try {
            // Convert connections Map to a serializable format
            const serializableEdge = {
                ...edge,
                connections: this.mapToObject(edge.connections, (set) => Array.from(set))
            };
            // Create or get the file for this verb
            const fileHandle = await this.verbsDir.getFileHandle(`${edge.id}.json`, {
                create: true
            });
            // Write the verb data to the file
            const writable = await fileHandle.createWritable();
            await writable.write(JSON.stringify(serializableEdge));
            await writable.close();
        }
        catch (error) {
            console.error(`Failed to save edge ${edge.id}:`, error);
            throw new Error(`Failed to save edge ${edge.id}: ${error}`);
        }
    }
    /**
     * Get a verb from storage (internal implementation)
     */
    async getVerb_internal(id) {
        return this.getEdge(id);
    }
    /**
     * Get an edge from storage
     */
    async getEdge(id) {
        await this.ensureInitialized();
        try {
            // Get the file handle for this edge
            const fileHandle = await this.verbsDir.getFileHandle(`${id}.json`);
            // Read the edge data from the file
            const file = await fileHandle.getFile();
            const text = await file.text();
            const data = JSON.parse(text);
            // Convert serialized connections back to Map<number, Set<string>>
            const connections = new Map();
            for (const [level, nodeIds] of Object.entries(data.connections)) {
                connections.set(Number(level), new Set(nodeIds));
            }
            // Create default timestamp if not present
            const defaultTimestamp = {
                seconds: Math.floor(Date.now() / 1000),
                nanoseconds: (Date.now() % 1000) * 1000000
            };
            // Create default createdBy if not present
            const defaultCreatedBy = {
                augmentation: 'unknown',
                version: '1.0'
            };
            return {
                id: data.id,
                vector: data.vector,
                connections
            };
        }
        catch (error) {
            // Edge not found or other error
            return null;
        }
    }
    /**
     * Get all edges from storage
     */
    async getAllEdges() {
        await this.ensureInitialized();
        const allEdges = [];
        try {
            // Iterate through all files in the verbs directory
            for await (const [name, handle] of this.verbsDir.entries()) {
                if (handle.kind === 'file') {
                    try {
                        // Read the edge data from the file
                        const file = await safeGetFile(handle);
                        const text = await file.text();
                        const data = JSON.parse(text);
                        // Convert serialized connections back to Map<number, Set<string>>
                        const connections = new Map();
                        for (const [level, nodeIds] of Object.entries(data.connections)) {
                            connections.set(Number(level), new Set(nodeIds));
                        }
                        // Create default timestamp if not present
                        const defaultTimestamp = {
                            seconds: Math.floor(Date.now() / 1000),
                            nanoseconds: (Date.now() % 1000) * 1000000
                        };
                        // Create default createdBy if not present
                        const defaultCreatedBy = {
                            augmentation: 'unknown',
                            version: '1.0'
                        };
                        allEdges.push({
                            id: data.id,
                            vector: data.vector,
                            connections
                        });
                    }
                    catch (error) {
                        console.error(`Error reading edge file ${name}:`, error);
                    }
                }
            }
        }
        catch (error) {
            console.error('Error reading verbs directory:', error);
        }
        return allEdges;
    }
    /**
     * Get verbs by source (internal implementation)
     */
    async getVerbsBySource_internal(sourceId) {
        // Use the paginated approach to properly handle HNSWVerb to GraphVerb conversion
        const result = await this.getVerbsWithPagination({
            filter: { sourceId: [sourceId] },
            limit: Number.MAX_SAFE_INTEGER // Get all matching results
        });
        return result.items;
    }
    /**
     * Get edges by source
     */
    async getEdgesBySource(sourceId) {
        // This method is deprecated and would require loading metadata for each edge
        // For now, return empty array since this is not efficiently implementable with new storage pattern
        console.warn('getEdgesBySource is deprecated and not efficiently supported in new storage pattern');
        return [];
    }
    /**
     * Get verbs by target (internal implementation)
