const phaseTimes = Object.freeze({
  queued: 0,
  assigned: 800,
  filling: 2800,
  review: 5000,
});

export function createAgentState(search = "", reduced = false) {
  const params = new URLSearchParams(search);
  const capture = params.get("capture") === "1";
  const requested = params.get("phase");
  const phase = Object.hasOwn(phaseTimes, requested) ? requested : "review";
  return {
    elapsed: reduced ? 5000 : capture ? phaseTimes[phase] : 0,
    locked: capture || reduced,
  };
}

export function advanceAgent(state, milliseconds, active) {
  if (
    state.locked ||
    !active ||
    !Number.isFinite(milliseconds) ||
    milliseconds < 0
  )
    return { ...state };
  return { ...state, elapsed: Math.min(5000, state.elapsed + milliseconds) };
}

export function replayAgent(state) {
  return state.locked ? { ...state } : { ...state, elapsed: 0 };
}

export function describeAgent({ elapsed }) {
  const phase =
    elapsed >= 5000
      ? "review"
      : elapsed >= 1700
        ? "filling"
        : elapsed >= 800
          ? "assigned"
          : "queued";
  const groups =
    elapsed >= 3800 ? 3 : elapsed >= 2800 ? 2 : elapsed >= 1700 ? 1 : 0;
  return { phase, groups };
}

export function eligibleAgentVisibility(
  height,
  intersectionHeight,
  viewportHeight,
) {
  return (
    height > 0 && intersectionHeight >= Math.min(height, viewportHeight) / 2
  );
}