// https://github.com/RateGravity/parse-full-name/blob/master/index.js
module.exports = (nameToParse, partToReturn, fixCase, stopOnError, useLongLists) => {

  var i, j, k, l, m, n, part, comma, titleList, suffixList, prefixList, regex,
    partToCheck, partFound, partsFoundCount, firstComma, remainingCommas,
    nameParts = [], nameCommas = [null], partsFound = [],
    conjunctionList = ['&', 'and', 'et', 'e', 'of', 'the', 'und', 'y'],
    parsedName = {
      title: '', first: '', middle: '', last: '', nick: '', suffix: '', error: []
    };

  // Validate inputs, or set to defaults
  partToReturn = partToReturn && ['title', 'first', 'middle', 'last', 'nick',
    'suffix', 'error'].indexOf(partToReturn.toLowerCase()) > -1 ?
    partToReturn.toLowerCase() : 'all';
  // 'all' = return object with all parts, others return single part
  if (fixCase === false) fixCase = 0;
  if (fixCase === true) fixCase = 1;
  fixCase = fixCase !== 'undefined' && (fixCase === 0 || fixCase === 1) ?
    fixCase : -1; // -1 = fix case only if input is all upper or lowercase
  if (stopOnError === true) stopOnError = 1;
  stopOnError = stopOnError && stopOnError === 1 ? 1 : 0;
  // false = output warnings on parse error, but don't stop
  if (useLongLists === true) useLongLists = 1;
  useLongLists = useLongLists && useLongLists === 1 ? 1 : 0; // 0 = short lists

  // If stopOnError = 1, throw error, otherwise return error messages in array
  function handleError(errorMessage) {
    if (stopOnError) {
      throw 'Error: ' + errorMessage;
    } else {
      parsedName.error.push('Error: ' + errorMessage);
    }
  }

  // If fixCase = 1, fix case of parsedName parts before returning
  function fixParsedNameCase(fixedCaseName, fixCaseNow) {
    var forceCaseList = ['e', 'y', 'av', 'af', 'da', 'dal', 'de', 'del', 'der', 'di',
      'la', 'le', 'van', 'der', 'den', 'vel', 'von', 'II', 'III', 'IV', 'J.D.', 'LL.M.',
      'M.D.', 'D.O.', 'D.C.', 'Ph.D.'];
    var forceCaseListIndex;
    var namePartLabels = [];
    var namePartWords;
    if (fixCaseNow) {
      namePartLabels = Object.keys(parsedName)
        .filter(function (v) { return v !== 'error'; });
      for (i = 0, l = namePartLabels.length; i < l; i++) {
        if (fixedCaseName[namePartLabels[i]]) {
          namePartWords = (fixedCaseName[namePartLabels[i]] + '').split(' ');
          for (j = 0, m = namePartWords.length; j < m; j++) {
            forceCaseListIndex = forceCaseList
              .map(function (v) { return v.toLowerCase(); })
              .indexOf(namePartWords[j].toLowerCase());
            if (forceCaseListIndex > -1) { // Set case of words in forceCaseList
              namePartWords[j] = forceCaseList[forceCaseListIndex];
            } else if (namePartWords[j].length === 1) { // Uppercase initials
              namePartWords[j] = namePartWords[j].toUpperCase();
            } else if (
              namePartWords[j].length > 2 &&
              namePartWords[j].slice(0, 1) ===
              namePartWords[j].slice(0, 1).toUpperCase() &&
              namePartWords[j].slice(1, 2) ===
              namePartWords[j].slice(1, 2).toLowerCase() &&
              namePartWords[j].slice(2) ===
              namePartWords[j].slice(2).toUpperCase()
            ) { // Detect McCASE and convert to McCase
              namePartWords[j] = namePartWords[j].slice(0, 3) +
                namePartWords[j].slice(3).toLowerCase();
            } else if (
              namePartLabels[j] === 'suffix' &&
              namePartWords[j].slice(-1) !== '.' &&
              !suffixList.indexOf(namePartWords[j].toLowerCase())
            ) { // Convert suffix abbreviations to UPPER CASE
              if (namePartWords[j] === namePartWords[j].toLowerCase()) {
                namePartWords[j] = namePartWords[j].toUpperCase();
              }
            } else { // Convert to Title Case
              namePartWords[j] = namePartWords[j].slice(0, 1).toUpperCase() +
                namePartWords[j].slice(1).toLowerCase();
            }
          }
          fixedCaseName[namePartLabels[i]] = namePartWords.join(' ');
        }
      }
    }
    return fixedCaseName;
  }