     */
    async getVerbsByTarget_internal(targetId) {
        // Use the paginated approach to properly handle HNSWVerb to GraphVerb conversion
        const result = await this.getVerbsWithPagination({
            filter: { targetId: [targetId] },
            limit: Number.MAX_SAFE_INTEGER // Get all matching results
        });
        return result.items;
    }
    /**
     * Get edges by target
     */
    async getEdgesByTarget(targetId) {
        // This method is deprecated and would require loading metadata for each edge
        // For now, return empty array since this is not efficiently implementable with new storage pattern
        console.warn('getEdgesByTarget is deprecated and not efficiently supported in new storage pattern');
        return [];
    }
    /**
     * Get verbs by type (internal implementation)
     */
    async getVerbsByType_internal(type) {
        // Use the paginated approach to properly handle HNSWVerb to GraphVerb conversion
        const result = await this.getVerbsWithPagination({
            filter: { verbType: [type] },
            limit: Number.MAX_SAFE_INTEGER // Get all matching results
        });
        return result.items;
    }
    /**
     * Get edges by type
     */
    async getEdgesByType(type) {
        // This method is deprecated and would require loading metadata for each edge
        // For now, return empty array since this is not efficiently implementable with new storage pattern
        console.warn('getEdgesByType is deprecated and not efficiently supported in new storage pattern');
        return [];
    }
    /**
     * Delete a verb from storage (internal implementation)
     */
    async deleteVerb_internal(id) {
        return this.deleteEdge(id);
    }
    /**
     * Delete an edge from storage
     */
    async deleteEdge(id) {
        await this.ensureInitialized();
        try {
            await this.verbsDir.removeEntry(`${id}.json`);
        }
        catch (error) {
            // Ignore NotFoundError, which means the file doesn't exist
            if (error.name !== 'NotFoundError') {
                console.error(`Error deleting edge ${id}:`, error);
                throw error;
            }
        }
    }
    /**
     * Save metadata to storage
     */
    async saveMetadata(id, metadata) {
        await this.ensureInitialized();
        try {
            // Create or get the file for this metadata
            const fileHandle = await this.metadataDir.getFileHandle(`${id}.json`, {
                create: true
            });
            // Write the metadata to the file
            const writable = await fileHandle.createWritable();
            await writable.write(JSON.stringify(metadata));
            await writable.close();
        }
        catch (error) {
            console.error(`Failed to save metadata ${id}:`, error);
            throw new Error(`Failed to save metadata ${id}: ${error}`);
        }
    }
    /**
     * Get metadata from storage
     */
    async getMetadata(id) {
        await this.ensureInitialized();
        try {
            // Get the file handle for this metadata
            const fileHandle = await this.metadataDir.getFileHandle(`${id}.json`);
            // Read the metadata from the file
            const file = await fileHandle.getFile();
            const text = await file.text();
            return JSON.parse(text);
        }
        catch (error) {
            // Metadata not found or other error
            return null;
        }
    }
    /**
     * Get multiple metadata objects in batches (CRITICAL: Prevents socket exhaustion)
     * OPFS implementation uses controlled concurrency for file operations
     */
    async getMetadataBatch(ids) {
        await this.ensureInitialized();
        const results = new Map();
        const batchSize = 10; // Process 10 files at a time
        // Process in batches to avoid overwhelming OPFS
        for (let i = 0; i < ids.length; i += batchSize) {
            const batch = ids.slice(i, i + batchSize);
            const batchPromises = batch.map(async (id) => {
                try {
                    const metadata = await this.getMetadata(id);
                    return { id, metadata };
                }
                catch (error) {
                    console.debug(`Failed to read metadata for ${id}:`, error);
                    return { id, metadata: null };
                }
            });
            const batchResults = await Promise.all(batchPromises);
            for (const { id, metadata } of batchResults) {
                if (metadata !== null) {
                    results.set(id, metadata);
                }
            }
            // Small yield between batches
            await new Promise(resolve => setImmediate(resolve));
        }
        return results;
    }
    /**
     * Save verb metadata to storage
     */
    async saveVerbMetadata(id, metadata) {
        await this.ensureInitialized();
        const fileName = `${id}.json`;
        const fileHandle = await this.verbMetadataDir.getFileHandle(fileName, { create: true });
        const writable = await fileHandle.createWritable();
        await writable.write(JSON.stringify(metadata, null, 2));
