/******************************************************

** Name: 

** Filename: WashingDrv.cpp

** Project #: Data Structures And Other Objects Using C++ 2nd Edition
              (Micheal Main & Walter Savich)
              <Implementing Car Wash Sim. Pg 390-396>

** Project Description: Develop a test driver that 
   implements the class Car Wash.

** Output: The simulation of cars passing through a car
   wash based on user inputed criteria of the operating
   parameters of the car washing machine.

** Input: Time the car wash takes in minutes:
          Time between car arrivals in minutes:
          Total time to run car wash in minutes:
   

** Algorithm: 1. Instruct user to input time operating
                 parameters for car wash sim.
              2. Create function to implement washing 
		 class and pass user operating parameters
		 into car wash function.
              3. Display results of car wash simulation

******************************************************/
// Include files
#include <iostream>  // Used For cin, cout
#include <conio.h>   // Used For getch();
#include <cstdlib>    
#include <queue>     
#include "washing.h" 
using namespace std;
using namespace main_savitch_8A;

// Global Type Declarations

// Function Prototypes
void instruct (void); 
void pause ();
bool toQuit();
void car_wash_simulate // Implements CarWash Using Queue and washing.h
(unsigned int wash_time, double arrival_prob, unsigned int total_time);

//Global Variables - should not be used without good reason.

int main ()
{
	 // Declaration section
	 
	 bool done = false;       // User Decides To Quit
	 int timeWash = 0;        // Time Wash Takes
	 int timeBetweenCars = 0; // Time Between Cars
	 int timeTotal = 0;       // Total Time To Run 
	 int secs = 60;           // Convert Minutes Into Seconds

	 // Executable section
	 instruct ();
	
	 while (!done) // While Not False Repeat
	 {
          cout << "Please enter the time the wash takes in minutes: ";
	   cin >> timeWash;
	   timeWash = timeWash * secs;
	  cout << "Please enter the time in minutes between car arrivals: ";
	   cin >> timeBetweenCars;
	   timeBetweenCars = timeBetweenCars * secs;
	  cout << "Please enter the total time in minutes you want to run "
	       << "the sim: ";
           cin >> timeTotal;
	   timeTotal = timeTotal * secs;

          car_wash_simulate(timeWash, 1.0/timeBetweenCars, timeTotal);

          done = toQuit(); // Calls toQuit() Function To Continue Or End Prog.
         }
	
	 pause ();
	 return 0;
}

void car_wash_simulate
(unsigned int wash_time, double arrival_prob, unsigned int total_time)
// Library facilities used: iostream, queue, washing.h
{
    queue<unsigned int> arrival_times; // Waiting customer’s time stamps
    unsigned int next;                 // A value taken from the queue
    bool_source arrival(arrival_prob);
    washer machine(wash_time);
    averager wait_times;
    unsigned int current_second;

    // Write the parameters to cout.
    cout << "Seconds to wash one car: " << wash_time << endl;
    cout << "Probability of customer arrival during a second: ";
    cout << arrival_prob << endl;
    cout << "Total simulation seconds: " << total_time << endl;      

    for (current_second = 1; current_second <= total_time; ++current_second)
    {   // Simulate the passage of one second of time.

        // Check whether a new customer has arrived.
        if (arrival.query( ))
            arrival_times.push(current_second);

        // Check whether we can start washing another car.
        if ((!machine.is_busy( ))  &&  (!arrival_times.empty( )))
        {
            next = arrival_times.front( ); 
            arrival_times.pop( );
            wait_times.next_number(current_second - next);
            machine.start_washing( );
        }

        // Tell the washer to simulate the passage of one second.
        machine.one_second( );
    }

    // Write the summary information about the simulation.
    cout << "Customers served: " << wait_times.how_many_numbers( ) << endl;
    if (wait_times.how_many_numbers( ) > 0)
        cout << "Average wait: " << wait_times.average( ) << " sec" << endl;
}

bool toQuit ()
{
    bool cont = true;     // While Will Repeat Unless cont = false
    bool toReturn = true; // Default Value Of True Unless Changed
    char response;        // Users Decision To Continue Or End Prog.
		
    while (cont)
      { 
      cout <<"\nWould you like to continue? (Y/N) ";
      cin  >> response;
      cout <<"\n";

      if ((response != 'Y') && (response != 'y')
	 && (response != 'N') && (response != 'n'))
	  {                  // Error Because Did Not Use Y or N
	    cout <<"Invalid entry. Try again" << endl;
	  }                   

      if (response == 'Y' || response == 'y')
      { cont = false;       // User Continues
        toReturn = false;
      }            
      else if (response == 'N' || response == 'n')
      { cont = false;       // Stop Function
        toReturn = true;
            
      }

    }//End While
   
    return toReturn; // Returns True Or False To End

} // End Quit

void instruct (void)
{
	  // Declaration section
          cout << "This program will simulate a car wash where wash_time is the "
	       << "number of seconds\nneeded to wash one car, arrival_prob is the "
	       << "probability of a customer arriving\nin any second, and total_time "
	       << "is the total number of seconds for the simulation."
	       << "----------------------------------------------------"
	       << "---------------------------"
	       << endl;

	  // Executable section
} // End Instruct

void pause ()
{
    // Declaration section

    // Executable section
    cout << "\nPress any key to continue...";
    getch();
    cout << "\r";
    cout << "                            ";
    cout << "\r";
} // End Pause

/*
Program Output

This program will simulate a car wash where wash_time is the number of seconds
needed to wash one car, arrival_prob is the probability of a customer arriving
in any second, and total_time is the total number of seconds for the simulation.
-------------------------------------------------------------------------------
Please enter the time the wash takes in minutes: 3
Please enter the time in minutes between car arrivals: 5
Please enter the total time in minutes you want to run the sim: 25
Seconds to wash one car: 180
Probability of customer arrival during a second: 0.00333333
Total simulation seconds: 1500
Customers served: 6
Average wait: 29 sec

Would you like to continue? (Y/N)

*/