/*
       *      Code modified from Weiss Textbook: http://users.cis.fiu.edu/~weiss/dsaa_c++/Code
       *      Version author: A. Kalyanaraman
       *      Date:  11/22/2011
       *      For use in Cpt S 223, School of EECS, WSU
       */
 
	 
	 
	 #ifndef QUADRATIC_PROBING_H_
        #define QUADRATIC_PROBING_H_

        //#include "vector.h"
        //#include "mystring.h"
        #include <vector>
        #include <string>
		#include "globalfunctions.h"


		using namespace std;

        // QuadraticProbing Hash table class
        //
        // CONSTRUCTION: an initialization for ITEM_NOT_FOUND
        //               and an approximate initial size or default of 101
        //
        // ******************PUBLIC OPERATIONS*********************
        // void insert( x )       --> Insert x
        // void remove( x )       --> Remove x
        // Hashable find( x )     --> Return item that matches x
        // void makeEmpty( )      --> Remove all items

        class HashTable_qp
        {
          public:
            explicit HashTable_qp( const string& notFound, int size = 101 );
            HashTable_qp( const HashTable_qp & rhs )
              : ITEM_NOT_FOUND( rhs.ITEM_NOT_FOUND ),
                array( rhs.array ), currentSize( rhs.currentSize ) { }

            const string & find( const string & x ) const;

            void makeEmpty( );
            void insert( const string & x );
            void remove( const string & x );

            const HashTable_qp & operator=( const HashTable_qp & rhs );

            enum EntryType { ACTIVE, EMPTY, DELETED };
          private:
            struct HashEntry
            {
                string element;
                EntryType info;

                HashEntry( const string & e = string( ), EntryType i = EMPTY )
                  : element( e ), info( i ) { }
            };
            
            vector<HashEntry> array;
            int currentSize;
            const string ITEM_NOT_FOUND;

            bool isActive( int currentPos ) const;
            int findPos( const string & x ) const;
            void rehash( );
        };


        //#include "QuadraticProbing.cpp"
        #endif