import { ClientOpts } from 'redis';

declare class BeeQueue {
  name: string;
  keyPrefix: string;
  jobs: any;
  paused: boolean;
  settings: any;

  constructor(name: string, settings?: BeeQueue.QueueSettings);

  on(ev: "ready",     fn: () => void): this;
  on(ev: "error",     fn: (err: Error) => void): this;
  on(ev: "succeeded", fn: (job: BeeQueue.Job, result: any) => void): this;
  on(ev: "retrying",  fn: (job: BeeQueue.Job, err: Error) => void): this;
  on(ev: "failed",    fn: (job: BeeQueue.Job, err: Error) => void): this;
  on(ev: "stalled",   fn: (jobId: string) => void): this;

  on(ev: "job succeeded", fn: (jobId: string, result: any) => void): this;
  on(ev: "job retrying",  fn: (jobId: string, err: Error) => void): this;
  on(ev: "job failed",    fn: (jobId: string, err: Error) => void): this;
  on(ev: "job progress",  fn: (jobId: string, progress: number) => void): this;

  createJob<T>(data: T): BeeQueue.Job;

  getJob(jobId: string, cb: (job: BeeQueue.Job) => void): void;
  getJob(jobId: string): Promise<BeeQueue.Job>;
  
  getJobs(type: string, page: BeeQueue.Page, cb: (jobs: BeeQueue.Job[]) => void): void;
  getJobs(type: string, page: BeeQueue.Page): Promise<BeeQueue.Job[]>;

  process<T>(handler: (job: BeeQueue.Job) => Promise<T>): void;
  process<T>(concurrency: number, handler: (job: BeeQueue.Job) => Promise<T>): void;
  process<T>(handler: (job: BeeQueue.Job, done: BeeQueue.DoneCallback<T>) => void): void;
  process<T>(concurrency: number, handler: (job: BeeQueue.Job, done: BeeQueue.DoneCallback<T>) => void): void;

  checkStalledJobs(interval?: number): Promise<number>;
  checkStalledJobs(interval: number, cb: (err: Error, numStalled: number) => void): void
  checkStalledJobs(cb: (err: Error, numStalled: number) => void): void

  checkHealth(): Promise<BeeQueue.HealthCheckResult>;
  checkHealth(cb: (counts: BeeQueue.HealthCheckResult) => void): void;

  close(): Promise<void>;
  close(cb: () => void): void;

  removeJob(jobId: string): Promise<void>;
  removeJob(jobId: string, cb: () => void): void

  destroy(): Promise<void>;
  destroy(cb: () => void): void;
}

declare namespace BeeQueue {
  interface QueueSettings {
    prefix?: string,
    stallInterval?: number,
    nearTermWindow?: number,
    delayedDebounce?: number,
    redis?: ClientOpts,
    isWorker?: boolean,
    getEvents?: boolean,
    sendEvents?: boolean,
    storeJobs?: boolean,
    ensureScripts?: boolean,
    activateDelayedJobs?: boolean,
    removeOnSuccess?: boolean,
    removeOnFailure?: boolean,
    quitCommandClient?: boolean;
    redisScanCount?: number
  }

  interface Job {
    id: string;
    data: any;
    readonly options: any;
    queue: BeeQueue;
    progress: number;

    on(ev: "succeeded", fn: (err: Error) => void): this;
    on(ev: "retrying",  fn: (err: Error) => void): this;
    on(ev: "failed",    fn: (err: Error) => void): this;
    on(ev: "progress",  fn: (progress: number) => void): this;

    setId(id: string): this;
    retries(n: number): this;
    backoff(strategy: "immediate" | "fixed" | "exponential", delayFactor: number): this;
    delayUntil(dateOrTimestamp: Date | number): this;
    timeout(milliseconds: number): this;
    save(): Promise<this>;
    save(cb: (job: this) => void): void;
    reportProgress(n: number): void;
    remove(): Promise<this>;
    remove(cb: (job: this) => void): void;
  }

  interface Page {
    start?: number;
    end?: number;
    size?: number;
  }

  interface HealthCheckResult {
    waiting:    number;
    active:     number;
    succeeded:  number;
    failed:     number;
    delayed:    number;
    newestJob?: string;
  }

  type DoneCallback<T> = (error: Error | null, result: T) => void;
}

export = BeeQueue;