        await writable.close();
    }
    /**
     * Get verb metadata from storage
     */
    async getVerbMetadata(id) {
        await this.ensureInitialized();
        const fileName = `${id}.json`;
        try {
            const fileHandle = await this.verbMetadataDir.getFileHandle(fileName);
            const file = await safeGetFile(fileHandle);
            const text = await file.text();
            return JSON.parse(text);
        }
        catch (error) {
            if (error.name !== 'NotFoundError') {
                console.error(`Error reading verb metadata ${id}:`, error);
            }
            return null;
        }
    }
    /**
     * Save noun metadata to storage
     */
    async saveNounMetadata(id, metadata) {
        await this.ensureInitialized();
        const fileName = `${id}.json`;
        const fileHandle = await this.nounMetadataDir.getFileHandle(fileName, { create: true });
        const writable = await fileHandle.createWritable();
        await writable.write(JSON.stringify(metadata, null, 2));
        await writable.close();
    }
    /**
     * Get noun metadata from storage
     */
    async getNounMetadata(id) {
        await this.ensureInitialized();
        const fileName = `${id}.json`;
        try {
            const fileHandle = await this.nounMetadataDir.getFileHandle(fileName);
            const file = await safeGetFile(fileHandle);
            const text = await file.text();
            return JSON.parse(text);
        }
        catch (error) {
            if (error.name !== 'NotFoundError') {
                console.error(`Error reading noun metadata ${id}:`, error);
            }
            return null;
        }
    }
    /**
     * Clear all data from storage
     */
    async clear() {
        await this.ensureInitialized();
        // Helper function to remove all files in a directory
        const removeDirectoryContents = async (dirHandle) => {
            try {
                for await (const [name, handle] of dirHandle.entries()) {
                    // Use recursive option to handle directories that may contain files
                    await dirHandle.removeEntry(name, { recursive: true });
                }
            }
            catch (error) {
                console.error(`Error removing directory contents:`, error);
                throw error;
            }
        };
        try {
            // Remove all files in the nouns directory
            await removeDirectoryContents(this.nounsDir);
            // Remove all files in the verbs directory
            await removeDirectoryContents(this.verbsDir);
            // Remove all files in the metadata directory
            await removeDirectoryContents(this.metadataDir);
            // Remove all files in the noun metadata directory
            await removeDirectoryContents(this.nounMetadataDir);
            // Remove all files in the verb metadata directory
            await removeDirectoryContents(this.verbMetadataDir);
            // Remove all files in the index directory
            await removeDirectoryContents(this.indexDir);
            // Clear the statistics cache
            this.statisticsCache = null;
            this.statisticsModified = false;
        }
        catch (error) {
            console.error('Error clearing storage:', error);
            throw error;
        }
    }
    /**
     * Get information about storage usage and capacity
     */
    async getStorageStatus() {
        await this.ensureInitialized();
        try {
            // Calculate the total size of all files in the storage directories
            let totalSize = 0;
            // Helper function to calculate directory size
            const calculateDirSize = async (dirHandle) => {
                let size = 0;
                try {
                    for await (const [name, handle] of dirHandle.entries()) {
                        if (handle.kind === 'file') {
                            const file = await handle.getFile();
                            size += file.size;
                        }
                        else if (handle.kind === 'directory') {
                            size += await calculateDirSize(handle);
                        }
                    }
                }
                catch (error) {
                    console.warn(`Error calculating size for directory:`, error);
                }
                return size;
            };
            // Helper function to count files in a directory
            const countFilesInDirectory = async (dirHandle) => {
                let count = 0;
                try {
                    for await (const [name, handle] of dirHandle.entries()) {
                        if (handle.kind === 'file') {
                            count++;
                        }
                    }
                }
                catch (error) {
                    console.warn(`Error counting files in directory:`, error);
                }
                return count;
            };
            // Calculate size for each directory
            if (this.nounsDir) {
                totalSize += await calculateDirSize(this.nounsDir);
            }
            if (this.verbsDir) {
