#include "NRU.h"
#include <time.h>

time_t seconds = time(0);

int NRU::findVirtualPageToEvict(TableEntry *pageTable)
{
	int pageToEvict;
	bool pageRef;
	int tracking;
	bool modified;

	while (pageRef==false){
		pageRef = pageTable[pages.at(0)].used;
		tracking = pageTable[pages.at(0)].timeLastUsed;
		if (tracking < pageTable[pages.at(0)+1].timeLastUsed){
			pages.push_back(pages.at(0));
			pages.erase(pages.begin());
		}
	}


	pageToEvict=pages.at(0);

	return pageToEvict;
}

void NRU::virtualPageEvicted(TableEntry *pageTable, int virtualPage)
{
	for (int i=0; i<pages.size(); i++){
			if (pages.at(i)==virtualPage){
				pages.erase(pages.begin()+i);
			}
	}
}

void NRU::virtualPageLoaded(TableEntry *pageTable, int virtualPage)
{
	pages.push_back(virtualPage);
}

void NRU::virtualPageAccessed(TableEntry *pageTable, int virtualPage, bool modified)
{
	pageTable[virtualPage].used=true;
	pageTable[virtualPage].timeLastUsed=seconds;
}