// PrimaryIndex.h
// CSI 2131 Asst 2a by Naim R. El-Far (naim@discover.uottawa.ca)
// CSI 2131 - Winter 2006 - Prof. L.M. Moura

// File:	PrimaryIndex.h
// Desc:	Header file for class PrimaryIndex which handles the primary index file

#pragma once

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

const int	INDEX_RECORD_SIZE = 11;

class PrimaryIndex {
public:
	fstream		indexFileStream;
	string		indexFileName;
	int			numberOfRecordsInIndex;
    
	PrimaryIndex();
	PrimaryIndex(string);
	~PrimaryIndex();

	long int GetFilePointerPosition(); //Function that returns the value of tellg. Used because in some instances tellg's overloaded functions were not defined with use with some operators
	void	ReadByRRN(long int, string&, long int&); //Given a RRN, read the record and store its student number and byte offset in the passed by-ref parameters
	void	WriteByRRN(long int, string, long int); //Given a RRN, a student number, and offset in the data file, write the student number and offset in the appropriate RRN 
	void	ShiftIndexRecords(long int); //Starting at a given point, shift all records to the right by one
	void	Insert(string, long int); //Insert at current file pointer location
	void	Addition(string, long int); //Insertion sort of a given line from the data file and its offset in the data file into the index
	long int BinarySearch(string); //Searches the whole index by calling Search(long, long, string)
};