                totalSize += await calculateDirSize(this.verbsDir);
            }
            if (this.metadataDir) {
                totalSize += await calculateDirSize(this.metadataDir);
            }
            if (this.indexDir) {
                totalSize += await calculateDirSize(this.indexDir);
            }
            // Get storage quota information using the Storage API
            let quota = null;
            let details = {
                isPersistent: await this.isPersistent(),
                nounTypes: {}
            };
            try {
                if (navigator.storage && navigator.storage.estimate) {
                    const estimate = await navigator.storage.estimate();
                    quota = estimate.quota || null;
                    details = {
                        ...details,
                        usage: estimate.usage,
                        quota: estimate.quota,
                        freePercentage: estimate.quota
                            ? ((estimate.quota - (estimate.usage || 0)) / estimate.quota) *
                                100
                            : null
                    };
                }
            }
            catch (error) {
                console.warn('Unable to get storage estimate:', error);
            }
            // Count files in each directory
            if (this.nounsDir) {
                details.nounsCount = await countFilesInDirectory(this.nounsDir);
            }
            if (this.verbsDir) {
                details.verbsCount = await countFilesInDirectory(this.verbsDir);
            }
            if (this.metadataDir) {
                details.metadataCount = await countFilesInDirectory(this.metadataDir);
            }
            // Count nouns by type using metadata
            const nounTypeCounts = {};
            if (this.metadataDir) {
                for await (const [name, handle] of this.metadataDir.entries()) {
                    if (handle.kind === 'file') {
                        try {
                            const file = await safeGetFile(handle);
                            const text = await file.text();
                            const metadata = JSON.parse(text);
                            if (metadata.noun) {
                                nounTypeCounts[metadata.noun] =
                                    (nounTypeCounts[metadata.noun] || 0) + 1;
                            }
                        }
                        catch (error) {
                            console.error(`Error reading metadata file ${name}:`, error);
                        }
                    }
                }
            }
            details.nounTypes = nounTypeCounts;
            return {
                type: 'opfs',
                used: totalSize,
                quota,
                details
            };
        }
        catch (error) {
            console.error('Failed to get storage status:', error);
            return {
                type: 'opfs',
                used: 0,
                quota: null,
                details: { error: String(error) }
            };
        }
    }
    /**
     * Get the statistics key for a specific date
     * @param date The date to get the key for
     * @returns The statistics key for the specified date
     */
    getStatisticsKeyForDate(date) {
        const year = date.getUTCFullYear();
        const month = String(date.getUTCMonth() + 1).padStart(2, '0');
        const day = String(date.getUTCDate()).padStart(2, '0');
        return `statistics_${year}${month}${day}.json`;
    }
    /**
     * Get the current statistics key
     * @returns The current statistics key
     */
    getCurrentStatisticsKey() {
        return this.getStatisticsKeyForDate(new Date());
    }
    /**
     * Get the legacy statistics key (for backward compatibility)
     * @returns The legacy statistics key
     */
    getLegacyStatisticsKey() {
        return 'statistics.json';
    }
    /**
     * Acquire a browser-based lock for coordinating operations across multiple tabs
     * @param lockKey The key to lock on
     * @param ttl Time to live for the lock in milliseconds (default: 30 seconds)
     * @returns Promise that resolves to true if lock was acquired, false otherwise
     */
    async acquireLock(lockKey, ttl = 30000) {
        if (typeof localStorage === 'undefined') {
            console.warn('localStorage not available, proceeding without lock');
            return false;
        }
        const lockStorageKey = `${this.lockPrefix}${lockKey}`;
        const lockValue = `${Date.now()}_${Math.random()}_${window.location.href}`;
        const expiresAt = Date.now() + ttl;
        try {
            // Check if lock already exists and is still valid
            const existingLock = localStorage.getItem(lockStorageKey);
            if (existingLock) {
                try {
                    const lockInfo = JSON.parse(existingLock);
                    if (lockInfo.expiresAt > Date.now()) {
                        // Lock exists and is still valid
                        return false;
                    }
                }
                catch (error) {
