// services/phoneCollectorService.js
//
// Fan-out MPP phone probes over the DECT relay hub.

import { getDectRelayHub, RelayErrorCodes } from './dectRelayHub.js';
import { buildMppProbeView } from '../integrations/cisco-mpp-phone/aggregateProbe.js';
import { logger } from '../utils/logger.js';

const LOG_SCOPE = 'phone:collector';

const DEFAULT_TIMEOUT_MS = Number(process.env.PHONE_COLLECT_TIMEOUT_MS) || 15_000;

/**
 * @param {object[]} phones  from discoverDeskPhones()
 * @param {object} [opts]
 * @returns {Promise<object[]>}
 */
export async function probeAll(phones, opts = {}) {
  const list = Array.isArray(phones) ? phones : [];
  if (list.length === 0) return [];
  const hub = opts.hub || getDectRelayHub();
  const timeoutMs = opts.timeoutMs || DEFAULT_TIMEOUT_MS;

  logger(LOG_SCOPE, `Fanning out phone-probe() to ${list.length} phone(s)`, 'debug');

  const results = await Promise.all(list.map((phone) => probeOne(hub, phone, timeoutMs)));

  const okCount = results.filter((r) => r.ok).length;
  logger(LOG_SCOPE, `Phone probe finished: ${okCount}/${list.length} succeeded`, 'debug');
  return results;
}

/**
 * @param {object[]} phones
 * @param {object} [opts]
 * @returns {Promise<object[]>}
 */
export async function probeRawAll(phones, opts = {}) {
  const list = Array.isArray(phones) ? phones : [];
  if (list.length === 0) return [];
  const hub = opts.hub || getDectRelayHub();
  const timeoutMs = opts.timeoutMs || DEFAULT_TIMEOUT_MS;

  logger(LOG_SCOPE, `Fanning out phone-probe-raw() to ${list.length} phone(s)`, 'debug');

  const results = await Promise.all(list.map((phone) => probeRawOne(hub, phone, timeoutMs)));

  const okCount = results.filter((r) => r.ok).length;
  logger(LOG_SCOPE, `Phone probe-raw finished: ${okCount}/${list.length} succeeded`, 'debug');
  return results;
}

export async function probeOne(hub, phone, timeoutMs = DEFAULT_TIMEOUT_MS) {
  if (!phone?.ip) {
    return {
      phone, ok: false, probes: null, statusJson: null, statusXml: null, parsed: null, verdict: null,
      elapsedMs: null,
      error: { code: 'NO_IP', message: 'phone has no IP address' },
    };
  }
  const started = Date.now();
  try {
    const { result, elapsedMs } = await hub.phoneProbe(phone.ip, { timeoutMs });
    const mpp = buildMppProbeView({
      statusJson: result?.statusJson,
      statusXml: result?.statusXml,
      downloadStatusJson: result?.downloadStatusJson,
      nsJson: result?.nsJson,
      systemJson: result?.systemJson,
      probes: result?.probes,
    });
    const summary = result?.summary || null;
    return {
      phone,
      ok: !!(summary?.statusJsonFound || summary?.statusXmlFound || mpp.parsed),
      probes: result?.probes || null,
      statusJson: result?.statusJson || null,
      statusXml: result?.statusXml || null,
      downloadStatusJson: result?.downloadStatusJson || null,
      nsJson: result?.nsJson || null,
      systemJson: result?.systemJson || null,
      cfgParsed: result?.cfgParsed || null,
      parsed: mpp.parsed,
      verdict: mpp.verdict,
      mpp,
      summary,
      elapsedMs: elapsedMs ?? (Date.now() - started),
      error: null,
    };
  } catch (err) {
    return {
      phone,
      ok: false,
      probes: null,
      statusJson: null,
      statusXml: null,
      parsed: null,
      verdict: null,
      elapsedMs: Date.now() - started,
      error: {
        code: err?.code || 'UNKNOWN',
        message: err?.message || String(err),
        hint: hintFor(err?.code),
      },
    };
  }
}

export async function probeRawOne(hub, phone, timeoutMs = DEFAULT_TIMEOUT_MS) {
  if (!phone?.ip) {
    return {
      phone, ok: false, probes: null, statusJson: null, statusXml: null, parsed: null, verdict: null,
      byteLength: null, elapsedMs: null,
      error: { code: 'NO_IP', message: 'phone has no IP address' },
    };
  }
  const started = Date.now();
  try {
    const { result, elapsedMs } = await hub.phoneProbeRaw(phone.ip, { timeoutMs });
    const mpp = buildMppProbeView({
      statusJson: result?.statusJson,
      statusXml: result?.statusXml,
      downloadStatusJson: result?.downloadStatusJson,
      nsJson: result?.nsJson,
      systemJson: result?.systemJson,
      probes: result?.probes,
    });
    const summary = result?.summary || null;
    return {
      phone,
      ok: !!(summary?.statusJsonFound || summary?.statusXmlFound || result?.statusJson || result?.statusXml),
      probes: result?.probes || null,
      statusJson: result?.statusJson || null,
      statusXml: result?.statusXml || null,
      downloadStatusJson: result?.downloadStatusJson || null,
      nsJson: result?.nsJson || null,
      systemJson: result?.systemJson || null,
      byteLength: result?.byteLength ?? null,
      cfgParsed: result?.cfgParsed || null,
      parsed: mpp.parsed,
      verdict: mpp.verdict,
      mpp,
      summary,
      elapsedMs: elapsedMs ?? (Date.now() - started),
      error: null,
    };
  } catch (err) {
    return {
      phone,
      ok: false,
      probes: null,
      statusJson: null,
      statusXml: null,
      parsed: null,
      verdict: null,
      byteLength: null,
      elapsedMs: Date.now() - started,
      error: {
        code: err?.code || 'UNKNOWN',
        message: err?.message || String(err),
        hint: hintFor(err?.code),
      },
    };
  }
}

function hintFor(code) {
  switch (code) {
    case RelayErrorCodes.NOT_CONNECTED:
      return 'DECT relay agent is not connected. Check that dect-relay-agent is running in the data center.';
    case RelayErrorCodes.TIMEOUT:
      return 'Relay accepted the request but the phone did not respond in time.';
    case RelayErrorCodes.DISCONNECTED:
      return 'Relay agent disconnected while this command was in flight. Try again.';
    case 'AGENT_CONFIG':
      return 'Relay agent configuration is incomplete — check dect-relay-agent/.env and restart.';
    default:
      return null;
  }
}