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const characterAmountRange = document.getElementById('characterAmountRange')

const characterAmountNumber = document.getElementById('characterAmountNumber')

const includeUppercaseElement = document.getElementById('includeUppercase')

const includeNumbersElement = document.getElementById('includeNumbers')

const includeSymbolsElement = document.getElementById('includeSymbols')

const form = document.getElementById('passwordGeneratorForm')

const passwordDisplay = document.getElementById('passwordDisplay')

const UPPERCASE_CHAR_CODES = arrayFromLowToHigh(65, 90)

const LOWERCASE_CHAR_CODES = arrayFromLowToHigh(97, 122)

const NUMBER_CHAR_CODES = arrayFromLowToHigh(48, 57)

const SYMBOL_CHAR_CODES = arrayFromLowToHigh(33, 47).concat(

arrayFromLowToHigh(58, 64)

).concat(

arrayFromLowToHigh(91, 96)

).concat(

arrayFromLowToHigh(123, 126)

)

characterAmountNumber.addEventListener('input', syncCharacterAmount)

characterAmountRange.addEventListener('input', syncCharacterAmount)

form.addEventListener('submit', e => {

e.preventDefault()

const characterAmount = characterAmountNumber.value

const includeUppercase = includeUppercaseElement.checked

const includeNumbers = includeNumbersElement.checked

const includeSymbols = includeSymbolsElement.checked

const password = generatePassword(characterAmount, includeUppercase, includeNumbers, includeSymbols)

passwordDisplay.innerText = password

})

function generatePassword(characterAmount, includeUppercase, includeNumbers, includeSymbols) {

let charCodes = LOWERCASE_CHAR_CODES

if (includeUppercase) charCodes = charCodes.concat(UPPERCASE_CHAR_CODES)

if (includeSymbols) charCodes = charCodes.concat(SYMBOL_CHAR_CODES)

if (includeNumbers) charCodes = charCodes.concat(NUMBER_CHAR_CODES)

const passwordCharacters = []

for (let i = 0; i < characterAmount; i++) {

const characterCode = charCodes[Math.floor(Math.random() * charCodes.length)]

passwordCharacters.push(String.fromCharCode(characterCode))

}

return passwordCharacters.join('')

}

function arrayFromLowToHigh(low, high) {

const array = []

for (let i = low; i <= high; i++) {

array.push(i)

}

return array

}

function syncCharacterAmount(e) {

const value = e.target.value

characterAmountNumber.value = value

characterAmountRange.value = value

}