  // If no input name, or input name is not a string, abort
  if (!nameToParse || typeof nameToParse !== 'string') {
    handleError('No input');
    parsedName = fixParsedNameCase(parsedName, fixCase);
    return partToReturn === 'all' ? parsedName : parsedName[partToReturn];
  } else {
    nameToParse = nameToParse.trim();
  }

  // Auto-detect fixCase: fix if nameToParse is all upper or all lowercase
  if (fixCase === -1) {
    fixCase = (
      nameToParse === nameToParse.toUpperCase() ||
        nameToParse === nameToParse.toLowerCase() ? 1 : 0
    );
  }

  // Initilize lists of prefixs, suffixs, and titles to detect
  // Note: These list entries must be all lowercase
  if (useLongLists) {
    suffixList = ['esq', 'esquire', 'jr', 'jnr', 'sr', 'snr', '2', 'ii', 'iii', 'iv',
      'v', 'clu', 'chfc', 'cfp', 'md', 'phd', 'j.d.', 'll.m.', 'm.d.', 'd.o.', 'd.c.',
      'p.c.', 'ph.d.'];
    prefixList = ['a', 'ab', 'antune', 'ap', 'abu', 'al', 'alm', 'alt', 'bab', 'bäck',
      'bar', 'bath', 'bat', 'beau', 'beck', 'ben', 'berg', 'bet', 'bin', 'bint', 'birch',
      'björk', 'björn', 'bjur', 'da', 'dahl', 'dal', 'de', 'degli', 'dele', 'del',
      'della', 'der', 'di', 'dos', 'du', 'e', 'ek', 'el', 'escob', 'esch', 'fleisch',
      'fitz', 'fors', 'gott', 'griff', 'haj', 'haug', 'holm', 'ibn', 'kauf', 'kil',
      'koop', 'kvarn', 'la', 'le', 'lind', 'lönn', 'lund', 'mac', 'mhic', 'mic', 'mir',
      'na', 'naka', 'neder', 'nic', 'ni', 'nin', 'nord', 'norr', 'ny', 'o', 'ua', 'ui\'',
      'öfver', 'ost', 'över', 'öz', 'papa', 'pour', 'quarn', 'skog', 'skoog', 'sten',
      'stor', 'ström', 'söder', 'ter', 'ter', 'tre', 'türk', 'van', 'väst', 'väster',
      'vest', 'von'];
    titleList = ['mr', 'mrs', 'ms', 'miss', 'dr', 'herr', 'monsieur', 'hr', 'frau',
      'a v m', 'admiraal', 'admiral', 'air cdre', 'air commodore', 'air marshal',
      'air vice marshal', 'alderman', 'alhaji', 'ambassador', 'baron', 'barones',
      'brig', 'brig gen', 'brig general', 'brigadier', 'brigadier general',
      'brother', 'canon', 'capt', 'captain', 'cardinal', 'cdr', 'chief', 'cik', 'cmdr',
      'coach', 'col', 'col dr', 'colonel', 'commandant', 'commander', 'commissioner',
      'commodore', 'comte', 'comtessa', 'congressman', 'conseiller', 'consul',
      'conte', 'contessa', 'corporal', 'councillor', 'count', 'countess',
      'crown prince', 'crown princess', 'dame', 'datin', 'dato', 'datuk',
      'datuk seri', 'deacon', 'deaconess', 'dean', 'dhr', 'dipl ing', 'doctor',
      'dott', 'dott sa', 'dr', 'dr ing', 'dra', 'drs', 'embajador', 'embajadora', 'en',
      'encik', 'eng', 'eur ing', 'exma sra', 'exmo sr', 'f o', 'father',
      'first lieutient', 'first officer', 'flt lieut', 'flying officer', 'fr',
      'frau', 'fraulein', 'fru', 'gen', 'generaal', 'general', 'governor', 'graaf',
      'gravin', 'group captain', 'grp capt', 'h e dr', 'h h', 'h m', 'h r h', 'hajah',
      'haji', 'hajim', 'her highness', 'her majesty', 'herr', 'high chief',
      'his highness', 'his holiness', 'his majesty', 'hon', 'hr', 'hra', 'ing', 'ir',
      'jonkheer', 'judge', 'justice', 'khun ying', 'kolonel', 'lady', 'lcda', 'lic',
      'lieut', 'lieut cdr', 'lieut col', 'lieut gen', 'lord', 'm', 'm l', 'm r',
      'madame', 'mademoiselle', 'maj gen', 'major', 'master', 'mevrouw', 'miss',
      'mlle', 'mme', 'monsieur', 'monsignor', 'mr', 'mrs', 'ms', 'mstr', 'nti', 'pastor',
      'president', 'prince', 'princess', 'princesse', 'prinses', 'prof', 'prof dr',
      'prof sir', 'professor', 'puan', 'puan sri', 'rabbi', 'rear admiral', 'rev',
      'rev canon', 'rev dr', 'rev mother', 'reverend', 'rva', 'senator', 'sergeant',
      'sheikh', 'sheikha', 'sig', 'sig na', 'sig ra', 'sir', 'sister', 'sqn ldr', 'sr',
      'sr d', 'sra', 'srta', 'sultan', 'tan sri', 'tan sri dato', 'tengku', 'teuku',
      'than puying', 'the hon dr', 'the hon justice', 'the hon miss', 'the hon mr',
      'the hon mrs', 'the hon ms', 'the hon sir', 'the very rev', 'toh puan', 'tun',
      'vice admiral', 'viscount', 'viscountess', 'wg cdr', 'ind', 'misc', 'mx'];
  } else {
    suffixList = ['esq', 'esquire', 'jr', 'jnr', 'sr', 'snr', '2', 'ii', 'iii', 'iv',
      'md', 'phd', 'j.d.', 'll.m.', 'm.d.', 'd.o.', 'd.c.', 'p.c.', 'ph.d.'];
    prefixList = ['ab', 'bar', 'bin', 'da', 'dal', 'de', 'de la', 'del', 'della', 'der',
      'di', 'du', 'ibn', 'l\'', 'la', 'le', 'san', 'st', 'st.', 'ste', 'ter', 'van',
      'van de', 'van der', 'van den', 'vel', 'ver', 'vere', 'von'];
    titleList = ['dr', 'miss', 'mr', 'mrs', 'ms', 'prof', 'sir', 'frau', 'herr', 'hr',
      'monsieur', 'captain', 'doctor', 'judge', 'officer', 'professor', 'ind', 'misc',
      'mx'];
  }

