/**
 * Status line for the loading view's running sub-state.
 *
 * The backend does not stream agent progress, so the line is chosen from elapsed run time
 * only and never claims a specific activity. It starts neutral and gets more playful the
 * longer the run goes, in the same register as the Exit queue button (js/queue.js), so a
 * multi-minute wait reads as patience rather than a hang.
 */

/** How often the running view re-evaluates the status line. */
export const RUNNING_STATUS_TICK_MS = 5000;

/**
 * Stages ordered by the elapsed time (ms) at which each line takes over.
 * @type {ReadonlyArray<{ fromMs: number, text: string }>}
 */
export const RUNNING_STATUS_STAGES = Object.freeze([
  { fromMs: 0, text: 'Searching Confluence…' },
  { fromMs: 20_000, text: 'Rummaging through the wiki…' },
  { fromMs: 60_000, text: "Reading everything so you don't have to…" },
  { fromMs: 120_000, text: 'Turning pages faster than a human could…' },
  { fromMs: 240_000, text: 'Lost in Confluence, found three more tabs…' },
  { fromMs: 420_000, text: 'Has anyone updated this page since 2019? Checking…' },
  { fromMs: 660_000, text: 'Still at it. If time runs out, it answers with what it found…' },
]);

/**
 * Picks the running status line for the time elapsed since the query was sent.
 * Non-finite or negative input reads as "just started".
 * @param {number} elapsedMs
 * @returns {string}
 */
export function formatRunningStatus(elapsedMs) {
  const elapsed = Number.isFinite(elapsedMs) && elapsedMs > 0 ? elapsedMs : 0;
  let text = RUNNING_STATUS_STAGES[0].text;
  for (const stage of RUNNING_STATUS_STAGES) {
    if (elapsed >= stage.fromMs) text = stage.text;
  }
  return text;
}