using System;
using System.Collections.Generic;
using System.Text;

namespace _303_fall_07_hw4
{
    class Program
    {
        // -------------------------------------------------------------------------------------------

        static void Main(string[] args)
        {
            // declare and initialize variables needed
            double total_receipts = 0.0;
            double hours_parked;
            double fee;

            // keep track of how many customers (not required, but nice)
            int customer_count = 1;

            do
            {
                // prompt the user
                Console.Write("How long did patron {0} park (enter 0 to quit) : ", customer_count);
                
                // read in hours parked
                hours_parked = Convert.ToDouble(Console.ReadLine());
                
                // invoke function to determine how much to charge
                fee = CalculateCharges(hours_parked);

                // if valid charge (and not quitting the program)
                if (fee != 0)
                {
                    // add charge to running total
                    total_receipts += fee;

                    // display results to user
                    Console.WriteLine("Cost for patron {0} is = {1:c}", customer_count, fee);
                    Console.WriteLine("Total receipts taken in is = {0:c}", total_receipts);

                    // increase count of customers
                    customer_count++;
                }
            } while (hours_parked != 0); // keep repeating until user selects quit
        }

        // -------------------------------------------------------------------------------------------

        private static double CalculateCharges(double hours_parked)
        {
            // round up for fractional hours (ensures 4.1 hours becomes 5, for example)
            hours_parked = Math.Ceiling(hours_parked);

            double cost;

            // verify the input is valid
            if ((hours_parked < 0) || (hours_parked > 24))
            {
                Console.WriteLine("Incorrect number; hours parked must be >= 0 and <= 24");
                cost = 0.0;
            }
            else if (hours_parked == 0)
                cost = 0.0;
            else if (hours_parked <= 3) // flat-rate for up to 3 hours
                cost = 2.0;
            else
                cost = (hours_parked - 3) * 0.5 + 2.0; // $2 + $0.50/hour after 3 hours

            // ensure that no charge exceeds 10
            //    b/c in the case where hours_parked > 19, cost would be too high unless this check is in place
            if (cost > 10.0)
                cost = 10;

            return cost;
        }

        // -------------------------------------------------------------------------------------------

    }
}