/*jshint multistr: true */

// ==================================================================== //
// Code to set up the calculator Buttons.  You can ignore this section  //
// ==================================================================== //

// ============ Define HTML elements ================= //

  var scientificCalcHtml = '<FORM ID="Calc"> \
    <TABLE BORDER=4> \
    <TR> \
    <TD> \
    <INPUT TYPE="text"   ID="display" VALUE="0"> \
    <br> \
    </TD> \
    </TR> \
    <TR> \
    <TD> \
    <INPUT TYPE="button" ID="one"   VALUE="  1  "> \
    <INPUT TYPE="button" ID="two"   VALUE="  2  "> \
    <INPUT TYPE="button" ID="three" VALUE="  3  "> \
    <INPUT TYPE="button" ID="times"  VALUE="  x  "> \
    <br> \
    <INPUT TYPE="button" ID="four"  VALUE="  4  "> \
    <INPUT TYPE="button" ID="five"  VALUE="  5  "> \
    <INPUT TYPE="button" ID="six"   VALUE="  6  "> \
    <INPUT TYPE="button" ID="divide" VALUE="  /  "> \
    <br> \
    <INPUT TYPE="button" ID="seven" VALUE="  7  "> \
    <INPUT TYPE="button" ID="eight" VALUE="  8  "> \
    <INPUT TYPE="button" ID="nine"  VALUE="  9  "> \
    <INPUT TYPE="button" ID="plus" VALUE="  +  "> \
    <br> \
    <INPUT TYPE="button" ID="clear" VALUE=" clr "> \
    <INPUT TYPE="button" ID="zero"  VALUE="  0  "> \
    <INPUT TYPE="button" ID="equals"  VALUE="  =  "> \
    <INPUT TYPE="button" ID="minus"   VALUE="  -  "> \
    <br> \
    <br> \
    <!-- Scientific buttons --> \
    <INPUT TYPE="button" ID="square"  VALUE= "x^2"> \
    <INPUT TYPE="button" ID="exp"  VALUE= " x^y "> \
    <INPUT TYPE="button" ID="sqrt"  VALUE= " sqrt"> \
    <INPUT TYPE="button" ID="factorial"  VALUE= "  !  "> \
    <br> \
    <!-- "Extra" buttons.  Students can program these to do anything.  --> \
    <INPUT TYPE="button" ID="ex1"  VALUE= "ex1"> \
    <INPUT TYPE="button" ID="ex2"  VALUE= "ex2"> \
    <INPUT TYPE="button" ID="ex3"  VALUE= "ex3"> \
    <!-- "PlusMinus" or Negation button. --> \
    <INPUT TYPE="button" ID="+-"  VALUE= "+/-"> \
    </TABLE> \
    </FORM>'

var testCasesHTML = '<DIV ID="tests"> \
  <TEXTAREA rows="14" cols="105" ID="progressBar" value="No Tests Run So Far"></TEXTAREA> \
  <br> \
  <INPUT TYPE="button" ID="runTests" VALUE="Run Tests"> \
  </TABLE> \
  </DIV>'

// ============ Define Calculator Button Testcases ================= //
var testCases = [];

function RegisterTestcase(fn) {
  testCases.push(fn);
}

function TestClear() {
  var testResult = "TEST FAILED [TestClear]:  Set Display to 15, Pressed clr.  Expected display to say 0.\n";

  SetDisplayValue(15)
  OnPressClear()
  if (GetDisplayValue() === 0) {testResult= "TEST PASSED [TestClear]\n"}

  return testResult
}

RegisterTestcase(TestClear)

function TestNumbers() {
  var testResult = "TEST FAILED [TestNumbers]:  Pressed 2, 5, 1, 3, 4, 0, 9, 6, 8, 7.  Expected display to say 2513409687.\n";

  // Enter the number 2513409687
  OnPressClear()
  OnPressTwo();
  OnPressFive()
  OnPressOne()
  OnPressThree()
  OnPressFour()
  OnPressZero()
  OnPressNine()
  OnPressSix()
  OnPressEight()
  OnPressSeven()

