// src/integrations/meraki/switches.js
//
// Switch-level Meraki calls. Currently scoped to the network-wide
// multicast (IGMP snooping / flood-unknown-multicast) settings —
// added to support DECT troubleshooting where snooping-without-a-
// querier prunes multicast traffic and breaks handset registration.
//
// The Meraki endpoint is:
//   GET/PUT /networks/{networkId}/switch/routing/multicast
//
// Payload shape:
//   {
//     defaultSettings: {
//       igmpSnoopingEnabled: boolean,
//       floodUnknownMulticastTrafficEnabled: boolean,
//     },
//     overrides: [
//       { switches?: [serial, ...], stacks?: [stackId, ...], igmpSnoopingEnabled, floodUnknownMulticastTrafficEnabled },
//       ...
//     ],
//   }
//
// Target end-state for DECT stores (from the plan): network default
// snoop=false + flood=true, and NO overrides at all (network-level
// policy, every switch agrees by convention). That target is exported
// as a constant from commands/igmpFix.js and used verbatim by the fix
// path — this module intentionally stays policy-free.

import { merakiAxios } from './client.js';
import { logger } from '../../utils/logger.js';

/**
 * Fetch the current switch multicast settings for a network.
 * Returns the raw API response on success, or throws on network /
 * auth failure so the caller can decide how to degrade.
 */
export async function getSwitchMulticastSettings(networkId) {
  if (!networkId) {
    throw new Error('getSwitchMulticastSettings: networkId is required');
  }
  const res = await merakiAxios.get(`/networks/${networkId}/switch/routing/multicast`);
  return res.data;
}

/**
 * PUT the full multicast payload for a network. The Meraki endpoint
 * treats this as a full replacement — whatever `overrides` array you
 * send becomes the new authoritative list. That's why the fix path
 * sends `overrides: []` to wipe everything rather than trying to
 * patch individual entries.
 */
export async function setSwitchMulticastSettings(networkId, payload) {
  if (!networkId) {
    throw new Error('setSwitchMulticastSettings: networkId is required');
  }
  const res = await merakiAxios.put(
    `/networks/${networkId}/switch/routing/multicast`,
    payload,
  );
  logger('meraki:switches', `Updated multicast settings for network ${networkId}`, 'debug');
  return res.data;
}

/**
 * Pure summarizer — turns a raw multicast settings payload into a
 * "needs fix?" verdict for DECT-safe policy. Kept side-effect-free
 * so the unit test can call it with fixture data (no Meraki mock).
 *
 * "Needs fix" is true when:
 *   - Network default `igmpSnoopingEnabled !== false`, OR
 *   - Network default `floodUnknownMulticastTrafficEnabled !== true`, OR
 *   - Any override deviates on either setting.
 *
 * An override that happens to match the target defaults is redundant
 * (not deviating) — the multicast endpoint only stores these two
 * fields per override, so a matching override serves no purpose but
 * doesn't break anything either. We treat it as non-deviating so we
 * don't nag operators about harmless historical config.
 *
 * Malformed / missing input returns `needsFix: false` with both
 * boolean flags false — the caller stores `data.multicast.error` in
 * that case and the renderer stays silent, per the "diagnostic bot
 * shouldn't become a new source of noise" rule.
 *
 * @param {object} raw       Raw response from `getSwitchMulticastSettings`.
 * @returns {{
 *   defaultOk: boolean,
 *   defaultSnoopOn: boolean,
 *   defaultFloodOff: boolean,
 *   deviatingOverrides: object[],
 *   needsFix: boolean,
 *   raw: object,
 * }}
 */
export function summarizeMulticast(raw) {
  const def = raw?.defaultSettings || {};
  const defaultSnoopOn  = def.igmpSnoopingEnabled === true;
  const defaultFloodOff = def.floodUnknownMulticastTrafficEnabled === false;
  const defaultOk = !defaultSnoopOn && !defaultFloodOff;

  const overrides = Array.isArray(raw?.overrides) ? raw.overrides : [];
  const deviatingOverrides = overrides.filter((o) =>
    o?.igmpSnoopingEnabled !== false ||
    o?.floodUnknownMulticastTrafficEnabled !== true
  );

  return {
    defaultOk,
    defaultSnoopOn,
    defaultFloodOff,
    deviatingOverrides,
    needsFix: !defaultOk || deviatingOverrides.length > 0,
    raw,
  };
}