/**
 * Tracks whether a streaming response has stalled (no new tokens for a while)
 * and produces a smooth 0→1 intensity value suitable for color interpolation
 * (e.g. fading the spinner glyph toward red).
 *
 * Driven by an external clock signal rather than its own interval, so it
 * automatically slows down when the terminal is backgrounded (no ticks = no
 * updates) and doesn't create a second timer alongside the animation clock.
 *
 * ```ts
 * const time = useClock(50);
 * const stalled = useStalled(time, () => responseLength());
 * // stalled.isStalled()  — boolean
 * // stalled.intensity()  — 0..1
 * ```
 */

export function useStalled(time, getLength, opts) {
  const delay = opts?.delayMs ?? 3000;
  const ramp = opts?.rampMs ?? 2000;
  let lastLength = getLength();
  let lastChangeTime = 0;
  let smoothIntensity = 0;
  let lastSmoothTime = 0;
  const isStalled = () => {
    const t = time(); // subscribe to clock
    const len = getLength();
    if (len > lastLength) {
      lastLength = len;
      lastChangeTime = t;
    }
    return t - lastChangeTime > delay;
  };
  const intensity = () => {
    const t = time(); // subscribe to clock
    const len = getLength();
    if (len > lastLength) {
      lastLength = len;
      lastChangeTime = t;
      smoothIntensity = 0;
      lastSmoothTime = t;
      return 0;
    }
    const idle = t - lastChangeTime;
    const target = idle > delay ? Math.min((idle - delay) / ramp, 1) : 0;

    // Smooth approach — step at ~50ms granularity
    const dt = t - lastSmoothTime;
    if (dt >= 50 && (target > 0 || smoothIntensity > 0)) {
      const diff = target - smoothIntensity;
      if (Math.abs(diff) < 0.01) {
        smoothIntensity = target;
      } else {
        smoothIntensity += diff * 0.1;
      }
      lastSmoothTime = t;
    }
    return smoothIntensity;
  };
  return {
    isStalled,
    intensity
  };
}
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