Cash Register - FCC JS Project

cashRegister

function checkCashRegister(price, cash, cid) {
    let change = 0;
    let cashInDrawer = getSumOfCID(cid); // total in drawer
    let changeRequired = cash - price; // total to give back
    
    // Can I make change?
    if (changeRequired > cashInDrawer) {
        change = {status: "INSUFFICIENT_FUNDS", change: []};
    }   
    else if (changeRequired == cashInDrawer) {
        change = {status: "CLOSED", change: cid};
    }
    else {
        let changeMakeUp = getChangeMakeUp(changeRequired, cid);
        if(changeMakeUp == 0) {
            change = {status: "INSUFFICIENT_FUNDS", change: []};
        } else {
            change = {status: "OPEN", change: changeMakeUp};
        }
    } 
    //console.log(change);
    return change;
}

// How much money is in the drawer
function getSumOfCID(cid) {
    let sum = 0;
    cid.forEach((entry) => {
        sum += entry[1];
    });
    return sum.toFixed(2);
}

// What coins make up the change total to give
function getChangeMakeUp(changeRequired, cid) {

    let denominations = [
        ['ONE HUNDRED', 100],
        ['TWENTY', 20],
        ['TEN', 10],
        ['FIVE', 5],
        ['ONE', 1],
        ['QUARTER', 0.25],
        ['DIME', 0.10],
        ['NICKEL', 0.05],
        ['PENNY', 0.01]
    ];
       
    let cidReversed = cid.reverse();
    let changeMoney = [];
    let numberTaken = 0;   
    let i = 0;         
    
    cidReversed.forEach(function(cash) {
        let currentDenomination = denominations[i][0];
        let currentDenominationValue = denominations[i][1];
        let currentDenominationBalance = cash[1];

        if(changeRequired / currentDenominationValue > 1 && currentDenominationBalance > currentDenominationValue) {
            // Max number of times I can take from denomination based on CID 
            let maxNoCurrentDenom = currentDenominationBalance / currentDenominationValue;
            
            // How many of the denomination I need to make change
            let noCurrentDenom = parseInt(changeRequired / currentDenominationValue);
            
            // Don't take more than exists
            (noCurrentDenom > maxNoCurrentDenom) ? numberTaken = maxNoCurrentDenom : numberTaken = noCurrentDenom;
            
            // Calculate how much I have taken, what's left, how much more I need
            let currentDenomInHand = currentDenominationValue * numberTaken;
            changeRequired = (changeRequired - currentDenomInHand).toFixed(2);
            currentDenominationBalance -= currentDenomInHand;
            changeMoney.push([currentDenomination, currentDenomInHand]);
        }
            i++;
    });
        return changeMoney; 
}       

// TESTS
// checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])

checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])

// checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])

// checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])

// checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])