  // Make sure that number was actually entered into the display.
  if (2513409687 === GetDisplayValue()) {testResult = "TEST PASSED [TestNumbers]\n"}

  return testResult;
}

RegisterTestcase(TestNumbers)

function TestMultiply() {
  var testResult = "TEST FAILED [TestMultiply]:  Pressed clr, 6, x, 4, =.  Expected display to say 24.\n";

  OnPressClear();
  OnPressSix();
  OnPressTimes();
  OnPressFour();
  OnPressEquals();

  if (24 === GetDisplayValue()) {testResult = "TEST PASSED [TestMultiply]\n"}

  return testResult;
}

RegisterTestcase(TestMultiply)

function TestDivide() {
  var TestName = "[TestDivide]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 6, /, 2, =.  Expected display to say 3.\n";

  OnPressClear();
  OnPressSix();
  OnPressDivide();
  OnPressTwo();
  OnPressEquals();

  if (3 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestDivide)

function TestAdd() {
  var TestName = "[TestAdd]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 6, +, 8, =.  Expected display to say 14.\n";

  OnPressClear();
  OnPressSix();
  OnPressPlus();
  OnPressEight();
  OnPressEquals();

  if (14 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestAdd)

function TestSubtract() {
  var TestName = "[TestSubtract]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 5, -, 9, =.  Expected display to say -4.\n";

  OnPressClear();
  OnPressFive();
  OnPressMinus();
  OnPressNine();
  OnPressEquals();

  if (-4 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestSubtract)

function TestSquare() {
  var TestName = "[TestSquare]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 7, x^2.  Expected display to say 49.\n";

  OnPressClear();
  OnPressSeven();
  OnPressSquare();

  if (49 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestSquare)

function TestExponent() {
  var TestName = "[TestExponentiation]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 5, x^y, 3, =.  Expected display to say 125.\n";

  OnPressClear();
  OnPressFive();
  OnPressExp();
  OnPressThree();
  OnPressEquals();

  if (125 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestExponent)

function TestSqrt() {
  var TestName = "[TestSqrt]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 5, sqrt.  Expected display to say 2.\n";

  OnPressClear();
  OnPressFive();
  OnPressSqrt();

  if (2 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestSqrt)

function TestFactorial() {
  var TestName = "[TestFactorial]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 5, !.  Expected display to say 120.\n";

  OnPressClear();
  OnPressFive();
  OnPressFactorial();

  if (120 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestFactorial)

function TestPlusMinus() {
  var TestName = "[TestPlusMinus]"
  var testResult = "TEST FAILED " + TestName + ":  Pressed clr, 5, +/-.  Expected display to say -5.\n";

  OnPressClear();
  OnPressFive();
  OnPressPlusMinus();

  if (-5 === GetDisplayValue()) {testResult = "TEST PASSED " + TestName + "\n"}

  return testResult
}

RegisterTestcase(TestPlusMinus)


// ============ Define Calculator Display Functions ================= //
function GetDisplayValue() {
  return parseInt(document.getElementById("display").value);
}

function SetDisplayValue(value) {
  if (!isNaN(value)) {
    if (value > 0) { value = Math.floor(value) }
    if (value < 0) { value = Math.ceil(value) }
    document.getElementById("display").value = value;
  }
}

function SetErrorMessage(value) {
  document.getElementById("display").value = "Error: " + value;
}

// ============ Define Testcase Functions ================= //
function OnRunTests() {
  function appendTestResult(item, index) {
    document.getElementById("progressBar").value += item()
  }

  document.getElementById("progressBar").value = ""
  testCases.forEach(appendTestResult)
  var d = new Date()
  document.getElementById("progressBar").value += "\n"
  document.getElementById("progressBar").value += "Ran " + testCases.length + " testcases at " + d.getHours() % 12 +  ":" + d.getMinutes() + ":" + d.getSeconds() + (d.getHours() > 12 ? " PM" : " AM");
  OnPressClear();
  SetDisplayValue(0);
}

