import java.applet.*;
import java.awt.*;
import java.util.*;

import Account;
import CheckingAccount;
import SavingsAccount;
import CDAccount;
import LoanAccount;
import Exceptions;
import BankControls;
import AccountControls;
import ErrorDialog;
import TransferDialog;
import NewAccountDialog;

public class Bank extends Applet {
    // Vector with the current accounts
    public BankAccounts accounts=new BankAccounts();

    AccountControls accountControls;
    BankControls bankControls;

    TextArea output;

    Frame parent;

    // dialog windows
    TransferDialog transferDlg;
    ErrorDialog errorDlg;
    NewAccountDialog newaccountDlg;

    boolean error=false, transfer=false, newacct=false;

    // Initialization method
    public void init () {

	setLayout(new BorderLayout(5,5));

	// create and shows the account controls
	accountControls= new AccountControls();
	add("North",accountControls);

	// create the output area
	output=new TextArea(5,30);
	add("Center",output);

	parent=new Frame(); // create empty frame to enclose dialogs
		    
	// create and shows the banking controls (add/delete account etc.)
	bankControls= new BankControls();
	add("South",bankControls);

	// show controls
	accountControls.show();
	bankControls.show();
    }

    // private, border drawing method
    public void paint(Graphics g) {
	Rectangle r=bounds();
	g.setColor(Color.darkGray);
	g.draw3DRect(r.x+2, r.y+2, r.width-4, r.height-4, true);

	super.paint(g);
    }

    // main event loop
    public boolean handleEvent(Event event) {
	if(event.id==Event.ACTION_EVENT) {
	   if(event.target==accountControls.submit)
	      { // a new operation has been requested for current account

		// release dialog windows (if active)
		if(error) { errorDlg.dispose();
			    error=false;
			  }
		if(transfer) { transferDlg.dispose();
			       transfer=false;
			     }
		if(newacct) { newaccountDlg.dispose();
			      newacct=false;
			    }

		if(accounts.isEmpty()) {
		    errorDlg= new ErrorDialog(parent, "No accounts have been defined");
		    errorDlg.show();
		    error=true;
		    return true;
		}
		else {
		    // perform requested operation (deposit/withdraw or transfer) 
		    // on the account
		    String item=new String(accountControls.accountOperation.getSelectedItem());
		    Account acct=null;
		    Double doubleNo=new Double(0.0);

		    if(item.equals(new String("Transfer"))) {
	                // transfer operation requested
			transferDlg= new TransferDialog(parent, accounts, output);
			transferDlg.show();
			transfer=true;
		    } // end of Transfer
		    else
		    if(item.equals(new String("Deposit"))) {
			// deposit operation requested
			try { 
			acct=accounts.getAccount(accountControls.accountChoice.getSelectedItem());
			} catch (Exception e) { Error("Account does not exist!"); }

			try { doubleNo=new Double(accountControls.ammount.getText());
			      acct.Deposit(doubleNo.doubleValue());
			} catch (Exception e) { Error("Invalid deposit request"); }

			return true;
		    } // end of Deposit
		    else
		    if(item.equals(new String("Withdraw"))) {
			// withdraw operation requested
			try {
			acct=accounts.getAccount(accountControls.accountChoice.getSelectedItem());
			} catch (Exception e) { Error("Account does not exist!"); }

			try { doubleNo=new Double(accountControls.ammount.getText());
			      acct.Withdraw(doubleNo.doubleValue());
			} catch (Exception e) { Error("Invalid witdraw request"); }

			return true;
		    } // end of Withdraw
		    else
		    if(item.equals(new String("Balance"))) {
			// balance operation requested
			try {
			acct=accounts.getAccount(accountControls.accountChoice.getSelectedItem());
			} catch (Exception e) { Error("Account does not exist!"); }

			acct.Output();

			return true;
		    } // end of Balance

		} // end of "else" statement (ie. there ARE defined accounts)

		return true;
	      } // end of submit request operation
	   else
	   if(event.target==bankControls.newAccount) {
	     // request for creation of a new account
	     newaccountDlg=new NewAccountDialog(parent, this, output);
	     newaccountDlg.show();
	     newacct=true;
	     return true;
	   }
	   else
	   if(event.target==bankControls.advanceOneDay) {
	     // request for day advance
	     accounts.AdvanceDate();
	     return true;
	   }
	   else
	   if(event.target==bankControls.advanceOneMonth) {
	     // request for month advance
	     for(int i=0;i<30;i++)
		accounts.AdvanceDate();
	     return true;
	   }
	} // end of event loop
	return false;
    }

    public void Error(String message) {
	output.appendText(message);
    }
}