  // Nickname: remove and store parts with surrounding punctuation as nicknames
  regex = /\s(?:[‘’']([^‘’']+)[‘’']|[“”"]([^“”"]+)[“”"]|\[([^\]]+)\]|\(([^\)]+)\)),?\s/g;
  partFound = (' ' + nameToParse + ' ').match(regex);
  if (partFound) partsFound = partsFound.concat(partFound);
  partsFoundCount = partsFound.length;
  if (partsFoundCount === 1) {
    parsedName.nick = partsFound[0].slice(2).slice(0, -2);
    if (parsedName.nick.slice(-1) === ',') {
      parsedName.nick = parsedName.nick.slice(0, -1);
    }
    nameToParse = (' ' + nameToParse + ' ').replace(partsFound[0], ' ').trim();
    partsFound = [];
  } else if (partsFoundCount > 1) {
    handleError(partsFoundCount + ' nicknames found');
    for (i = 0; i < partsFoundCount; i++) {
      nameToParse = (' ' + nameToParse + ' ')
        .replace(partsFound[i], ' ').trim();
      partsFound[i] = partsFound[i].slice(2).slice(0, -2);
      if (partsFound[i].slice(-1) === ',') {
        partsFound[i] = partsFound[i].slice(0, -1);
      }
    }
    parsedName.nick = partsFound.join(', ');
    partsFound = [];
  }
  if (!nameToParse.trim().length) {
    parsedName = fixParsedNameCase(parsedName, fixCase);
    return partToReturn === 'all' ? parsedName : parsedName[partToReturn];
  }

  // Split remaining nameToParse into parts, remove and store preceding commas
  for (i = 0, n = nameToParse.split(' '), l = n.length; i < l; i++) {
    part = n[i];
    comma = null;
    if (part.slice(-1) === ',') {
      comma = ',';
      part = part.slice(0, -1);
    }
    nameParts.push(part);
    nameCommas.push(comma);
  }

  // Suffix: remove and store matching parts as suffixes
  for (l = nameParts.length, i = l - 1; i > 0; i--) {
    partToCheck = (nameParts[i].slice(-1) === '.' ?
      nameParts[i].slice(0, -1).toLowerCase() : nameParts[i].toLowerCase());
    if (
      suffixList.indexOf(partToCheck) > -1 ||
      suffixList.indexOf(partToCheck + '.') > -1
    ) {
      partsFound = nameParts.splice(i, 1).concat(partsFound);
      if (nameCommas[i] === ',') { // Keep comma, either before or after
        nameCommas.splice(i + 1, 1);
      } else {
        nameCommas.splice(i, 1);
      }
    }
  }
  partsFoundCount = partsFound.length;
  if (partsFoundCount === 1) {
    parsedName.suffix = partsFound[0];
    partsFound = [];
  } else if (partsFoundCount > 1) {
    handleError(partsFoundCount + ' suffixes found');
    parsedName.suffix = partsFound.join(', ');
    partsFound = [];
  }
  if (!nameParts.length) {
    parsedName = fixParsedNameCase(parsedName, fixCase);
    return partToReturn === 'all' ? parsedName : parsedName[partToReturn];
  }

