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//Chan Tak Sang
//50929220

#include 
#include 
#include 
#include 
using namespace std;

class bankaccount
{
	friend int loginchecking(string, string y, bankaccount z[10]);		
	//friend function prototype(account number, password, and list of account number)
	
	friend void balancechecking(int, bankaccount z[10]);
	//friend function prototype(integer for call by reference where the balance should be checked, list of account number)

	friend void withdraw(int, bankaccount z[10]);
	//friend function prototype(integer for call by reference where the withdraw is done, list of account number)
	
	friend void passwordreset(int, bankaccount z[10]);
	//friend function prototype(integer for call by reference where the pw should be reset, list of account number)
	
	friend void deposit(int, bankaccount z[10]);
	//friend function prototype(integer for call by reference where the deposit should be done, list of account number)
	
	friend void transfer(int, bankaccount z[10]);
	//friend function prototype(integer for call by reference , list of account number)

private:
	string accountnumber;
	string password;
	double balance;

public:
	bankaccount();
	//default constructor

};


void accountnogen(string &str);
//function prototype, same as AccNumGen function but the function has been modified




bankaccount::bankaccount()
//default constructor 
{
	string x;
	balance = 0;
	password = "000000";
	//by default every account number should have pw "000000" and $0 of balance
	accountnogen(x);
	accountnumber = x;
	//number of account depends on how the main function gives arugment 
}



int loginchecking(string x, string y, bankaccount z[10]) 
{
	for (int i=0; i<10; i++) 
	{
		if ((z[i].accountnumber == x) && (z[i].password == y))
			return i;
		//doing a for loop scanning, x and y are string variable for call by reference what account number the user has input
		//return a value same as the use of bool(true)
	}
	
	return 999;
	//same as bool (false), but only use int instead
}



void accountnogen(string& str) 
{
	static int seed = 1200;
	char buffer[10];
	string str1 = "300-475-";
	string str2(itoa(seed++, buffer, 10));
	str = str1 + str2;
}	//given function AccNumGen function definition, but function name has been modified



void balancechecking(int record, bankaccount z[10]) 
{
		cout << "Balance:$" << z[record].balance;
		//z[record]is to find out what account number balance is checking
}	//function definition of balancechecking

void withdraw(int record, bankaccount z[10]) 
{
	double wd;
	cout << "Withdraw:";
	cin >> wd;
	if (wd > z[record].balance) 
	{
		cout << "Insufficient fund";
		//if user type an amount(wd) > his own account balance, result in this
	}
	else 
	{
		z[record].balance -= wd;
		cout << "$" << wd << " has been withdrawn from your account";
		//balance has been modified because amount of withdraw(wd) is less or equal to the user's balance
	}
}

void passwordreset(int record, bankaccount z[10]) 
{
	string oldpass, newpass;
	cout << "Old password:";
	cin >> oldpass;
	cout << "New password:";
	cin >> newpass;
	if (z[record].password == oldpass) 
	{	// checks input oldpass against original password set for account
		z[record].password = newpass;
		cout << "Your password has been reset";
	}
	else {
		cout << "Invalid account number or password";
		//old password is not user's default password
	}	
}

void deposit(int record, bankaccount z[10])
{
	double dp;
	cout <<"Deposit:";
	cin >> dp;
	z[record].balance += dp;
	//user's account balance will be modified
	cout << "$" << z[record].balance << " has been deposited into your account";
}

void transfer(int record, bankaccount z[10])
{
	string transfertarget;
	double transferamount = 0;
	int transfer;
	bool check;

	cout << "Transfer to:";
	cin >> transfertarget;
	cout << "Amount:";	
	cin >> transferamount;

	if (z[record].balance < transferamount) 
	{ 
		cout << "Insufficient fund"; 
		void close();
	}			// checks for sufficient fund
	
	else 
		if (transfertarget == z[record].accountnumber) 
		{ 
			cout << "You cannot transfer to your own account"; 
			void close();
		} 
				//checks if transfers to customer's own account
	
		else 
	{
		for (int i=0; i<10; i++) 
		{
			if (z[i].accountnumber == transfertarget) 
			{							
				transfer = i;
				z[record].balance -= transferamount;
				//customer's balance will be changed

				z[transfer].balance += transferamount;
				//target's balance will be changed
				
				check = 1;
			}	// checks for target account location in constructor
		}
		if (check) 
		{ 
			cout << "$" << transferamount << " has been transferred to account " << transfertarget;
		} 
		else 
		{ 
			cout << "Invalid account number"; void close(); 
			//if user types  an invalid account number, result in this
		}

		

	}

}

int main() 
{
	bankaccount customer[10];
	//a bankaccount data type array with 10 account number inside
	
	string accno;
	string pw;
	int record;
	//use for check the return value of function "loginchecking" is 999 or not, same as bool
	
	char optiontype;
	//what option the user will type

	while (true)
		//this while loop is dummy until the user type "q' in option
		//and "-" in account number, program will terminate
	{
		cout << "Enter account number:";
		cin >> accno;
		if (accno == "-") 
		{ 
			break; 
		}
		cout << "Enter password:";
		cin >> pw;
	
		record = loginchecking(accno, pw, customer);
		if (record != 999) 
			//record should be equal to the return value of function "loginchecking"
		{
			cout << "Welcome " << accno;
			cout << "\nOption:";
			cin >> optiontype;

			while (optiontype != 'q') 
			{
				switch (optiontype) 
				{
					case 'c' : balancechecking(record, customer); break;
					case 'r' : passwordreset(record, customer); break;
					case 'w' : withdraw(record, customer); break;
					case 'd' : deposit(record, customer); break;
					case 't' : transfer(record, customer); break;
				}
				//using switch to determine what function the program should use after user types in a option
				//repeating the looping until user type in q, go back to the first while looping
				cout << "\nOption:";
				cin >> optiontype;
				
			}		
		}
		else 
		{ 
			cout << "Invalid account number or password" << endl; 
		}
	}
	return 0;
}