// multi.cpp     Dave Reed      9/3/02
//
// SIMPLE multiprogramming simulator.  A collection of jobs are read in from
// a file, and then executed using timesharing (TIME_SLICE set as a constant).
///////////////////////////////////////////////////////////////////////////////

#include <iostream>
#include <iomanip>
#include <string>
#include "JobQueue.h"
using namespace std;

const int TIME_SLICE = 100;				// time slice duration for time sharing
const int LOAD_DELAY = 5;				// setup time for a new job
const string JOB_FILE = "jobs.dat";		// file containing job data

int main()
{
	JobQueue CPUjobs(JOB_FILE);

    int time = 0, slice_count = TIME_SLICE;
	bool loadJob = true;

	while (CPUjobs.JobsRemaining()) {
		int current = CPUjobs.GetCurrentID();

		if (slice_count == TIME_SLICE) {
			if (loadJob) {
				cout << setw(4) << time << ": LOAD JOB " << current << endl;
				time += LOAD_DELAY;
				loadJob = false;
			}
			cout << setw(4) << time << ":   START JOB " << current << endl;
		}

		time++;
		slice_count--;
		JobStatus status = CPUjobs.ExecuteCurrentJob();
		
		if (status == DONE) {
			cout << setw(4) << time << ":     FINISH JOB " << current << endl;
			CPUjobs.RemoveCurrentJob();

			slice_count = TIME_SLICE;
			loadJob = true;
		}
		else if (slice_count == 0) {
			cout << setw(4) << time << ":     TIMEOUT JOB " << current << endl;
			CPUjobs.InterruptCurrentJob();
			
			slice_count = TIME_SLICE;
			loadJob = (current != CPUjobs.GetCurrentID());
		}
	}
	cout << "DONE PROCESSING" << endl;

	return 0;
}