// services/callReport/groupCdrCalls.js
// Group cdr_feed legs by Correlation ID into logical calls.

import {
  cdrCalledNumber,
  cdrCallerIdNumber,
  cdrCallingLineId,
  cdrCallingNumber,
  cdrDialedDigits,
  cdrDirectionValue,
  cdrDurationSeconds,
  cdrField,
  cdrModel,
  cdrRecordId,
  cdrSiteMainNumber,
  cdrStartTime,
  cdrDedupKey,
  cdrUserName,
  cdrUserNumber,
  formatCallDisposition,
} from '../cdrFeedParser.js';

export const CALL_BUCKETS = {
  inboundReachedPhone: 'inboundReachedPhone',
  inboundAaOnly: 'inboundAaOnly',
  outboundConnected: 'outboundConnected',
  other: 'other',
};

export function cdrCorrelationId(item) {
  return cdrField(item, 'correlationId', 'Correlation ID', 'correlationID');
}

function isTruthyAnswered(item) {
  const answered = String(cdrField(item, 'Answered', 'answered') || '').toLowerCase();
  const indicator = String(cdrField(item, 'Answer indicator', 'answer indicator') || '');
  return answered === 'true' || indicator === 'Yes';
}

function isUserPhoneLeg(item) {
  const userType = String(cdrField(item, 'User type', 'userType') || '');
  const clientType = String(cdrField(item, 'Client type', 'clientType') || '').toUpperCase();
  const model = String(cdrField(item, 'Model', 'model') || '');
  if (userType === 'User') return true;
  if (clientType === 'WXC_DEVICE') return true;
  if (model.toUpperCase().includes('DBS')) return true;
  return false;
}

function isAutomatedAttendantLeg(item) {
  const userType = String(cdrField(item, 'User type', 'userType') || '').toLowerCase();
  return userType.includes('automatedattendant');
}

function callTypeValue(item) {
  return String(cdrField(item, 'Call type', 'callType') || '').toUpperCase();
}

export function classifyCallDirection(legs) {
  for (const leg of legs) {
    const ct = callTypeValue(leg);
    if (ct.includes('INBOUND')) return 'inbound';
    if (ct.includes('OUTBOUND')) return 'outbound';
  }
  for (const leg of legs) {
    const dir = cdrDirectionValue(leg);
    const inboundTrunk = cdrField(leg, 'Inbound trunk', 'inbound trunk');
    const outboundTrunk = cdrField(leg, 'Outbound trunk', 'outbound trunk');
    if (inboundTrunk && dir.includes('TERMINAT')) return 'inbound';
    if (outboundTrunk && dir.includes('ORIGINAT')) return 'outbound';
  }
  for (const leg of legs) {
    const dir = cdrDirectionValue(leg);
    if (dir.includes('ORIGINAT')) return 'outbound';
    if (dir.includes('TERMINAT')) return 'inbound';
  }
  return 'unknown';
}

export function isNormalCallOutcome(item) {
  const outcome = String(cdrField(item, 'Call outcome', 'call outcome') || '').toLowerCase();
  const reason = String(cdrField(item, 'Call outcome reason', 'call outcome reason') || '').toLowerCase();
  if (!outcome) return true;
  if (outcome !== 'success') return false;
  return !reason || reason === 'normal';
}

function findInboundEntryLeg(legs) {
  return legs.find((l) => callTypeValue(l).includes('INBOUND')) || legs[0];
}

function findUserPhoneLeg(legs) {
  return legs.find((l) => isUserPhoneLeg(l) && isTruthyAnswered(l))
    || legs.find(isUserPhoneLeg);
}

function findOutboundOriginatingLeg(legs) {
  return legs.find((l) => cdrDirectionValue(l).includes('ORIGINAT') && isUserPhoneLeg(l))
    || legs.find((l) => cdrDirectionValue(l).includes('ORIGINAT'));
}

function digitsOnly(value) {
  return String(value || '').replace(/\D/g, '');
}

function pickFinalNumber(legs, mainNumber, phoneLeg) {
  const candidates = [
    phoneLeg ? cdrCalledNumber(phoneLeg) : null,
    phoneLeg ? cdrUserNumber(phoneLeg) : null,
    phoneLeg ? cdrDialedDigits(phoneLeg) : null,
    ...legs.map(cdrDialedDigits),
    ...legs.filter(isUserPhoneLeg).map(cdrCalledNumber),
  ].filter(Boolean);

  const mainDigits = digitsOnly(mainNumber);
  for (const c of candidates) {
    const d = digitsOnly(c);
    if (!d) continue;
    if (mainDigits && d === mainDigits) continue;
    if (c !== mainNumber) return c;
  }
  return null;
}

function pickCallingLineId(legs, direction) {
  if (direction === 'inbound') {
    const entry = findInboundEntryLeg(legs);
    const clid = cdrCallingLineId(entry);
    if (clid && String(clid).toUpperCase() !== 'NA') return clid;
  }
  return null;
}

