script.js

var brokenCalculator = {
    difficulty: "",
    buttons: ["zero", "1", "2", "3", "4", "5", "6", "7", "8", "9", "add", "substract", "multiply", "divide", "sin", "cos", "equal", "ac"],
    brokenButtons: [""],
    goal: "",

    setEasy: function(){
        this.difficulty="Easy";
    },
    setMedium: function(){
        this.difficulty="Medium";
    },
    setHard: function(){
        this.difficulty="Hard";
    },
    breakButtons: function(){               //Breaks buttons depending on difficulty level
        if(this.difficulty == "Easy"){
            for(let i=0; i<3; i++){
                this.brokenButtons[i]=convertToButtonName(Math.floor(Math.random()*14));
                console.log(this.brokenButtons[i]);
                document.getElementById(this.brokenButtons[i]).style.backgroundColor = "black";
                document.getElementById(this.brokenButtons[i]).disabled = true;
            }
            console.log(this.brokenButtons);
        }
        else if(this.difficulty == "Medium"){
            for(let i=0; i<4; i++){
                this.brokenButtons[i]=convertToButtonName(Math.floor(Math.random()*14));
                console.log(this.brokenButtons[i]);
                document.getElementById(this.brokenButtons[i]).style.backgroundColor = "black";
                document.getElementById(this.brokenButtons[i]).disabled = true;
            }
            console.log(this.brokenButtons);
        }
        else if(this.difficulty == "Hard"){
            for(let i=0; i<5; i++){
                this.brokenButtons[i]=convertToButtonName(Math.floor(Math.random()*16));
                console.log(this.brokenButtons[i]);
                document.getElementById(this.brokenButtons[i]).style.backgroundColor = "black";
                document.getElementById(this.brokenButtons[i]).disabled = true;
            }
            console.log(this.brokenButtons);
        }

    },
    setGoal: function(){
        this.goal = Math.floor(Math.random()*20);
        let p = document.getElementById("goalPar");
        p.innerHTML ="Goal: " + this.goal;
        console.log("Random goal set to: " + this.goal);
    }
};

var calcString = "";

function pressEasy(){                   //Gets called when the easy button is pressed
    brokenCalculator.setEasy();
    brokenCalculator.setGoal();
    clearScreen();
    resetButtons();
    brokenCalculator.breakButtons();
    console.log("Calculator set to " + brokenCalculator.difficulty + "!");
    document.getElementById("easyBut").disabled = true;         //Makes the easy button unclickable
    document.getElementById("mediumBut").disabled = false;       //Makes the other buttons clickable
    document.getElementById("hardBut").disabled = false;
}

function pressMedium(){                 //Gets called when the medium button is pressed
    brokenCalculator.setMedium();
    brokenCalculator.setGoal();
    clearScreen();
    resetButtons();
    brokenCalculator.breakButtons();
    console.log("Calculator set to " + brokenCalculator.difficulty + "!");
    document.getElementById("mediumBut").disabled = true;       //Makes the medium button unclickable
    document.getElementById("easyBut").disabled = false;       //Makes the other buttons clickable
    document.getElementById("hardBut").disabled = false;
}

function pressHard(){                   //Gets called when the hard button is pressed
    brokenCalculator.setHard();
    brokenCalculator.setGoal();
    clearScreen();
    resetButtons();
    brokenCalculator.breakButtons();
    console.log("Calculator set to " + brokenCalculator.difficulty + "!");
    document.getElementById("hardBut").disabled = true;         //Makes the hard button unclickable
    document.getElementById("easyBut").disabled = false;       //Makes the other buttons clickable
    document.getElementById("mediumBut").disabled = false;
}

function convertToButtonName(j){            //Helps breakButton() in adding the correct value to brokenButtons[]
    if(j == 0){return "zero"}
    else if(j == 10){return "add"}
    else if(j == 11){return "substract"}
    else if(j == 12){return "multiply"}
    else if(j == 13){return "divide"}
    else if(j == 14){return "sin"}
    else if(j == 15){return "cos"}
    else{return j};
}

function addToCalcString(char){             //Adds pushed button's value to calcString, writes calcString to calculator's screen
    if(calcString[calcString.length-1] == "$"){             //If last character in string is '$', clears screen
        clearScreen();
        document.getElementById("screenPar").style.color = "black";
    }
    if(calcString.length < 9 || calcString == ""){
        calcString += char;
        document.getElementById("screenPar").innerHTML = calcString;
    }
}

