// File: prg8_1.cpp
// the program outputs the interview schedule for a personnel director.
// the executive secretary constructs a queue of appointment times
// by reading the times from the keyboard. by cycling through the
// queue, the secretary outputs the time at which each appointment
// begins and the available time until the next scheduled
// appointment. the last interview ends at 5:00 PM
 
#include <iostream>
#include <iomanip>
#include <queue>

#include "time24.h"

using namespace std;

int main()
{
   const Time24 LAST_APPT(17,0);  // interview end at 5:00pm
   Time24 interviewTime;

   // queue to hold appointment time for job applicants
   queue<Time24> apptQ;

   cout << "First interview of the day: ";
   cin >> interviewTime;

   // construct the queue until input is 5:00 PM or later
   while (interviewTime < LAST_APPT)
   {
      //  push the interview time on the queue
      apptQ.push(interviewTime);

      // prompt for the next interview time
      cout << "Next interview: ";
      cin >> interviewTime;
   }

   // output the day's appointment schedlule
   cout << endl << "Appointment    Available Interview Time" << endl;

   // pop the next applicant appointment time and determine available
   // time for interview by checking time for applicant at the front
   // of the queue
   while (!apptQ.empty())
   {
      interviewTime = apptQ.front();
      apptQ.pop();

      // output available time. if the queue is empty,
      // the interview ends at 5:00 PM
      cout << "  " << interviewTime << setw(17) << "  "; 
      if (apptQ.empty())
         cout << (LAST_APPT - interviewTime) << endl;
      else
         cout << (apptQ.front()-interviewTime) << endl;
   }

   return 0;
}