function pickExternalNumber(legs, direction) {
  for (const leg of legs) {
    const ct = callTypeValue(leg);
    if (direction === 'inbound' && ct.includes('INBOUND')) {
      return cdrCallingNumber(leg) || cdrCallerIdNumber(leg);
    }
    if (direction === 'outbound' && ct.includes('OUTBOUND')) {
      return cdrCalledNumber(leg);
    }
  }
  const first = legs[0];
  if (!first) return null;
  if (direction === 'inbound') {
    return cdrCallingNumber(first) || cdrCallerIdNumber(first);
  }
  return cdrCalledNumber(first);
}

function pickStoreMainNumber(legs) {
  for (const leg of legs) {
    const main = cdrSiteMainNumber(leg);
    if (main) return main;
  }
  const entry = findInboundEntryLeg(legs);
  if (entry && classifyCallDirection(legs) === 'inbound') {
    return cdrCalledNumber(entry);
  }
  return null;
}

function pickTerminalOutcome(legs) {
  const phoneLegs = legs.filter(isUserPhoneLeg);
  const candidates = phoneLegs.length ? phoneLegs : legs;
  let chosen = candidates[candidates.length - 1];
  for (const leg of candidates) {
    if (cdrField(leg, 'Call outcome', 'call outcome')) {
      chosen = leg;
    }
  }
  const outcome = cdrField(chosen, 'Call outcome', 'call outcome') || 'unknown';
  const reason = cdrField(chosen, 'Call outcome reason', 'call outcome reason') || '';
  return {
    outcome,
    reason,
    disposition: formatCallDisposition(outcome, reason),
    normal: isNormalCallOutcome(chosen),
  };
}

function summarizeReach(legs, direction) {
  const phoneLegs = legs.filter(isUserPhoneLeg);
  const answeredPhone = phoneLegs.find(isTruthyAnswered);
  const aaLegs = legs.filter(isAutomatedAttendantLeg);
  const answeredAa = aaLegs.find(isTruthyAnswered);

  if (direction === 'inbound') {
    return {
      reachedPhone: Boolean(answeredPhone),
      reachedAttendant: Boolean(answeredAa),
      endpointUser: answeredPhone ? cdrUserName(answeredPhone) : null,
      endpointModel: answeredPhone ? cdrModel(answeredPhone) : null,
      aaKeyPress: aaLegs.map((l) => cdrField(l, 'Auto Attendant Key Pressed', 'auto attendant key pressed'))
        .find((v) => v && v !== 'NA') || null,
    };
  }

  const originating = findOutboundOriginatingLeg(legs);
  const remoteAnswered = legs.some((l) =>
    cdrDirectionValue(l).includes('TERMINAT') && isTruthyAnswered(l) && !isAutomatedAttendantLeg(l),
  );
  return {
    reachedPhone: Boolean(originating && isTruthyAnswered(originating)),
    connected: remoteAnswered || Boolean(originating && isTruthyAnswered(originating)),
    endpointUser: originating ? cdrUserName(originating) : null,
    endpointModel: originating ? cdrModel(originating) : null,
    reachedAttendant: false,
    aaKeyPress: null,
  };
}

/**
 * @param {object} call
 * @returns {string}
 */
export function assignCallBucket(call) {
  if (call.direction === 'inbound') {
    if (call.reachedPhone) return CALL_BUCKETS.inboundReachedPhone;
    if (call.reachedAttendant) return CALL_BUCKETS.inboundAaOnly;
    return CALL_BUCKETS.other;
  }
  if (call.direction === 'outbound') {
    if (call.connected || call.reachedPhone) return CALL_BUCKETS.outboundConnected;
    return CALL_BUCKETS.other;
  }
  return CALL_BUCKETS.other;
}

/**
 * @param {object[]} calls
 */
export function groupCallsByBucket(calls) {
  const buckets = {
    [CALL_BUCKETS.inboundReachedPhone]: [],
    [CALL_BUCKETS.inboundAaOnly]: [],
    [CALL_BUCKETS.outboundConnected]: [],
    [CALL_BUCKETS.other]: [],
  };
  for (const call of calls || []) {
    buckets[assignCallBucket(call)].push(call);
  }
  return buckets;
}

/**
 * @param {object[]} calls
 */
export function filterAbnormalCalls(calls) {
  return (calls || []).filter((c) => c.abnormal || !c.normalOutcome);
}

