JS-Calculator/script.js at main · 4lvarofilho/JS-Calculator · GitHub

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let count = []
let saveAction

const MAX_VISOR_CHAR = 10

function AddNumber(num) {
  document.getElementById("total").removeAttribute("hidden")
  if (document.getElementById("total").innerHTML.length < MAX_VISOR_CHAR) {
    document.getElementById("total").innerHTML += num
  }

}

function CalcAction(action) {
  var currentNumber = document.getElementById("total").innerHTML

  if (currentNumber.length === 0) { return }

  count.push(Number(document.getElementById("total").innerHTML))

  if (currentNumber.split('')[currentNumber.length - 1] == '.') {
    document.getElementById("accumulator").removeAttribute("hidden")
    document.getElementById("accumulator").innerHTML += ` ${document.getElementById("total").innerHTML}0 ${action}`
  }
  else {
    document.getElementById("accumulator").removeAttribute("hidden")
    document.getElementById("accumulator").innerHTML += ` ${document.getElementById("total").innerHTML} ${action}`
  }

  document.getElementById("total").innerHTML = ""

  count.push(action)
}

function AddComma() {
  var currentNumber = document.getElementById("total").innerHTML

  if (currentNumber == '') {
    document.getElementById("total").removeAttribute("hidden")
    document.getElementById("total").innerHTML = "0."
  }
  else if (!currentNumber.includes(".")) {
    document.getElementById("total").innerHTML += "."
  }

}

function Result() {
  currentAccum = document.getElementById("accumulator").innerHTML
  currentNumber = document.getElementById("total").innerHTML

  if (currentAccum[currentAccum.length - 1] === "=" && currentNumber.length > 0) {
    document.getElementById("total").innerHTML = ProcessAction(Number(currentNumber), Number(currentNumber), saveAction).toString().substring(0, MAX_VISOR_CHAR)
  }

  if (count.length === 0) { return }

  count.push(Number(document.getElementById("total").innerHTML))
  document.getElementById("accumulator").innerHTML += ` ${document.getElementById("total").innerHTML} =`
  ProccessResult()
}


function ProccessResult() {
  let action = null
  let current = null

  let total = 0;

  if (isNaN(count[count.length - 1])) {
    count.pop()
  }

  count.forEach(n => {
    if (!isNaN(n)) {
      if (current == null) {
        current = n
      } else {
        total += ProcessAction(current, n, action)
        current = null
      }
    } else {
      action = n
      saveAction = n
    }
  })

  if (current != null) {
    total = ProcessAction(total, current, action)
  }

  document.getElementById("total").innerHTML = total.toString().substring(0, MAX_VISOR_CHAR)
  count = []

}

function ProcessAction(num1, num2, action) {
  switch (action) {
    case '+':
      return num1 + num2;
    case '-':
      return num1 - num2;
    case 'x':
      return num1 * num2;
    case '/':
      if (num2 === 0) {
        alert("Division by zero is not allowed")
        throw new Error("Error");
      }
      return num1 / num2;
    default:
      throw new Error("Invalid operation: " + action);
  }
}


function CleanCurrentEntry() {
  document.getElementById("total").innerHTML = ""
}

function CleanAll() {
  document.getElementById("total").innerHTML = ""
  document.getElementById("accumulator").innerHTML = ""
  count = []
}

function Percentage() {
  var currentNumber = document.getElementById("total").innerHTML
  if (currentNumber != "") {
    document.getElementById("total").innerHTML = Number(document.getElementById("total").innerHTML) / 100
  }
}