/**
 * Compact statusline text for the goal harness footer chip.
 */

import type { GoalOrchestration } from "../types.ts";

/** Short display id for statusline (alphanumeric prefix, max 8). */
export function shortAgentId(id: string | undefined | null): string | undefined {
  if (!id?.trim()) return undefined;
  const cleaned = id.replace(/[^a-zA-Z0-9]/g, "");
  const short = (cleaned || id.trim()).slice(0, 8);
  return short || undefined;
}

/**
 * Format a statusline fragment for the active goal.
 * Returns `undefined` when there is no goal (clears the status key).
 */
export function formatStatusline(o: GoalOrchestration | null): string | undefined {
  if (!o) return undefined;

  const status = String(o.status ?? "");
  const phase = String(o.phase ?? "");
  const attempts = typeof o.verifyAttempts === "number" ? o.verifyAttempts : 0;
  const max = typeof o.verifyMax === "number" ? o.verifyMax : 0;

  if (status === "complete") return "✓ done";
  if (status === "blocked") return "⛔ blocked";

  if (
    status === "user_paused" ||
    status === "back_off_paused" ||
    status === "no_progress_paused" ||
    status === "infra_paused" ||
    status === "budget_limited"
  ) {
    return "⏸ pause";
  }

  if (phase === "planning" || status === "planning") {
    const short = shortAgentId(o.plannerAgentId);
    return short ? `◎ plan ${short}` : "◎ plan";
  }

  if (phase === "verifying") {
    if (max > 0) return `🔬 verify ${attempts}/${max}`;
    return "🔬 verify";
  }

  // active / executing
  if (attempts > 0 && max > 0) {
    return `● active ${attempts}/${max}`;
  }
  return "● active";
}