{"version":3,"file":"networkStatus.mjs","sources":["../../../src/lib/utils/networkStatus.ts"],"sourcesContent":["/**\n * @file Network Status Utilities\n * @description Online/offline detection, connection quality monitoring,\n * and network-aware request handling\n */\n\nimport { globalEventBus } from './eventEmitter';\nimport { logger } from './logging';\n\n// ============================================================================\n// Types\n// ============================================================================\n\n/**\n * Network connection type\n */\nexport type ConnectionType =\n | 'wifi'\n | '4g'\n | '3g'\n | '2g'\n | 'slow-2g'\n | 'ethernet'\n | 'bluetooth'\n | 'cellular'\n | 'none'\n | 'unknown';\n\n/**\n * Network effective type (speed-based)\n */\nexport type EffectiveType = 'slow-2g' | '2g' | '3g' | '4g';\n\n/**\n * Network status information\n */\nexport interface NetworkStatus {\n /** Whether the browser is online */\n online: boolean;\n /** Connection type */\n type: ConnectionType;\n /** Effective connection type (based on measured speed) */\n effectiveType: EffectiveType;\n /** Downlink speed in Mbps */\n downlink: number;\n /** Round-trip time in ms */\n rtt: number;\n /** Whether data saver mode is enabled */\n saveData: boolean;\n /** Timestamp of last status update */\n timestamp: number;\n}\n\n/**\n * Network quality tier\n */\nexport type NetworkQuality = 'excellent' | 'good' | 'fair' | 'poor' | 'offline';\n\n/**\n * Network status change callback\n */\nexport type NetworkStatusCallback = (status: NetworkStatus) => void;\n\n/**\n * Network quality change callback\n */\nexport type NetworkQualityCallback = (quality: NetworkQuality) => void;\n\n/**\n * Network monitor configuration\n */\nexport interface NetworkMonitorConfig {\n /** Ping endpoint for connectivity check */\n pingEndpoint?: string;\n /** Ping interval in ms */\n pingInterval?: number;\n /** Ping timeout in ms */\n pingTimeout?: number;\n /** Enable periodic pinging */\n enablePing?: boolean;\n /** Downlink threshold for \"good\" quality (Mbps) */\n goodDownlinkThreshold?: number;\n /** RTT threshold for \"good\" quality (ms) */\n goodRttThreshold?: number;\n}\n\n// ============================================================================\n// Network Information API Types\n// ============================================================================\n\n/**\n * Network Information API types (not yet standard)\n */\ninterface NetworkInformation extends EventTarget {\n type?: ConnectionType;\n effectiveType?: EffectiveType;\n downlink?: number;\n downlinkMax?: number;\n rtt?: number;\n saveData?: boolean;\n onchange?: ((this: NetworkInformation, ev: Event) => void) | null;\n}\n\ninterface NavigatorWithConnection extends Navigator {\n connection?: NetworkInformation;\n mozConnection?: NetworkInformation;\n webkitConnection?: NetworkInformation;\n}\n\n// ============================================================================\n// Network Monitor\n// ============================================================================\n\n/**\n * Network status monitor with quality detection and event handling\n */\nexport class NetworkMonitor {\n private config: Required;\n private statusCallbacks = new Set();\n private qualityCallbacks = new Set();\n private currentStatus: NetworkStatus;\n private currentQuality: NetworkQuality = 'unknown' as NetworkQuality;\n private pingIntervalId: ReturnType | null = null;\n private disposed = false;\n\n constructor(config: NetworkMonitorConfig = {}) {\n this.config = {\n pingEndpoint: config.pingEndpoint ?? '/api/health',\n pingInterval: config.pingInterval ?? 30000,\n pingTimeout: config.pingTimeout ?? 5000,\n enablePing: config.enablePing ?? false,\n goodDownlinkThreshold: config.goodDownlinkThreshold ?? 