                    // Invalid lock data, we can proceed to create a new lock
                    console.warn(`Invalid lock data for ${lockStorageKey}:`, error);
                }
            }
            // Try to create the lock
            const lockInfo = {
                lockValue,
                expiresAt,
                tabId: window.location.href,
                timestamp: Date.now()
            };
            localStorage.setItem(lockStorageKey, JSON.stringify(lockInfo));
            // Add to active locks for cleanup
            this.activeLocks.add(lockKey);
            // Schedule automatic cleanup when lock expires
            setTimeout(() => {
                this.releaseLock(lockKey, lockValue).catch((error) => {
                    console.warn(`Failed to auto-release expired lock ${lockKey}:`, error);
                });
            }, ttl);
            return true;
        }
        catch (error) {
            console.warn(`Failed to acquire lock ${lockKey}:`, error);
            return false;
        }
    }
    /**
     * Release a browser-based lock
     * @param lockKey The key to unlock
     * @param lockValue The value used when acquiring the lock (for verification)
     * @returns Promise that resolves when lock is released
     */
    async releaseLock(lockKey, lockValue) {
        if (typeof localStorage === 'undefined') {
            return;
        }
        const lockStorageKey = `${this.lockPrefix}${lockKey}`;
        try {
            // If lockValue is provided, verify it matches before releasing
            if (lockValue) {
                const existingLock = localStorage.getItem(lockStorageKey);
                if (existingLock) {
                    try {
                        const lockInfo = JSON.parse(existingLock);
                        if (lockInfo.lockValue !== lockValue) {
                            // Lock was acquired by someone else, don't release it
                            return;
                        }
                    }
                    catch (error) {
                        // Invalid lock data, remove it
                        localStorage.removeItem(lockStorageKey);
                        this.activeLocks.delete(lockKey);
                        return;
                    }
                }
            }
            // Remove the lock
            localStorage.removeItem(lockStorageKey);
            // Remove from active locks
            this.activeLocks.delete(lockKey);
        }
        catch (error) {
            console.warn(`Failed to release lock ${lockKey}:`, error);
        }
    }
    /**
     * Clean up expired locks from localStorage
     */
    async cleanupExpiredLocks() {
        if (typeof localStorage === 'undefined') {
            return;
        }
        try {
            const now = Date.now();
            const keysToRemove = [];
            // Iterate through localStorage to find expired locks
            for (let i = 0; i < localStorage.length; i++) {
                const key = localStorage.key(i);
                if (key && key.startsWith(this.lockPrefix)) {
                    try {
                        const lockData = localStorage.getItem(key);
                        if (lockData) {
                            const lockInfo = JSON.parse(lockData);
                            if (lockInfo.expiresAt <= now) {
                                keysToRemove.push(key);
                                const lockKey = key.replace(this.lockPrefix, '');
                                this.activeLocks.delete(lockKey);
                            }
                        }
                    }
                    catch (error) {
                        // Invalid lock data, mark for removal
                        keysToRemove.push(key);
                    }
                }
            }
            // Remove expired locks
            keysToRemove.forEach((key) => {
                localStorage.removeItem(key);
            });
            if (keysToRemove.length > 0) {
                console.log(`Cleaned up ${keysToRemove.length} expired locks`);
            }
        }
        catch (error) {
            console.warn('Failed to cleanup expired locks:', error);
        }
    }
    /**
     * Save statistics data to storage with browser-based locking
     * @param statistics The statistics data to save
     */
    async saveStatisticsData(statistics) {
        const lockKey = 'statistics';
        const lockAcquired = await this.acquireLock(lockKey, 10000); // 10 second timeout
        if (!lockAcquired) {
            console.warn('Failed to acquire lock for statistics update, proceeding without lock');
        }
        try {
            // Get existing statistics to merge with new data
            const existingStats = await this.getStatisticsData();
            let mergedStats;
            if (existingStats) {
                // Merge statistics data
                mergedStats = {
                    nounCount: {
                        ...existingStats.nounCount,
                        ...statistics.nounCount
                    },
                    verbCount: {
                        ...existingStats.verbCount,
                        ...statistics.verbCount
