/**
 * Investigation Map Mock Adapter
 *
 * Provides the Investigation Map with a set of investigation topics and their
 * current status (established / current / unknown).
 *
 * TODO: Replace this mock adapter when the reasoning engine emits real
 * investigation data. The eventual contract should provide:
 *   - `investigationTopics`: [{ title, status, evidenceCount? }]
 *   - `topicStatus` values: "established" | "current" | "unknown"
 *   - `topicOrdering`: the reasoning-engine-determined sequence
 *   - `evidenceCount`: optional count of supporting evidence per topic
 *
 * Until then, this adapter drives a realistic mock progression across turns.
 */

/** @type {Array<{ title: string }>} */
const TOPICS = [
  { title: "Central situation" },
  { title: "Complaint trend direction" },
  { title: "Measurement basis" },
  { title: "Production volume context" },
  { title: "QA process changes" },
  { title: "Product change log" },
  { title: "Support response patterns" },
  { title: "Prior similar cases" },
];

/**
 * Status progression per turn index.
 * The reasoning engine will eventually determine these values.
 */
const PROGRESSION = [
  // Turn 0 — initial analysis just started
  ["established", "unknown", "unknown", "unknown", "unknown", "unknown", "unknown", "unknown"],
  // Turn 1 — first question answered
  ["established", "established", "current", "unknown", "unknown", "unknown", "unknown", "unknown"],
  // Turn 2 — second question answered
  ["established", "established", "established", "current", "unknown", "unknown", "unknown", "unknown"],
  // Turn 3 — third question answered
  ["established", "established", "established", "established", "current", "unknown", "unknown", "unknown"],
  // Turn 4 — fourth question answered
  ["established", "established", "established", "established", "established", "current", "unknown", "unknown"],
  // Turn 5 — fifth question answered
  ["established", "established", "established", "established", "established", "established", "current", "unknown"],
  // Turn 6+ — final turn
  ["established", "established", "established", "established", "established", "established", "established", "current"],
];

/**
 * Get investigation map topics for a given turn index.
 * @param {number} turnIndex - Zero-based turn number (0 = initial analysis).
 * @returns {{ title: string, status: 'established' | 'current' | 'unknown' }[]}
 */
export function getInvestigationMapTopics(turnIndex) {
  const idx = Math.min(turnIndex, PROGRESSION.length - 1);
  return TOPICS.map((topic, i) => ({
    title: topic.title,
    status: PROGRESSION[idx][i],
  }));
}

export default getInvestigationMapTopics;