package extractcommand.step02;

import extractcommand.step00.*;
import extractcommand.AtmCommand;

public class AtmSession {

    AccountService accountService;
    Logger logger;

    public AtmSession(AccountService accountService, Logger logger) {
        this.accountService = accountService;
        this.logger = logger;
    }

    // * Cut (Ctl-X) the line with "return foo(accountNumber)"
    // * delete entire method body
    // * define anonymous inner class
    // * return generic User, pass in logger
    // * implement doExecute() (Ctl-I)
    // * Paste (Ctl-V) the line with "return foo(accountNumber)"
    // * call execute()
    // * make parameter final (Alt-Enter)
    public User checkOwner(final int accountNumber) throws SessionException {
        return new AtmCommand<User>(logger) {
            protected User doExecute() throws AccountServiceException {
                return foo(accountNumber);
            }
        }.execute();
    }

    private User foo(int accountNumber) throws AccountServiceException {
        User result;
        Account account = accountService.findAccount(accountNumber);
        result = account.getOwner();
        return result;
    }

    public Money checkBalance(int accountNumber) throws SessionException {
        try {
            Account account = accountService.findAccount(accountNumber);
            Money balance = account.getBalance();
            return balance;
        }
        catch (AccountServiceException e) {
            logger.log(e);
            throw new SessionException(e);
        }
    }

    public Money deposit(int accountNumber, Money amount) throws SessionException {
        try {
            Account account = accountService.findAccount(accountNumber);
            account.deposit(amount);
            return account.getBalance();
        }
        catch (AccountServiceException e) {
            logger.log(e);
            throw new SessionException(e);
        }
    }

    public Money withdraw(int accountNumber, Money amount) throws SessionException {
        try {
            Account account = accountService.findAccount(accountNumber);
            verifyBalance(account, amount);
            account.withdraw(amount);
            return account.getBalance();
        }
        catch (AccountServiceException e) {
            logger.log(e);
            throw new SessionException(e);
        }
    }

    public void transfer(int fromAccountNumber, int toAccountNumber, Money amount) throws SessionException {
        try {
            Account fromAccount = accountService.findAccount(fromAccountNumber);
            Account toAccount = accountService.findAccount(toAccountNumber);
            verifyBalance(fromAccount, amount);
            fromAccount.withdraw(amount);
            toAccount.deposit(amount);
        }
        catch (AccountServiceException e) {
            logger.log(e);
            throw new SessionException(e);
        }
    }

    private void verifyBalance(Account account, Money amount) throws SessionException {
        Money balance = account.getBalance();
        if (balance.subtract(amount).isNegative()) {
            throw new SessionException("Insufficient funds");
        }
    }

}