const accents = 'áéíóú',
      chars = 'abcdefghijklmnopqrstuvwxyz',
      a = 'bcdfghijklmnpqrstuvwxyzñ',
      b = 'aeilorsuy',
      c = 'aeioruhtlkkkkkkkkk',
      d = 'aeiourldns',
      e = 'abcdefyrnsltmpxizñ',
      f = 'aeiouylrf',
      g = 'aeiouhrlmns',
      h = 'aeiourlt',
      i = 'encstoadlmvzrgfrtpbkñ',
      j = 'uaoei',
      k = 'eiaolunyhsrw',
      l = 'eiayoug',
      m = 'aeiouypb',
      n = 'aeiouytgdcsn',
      o = 'abcdefnruplsmtzñ',
      p = 'rehaoilhtusp',
      q = 'u',
      r = 'aeioutymscdrnpb',
      s = 'etshaicupomlynk',
      t = 'eiraohuytlar',
      u = 'bcdfghnslrmtiaepzñ',
      v = 'eiaour',
      w = 'aeiouyhrnls',
      x = 'aeiouytcpl',
      y = 'elstacpnm',
      z = 'eaioyuz',
      ñ = 'aeiou';

const rando = () => {
  try {
    let crypto
    try {
      crypto = require('crypto').randomFillSync
    } catch (_) {
      crypto = (window.crypto || window.msCrypto).getRandomValues
    }
    let cryptoRandoms
    const cryptoRandomSlices = []
    let cryptoRandom
    while ((cryptoRandom = '.' + cryptoRandomSlices.join('')).length < 30) {
      cryptoRandoms = crypto(new Uint32Array(5))
      for (let i = 0; i < cryptoRandoms.length; i++) {
        const cryptoRandomSlice = cryptoRandoms[i] < 4000000000 ? cryptoRandoms[i].toString().slice(1) : ''
        if (cryptoRandomSlice.length > 0) cryptoRandomSlices[cryptoRandomSlices.length] = cryptoRandomSlice
      }
    }
    return Number(cryptoRandom)
  } catch (_) {
    return Math.random()
  }
}

function rng (doAccents = true, min = 4, max = 8, length = Math.floor(rando() * (max - min + 1)) + min, firstChar = chars[Math.floor(rando() * chars.length)]) {
  let out = [];
  
  for (let index = 0; index < length; index++) {
    if (index == 0) {
      out.push(firstChar);
    } else {
      out.push(eval(out[index-1])[Math.floor(rando() * eval(out[index-1]).length)]);
    }
  }
  
  if (doAccents) {
    out = addAccents(out);
  }
  
  if (out[out.length-1] == "ñ") {
    out.push(ñ[Math.floor(rando() * ñ.length)]);
  }
  
  return [out[0].toUpperCase(), ...out.slice(1)].join('');
}

function addAccents(arr) {
  let hasAccent = false;
  let outVowels = arr.filter(a => ñ.includes(a));
  let lastVowel = outVowels[outVowels.length-1];
  
  for (let i = 0; i < arr.length; i++) {
    let char = arr[i];
    let newChar;
    
    if (rando() >= 0.5 && !hasAccent && ñ.includes(char)) {
      newChar = accents[ñ.indexOf(char)];
      hasAccent = true;
    } else if (lastVowel == char && !hasAccent) {
      newChar = accents[ñ.indexOf(char)];
      hasAccent = true;
    }
    
    arr[i] = newChar || char;
  }
  return arr;
}

for(let i = 0; i < 10; i++) {
  console.log(rng(true, 5, 6));
  console.log("");
  console.log(rng(false, 4, 8));
  console.log("");
}

// good names: garnguck, lemock, wemee, yermpoo, jelifyeshi, vazaji, zufazi, dupunt, trythluid

/* more good names:
  elóra, yáddro, lezíe, janeño, bahúz, gouñuña,
  volgrad, flizz, tunck, vorag, sylem, kitala, vunos, jaith, qumor, henup, ornda, zilep, cantadu, gromu, lodley
*/