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package netukar.piggybank.ejb.session;

import javax.ejb.Stateful;
import netukar.piggybank.ejb.entity.Account;
import netukar.piggybank.ejb.entity.Client;
import netukar.piggybank.ejb.exception.DepositException;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

/**
 *
 * @author radovan
 */
@Stateful
public class BankDeskBean implements BankDeskLocal {

    @PersistenceContext
    private EntityManager manager;
    
    private Client client;


    public void setClient(Client client) {
        this.client = client;
    }

    public double getBalance(Account account) {
        if (client == null) {
            throw new IllegalStateException("No client has been set");
        }
        return account.getBalance();
    }

    public void deposit(Account account, double amount) {
        if (client == null) {
            throw new IllegalStateException("No client has been set");
        }
        if (amount <= 0) {
            throw new DepositException("Cannot deposit less or equal zero.");
        }
        account.setBalance(account.getBalance() + amount);
        manager.merge(client);
    }

    public void withdraw(Account account, double amount) {
        if (client == null) {
            throw new IllegalStateException("No client has been set");
        }
        if (amount < 0) {
            throw new DepositException("Cannot withdraw less than zero.");
        }
        if (amount > account.getBalance()) {
            throw new DepositException("Cannot withdraw more than current leftover.");
        }
        account.setBalance(account.getBalance() - amount);
        manager.merge(client);
    }

}