1.5,\n goodRttThreshold: config.goodRttThreshold ?? 300,\n };\n\n this.currentStatus = this.getNetworkStatus();\n this.currentQuality = this.calculateQuality(this.currentStatus);\n\n this.setupListeners();\n }\n\n /**\n * Start monitoring\n */\n start(): void {\n if (this.config.enablePing && !this.pingIntervalId) {\n this.pingIntervalId = setInterval(() => { void this.ping(); }, this.config.pingInterval);\n // Initial ping\n void this.ping();\n }\n }\n\n /**\n * Stop monitoring\n */\n stop(): void {\n if (this.pingIntervalId) {\n clearInterval(this.pingIntervalId);\n this.pingIntervalId = null;\n }\n }\n\n /**\n * Perform connectivity ping\n */\n async ping(): Promise {\n if (!this.currentStatus.online) return false;\n\n const startTime = performance.now();\n\n try {\n const controller = new AbortController();\n const timeoutId = setTimeout(\n () => controller.abort(),\n this.config.pingTimeout\n );\n\n const response = await fetch(this.config.pingEndpoint, {\n method: 'HEAD',\n cache: 'no-store',\n signal: controller.signal,\n });\n\n clearTimeout(timeoutId);\n\n const endTime = performance.now();\n const latency = endTime - startTime;\n\n if (response.ok) {\n // Update RTT estimate\n this.currentStatus.rtt = latency;\n this.updateStatus();\n return true;\n }\n\n return false;\n } catch (error) {\n if (error instanceof Error && error.name === 'AbortError') {\n logger.debug('[Network] Ping timeout');\n }\n return false;\n }\n }\n\n /**\n * Get current status\n */\n getStatus(): NetworkStatus {\n return { ...this.currentStatus };\n }\n\n /**\n * Get current quality\n */\n getQuality(): NetworkQuality {\n return this.currentQuality;\n }\n\n /**\n * Check if online\n */\n isOnline(): boolean {\n return this.currentStatus.online;\n }\n\n /**\n * Check if connection is metered/slow\n */\n isSlowConnection(): boolean {\n return (\n this.currentStatus.saveData ||\n this.currentQuality === 'poor' ||\n this.currentStatus.effectiveType === '2g' ||\n this.currentStatus.effectiveType === 'slow-2g'\n );\n }\n\n /**\n * Subscribe to status changes\n */\n onStatusChange(callback: NetworkStatusCallback): () => void {\n this.statusCallbacks.add(callback);\n // Emit current status immediately\n callback(this.currentStatus);\n return () => this.statusCallbacks.delete(callback);\n }\n\n /**\n * Subscribe to quality changes\n */\n onQualityChange(callback: NetworkQualityCallback): () => void {\n this.qualityCallbacks.add(callback);\n // Emit current quality immediately\n callback(this.currentQuality);\n return () => this.qualityCallbacks.delete(callback);\n }\n\n /**\n * Wait for online status\n */\n async waitForOnline(timeout?: number): Promise {\n if (this.currentStatus.online) return true;\n\n return new Promise((resolve) => {\n let timeoutId: ReturnType | undefined;\n\n const unsubscribe = this.onStatusChange((status) => {\n if (status.online) {\n if (timeoutId) clearTimeout(timeoutId);\n unsubscribe();\n resolve(true);\n }\n });\n\n if (timeout !== undefined && timeout > 0) {\n timeoutId = setTimeout(() => {\n unsubscribe();\n resolve(false);\n }, timeout);\n }\n });\n }\n\n /**\n * Dispose resources\n */\n dispose(): void {\n if (this.disposed) return;\n this.disposed = true;\n\n this.stop();\n\n if (typeof window !== 'undefined') {\n window.removeEventListener('online', this.handleOnline);\n window.removeEventListener('offline', this.handleOffline);\n\n const connection = this.getConnection();\n if (connection) {\n connection.removeEventListener('change', this.handleConnectionChange);\n }\n }\n\n this.statusCallbacks.clear();\n this.qualityCallbacks.clear();\n }\n\n /**\n * Get the Network Information API connection object\n */\n private getConnection(): NetworkInformation | undefined {\n if (typeof navigator === 'undefined') return undefined;\n\n const nav = navigator as NavigatorWithConnection;\n return nav.connection ?? nav.mozConnection ?? nav.webkitConnection;\n }\n\n /**\n * Get current network status\n */\n private getNetworkStatus(): NetworkStatus {\n const online = typeof navigator !