// Clock abstraction so AutoManager can be tested deterministically.
// Production code uses RealClock; tests inject a MockClock that exposes
// advanceTime() to drive timers manually.

export interface CancellableTimer {
  cancel(): void;
}

export interface Clock {
  now(): Date;
  setTimeout(fn: () => void, ms: number): CancellableTimer;
  setInterval(fn: () => void, ms: number): CancellableTimer;
}

export class RealClock implements Clock {
  public now(): Date {
    return new Date();
  }

  public setTimeout(fn: () => void, ms: number): CancellableTimer {
    const handle = setTimeout(fn, ms);
    return { cancel: () => clearTimeout(handle) };
  }

  public setInterval(fn: () => void, ms: number): CancellableTimer {
    const handle = setInterval(fn, ms);
    return { cancel: () => clearInterval(handle) };
  }
}