// ============ Override cycle shell main function ================= //

function setup (input) {
  var body = document.body;

  body.innerHTML = scientificCalcHtml + '<br>' + testCasesHTML;

  document.getElementById("one").onclick = OnPressOne;
  document.getElementById("two").onclick = OnPressTwo;
  document.getElementById("three").onclick = OnPressThree;
  document.getElementById("four").onclick = OnPressFour;
  document.getElementById("five").onclick = OnPressFive;
  document.getElementById("six").onclick = OnPressSix;
  document.getElementById("seven").onclick = OnPressSeven;
  document.getElementById("eight").onclick = OnPressEight;
  document.getElementById("nine").onclick = OnPressNine;
  document.getElementById("zero").onclick = OnPressZero;

  document.getElementById("clear").onclick = OnPressClear;
  document.getElementById("equals").onclick = OnPressEquals;

  document.getElementById("plus").onclick = OnPressPlus;
  document.getElementById("minus").onclick = OnPressMinus;
  document.getElementById("times").onclick = OnPressTimes;
  document.getElementById("divide").onclick = OnPressDivide;

  document.getElementById("square").onclick = OnPressSquare;
  document.getElementById("sqrt").onclick = OnPressSqrt;
  document.getElementById("factorial").onclick = OnPressFactorial;
  document.getElementById("exp").onclick = OnPressExp;

  document.getElementById("ex1").onclick = OnPressEx1;
  document.getElementById("ex2").onclick = OnPressEx2;
  document.getElementById("ex3").onclick = OnPressEx3;
  document.getElementById("+-").onclick = OnPressPlusMinus;

  //TODO:  Enable this.
  document.getElementById("runTests").onclick = OnRunTests;

}

setup()

// ======================================================== //
// ======================================================== //
// ============== Your Code Starts Here! ================== //
// ======================================================== //
// ======================================================== //

//
// Special Key Functions
//

function OnPressClear() {
  SetDisplayValue(0)
}

function OnPressEquals() {
}

//
// Number Functions
//

function OnPressOne() {
  if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 1)
  }

  else{
  SetDisplayValue(1)
  }
}



function OnPressTwo() {
   if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 2)
  }

  else{
  SetDisplayValue(2)
  }
}

function OnPressThree() {
  if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 3)
  }

  else{
  SetDisplayValue(3)
  }

}

function OnPressFour() {
  if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 4)
  }

  else{
  SetDisplayValue(4)
  }
}

function OnPressFive() {
    if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 5)
  }

  else{
  SetDisplayValue(5)
  }

}

function OnPressSix() {
     if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 6)
  }

  else{
  SetDisplayValue(6)
  }

}

function OnPressSeven() {
      if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 7)
  }

  else{
  SetDisplayValue(7)
  }

}

function OnPressEight() {
      if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 8)
  }

  else{
  SetDisplayValue(8)
  }

}

function OnPressNine() {
    if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 9)
  }

  else{
  SetDisplayValue(9)
  }

}

function OnPressZero() {
      if (GetDisplayValue() > 0){
  SetDisplayValue(GetDisplayValue()*10 + 0)
  }

  else{
  SetDisplayValue(0)
  }

}

//
// Arithmetic functions
//

function OnPressPlus() {
}

function OnPressMinus() {
}

function OnPressDivide() {
}

function OnPressTimes() {
}

//
// Scientific functions
//

function OnPressFactorial() {
}

function OnPressSquare() {
}

function OnPressExp() {
}

function OnPressSqrt() {
}

function OnPressEx1() {

  SetDisplayValue (2513409687)

}

function OnPressEx2() {
  SetDisplayValue()
}

function OnPressEx3() {
  SetDisplayValue()
}

function OnPressPlusMinus() {
}