#include<iostream>

#include<fstream>

#include<cstdlib>

#include<vector>

#include<map>

using namespace std;

#define MIN_BALANCE 500

class InsufficientFunds{};

class Account{

private:

long accountNumber;

string firstName;

string lastName;

float balance;

static long NextAccountNumber;

public:

Account(){}

Account(string fname,string lname,float balance);

long getAccNo(){return accountNumber;}

string getFirstName(){return firstName;}

string getLastName(){return lastName;}

float getBalance(){return balance;}

void Deposit(float amount);

void Withdraw(float amount);

static void setLastAccountNumber(long accountNumber);

static long getLastAccountNumber();

friend ofstream & operator<<(ofstream &ofs,Account &acc);

friend ifstream & operator>>(ifstream &ifs,Account &acc);

friend ostream & operator<<(ostream &os,Account &acc);

};

long Account::NextAccountNumber=0;

class Bank{

private:

map<long,Account> accounts;

public:

Bank();

Account OpenAccount(string fname,string lname,float balance);

Account BalanceEnquiry(long accountNumber);

Account Deposit(long accountNumber,float amount);

Account Withdraw(long accountNumber,float amount);

void CloseAccount(long accountNumber);

void ShowAllAccounts();

~Bank();

};

int main(){

Bank b;

Account acc;

int choice;

string fname,lname;

long accountNumber;

float balance;

float amount;

cout<<"***Banking System***"<<endl;

do{

cout<<"\n\tSelect one option below ";

cout<<"\n\t1 Open an Account";

cout<<"\n\t2 Balance Enquiry";

cout<<"\n\t3 Deposit";

cout<<"\n\t4 Withdrawal";

cout<<"\n\t5 Close an Account";

cout<<"\n\t6 Show All Accounts";

cout<<"\n\t7 Quit";

cout<<"\nEnter your choice: ";

cin>>choice;

switch(choice){

case 1:

cout<<"Enter First Name: ";

cin>>fname;

cout<<"Enter Last Name: ";

cin>>lname;

cout<<"Enter initil Balance: ";

cin>>balance;

acc=b.OpenAccount(fname,lname,balance);

cout<<endl<<"Congradulation Account is Created"<<endl;

cout<<acc;

break;

case 2:

cout<<"Enter Account Number:";

cin>>accountNumber;

acc=b.BalanceEnquiry(accountNumber);

cout<<endl<<"Your Account Details"<<endl;

cout<<acc;

break;

case 3:

cout<<"Enter Account Number:";

cin>>accountNumber;

cout<<"Enter Balance:";

cin>>amount;

acc=b.Deposit(accountNumber, amount);

cout<<endl<<"Amount is Deposited"<<endl;

cout<<acc;

break;

case 4:

cout<<"Enter Account Number:";

cin>>accountNumber;

cout<<"Enter Balance:";

cin>>amount;

acc=b.Withdraw(accountNumber, amount);

cout<<endl<<"Amount Withdrawn"<<endl;

cout<<acc;

break;

case 5:

cout<<"Enter Account Number:";

cin>>accountNumber;

b.CloseAccount(accountNumber);

cout<<endl<<"Account is Closed"<<endl;

cout<<acc;

case 6:

b.ShowAllAccounts();

break;

case 7:

break;

default:

cout<<"\nEnter corret choice";

exit(0);

}

}while(choice!=7);

return 0;

}

Account::Account(string fname,string lname,float balance){

NextAccountNumber++;

accountNumber=NextAccountNumber;

firstName=fname;

lastName=lname;

this->balance=balance;

}

void Account::Deposit(float amount){

balance+=amount;

}

void Account::Withdraw(float amount){

if(balance-amount<MIN_BALANCE)

throw InsufficientFunds();

balance-=amount;

}

void Account::setLastAccountNumber(long accountNumber){

NextAccountNumber=accountNumber;

}

long Account::getLastAccountNumber(){

return NextAccountNumber;

}

ofstream & operator<<(ofstream &ofs,Account &acc){

ofs<<acc.accountNumber<<endl;

ofs<<acc.firstName<<endl;

ofs<<acc.lastName<<endl;

ofs<<acc.balance<<endl;

return ofs;

}

ifstream & operator>>(ifstream &ifs,Account &acc){

ifs>>acc.accountNumber;

ifs>>acc.firstName;

ifs>>acc.lastName;

ifs>>acc.balance;

return ifs;

}

ostream & operator<<(ostream &os,Account &acc){

os<<"First Name:"<<acc.getFirstName()<<endl;

os<<"Last Name:"<<acc.getLastName()<<endl;

os<<"Account Number:"<<acc.getAccNo()<<endl;

os<<"Balance:"<<acc.getBalance()<<endl;

return os;

}

Bank::Bank(){

Account account;

ifstream infile;

infile.open("Bank.data");

if(!infile){

//cout<<"Error in Opening! File Not Found!!"<<endl;

return;

}

while(!infile.eof()){

infile>>account;

accounts.insert(pair<long,Account>(account.getAccNo(),account));

}

Account::setLastAccountNumber(account.getAccNo());

infile.close();

}

Account Bank::OpenAccount(string fname,string lname,float balance){

ofstream outfile;

Account account(fname,lname,balance);

accounts.insert(pair<long,Account>(account.getAccNo(),account));

outfile.open("Bank.data", ios::trunc);

map<long,Account>::iterator itr;

for(itr=accounts.begin();itr!=accounts.end();itr++){

outfile<<itr->second;

}

outfile.close();

return account;

}

Account Bank::BalanceEnquiry(long accountNumber){

map<long,Account>::iterator itr=accounts.find(accountNumber);

return itr->second;

}

Account Bank::Deposit(long accountNumber,float amount){

map<long,Account>::iterator itr=accounts.find(accountNumber);

itr->second.Deposit(amount);

return itr->second;

}

Account Bank::Withdraw(long accountNumber,float amount){

map<long,Account>::iterator itr=accounts.find(accountNumber);

itr->second.Withdraw(amount);

return itr->second;

}

void Bank::CloseAccount(long accountNumber){

map<long,Account>::iterator itr=accounts.find(accountNumber);

cout<<"Account Deleted"<<itr->second;

accounts.erase(accountNumber);

}

void Bank::ShowAllAccounts(){

map<long,Account>::iterator itr;

for(itr=accounts.begin();itr!=accounts.end();itr++){

cout<<"Account "<<itr->first<<endl<<itr->second<<endl;

}

}

Bank::~Bank(){

ofstream outfile;

outfile.open("Bank.data", ios::trunc);

map<long,Account>::iterator itr;

for(itr=accounts.begin();itr!=accounts.end();itr++){

outfile<<itr->second;

}

outfile.close();

}