import type * as fs from 'fs';
import type * as smartrx from '@push.rocks/smartrx';

/**
 * File system event types that the watcher emits
 */
export type TWatchEventType = 'add' | 'addDir' | 'change' | 'unlink' | 'unlinkDir' | 'ready' | 'error';

/**
 * Data structure for watch events
 */
export interface IWatchEvent {
  type: TWatchEventType;
  path: string;
  stats?: fs.Stats;
  error?: Error;
}

/**
 * Options for creating a watcher
 */
export interface IWatcherOptions {
  /** Base paths to watch (extracted from glob patterns) */
  basePaths: string[];
  /** Maximum directory depth to watch */
  depth: number;
  /** Whether to follow symbolic links */
  followSymlinks: boolean;
  /** Stability threshold for write detection (ms) */
  stabilityThreshold: number;
  /** Poll interval for write detection (ms) */
  pollInterval: number;
}

/**
 * Common interface for file watchers across runtimes
 */
export interface IWatcher {
  /** Start watching files */
  start(): Promise<void>;
  /** Stop watching and clean up */
  stop(): Promise<void>;
  /** Whether the watcher is currently active */
  readonly isWatching: boolean;
  /** Subject that emits watch events */
  readonly events$: smartrx.rxjs.Subject<IWatchEvent>;
}