  // Title: remove and store matching parts as titles
  for (l = nameParts.length, i = l - 1; i >= 0; i--) {
    partToCheck = (nameParts[i].slice(-1) === '.' ?
      nameParts[i].slice(0, -1).toLowerCase() : nameParts[i].toLowerCase());
    if (
      titleList.indexOf(partToCheck) > -1 ||
      titleList.indexOf(partToCheck + '.') > -1
    ) {
      partsFound = nameParts.splice(i, 1).concat(partsFound);
      if (nameCommas[i] === ',') { // Keep comma, either before or after
        nameCommas.splice(i + 1, 1);
      } else {
        nameCommas.splice(i, 1);
      }
    }
  }
  partsFoundCount = partsFound.length;
  if (partsFoundCount === 1) {
    parsedName.title = partsFound[0];
    partsFound = [];
  } else if (partsFoundCount > 1) {
    handleError(partsFoundCount + ' titles found');
    parsedName.title = partsFound.join(', ');
    partsFound = [];
  }
  if (!nameParts.length) {
    parsedName = fixParsedNameCase(parsedName, fixCase);
    return partToReturn === 'all' ? parsedName : parsedName[partToReturn];
  }

  // Join name prefixes to following names
  if (nameParts.length > 1) {
    for (i = nameParts.length - 2; i >= 0; i--) {
      if (prefixList.indexOf(nameParts[i].toLowerCase()) > -1) {
        nameParts[i] = nameParts[i] + ' ' + nameParts[i + 1];
        nameParts.splice(i + 1, 1);
        nameCommas.splice(i + 1, 1);
      }
    }
  }

  // Join conjunctions to surrounding names
  if (nameParts.length > 2) {
    for (i = nameParts.length - 3; i >= 0; i--) {
      if (conjunctionList.indexOf(nameParts[i + 1].toLowerCase()) > -1) {
        nameParts[i] = nameParts[i] + ' ' + nameParts[i + 1] + ' ' + nameParts[i + 2];
        nameParts.splice(i + 1, 2);
        nameCommas.splice(i + 1, 2);
        i--;
      }
    }
  }

  // Suffix: remove and store items after extra commas as suffixes
  nameCommas.pop();
  firstComma = nameCommas.indexOf(',');
  remainingCommas = nameCommas.filter(function (v) { return v !== null; }).length;
  if (firstComma > 1 || remainingCommas > 1) {
    for (i = nameParts.length - 1; i >= 2; i--) {
      if (nameCommas[i] === ',') {
        partsFound = nameParts.splice(i, 1).concat(partsFound);
        nameCommas.splice(i, 1);
        remainingCommas--;
      } else {
        break;
      }
    }
  }
  if (partsFound.length) {
    if (parsedName.suffix) {
      partsFound = [parsedName.suffix].concat(partsFound);
    }
    parsedName.suffix = partsFound.join(', ');
    partsFound = [];
  }

  // Last name: remove and store last name
  if (remainingCommas > 0) {
    if (remainingCommas > 1) {
      handleError((remainingCommas - 1) + ' extra commas found');
    }
    // Remove and store all parts before first comma as last name
    if (nameCommas.indexOf(',')) {
      parsedName.last = nameParts.splice(0, nameCommas.indexOf(',')).join(' ');
      nameCommas.splice(0, nameCommas.indexOf(','));
    }
  } else {
    // Remove and store last part as last name
    parsedName.last = nameParts.pop();
  }
  if (!nameParts.length) {
    parsedName = fixParsedNameCase(parsedName, fixCase);
    return partToReturn === 'all' ? parsedName : parsedName[partToReturn];
  }

  // First name: remove and store first part as first name
  parsedName.first = nameParts.shift();
  if (!nameParts.length) {
    parsedName = fixParsedNameCase(parsedName, fixCase);
    return partToReturn === 'all' ? parsedName : parsedName[partToReturn];
  }

  // Middle name: store all remaining parts as middle name
  if (nameParts.length > 2) {
    handleError(nameParts.length + ' middle names');
  }
  parsedName.middle = nameParts.join(' ');

  parsedName = fixParsedNameCase(parsedName, fixCase);
  return partToReturn === 'all' ? parsedName : parsedName[partToReturn];
};