const Register = (products, cash, salesTax) => {
	this.products = {}, this.cash = cash, this.salesTax = salesTax;
		// parse comma separted price list
		// attach product name as key in this.products
			// value is an object with props
			// sku 		: number,
			// price	: number,
			// taxable: boolean
	this.transactionLog = {};
		// will contain objects of all previous transactions
		// key will be transactionId and value will be log of products
		/*
			ex:
			 163235835: {
				date: dateTime,
				items: [items]
				total: totalPrice
			}
		*/
};

Register.prototype.viewBalance = () => {
	// Returns total balance in register currently
	return this.cash;
};

Register.prototype.deductFromRegisterBalance = (cashToBeDeducted) => {
	// deduct cashToBeDeducted from this.cash
};

Register.prototype.addToRegisterBalance = (cashToBeAdded) => {
	// add cashToBeAdded to this.cash
};

Register.prototype.addTransaction = (transactionId, transactionLog) => {
		this.transactionLog[transactionId] = transactionLog;
		// Adds a new, completed transaction to the log
};


// For every transaction, instantiate a new instance of Transaction.
// When transaction is complete, add to Register
const Transaction = (productId) => {
	this.currentTransaction = [];
	this.transactionId = Number;
	this.transactionTime = Date.now();
	this.transactionTotal = 0;
	// push new items to currenTransaction
	// summing transactionTotal for each item added
		// to find item price, lookup itemName in this.products[<product>].price
}

Transaction.prototype.showCurrentItem = () => {
	// Get last item added to this.currentTransaction
	// Get current balance with this.transactionTotal
	// Print both values for customer to see
}

Transaction.prototype.finishTransaction = (cashSumFromCustomer) => {
	const calculateChange = (transactionTotal, cash) => {
		// Takes in 2 numbers, total $ of transaction, and cash received from customer
		// Deducts transactionTotal from cash
			// change is to be given with largest bills first,
			// and smalled # of change
		return change;
	}
	// Log total for customer to see
	console.log(calculateChange(this.transactionTotal, cashSumFromCustomer));
	return calculateChange(this.transactionTotal, cashSumFromCustomer);
}