// services/dectStatus/buildHandsetContext.js
//
// Group Webex DECT handset inventory for /dectstatus rendering.

/**
 * @param {object|null} phoneData   collectPhoneStatus() output
 * @returns {object}
 */
export function buildHandsetContext(phoneData) {
  const basestations = Array.isArray(phoneData?.dectBasestations)
    ? phoneData.dectBasestations
    : [];
  const handsets = Array.isArray(phoneData?.dectHandsets)
    ? phoneData.dectHandsets
    : [];

  const handsetsByWebexId = new Map();
  const linesRegisteredByWebexId = new Map();
  const webexIdByMac = new Map();

  for (const base of basestations) {
    if (base.id) {
      handsetsByWebexId.set(base.id, []);
      linesRegisteredByWebexId.set(base.id, base.linesRegistered ?? null);
    }
    const mac = normalizeMacLoose(base.mac);
    if (base.id && mac) webexIdByMac.set(mac, base.id);
  }

  const unassignedHandsets = [];

  for (const h of handsets) {
    const baseId = h.baseStationId || null;
    if (baseId && handsetsByWebexId.has(baseId)) {
      handsetsByWebexId.get(baseId).push(h);
    } else if (!baseId) {
      unassignedHandsets.push(h);
    } else {
      // Assigned to a base id we don't know — treat as unassigned for display.
      unassignedHandsets.push(h);
    }
  }

  return {
    handsetsByWebexId,
    linesRegisteredByWebexId,
    webexIdByMac,
    unassignedHandsets,
    dectNetwork: phoneData?.dectNetwork || null,
  };
}

/**
 * Handsets registered to a base (by Webex base id).
 *
 * @param {object} handsetCtx   buildHandsetContext() output
 * @param {string|null} webexId
 * @returns {object[]}
 */
export function handsetsForBase(handsetCtx, webexId) {
  if (!webexId || !handsetCtx?.handsetsByWebexId) return [];
  return handsetCtx.handsetsByWebexId.get(webexId) || [];
}

function normalizeMacLoose(mac) {
  if (!mac || typeof mac !== 'string') return null;
  const hex = mac.replace(/[^0-9a-fA-F]/g, '').toLowerCase();
  if (hex.length !== 12) return null;
  return hex.match(/../g).join(':');
}