/**
 * Investigation Map — user-facing workspace card.
 *
 * Shows the progress of reasoning as a set of investigation topics with
 * simple status indicators. Does NOT expose graph internals.
 *
 * Design principles:
 *   - Calm, spacious, accessible
 *   - No percentages, no progress bars, no confidence scores
 *   - Topics evolve naturally across turns
 */

import getInvestigationMapTopics from "@/lib/map/investigation-map-adapter";

/* ── Status icons (unicode — no icon library dependency) ─── */

const STATUS_ICONS = {
  established: "✓",
  current: "●",
  unknown: "○",
};

function topicRowColor(status) {
  switch (status) {
    case "established":
      return "text-gray-900";
    case "current":
      return "text-blue-800";
    default:
      return "text-gray-400";
  }
}

function topicIconColor(status) {
  switch (status) {
    case "established":
      return "text-green-600";
    case "current":
      return "text-blue-500";
    default:
      return "text-gray-300";
  }
}

/* ── Single topic row ───────────────────────────────────── */

function TopicRow({ title, status }) {
  const icon = STATUS_ICONS[status];
  const colorClass = topicRowColor(status);
  const iconColor = topicIconColor(status);
  const ariaLabel = `${status === "established" ? "Established" : status === "current" ? "Currently investigating" : "Still to explore"}: ${title}`;

  return (
    <div
      className={`flex items-center gap-3 py-2.5 text-sm transition-opacity duration-300 ease-in-out ${colorClass}`}
      aria-label={ariaLabel}
      role="listitem"
      data-testid={`map-topic-${status === "established" ? "established" : status === "current" ? "current" : "unknown"}`}
    >
      <span className={`flex-none text-base ${iconColor} leading-none`} aria-hidden="true">
        {icon}
      </span>
      <span className="flex-1">{title}</span>
    </div>
  );
}

/* ── Card wrapper ────────────────────────────────────────── */

export default function InvestigationMap({ turnCount = 0 }) {
  const topics = getInvestigationMapTopics(turnCount);

  // Group topics by status for cleaner rendering
  const groups = {
    established: topics.filter((t) => t.status === "established"),
    current: topics.filter((t) => t.status === "current"),
    unknown: topics.filter((t) => t.status === "unknown"),
  };

  // Only render the card if there are non-established topics (during active investigation)
  const hasActiveTopics = groups.current.length > 0 || groups.unknown.length > 0;
  if (!hasActiveTopics && groups.established.length === 0) return null;

  return (
    <div className="rounded-lg border border-gray-200 bg-white p-5" role="region" aria-label="Investigation map preview">
      <h2 className="mb-1 text-sm font-semibold uppercase tracking-wide text-gray-500">
        Investigation Map Preview
      </h2>
      <p className="mb-3 text-xs text-gray-400">
        This preview shows where a future reasoning map may appear. Its final shape will emerge from the reasoning engine.
      </p>

      <div className="space-y-px border-t border-gray-100 pt-3" role="list" aria-label="Investigation topics">
        {topics.map((topic, i) => (
          <TopicRow key={`${topic.title}-${i}`} title={topic.title} status={topic.status} />
        ))}
      </div>
    </div>
  );
}