/** Mirrors backend terminationJointReviewRound.util.ts — keep send-back / reconsider detection aligned. */

const norm = (s: string | undefined | null) =>
  String(s || '')
    .toLowerCase()
    .replace(/\s+/g, ' ')
    .trim();

const SCN_CANONICAL = 'Evaluation of Dealer SCN Response';

export const isScnResponseJointTargetStage = (targetStage: string | undefined | null): boolean => {
  const n = norm(targetStage);
  if (!n) return false;
  if (n === norm(SCN_CANONICAL)) return true;
  if (n.includes('evaluation') && n.includes('scn') && n.includes('response')) return true;
  if (n.includes('personal hearing')) return true;
  return false;
};

export const isRbmJointTargetStage = (targetStage: string | undefined | null): boolean => {
  const n = norm(targetStage);
  return n.includes('rbm') && (n.includes('dd-zm') || n.includes('dd zm'));
};

function isSendBackOrReconsiderTimelineAction(action: string | undefined | null): boolean {
  const a = norm(action);
  return (
    a.includes('sent back') ||
    a.includes('send back') ||
    a.includes('reconsider') ||
    a.includes('reconsideration')
  );
}

export type JointRoundTimelineMode = 'scn_response_eval' | 'rbm_review';

export function getJointRoundCutoffMsFromTimeline(
  timeline: unknown,
  mode: JointRoundTimelineMode
): number | null {
  if (!Array.isArray(timeline) || timeline.length === 0) return null;
  const matcher = mode === 'scn_response_eval' ? isScnResponseJointTargetStage : isRbmJointTargetStage;
  const arr = timeline as Record<string, unknown>[];
  for (let i = arr.length - 1; i >= 0; i--) {
    const e = arr[i];
    if (!isSendBackOrReconsiderTimelineAction(e?.action as string)) continue;
    if (!matcher(e?.targetStage as string)) continue;
    const t = e?.timestamp != null ? new Date(e.timestamp as string | number | Date).getTime() : NaN;
    if (!Number.isNaN(t)) return t;
  }
  return null;
}

export function auditLogTimestampMs(log: { createdAt?: string | Date; timestamp?: string | Date }): number {
  const raw = log.createdAt ?? log.timestamp;
  if (raw == null) return 0;
  const t = new Date(raw).getTime();
  return Number.isNaN(t) ? 0 : t;
}

export function isAuditLogInCurrentJointRound(log: { createdAt?: string | Date; timestamp?: string | Date }, cutoffMs: number | null): boolean {
  if (cutoffMs == null) return true;
  return auditLogTimestampMs(log) >= cutoffMs;
}