function clearScreen(){
    calcString = "";
    document.getElementById("screenPar").innerHTML = "";
    document.getElementById("screenPar").style.color = "black";
}

function resetButtons(){
    for(let i=0; i<(brokenCalculator.buttons.length-6); i++){               //Set grey buttons to default
        document.getElementById(brokenCalculator.buttons[i]).style.backgroundColor = "#888";
        document.getElementById(brokenCalculator.buttons[i]).disabled = false;
    }
    for(let i=(brokenCalculator.buttons.length-6); i<(brokenCalculator.buttons.length-2); i++){      //Set dark grey buttons to default
        document.getElementById(brokenCalculator.buttons[i]).style.backgroundColor = "#444";
        document.getElementById(brokenCalculator.buttons[i]).disabled = false;
    }
    document.getElementById(brokenCalculator.buttons[16]).style.backgroundColor = "#F30";      //Set equal button to default
    document.getElementById(brokenCalculator.buttons[16]).disabled = false;

    document.getElementById(brokenCalculator.buttons[17]).style.backgroundColor = "#888";       //Set AC button to default
    document.getElementById(brokenCalculator.buttons[17]).disabled = false;
}

function calculateResult(){                                 //Evaluates and writes result to screen, then checks if result == goal
    try{                                                    //Checks for syntax errors
        if(calcString[calcString.length-1] == "+" || calcString[calcString.length-1] == "-" || calcString[calcString.length-1] == "*" || calcString[calcString.length-1] == "/"){
            throw "Syntax Error"
        }
    }
    catch(err){
        document.getElementById("screenPar").innerHTML = err;
        return 1;
    }
    console.log(calcString);
    var result = eval(calcString);
    document.getElementById("screenPar").innerHTML = result;
    calcString += "$";                                          //Adds '$' as an end of expression character to end of the string
    if(result === brokenCalculator.goal){                       //If result is correct, sets new goal, and breaks new buttons
        if(calcString.search("[\\+|\\-|\\*|\\/]") == -1){
            document.getElementById("screenPar").innerHTML = "Don't cheat";
            document.getElementById("screenPar").style.color = "red";
        }
        else{
            document.getElementById("screenPar").style.color = "green";
            brokenCalculator.setGoal();
            resetButtons();
            brokenCalculator.breakButtons();
        }
    }
    else if(brokenCalculator.goal !== ""){                                                  //If result is incorrect, screen turns red
        document.getElementById("screenPar").style.color = "red";
    }
    return result;
}

function calcSin(){
    try{                                                    //Checks for syntax errors
        if(calcString[calcString.length-1] == "+" || calcString[calcString.length-1] == "-" || calcString[calcString.length-1] == "*" || calcString[calcString.length-1] == "/"){
            throw "Syntax Error"
        }
    }
    catch(err){
        document.getElementById("screenPar").innerHTML = err;
        return 1;
    }
    if(calcString[calcString.length-1] == "$"){             //If last character in string is '$', clears screen
        clearScreen();
        document.getElementById("screenPar").style.color = "black";
    }
    else{
        var evalRes = eval(calcString);
        console.log(evalRes + typeof evalRes);
        var result = Math.round(Math.sin(evalRes));
        console.log(result + typeof result);
        console.log(result);
        calcString = result;
        document.getElementById("screenPar").innerHTML = result;
    }
}

function calcCos(){
    try{                                                    //Checks for syntax errors
        if(calcString[calcString.length-1] == "+" || calcString[calcString.length-1] == "-" || calcString[calcString.length-1] == "*" || calcString[calcString.length-1] == "/"){
            throw "Syntax Error"
        }
    }
    catch(err){
        document.getElementById("screenPar").innerHTML = err;
        return 1;
    }
    if(calcString[calcString.length-1] == "$"){             //If last character in string is '$', clears screen
        clearScreen();
        document.getElementById("screenPar").style.color = "black";
    }
    else{
        var evalRes = eval(calcString);
        console.log(evalRes + typeof evalRes);
        var result = Math.abs(Math.round(Math.cos(evalRes)));
        console.log(result + typeof result);
        console.log(result);
        calcString = result;
        document.getElementById("screenPar").innerHTML = result;
    }
}