                    },
                    metadataCount: {
                        ...existingStats.metadataCount,
                        ...statistics.metadataCount
                    },
                    hnswIndexSize: Math.max(statistics.hnswIndexSize || 0, existingStats.hnswIndexSize || 0),
                    lastUpdated: new Date().toISOString()
                };
            }
            else {
                // No existing statistics, use new ones
                mergedStats = {
                    ...statistics,
                    lastUpdated: new Date().toISOString()
                };
            }
            // Create a deep copy to avoid reference issues
            this.statistics = {
                nounCount: { ...mergedStats.nounCount },
                verbCount: { ...mergedStats.verbCount },
                metadataCount: { ...mergedStats.metadataCount },
                hnswIndexSize: mergedStats.hnswIndexSize,
                lastUpdated: mergedStats.lastUpdated
            };
            // Ensure the root directory is initialized
            await this.ensureInitialized();
            // Get or create the index directory
            if (!this.indexDir) {
                throw new Error('Index directory not initialized');
            }
            // Get the current statistics key
            const currentKey = this.getCurrentStatisticsKey();
            // Create a file for the statistics data
            const fileHandle = await this.indexDir.getFileHandle(currentKey, {
                create: true
            });
            // Create a writable stream
            const writable = await fileHandle.createWritable();
            // Write the statistics data to the file
            await writable.write(JSON.stringify(this.statistics, null, 2));
            // Close the stream
            await writable.close();
            // Also update the legacy key for backward compatibility, but less frequently
            if (Math.random() < 0.1) {
                const legacyKey = this.getLegacyStatisticsKey();
                const legacyFileHandle = await this.indexDir.getFileHandle(legacyKey, {
                    create: true
                });
                const legacyWritable = await legacyFileHandle.createWritable();
                await legacyWritable.write(JSON.stringify(this.statistics, null, 2));
                await legacyWritable.close();
            }
        }
        catch (error) {
            console.error('Failed to save statistics data:', error);
            throw new Error(`Failed to save statistics data: ${error}`);
        }
        finally {
            if (lockAcquired) {
                await this.releaseLock(lockKey);
            }
        }
    }
    /**
     * Get statistics data from storage
     * @returns Promise that resolves to the statistics data or null if not found
     */
    async getStatisticsData() {
        // If we have cached statistics, return a deep copy
        if (this.statistics) {
            return {
                nounCount: { ...this.statistics.nounCount },
                verbCount: { ...this.statistics.verbCount },
                metadataCount: { ...this.statistics.metadataCount },
                hnswIndexSize: this.statistics.hnswIndexSize,
                lastUpdated: this.statistics.lastUpdated
            };
        }
        try {
            // Ensure the root directory is initialized
            await this.ensureInitialized();
            if (!this.indexDir) {
                throw new Error('Index directory not initialized');
            }
            // First try to get statistics from today's file
            const currentKey = this.getCurrentStatisticsKey();
            try {
                const fileHandle = await this.indexDir.getFileHandle(currentKey, {
                    create: false
                });
                const file = await fileHandle.getFile();
                const text = await file.text();
                this.statistics = JSON.parse(text);
                if (this.statistics) {
                    return {
                        nounCount: { ...this.statistics.nounCount },
                        verbCount: { ...this.statistics.verbCount },
                        metadataCount: { ...this.statistics.metadataCount },
                        hnswIndexSize: this.statistics.hnswIndexSize,
                        lastUpdated: this.statistics.lastUpdated
                    };
                }
            }
            catch (error) {
                // If today's file doesn't exist, try yesterday's file
                const yesterday = new Date();
                yesterday.setDate(yesterday.getDate() - 1);
                const yesterdayKey = this.getStatisticsKeyForDate(yesterday);
                try {
                    const fileHandle = await this.indexDir.getFileHandle(yesterdayKey, {
                        create: false
                    });
                    const file = await fileHandle.getFile();
                    const text = await file.text();
                    this.statistics = JSON.parse(text);
                    if (this.statistics) {
                        return {
