/* BankApp.java */

import java.io.*;
import sortedlist.*;

/**
 *  A bank application.  Allows a user to create and manipulate 
 *  banking accounts, using an ATM that is shared by all banking applications.
 */
public class BankApp {

  public static void main( String[] args ) {

    greeting();
    usage();
    BankApp bankApp = new BankApp();

    String command = bankApp.readLine( "--> ");
    while( !command.equals( "quit" ) ) {
      try {
	if( command.equals( "open" ) ) {
	  bankApp.open();
	} else if( command.equals( "deposit" ) ) {
	  bankApp.doDeposit();
	} else if( command.equals( "withdraw" ) ) {
	  bankApp.doWithdraw();
	} else if( command.equals( "inquire" ) ) {
	  bankApp.doInquire();
	} else {
	  System.err.println( "Invalid command: " + command );
	  usage();
	}
      } catch( Exception e ) {
	System.err.println( e );
      }
      command = bankApp.readLine( "--> ");
    }
  }

  public BankApp() {
    // fields initialized where they are declared.
  }

  /** Prompts the user to create an account and creates one in the ATM.
   *  @exception IOException if there are problems reading user input.
   */
  private void open() throws IOException {

    String name = readLine( "Enter name: " );

    int newNum = ATM.openAccount( name );

    System.out.println( name + ", your new account number is: " + newNum );
    System.out.println( "Thanks for opening an account with us!" );
  }

 /** Prompts the user for an account number and tries to perform a 
   * deposit transaction on that account. 
   *  @exception IOException if there are problems reading user input.
   */
  private void doDeposit() throws IOException {
    // Get account number
    int acctNumber = readInt( "Enter account number: " );
    int amount = readInt( "Enter amount to deposit: " );

    ATM.deposit( acctNumber, amount );
    System.out.println( "New balance for #" + acctNumber + " is " +
			ATM.balanceInquiry( acctNumber ) );
  }


  /**
   *  Prompts the user for an account number and tries
   *          to perform a withdrawl transaction from that account
   *  @exception IOException if there are problems reading user input.
   */
  private void doWithdraw() throws IOException {
    // Get account number
    int acctNumber = readInt( "Enter account number: " );
    int amount = readInt( "Enter amount to withdraw: " );

    ATM.withdraw( acctNumber, amount );
    System.out.println( "New balance for #" + acctNumber + " is " +
			ATM.balanceInquiry( acctNumber ) );
  }


  /** Prompts the user for an account number and tries to get 
   *  that account's balance.
   *  @exception IOException if there are problems reading user input.
   */
  private void doInquire() throws IOException {
    int acctNumber = readInt( "Enter account number: " );

    System.out.println( "Balance for #" + acctNumber + " is " +
			ATM.balanceInquiry( acctNumber ) );
  }

  /** Displays a greeting message on the screen.
   */
  private static void greeting() {
    System.out.println( "-------------------" );
    System.out.println( "Welcome to the bank" );
    System.out.println( "-------------------" );
    System.out.println( "" );
  }


  /** Displays instructions on using the command line arguments.
   */
  private static void usage() {
    System.out.println( "Valid commands are: " +
			"open, deposit, withdraw, inquire, quit" );
  }

  /** Prints the given string and return a string from the input stream.
   *  @param prompt is the string printed to prompt the user.
   */
  private String readLine( String prompt ) throws IOException {
    System.out.print( prompt );
    System.out.flush();
    return bReader.readLine();
  }

  /** Return an integer from the input stream after prompting the user.
   *  @param prompt is the string printed to prompt the user.
   *  @return an int read from the users
   */
  private int readInt( String prompt ) throws IOException {
    String text = readLine( prompt );
    return Integer.valueOf(text).intValue();
  }

  private BufferedReader bReader = 
    new BufferedReader(new InputStreamReader ( System.in ));

  private VirtualTeller ATM = new VirtualTeller();
}