//generate.cpp -- generate a password.

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <ctime>

using namespace std;

class password
{
	private:
		char *pass; //pointer to password
		int length; //length of password
		static char letters[52]; //array of alphabet to gen. password
		static int count;
	public:
		password(int); //constructor
		password(const password &); //copy constructor
		password &operator=(const password &); //assignment operator
		~password();//deconstructor
		void generate(); //generate the password
		friend void set(); //initialize the static array to correct value
		friend ostream &operator<<(ostream &, password &); //overload the "<<" operator
		friend void countPasses();
		
};

char password::letters[52];

int password::count = 0;

void set()
{
	char alpha = 'a';

	for(int x=0;x<26;x++,alpha++)
		password::letters[x] = alpha ;

	alpha = 'A';
	for(int x=26;x<52;x++,alpha++)
		password::letters[x] = alpha;
}//assign a, b, c, d, e, etc
 
password::password(int x) //x = user set password length
{
	pass = new char[x]; // set pointer to newly set array 
	length = x; //set password::length to x;
	++count;
}

password::password(const password &passwd)
{
	++count; //increase count by 1
	
	pass = new char[passwd.length]; //allot new space, and set pointer
	strcpy(pass, passwd.pass); //copy strings
	length = passwd.length; //copy lengths
}

void password::generate()
{
	int val1, val2, point, temp1;
	char temp2;

	for(int i=0;i<length;i++) //repeat for the length of the password
	{
		
		val1 = rand() % 26; //generate two random values
		val2 = rand() % 26; //from 1 - 26
		point = val1 + val2; //add them to get final random value

		*(pass + i) = password::letters[point]; //assign random letter to appropriate password
	}

	*(pass + length) = '\0';
}

ostream &operator<<(ostream &os, password &passwd)
{
	os << passwd.pass; //overload cout 

	return os;
}

password::~password()
{
	delete [] pass; //delete value pointed to by pointer
	--count;
}

void countPasses()
{
	cout << password::count << endl;
}

password &password::operator=(const password &pass2)
{
	if(this == &pass2) //if assigned to eachother
		return *this;

	delete [] pass; //free old password
	length = pass2.length;
	pass = new char[length];
	strcpy(pass, pass2.pass);

	return *this;
}

//short main() to demonstrate class
int main()
{
	srand(time(0)); //seed randomizer
        set(); //set static letters
	int numberof;
	cout << "Enter the number of letters in new password: ";
	cin  >> numberof;
	password pass1(numberof);
	pass1.generate();

	cout << "\n\nPassword: " << pass1 << endl;

	return 0;
}