// services/voiceReport/joinCallQuality.js
// Join CDR legs, Media Quality rows, and Prisma WAN buckets.

import { isWithinWindow } from './businessWindow.js';
import {
  cdrCalledNumber,
  cdrCallingNumber,
  cdrDirectionValue,
  cdrDispositionValue,
  cdrDurationSeconds,
  cdrField,
  cdrStartTime,
} from '../cdrFeedParser.js';
import { groupCdrIntoCalls, summarizeCalls } from './groupCdrCalls.js';

export function phoneDigits(value) {
  const d = String(value || '').replace(/\D/g, '');
  if (d.length === 10) return `1${d}`;
  if (d.length === 11 && d.startsWith('1')) return d;
  return d;
}

function cdrDisposition(item) {
  return cdrDispositionValue(item);
}

function cdrDirection(item) {
  return cdrDirectionValue(item);
}

function cdrStart(item) {
  return cdrStartTime(item);
}

function cdrDuration(item) {
  return cdrDurationSeconds(item);
}

function normalizeCdrLeg(item) {
  return {
    start: cdrStart(item),
    direction: cdrDirection(item),
    duration: cdrDuration(item),
    disposition: cdrDisposition(item),
    callingNumber: cdrCallingNumber(item),
    calledNumber: cdrCalledNumber(item),
    correlationId: cdrField(item, 'correlationId', 'Correlation ID', 'correlationID'),
    raw: item,
  };
}

function mqCorrelation(row) {
  const n = row._norm || {};
  return n.correlationid || n.finalcorrelationid || row['Correlation ID'] || null;
}

function mqStart(row) {
  const n = row._norm || {};
  return n.starttime || n.callstarttime || row['Start Time'] || null;
}

function mqNumbers(row) {
  const n = row._norm || {};
  return [
    n.callingnumber, n.callednumber, n.remoteparty,
    row['Calling Number'], row['Called Number'],
  ].filter(Boolean).map(phoneDigits);
}

function mqQuality(row) {
  const n = row._norm || {};
  const mos = Number(n.mos || n.meanopinionscore || n.audiomos || NaN);
  const jitter = Number(n.jitter || n.jitterms || NaN);
  const loss = Number(n.packetloss || n.packetlosspct || n.loss || NaN);
  return {
    mos: Number.isFinite(mos) ? mos : null,
    jitter: Number.isFinite(jitter) ? jitter : null,
    loss: Number.isFinite(loss) ? loss : null,
  };
}

function scoreMqMatch(call, row) {
  const callCorr = call.correlationId ? String(call.correlationId).toLowerCase() : '';
  const rowCorr = mqCorrelation(row);
  if (callCorr && rowCorr && String(rowCorr).toLowerCase() === callCorr) return 100;

  const legStart = call.start ? new Date(call.start).getTime() : NaN;
  const rowStart = mqStart(row) ? new Date(mqStart(row)).getTime() : NaN;
  if (!Number.isFinite(legStart) || !Number.isFinite(rowStart)) return 0;

  const delta = Math.abs(legStart - rowStart);
  if (delta > 120_000) return 0;

  let score = 50;
  if (delta < 15_000) score += 30;
  else if (delta < 60_000) score += 10;

  const legNums = new Set([
    phoneDigits(call.callingNumber),
    phoneDigits(call.calledNumber),
  ].filter(Boolean));
  const rowNums = mqNumbers(row);
  if (rowNums.some((n) => legNums.has(n))) score += 20;
  return score;
}

export function matchMediaQualityToCall(call, mqRows) {
  let best = null;
  let bestScore = 0;
  for (const row of mqRows || []) {
    const s = scoreMqMatch(call, row);
    if (s > bestScore) {
      bestScore = s;
      best = row;
    }
  }
  if (!best || bestScore < 50) return null;
  return { ...mqQuality(best), score: bestScore };
}

/** @deprecated use matchMediaQualityToCall */
export function matchMediaQualityToLeg(leg, mqRows) {
  return matchMediaQualityToCall(leg, mqRows);
}

/**
 * Find worst Prisma 5-min bucket overlapping [start, end].
 */
export function worstPrismaBucketForCall(call, appAudio, window) {
  if (!appAudio?.mos?.values?.length) return null;
  const startMs = call.start ? new Date(call.start).getTime() : NaN;
  const endMs = Number.isFinite(startMs)
    ? startMs + (call.duration || 0) * 1000
    : NaN;
  if (!Number.isFinite(startMs)) return null;

  const intervalMs = 5 * 60 * 1000;
  const winStart = new Date(window.startTime).getTime();
  const idx0 = Math.max(0, Math.floor((startMs - winStart) / intervalMs));
  const idx1 = Math.max(idx0, Math.ceil((endMs - winStart) / intervalMs));

  const mosVals = appAudio.mos.values;
  const lossVals = appAudio.loss?.values || [];
  const jitterVals = appAudio.jitter?.values || [];

  let worstMos = null;
  let worstLoss = null;
  let worstJitter = null;
  for (let i = idx0; i <= idx1 && i < mosVals.length; i++) {
    const m = mosVals[i];
    if (typeof m === 'number' && (worstMos == null || m < worstMos)) worstMos = m;
    const l = lossVals[i];
    if (typeof l === 'number' && (worstLoss == null || l > worstLoss)) worstLoss = l;
    const j = jitterVals[i];
    if (typeof j === 'number' && (worstJitter == null || j > worstJitter)) worstJitter = j;
  }

  if (worstMos == null && worstLoss == null && worstJitter == null) return null;
  return {
    siteLevelApprox: true,
    mos: worstMos,
    loss: worstLoss,
    jitter: worstJitter,
  };
}

export function summarizeDispositions(legs) {
  const counts = {};
  for (const leg of legs) {
    const key = String(leg.disposition || 'unknown').toLowerCase();
    counts[key] = (counts[key] || 0) + 1;
  }
  return counts;
}

export function joinCallQuality({ cdrItems, mqRows, appAudio, window }) {
  const calls = groupCdrIntoCalls(cdrItems);
  const joined = calls.map((call) => {
    const media = matchMediaQualityToCall(call, mqRows);
    const wan = worstPrismaBucketForCall(call, appAudio, window);
    return { ...call, media, wan };
  });

  return {
    calls: joined,
    legs: joined, // backward compat for callers expecting .legs
    summary: summarizeCalls(joined),
  };
}

export function filterCdrToWindow(items, window) {
  return (items || []).filter((item) => {
    const start = cdrStartTime(item);
    // cdr_feed query params already scope by start time; keep rows when the
    // report column label differs from our camelCase guesses.
    if (!start) return true;
    return isWithinWindow(start, window);
  });
}