/** Read-only evidence projection. Removed/refreshed auras end the observed window. */
function summarizeActorDisarmEvidence(events, auraSamples, playerId, partyIds = []) {
  const actorIds = new Set([playerId, ...partyIds]);
  const windows = [], open = new Map();
  const keyFor = (aura) => JSON.stringify([aura.instanceId, aura.sourceId, aura.targetId, aura.appliedAt]);
  const samples = [...auraSamples].sort((a, b) => a.observedAt - b.observedAt);
  for (const sample of samples) {
    const auras = (sample.auras ?? []).filter((aura) => aura.definitionId === 'enemy-source-spell-6713'
      && actorIds.has(aura.targetId) && Number.isFinite(aura.appliedAt));
    const keys = new Set(auras.map(keyFor));
    for (const [key, window] of open) {
      if (keys.has(key)) continue;
      const replacement = auras.find((aura) => aura.instanceId === window.instanceId && aura.targetId === window.targetId);
      const removalAt = Number.isFinite(replacement?.appliedAt) ? replacement.appliedAt : sample.observedAt;
      window.observedEndAt = Math.min(window.expiresAt ?? Number.POSITIVE_INFINITY, removalAt);
      window.endEvidence = replacement ? 'refresh' : 'committed-removal';
      open.delete(key);
    }
    for (const aura of auras) {
      const key = keyFor(aura);
      if (open.has(key)) continue;
      const window = { ...aura, observedEndAt: aura.expiresAt ?? null, endEvidence: 'source-expiry' };
      windows.push(window);
      open.set(key, window);
    }
  }
  const actorHandEvents = events.filter((event) => event.kind === 'damage'
    && actorIds.has(event.sourceActorId) && event.attackHand != null);
  const disarmWindows = windows.map((window) => ({ ...window,
    handEvents: actorHandEvents.filter((event) => event.sourceActorId === window.targetId
      && event.occurredAt >= window.appliedAt
      && window.observedEndAt !== null && event.occurredAt < window.observedEndAt),
  }));
  return { actorHandEvents, disarmWindows,
    coverage: 'Hand-tagged player/party damage results matched to committed source Disarm windows; removal/refresh ends a window. No event proves an unsampled cast gate, damage formula, or missing hand.' };
}

module.exports = { summarizeActorDisarmEvidence };