//account11.cc based on notes from tutorial Peter
#include<iostream.h>
#include<fstream.h>
#include<string>

const int ACC_MAX = 10;
enum TransactionType {Deposit, Withdraw};

struct Account                        //grouping account number and balance under Account{
  int accno;
  double balance;
};
struct Transaction                     //grouping transaction type, account number and amount of money moved{
  TransactionType type;
  int accno;
  double amount;
};

void process(Transaction t, Account& a)       //if deposit add money, if withdraw take out money{
  switch(t.type)
    {
    case Deposit:
      a.balance += t.amount;
      break;
    case Withdraw:
      a.balance -= t.amount;
      break;
    }
}

void main()
{
  Account accs[ACC_MAX];
  int nRead = 0;

  //open the data file
  ifstream accfile;
  accfile.open("accounts.dat");


  string na;                                    //number of accounts
  accfile >> accs[1].accno;
  getline (accfile, ucty);
  atoi(na);  
  cout <<"Reading from first line = " << na << endl;

  do                             //this does counting of accounts but I want to replace with stuff above
    {                                             //where reading from first line says how many accounts are there
    accfile >> accs[nRead].accno >> accs[nRead].balance;
    if(accfile)
      {
	nRead++;
      }
  } while (accfile && nRead < ACC_MAX);
 cout << nRead <<" accounts read\n";

 Transaction trans = {Withdraw, 123, 50.0};          //simple transaction WITHDRAW from account 123
  int a=0;
  for (int i =0; i < nRead; i++)
    {
      if (accs[i].accno == trans.accno)
        {
 	 process (trans, accs[i]);
 	 a = i;
        }
    }


  //check the balance               //print out up-date of account
  cout <<"Account number: " <<accs[a].accno << endl;
  cout <<"Balance is: £" << accs[a].balance << endl;
  accfile.close();

  ofstream oaccfile;                     //save any changes made
  oaccfile.open("accounts.dat");
  for (int i = 0; i < nRead; i++)
    {
      oaccfile << accs[i].accno << " " << accs[i].balance << endl;
    }
   
  oaccfile.close();
}