#include <iostream.h>
#include <fstream.h>
#include "apvector.h"

const int MAX_BOXES = 100;

struct MailInfo
{
    int POBox;         
    int mailCount;              // # pieces of mail for this po box

    MailInfo()
	: POBox(0),             // default constructor
	  mailCount(0)
    {
	    
    }
    
    MailInfo(int box)           // construct with one piece of mail
	: POBox(box),
	  mailCount(1)
    {
	    
    }
};


class MailBoxes
{
  public:
    MailBoxes();    // initial capacity = MAX_BOXES, zero boxes stored

    void addMail(int poBox);              // add one piece for poBox
    void processMail(istream & input);   // process file of po boxes

    void printAll(ostream & output);
    
  private:
    
    int boxIndex(int box);          // helper function, returns index
    
    apvector<MailInfo> myBoxes;     // list of all poboxes and counts
    int                myBoxCount;  // # of itmes stored in myBoxes
};


MailBoxes::MailBoxes()
    : myBoxes(MAX_BOXES),
      myBoxCount(0)
// postcondition: capacity = MAX_BOXES, zero boxes stored    
{
    
}

int MailBoxes::boxIndex(int box)
{
    int k;
    for(k=0; k < myBoxCount; k++)
    {
	if (myBoxes[k].POBox == box)
	{
	    return k;
	}
    }
    return -1;
}

void MailBoxes::addMail(int poBox)
{
    int index = boxIndex(poBox);
    if (index != -1)
    {
	myBoxes[index].mailCount++;
    }
    else
    {
	myBoxes[myBoxCount] = MailInfo(poBox);
	myBoxCount++;
    }
}

void MailBoxes::processMail(istream & input)
{
    int box;
    while (input >> box)
    {
	addMail(box);
    }
}


void MailBoxes::printAll(ostream & output)
{
    int k;
    for(k=0; k < myBoxCount; k++)
    {
	output << "box = [" << myBoxes[k].POBox << "] count = "
	       << myBoxes[k].mailCount << endl;
    }
}

int main()
{
    MailBoxes boxes;

    boxes.addMail(123);
    boxes.addMail(456);
    boxes.addMail(123);

    boxes.printAll(cout);

    cout << "after file processing" << endl;

    ifstream input("mail.dat");
    boxes.processMail(input);
    boxes.printAll(cout);
}