function randomCaracteres(str) {
  const arr = str.split("");
  let numberArray = arr.length;
  for (numberArray -= 1; numberArray > 0; numberArray--) { 
    let caracteresRandom = Math.floor(Math.random() * (numberArray + 1));
    [arr[numberArray], arr[caracteresRandom]] = [arr[caracteresRandom], arr[numberArray]];
  }
  return arr.join("");
} 

function generatePassword() {
  let randomPassword = randomCaracteres(randomNumber + randomBigString + randomString + specialCharacters);
  randomPassword.split("");

  let characterValue = document.getElementById('charactervalue');
  let allowLargePrint = document.getElementById('allowlargeprint').checked;
  let allowNumbers = document.getElementById("allownumbers").checked;
  let allowSpecialCharacters = document.getElementById("allowspecialsharacters").checked;
  
  if (!allowLargePrint) {
    const removeLargePrints =  ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
    removeLargePrints.forEach(char => {
      randomPassword = randomPassword.split(char).join('');
    });
  }

  if (!allowNumbers) {
    const removeNumbers = ["1","2","3","4","5","6","7","8","9","0"];
    removeNumbers.forEach(char => {
      randomPassword = randomPassword.split(char).join('');
    });
  }

  if (!allowSpecialCharacters) {
    const removeSpecialCharacters = ["!","@","#","$","%","&","*","~","?","/"];
    removeSpecialCharacters.forEach(char => {
      randomPassword = randomPassword.split(char).join('');
    });
  }

  let desiredPassword = randomPassword.slice(0, characterValue.value);
  console.log(`A senha desejada é: ${desiredPassword}`);

  let passwordResult = document.getElementById("passwordresult");
  passwordResult.value = desiredPassword;
}

const randomString = randomCaracteres("abcdefghijklmnopqrstuvwxyz");
console.log(randomString);

const randomNumber = randomCaracteres("1234567890");
console.log(randomNumber);

const randomBigString = randomCaracteres("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
console.log(randomBigString);

const specialCharacters = randomCaracteres("!@#$%&*~?/");