import { EventEmitter } from 'events';
// app
import { ISegment } from '../playlist-builder';

export type CacheSegmentFilter = (segment: ISegment) => boolean;

export interface ICacheManagerCheckSegmentInput {
  orgId: string;
  fileId: string;
  segmentId: string;
}

export interface ICacheManager extends EventEmitter {
  getStorage(orgId: string): Promise<number|never>;
  getMaxStorage(orgId: string): Promise<number|never>;
  setMaxStorage(orgId: string, maxStorage: number): Promise<void|never>;
  wasBilled(orgId: string, fileId: string, segmentId: string): Promise<boolean|never>;
  saveCache(orgId: string, segmentId: string, segment: ISegment): Promise<void|never>;
  checkCache(orgId: string, fileId: string, segmentId: string): Promise<ISegment|null|never>;
  checkCacheBatch(segments: ICacheManagerCheckSegmentInput[]): Promise<ISegment[]|null|never>;
  removeCache(orgId: string, fileId: string, segmentId: string): Promise<void|never>;
  clearCache(orgId?: string, files?: string[], chunkSize?: number, deletionParallelism?: number, filter?: CacheSegmentFilter, dryRun?: boolean): Promise<void|never>;
  cleanupCache(): Promise<void|never>;
  startCacheGC(): void;
  stopCacheGC(): void;
}