import { EventEmitter } from 'node:events';

interface DashboardMemoryMetrics {
  rss?: number
  heapUsed?: number
  heapTotal?: number
  [key: string]: unknown
}

interface DashboardMetrics {
  generatedAt: string
  buildMs: number | null
  scanMs: number | null
  analyzeMs: number | null
  compileMs: number | null
  memoryMb: DashboardMemoryMetrics | null
  classCount: number | null
  fileCount: number | null
  cssBytes: number | null
  packageCount: number | null
  mode: "idle" | "jit" | "build" | "watch" | "error" | null
  error?: string
  lastEventType?: string
  eventsReceived?: number
  eventsProcessed?: number
  batchesProcessed?: number
  incrementalUpdates?: number
  fullRescans?: number
  skippedLargeFiles?: number
  queueMaxSize?: number
  lastBuildMs?: number
  avgBuildMs?: number
  [key: string]: unknown
}

interface DashboardHealthIssue {
  severity: "error" | "warning"
  message: string
}

interface DashboardMetricsSummary {
  workspace: {
    totalPackages: number
    totalFiles: number
    totalClasses: number
    lastScanDurationMs: number
    lastBuildDurationMs: number
  }
  cache: {
    hitRate: number
    totalEntries: number
    memoryUsageMb: number
  }
  pipeline: {
    scanDurationMs: number
    analyzeDurationMs: number
    compileDurationMs: number
    totalDurationMs: number
  }
  health: {
    status: "healthy" | "degraded" | "unhealthy"
    issues: DashboardHealthIssue[]
  }
}

declare const currentMetrics: DashboardMetrics
declare const history: DashboardMetrics[]
declare const events: EventEmitter
declare function normalizeMetrics(data: Record<string, unknown>): DashboardMetrics
declare function updateMetrics(data: Record<string, unknown>): DashboardMetrics
declare function resetHistory(): void
declare function getMetricsSummary(): DashboardMetricsSummary

export { currentMetrics, events, getMetricsSummary, history, normalizeMetrics, resetHistory, updateMetrics };