package lab.util;

import static org.junit.Assert.*;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.Timeout;

public class CheckoutLineTest {

  @Rule
  public Timeout globalTimeout = new Timeout(500);
  
  @Test
  public void testCtor() {
    CheckoutLine c = new CheckoutLine();
    assertNotNull("queue should not be null", c.getQueue());
    assertTrue("queue should be empty", c.getQueue().isEmpty());
  }

  @Test
  public void testHasCustomers() {
    CheckoutLine c = new CheckoutLine();
    assertFalse("checkout line should have no customers", c.hasCustomers());
    c.addCustomer(new Customer(0, new Random()));
    assertTrue("checkout line should have a customer", c.hasCustomers());
  }

  @Test
  public void testGetNumberOfCustomers() {
    CheckoutLine c = new CheckoutLine();
    assertEquals("", 0, c.getNumberOfCustomers());
    c.addCustomer(new Customer(0, new Random()));
    assertEquals("checkout line should have 1 customer", 1, c.getNumberOfCustomers());
    c.addCustomer(new Customer(0, new Random()));
    assertEquals("checkout line should have 2 customer", 2, c.getNumberOfCustomers());
  }

  @Test
  public void testGetCurrentCustomer() {
    CheckoutLine c = new CheckoutLine();
    assertNull("current customer should be null", c.getCurrentCustomer());
    Customer cust = new Customer(0, new Random()); 
    c.addCustomer(cust);
    assertSame("wrong current customer", cust, c.getCurrentCustomer());
  }

  @Test
  public void testGetCustomersAsList() {
    List<Customer> t = new ArrayList<Customer>();
    
    CheckoutLine c = new CheckoutLine();
    assertEquals("list of customers should be empty", t, c.getCustomersAsList());
    
    Random r = new Random();
    t.add(new Customer(0, r));
    t.add(new Customer(1, r));
    t.add(new Customer(2, r));
    
    c.addCustomer(t.get(0));
    c.addCustomer(t.get(1));
    c.addCustomer(t.get(2));
    assertEquals("list contains the wrong number customers", t.size(), c.getCustomersAsList().size());
    assertSame("first customer in list is the wrong customer", t.get(0), c.getCustomersAsList().get(0));
    assertSame("second customer in list is the wrong customer", t.get(1), c.getCustomersAsList().get(1));
    assertSame("third customer in list is the wrong customer", t.get(2), c.getCustomersAsList().get(2));
  }

}