/**
 * @param {object[]} rawLegs
 * @returns {object}
 */
export function summarizeCallGroup(correlationId, rawLegs) {
  const legs = [...(rawLegs || [])].sort((a, b) => {
    const ta = new Date(cdrStartTime(a) || 0).getTime();
    const tb = new Date(cdrStartTime(b) || 0).getTime();
    return ta - tb;
  });
  const direction = classifyCallDirection(legs);
  const entryLeg = findInboundEntryLeg(legs);
  const phoneLeg = findUserPhoneLeg(legs);
  const outboundOrig = findOutboundOriginatingLeg(legs);
  const storeMain = pickStoreMainNumber(legs);

  const starts = legs.map((l) => cdrStartTime(l)).filter(Boolean);
  const start = starts.length ? starts.sort()[0] : null;
  const releaseTimes = legs.map((l) => cdrField(l, 'Release time', 'release time')).filter(Boolean);
  const end = releaseTimes.length ? releaseTimes.sort().reverse()[0] : null;
  const duration = (() => {
    if (start && end) {
      return Math.max(0, Math.round((new Date(end).getTime() - new Date(start).getTime()) / 1000));
    }
    return Math.max(...legs.map(cdrDurationSeconds), 0);
  })();

  const outcome = pickTerminalOutcome(legs);
  const reach = summarizeReach(legs, direction);
  const abnormal = legs.some((l) => !isNormalCallOutcome(l));
  const finalNumber = pickFinalNumber(legs, storeMain, phoneLeg);
  const callingLineId = pickCallingLineId(legs, direction);

  let leftParty;
  let rightParty;
  if (direction === 'inbound') {
    leftParty = {
      lineId: callingLineId,
      number: pickExternalNumber(legs, direction) || cdrCallingNumber(entryLeg),
    };
    rightParty = {
      main: storeMain || cdrCalledNumber(entryLeg),
      final: finalNumber,
      model: reach.endpointModel,
      user: reach.endpointUser,
    };
  } else if (direction === 'outbound') {
    leftParty = {
      user: reach.endpointUser || cdrUserName(outboundOrig),
      number: cdrUserNumber(outboundOrig) || cdrCallingNumber(outboundOrig),
      model: reach.endpointModel || (outboundOrig ? cdrModel(outboundOrig) : null),
    };
    rightParty = {
      number: pickExternalNumber(legs, direction) || cdrCalledNumber(legs[legs.length - 1]),
    };
  } else {
    leftParty = { number: cdrCallingNumber(legs[0]) };
    rightParty = { number: cdrCalledNumber(legs[legs.length - 1]) };
  }

  return {
    correlationId,
    direction,
    start,
    end,
    duration,
    callingLineId,
    callingNumber: leftParty.number || pickExternalNumber(legs, direction),
    calledNumber: direction === 'inbound'
      ? (storeMain || cdrCalledNumber(entryLeg))
      : (rightParty.number || cdrCalledNumber(legs[legs.length - 1])),
    storeMainNumber: storeMain,
    finalNumber,
    model: reach.endpointModel || (phoneLeg ? cdrModel(phoneLeg) : null),
    disposition: outcome.disposition,
    outcome: outcome.outcome,
    outcomeReason: outcome.reason,
    normalOutcome: outcome.normal && !abnormal,
    abnormal,
    legCount: legs.length,
    leftParty,
    rightParty,
    bucket: null,
    ...reach,
    legs,
  };
}

/**
 * @param {object[]} rawItems deduped cdr_feed rows
 * @returns {object[]}
 */
export function groupCdrIntoCalls(rawItems) {
  const groups = new Map();
  for (const item of rawItems || []) {
    const corr = cdrCorrelationId(item);
    const key = corr
      ? `corr:${corr}`
      : `solo:${cdrRecordId(item) || cdrDedupKey(item)}`;
    if (!groups.has(key)) groups.set(key, { correlationId: corr, legs: [] });
    groups.get(key).legs.push(item);
  }

  return [...groups.values()]
    .map((g) => {
      const call = summarizeCallGroup(g.correlationId, g.legs);
      call.bucket = assignCallBucket(call);
      return call;
    })
    .sort((a, b) => new Date(a.start || 0).getTime() - new Date(b.start || 0).getTime());
}

export function summarizeCalls(calls) {
  let inbound = 0;
  let outbound = 0;
  let unknown = 0;
  let inboundReachedPhone = 0;
  let inboundAaOnly = 0;
  let outboundConnected = 0;
  let abnormal = 0;

  for (const call of calls) {
    if (call.direction === 'inbound') {
      inbound++;
      if (call.reachedPhone) inboundReachedPhone++;
      else if (call.reachedAttendant) inboundAaOnly++;
    } else if (call.direction === 'outbound') {
      outbound++;
      if (call.connected || call.reachedPhone) outboundConnected++;
    } else {
      unknown++;
    }
    if (call.abnormal || !call.normalOutcome) abnormal++;
  }

  const outcomes = {};
  for (const call of calls) {
    const key = call.disposition || [call.outcome, call.outcomeReason].filter(Boolean).join(' / ') || 'unknown';
    outcomes[key] = (outcomes[key] || 0) + 1;
  }

  return {
    total: calls.length,
    inbound,
    outbound,
    unknown,
    inboundReachedPhone,
    inboundAaOnly,
    outboundConnected,
    abnormal,
    outcomes,
  };
}