                            nounCount: { ...this.statistics.nounCount },
                            verbCount: { ...this.statistics.verbCount },
                            metadataCount: { ...this.statistics.metadataCount },
                            hnswIndexSize: this.statistics.hnswIndexSize,
                            lastUpdated: this.statistics.lastUpdated
                        };
                    }
                }
                catch (error) {
                    // If yesterday's file doesn't exist, try the legacy file
                    const legacyKey = this.getLegacyStatisticsKey();
                    try {
                        const fileHandle = await this.indexDir.getFileHandle(legacyKey, {
                            create: false
                        });
                        const file = await fileHandle.getFile();
                        const text = await file.text();
                        this.statistics = JSON.parse(text);
                        if (this.statistics) {
                            return {
                                nounCount: { ...this.statistics.nounCount },
                                verbCount: { ...this.statistics.verbCount },
                                metadataCount: { ...this.statistics.metadataCount },
                                hnswIndexSize: this.statistics.hnswIndexSize,
                                lastUpdated: this.statistics.lastUpdated
                            };
                        }
                    }
                    catch (error) {
                        // If the legacy file doesn't exist either, return null
                        return null;
                    }
                }
            }
            // If we get here and statistics is null, return default statistics
            return this.statistics ? this.statistics : null;
        }
        catch (error) {
            console.error('Failed to get statistics data:', error);
            throw new Error(`Failed to get statistics data: ${error}`);
        }
    }
    /**
     * Get nouns with pagination support
     * @param options Pagination and filter options
     * @returns Promise that resolves to a paginated result of nouns
     */
    async getNounsWithPagination(options = {}) {
        await this.ensureInitialized();
        const limit = options.limit || 100;
        const cursor = options.cursor;
        // Get all noun files
        const nounFiles = [];
        if (this.nounsDir) {
            for await (const [name, handle] of this.nounsDir.entries()) {
                if (handle.kind === 'file' && name.endsWith('.json')) {
                    nounFiles.push(name);
                }
            }
        }
        // Sort files for consistent ordering
        nounFiles.sort();
        // Apply cursor-based pagination
        let startIndex = 0;
        if (cursor) {
            const cursorIndex = nounFiles.findIndex(file => file > cursor);
            if (cursorIndex >= 0) {
                startIndex = cursorIndex;
            }
        }
        // Get the subset of files for this page
        const pageFiles = nounFiles.slice(startIndex, startIndex + limit);
        // Load nouns from files
        const items = [];
        for (const fileName of pageFiles) {
            const id = fileName.replace('.json', '');
            const noun = await this.getNoun_internal(id);
            if (noun) {
                // Apply filters if provided
                if (options.filter) {
                    const metadata = await this.getNounMetadata(id);
                    // Filter by noun type
                    if (options.filter.nounType) {
                        const nounTypes = Array.isArray(options.filter.nounType)
                            ? options.filter.nounType
                            : [options.filter.nounType];
                        if (metadata && !nounTypes.includes(metadata.type || metadata.noun)) {
                            continue;
                        }
                    }
                    // Filter by service
                    if (options.filter.service) {
                        const services = Array.isArray(options.filter.service)
                            ? options.filter.service
                            : [options.filter.service];
                        if (metadata && !services.includes(metadata.createdBy?.augmentation)) {
                            continue;
                        }
                    }
                    // Filter by metadata
                    if (options.filter.metadata) {
                        if (!metadata)
                            continue;
                        let matches = true;
                        for (const [key, value] of Object.entries(options.filter.metadata)) {
                            if (metadata[key] !== value) {
                                matches = false;
                                break;
                            }
                        }
                        if (!matches)
                            continue;
                    }
                }
                items.push(noun);
            }
        }
        // Determine if there are more items