== 'undefined' ? navigator.onLine : true;\n const connection = this.getConnection();\n\n return {\n online,\n type: (connection?.type as ConnectionType) ?? 'unknown',\n effectiveType: connection?.effectiveType ?? '4g',\n downlink: connection?.downlink ?? 10,\n rtt: connection?.rtt ?? 50,\n saveData: connection?.saveData ?? false,\n timestamp: Date.now(),\n };\n }\n\n /**\n * Calculate network quality tier\n */\n private calculateQuality(status: NetworkStatus): NetworkQuality {\n if (!status.online) return 'offline';\n\n const { downlink, rtt, effectiveType } = status;\n\n // Effective type mapping\n if (effectiveType === 'slow-2g' || effectiveType === '2g') {\n return 'poor';\n }\n\n // Quality based on measured values\n if (downlink >= 5 && rtt <= 100) return 'excellent';\n if (downlink >= this.config.goodDownlinkThreshold && rtt <= this.config.goodRttThreshold) return 'good';\n if (effectiveType === '3g' || downlink >= 0.5) return 'fair';\n\n return 'poor';\n }\n\n /**\n * Setup event listeners\n */\n private setupListeners(): void {\n if (typeof window === 'undefined') return;\n\n // Online/offline events\n window.addEventListener('online', this.handleOnline);\n window.addEventListener('offline', this.handleOffline);\n\n // Network Information API events\n const connection = this.getConnection();\n if (connection) {\n connection.addEventListener('change', this.handleConnectionChange);\n }\n }\n\n /**\n * Handle online event\n */\n private handleOnline = (): void => {\n logger.info('[Network] Online');\n this.updateStatus();\n\n globalEventBus.emitSync('network:online', undefined);\n };\n\n /**\n * Handle offline event\n */\n private handleOffline = (): void => {\n logger.warn('[Network] Offline');\n this.updateStatus();\n\n globalEventBus.emitSync('network:offline', undefined);\n };\n\n /**\n * Handle connection change event\n */\n private handleConnectionChange = (): void => {\n this.updateStatus();\n };\n\n /**\n * Update status and notify callbacks\n */\n private updateStatus(): void {\n const newStatus = this.getNetworkStatus();\n const newQuality = this.calculateQuality(newStatus);\n\n const statusChanged =\n this.currentStatus.online !== newStatus.online ||\n this.currentStatus.effectiveType !== newStatus.effectiveType ||\n Math.abs(this.currentStatus.downlink - newStatus.downlink) > 0.5;\n\n const qualityChanged = this.currentQuality !== newQuality;\n\n this.currentStatus = newStatus;\n\n if (statusChanged) {\n this.statusCallbacks.forEach((cb) => cb(newStatus));\n }\n\n if (qualityChanged) {\n this.currentQuality = newQuality;\n this.qualityCallbacks.forEach((cb) => cb(newQuality));\n\n globalEventBus.emitSync('network:qualityChange', { quality: newQuality });\n logger.debug('[Network] Quality changed', { quality: newQuality });\n }\n }\n}\n\n// ============================================================================\n// Network-Aware Request Handler\n// ============================================================================\n\n/**\n * Network-aware fetch options\n */\nexport interface NetworkAwareFetchOptions extends RequestInit {\n /** Whether to queue request when offline */\n queueOffline?: boolean;\n /** Minimum quality required to send request */\n minQuality?: NetworkQuality;\n /** Timeout for waiting online */\n onlineTimeout?: number;\n /** Enable automatic retry on network recovery */\n retryOnRecovery?: boolean;\n}\n\n/**\n * Queued request\n */\ninterface QueuedRequest {\n url: string;\n options: