/****************************************************************
File:	cashiercalculator.cpp			
Description: This program calculates the cost for each of the item, sales tax, and the total price before and after tax. All based on what the user inputs then it displays a sumamry
of the purchase and calculates the amount of change to be rendered to the customer. 		

Author: Ray Mansour			 
Class: Introduction to Computer Science I (c++) - 110-71			
Date: 10/6/2023			

I hereby certify that this program is entirely my own work.
*****************************************************************/

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
cout << "Ray's Awesome Store Cashier Program" << endl;

const int denominations[] = {100, 20, 10, 5, 1, 25, 10, 5, 1};
const string denominations_names[] = {"$100 bills", "$20 bills","$10 bills","$5 bills", "$1 bills", "quarters", "dimes", "nickels","pennies"};
const int num_denominations = 9;

string item_names[3];
double unit_price[3];
int quantity[3];
double total_cost_before_tax = 0.0;
double tax_rate;
double tax;
double total_cost_after_tax;
double payment_amount;
double change;

cout << "Enter details for item 1:" << endl;
cout << "Item name: ";
cin.ignore();
cin >> item_names[0];

cout << "Unit price ($): ";
cin >> unit_price[0];

cout << "Quantity ";
cin >> quantity[0];

double item_cost_1 = unit_price[0] * quantity[0];
total_cost_before_tax += item_cost_1;
cout << endl;

cout << "Enter details for item 2:" << endl;
cout << "Item name: ";
 cin.ignore();
cin >> item_names[1];

cout << "Unit price ($): ";
cin >> unit_price[1];

cout << "Quantity: ";
cin >> quantity[1];

	
double item_cost_2 = unit_price[1] * quantity[1];
total_cost_before_tax += item_cost_2;
cout << endl;


 cout << "Enter details for item 3:" << endl;
cout << "Item name: ";
 cin.ignore();
cin >> item_names[2];

cout << "Unit price ($): ";
 cin >> unit_price[2];

cout << "Quantity: ";
 cin >> quantity[2];

double item_cost_3 = unit_price[2] * quantity[2];
 total_cost_before_tax += item_cost_3;
 cout << endl;

    do
    {
        cout << "Enter the sales tax rate (%): ";
        cin >> tax_rate;

        if (tax_rate < 0 || tax_rate > 100)
        {
            cout << "Please enter a valid tax rate between 0 and 100." << endl;
        }
        else
        {
            break; // valid input
        }
    } while (true);

	tax = total_cost_before_tax * (tax_rate / 100);
    total_cost_after_tax = total_cost_before_tax + tax;

	cout << fixed << setprecision(2);
    cout << setw(20) << "Item Name" << setw(20) << "Unit Price ($)" << setw(10) << "Quantity" << setw(15) << "Cost ($) " << endl;
    cout << setw(20) << item_names[0] << setw(20) << unit_price[0] << setw(10) << quantity[0] << setw(15) << unit_price[0] * quantity[0] << endl;
    cout << setw(20) << item_names[1] << setw(20) << unit_price[1] << setw(10) << quantity[1] << setw(15) << unit_price[1] * quantity[1] << endl;
    cout << setw(20) << item_names[2] << setw(20) << unit_price[2] << setw(10) << quantity[2] << setw(15) << unit_price[2] * quantity[2] << endl;

	cout << setw(45) << "Total Cost Before Tax: $" << total_cost_before_tax << endl;
    cout << setw(45) << "Tax: $" << tax << endl;
    cout << setw(45) << "Total Cost After Tax: $" << total_cost_after_tax << endl;

	   do
    {
        cout << "Enter amount of payment from the customer ($): ";
        cin >> payment_amount;

        if (payment_amount < total_cost_after_tax)
        {
            cout << "Please enter an amount not less than the total cost." << endl;
        }
        else	
        {
            break; // valid input
        }
    } while (true);

	change = payment_amount - total_cost_after_tax;
    cout << "Amount of Change to be Rendered: $" << change << endl;

   cout << "Denominations for Change" << endl;

  for (int i = 0; i < num_denominations; i++)
    {
        int num_denomination = change / denominations[i];
        if (num_denomination > 0)
        {
            cout << setw(15) << denominations_names[i] << ": " << num_denomination << endl;
            change -= num_denomination * denominations[i];
        }
}
	
	return 0;
}