        const hasMore = startIndex + limit < nounFiles.length;
        // Generate next cursor if there are more items
        const nextCursor = hasMore && pageFiles.length > 0
            ? pageFiles[pageFiles.length - 1]
            : undefined;
        return {
            items,
            totalCount: nounFiles.length,
            hasMore,
            nextCursor
        };
    }
    /**
     * Get verbs with pagination support
     * @param options Pagination and filter options
     * @returns Promise that resolves to a paginated result of verbs
     */
    async getVerbsWithPagination(options = {}) {
        await this.ensureInitialized();
        const limit = options.limit || 100;
        const cursor = options.cursor;
        // Get all verb files
        const verbFiles = [];
        if (this.verbsDir) {
            for await (const [name, handle] of this.verbsDir.entries()) {
                if (handle.kind === 'file' && name.endsWith('.json')) {
                    verbFiles.push(name);
                }
            }
        }
        // Sort files for consistent ordering
        verbFiles.sort();
        // Apply cursor-based pagination
        let startIndex = 0;
        if (cursor) {
            const cursorIndex = verbFiles.findIndex(file => file > cursor);
            if (cursorIndex >= 0) {
                startIndex = cursorIndex;
            }
        }
        // Get the subset of files for this page
        const pageFiles = verbFiles.slice(startIndex, startIndex + limit);
        // Load verbs from files and convert to GraphVerb
        const items = [];
        for (const fileName of pageFiles) {
            const id = fileName.replace('.json', '');
            const hnswVerb = await this.getVerb_internal(id);
            if (hnswVerb) {
                // Convert HNSWVerb to GraphVerb
                const graphVerb = await this.convertHNSWVerbToGraphVerb(hnswVerb);
                if (graphVerb) {
                    // Apply filters if provided
                    if (options.filter) {
                        // Filter by verb type
                        if (options.filter.verbType) {
                            const verbTypes = Array.isArray(options.filter.verbType)
                                ? options.filter.verbType
                                : [options.filter.verbType];
                            if (graphVerb.verb && !verbTypes.includes(graphVerb.verb)) {
                                continue;
                            }
                        }
                        // Filter by source ID
                        if (options.filter.sourceId) {
                            const sourceIds = Array.isArray(options.filter.sourceId)
                                ? options.filter.sourceId
                                : [options.filter.sourceId];
                            if (graphVerb.source && !sourceIds.includes(graphVerb.source)) {
                                continue;
                            }
                        }
                        // Filter by target ID
                        if (options.filter.targetId) {
                            const targetIds = Array.isArray(options.filter.targetId)
                                ? options.filter.targetId
                                : [options.filter.targetId];
                            if (graphVerb.target && !targetIds.includes(graphVerb.target)) {
                                continue;
                            }
                        }
                        // Filter by service
                        if (options.filter.service) {
                            const services = Array.isArray(options.filter.service)
                                ? options.filter.service
                                : [options.filter.service];
                            if (graphVerb.createdBy?.augmentation && !services.includes(graphVerb.createdBy.augmentation)) {
                                continue;
                            }
                        }
                        // Filter by metadata
                        if (options.filter.metadata && graphVerb.metadata) {
                            let matches = true;
                            for (const [key, value] of Object.entries(options.filter.metadata)) {
                                if (graphVerb.metadata[key] !== value) {
                                    matches = false;
                                    break;
                                }
                            }
                            if (!matches)
                                continue;
                        }
                    }
                    items.push(graphVerb);
                }
            }
        }
        // Determine if there are more items
        const hasMore = startIndex + limit < verbFiles.length;
        // Generate next cursor if there are more items
        const nextCursor = hasMore && pageFiles.length > 0
            ? pageFiles[pageFiles.length - 1]
            : undefined;
        return {
            items,
            totalCount: verbFiles.length,
            hasMore,
            nextCursor
        };
    }
}
//# sourceMappingURL=opfsStorage.js.map