NetworkAwareFetchOptions;\n resolve: (value: Response) => void;\n reject: (error: Error) => void;\n timestamp: number;\n}\n\n/**\n * Network-aware fetch wrapper\n */\nexport class NetworkAwareFetch {\n private monitor: NetworkMonitor;\n private offlineQueue: QueuedRequest[] = [];\n private unsubscribe: (() => void) | null = null;\n\n constructor(monitor: NetworkMonitor) {\n this.monitor = monitor;\n this.setupRecoveryHandler();\n }\n\n /**\n * Make network-aware fetch request\n */\n async fetch(url: string, options: NetworkAwareFetchOptions = {}): Promise {\n const {\n queueOffline = false,\n minQuality,\n onlineTimeout = 30000,\n retryOnRecovery = true,\n ...fetchOptions\n } = options;\n\n // Check network status\n if (!this.monitor.isOnline()) {\n if (queueOffline) {\n return this.queueRequest(url, options);\n }\n\n // Wait for online if timeout specified\n if (onlineTimeout > 0) {\n const online = await this.monitor.waitForOnline(onlineTimeout);\n if (!online) {\n throw new NetworkError('Network unavailable', 'offline');\n }\n } else {\n throw new NetworkError('Network unavailable', 'offline');\n }\n }\n\n // Check minimum quality\n if (minQuality) {\n const quality = this.monitor.getQuality();\n const qualityOrder: NetworkQuality[] = ['offline', 'poor', 'fair', 'good', 'excellent'];\n const currentIndex = qualityOrder.indexOf(quality);\n const minIndex = qualityOrder.indexOf(minQuality);\n\n if (currentIndex < minIndex) {\n throw new NetworkError(\n `Network quality insufficient: ${quality} < ${minQuality}`,\n 'quality'\n );\n }\n }\n\n try {\n return await fetch(url, fetchOptions);\n } catch (error) {\n // If request failed due to network and retry is 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[...this.offlineQueue];\n this.offlineQueue = [];\n\n logger.info('[Network] Processing offline queue', { count: queue.length });\n\n for (const request of queue) {\n // Skip requests older than 5 minutes\n if (Date.now() - request.timestamp > 300000) {\n request.reject(new Error('Request expired in offline queue'));\n continue;\n }\n\n try {\n const response = await fetch(request.url, request.options);\n request.resolve(response);\n } catch (error) {\n request.reject(error as Error);\n }\n }\n }\n\n /**\n * Queue request for later execution\n */\n private async queueRequest(url: string, options: NetworkAwareFetchOptions): Promise {\n return new Promise((resolve, reject) => {\n this.offlineQueue.push({\n url,\n options,\n resolve,\n reject,\n timestamp: Date.now(),\n });\n\n logger.debug('[Network] Request queued', { url, queueSize: this.offlineQueue.length });\n });\n }\n}\n\n// ============================================================================\n// Network Error\n// ============================================================================\n\n/**\n * Network-related error\n */\nexport class NetworkError extends Error {\n constructor(\n message: string,\n public readonly reason: 'offline' | 'timeout' | 'quality' | 'unknown'\n ) {\n super(message);\n this.name = 'NetworkError';\n }\n}\n\n// ============================================================================\n// Utility Functions\n// ============================================================================\n\n/**\n * Check if error is a network error\n */\nexport function isNetworkError(error: unknown): error is NetworkError {\n return error instanceof NetworkError;\n}\n\n/**\n * Check if error is due to offline status\n */\nexport function isOfflineError(error: unknown): boolean {\n if (error instanceof NetworkError) {\n return error.reason === 'offline';\n }\n if (error instanceof TypeError) {\n return error.message.includes('fetch') || error.message.includes('network');\n }\n return 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