main.js

const pwE1 = document.getElementById("pw");
const copyE1 = document.getElementById("copy");
const lenE1 = document.getElementById("len");
const upperE1 = document.getElementById("upper");
const lowerE1 = document.getElementById("lower");
const numberE1 = document.getElementById("number");
const symbolE1 = document.getElementById("symbol");
const generateE1 = document.getElementById("generate");

const upperLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const lowerLetters = "abcdefghijklmnopqrstuvwxyz";
const numbers = "0123456789";
const symbols = "!@#$%^&*()_+=";

function getLowercase() {
  return lowerLetters[Math.floor(Math.random() * lowerLetters.length)];
}

function getUppercase() {
  return upperLetters[Math.floor(Math.random() * upperLetters.length)];
}

function getNumber() {
  return numbers[Math.floor(Math.random() * numbers.length)];
}

function getSymbol() {
  return symbols[Math.floor(Math.random() * symbols.length)];
}

function generatePassword() {
  const len = lenE1.value;

  let password = "";

  if(upperE1.checked) {
    password += getUppercase();
  }

  if(lowerE1.checked) {
    password += getLowercase();
  }

  if(numberE1.checked) {
    password += getNumber();
  }

  if(symbolE1.checked) {
    password += getSymbol();
  }

  for(let i = password.length; i < len; i++) {
    const x = generateX();
    password += x;
  }

  pwE1.innerText = password;
}

function generateX() {
  const xs = [];
  if (upperE1.checked) {
    xs.push(getUppercase());
  }

  if (lowerE1.checked) {
    xs.push(getLowercase());

  }

  if(numberE1.checked) {
    xs.push(getNumber());
  }

  if (symbolE1.checked) {
    xs.push(getSymbol());
  }

  if (xs.length === 0) return"";

  return xs[Math.floor(Math.random() * xs.length)];
}

generateE1.addEventListener("click", generatePassword);

copyE1.addEventListener("click", () => {
  const textarea = document.createElement("textarea");
  const password = pwE1.innerText;

  if (!password) {
    return;
  }

  textarea.value = password;
  document.body.appendChild(textarea);
  textarea.select();
  document.execCommand("copy");
  textarea.remove();
  alert("Password copied to clipboard");

});