import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.Assert;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;


public class AutomationTesting {

  final private static String URL = "https://www.seleniumeasy.com/test/basic-first-form-demo.html";
  private static WebDriver driver = null;
  final private static String POPUP_CLOSE_BUTTON = "at-cv-lightbox-close";
  final private static String ENTER_MESSAGE_FIELD = "//input[@id='user-message']";
  final private static String SHOW_MESSAGE_BUTTON =
      "div.container-fluid.text-center:nth-child(2) " +
          "div.row div.col-md-6.text-left:nth-child(2) div.panel.panel-default:nth-child(4) " +
          "div.panel-body form:nth-child(3) > button.btn.btn-default";
  final private static String YOUR_MESSAGE_TEXT_LABEL = "//span[@id='display']";
  final private static String ENTERED_VALUE = "Hello World!";

  final private static String ENTER_A_FIELD = "sum1";
  final private static String ENTER_B_FIELD = "sum2";
  final private static String GET_TOTAL_BUTTON = "//button[contains(text(),'Get Total')]";
  final private static String NUM_VALUE_A = "2";
  final private static String NUM_VALUE_B = "3";
  final private static String STR_VALUE_A = "a";
  final private static String STR_VALUE_B = "b";
  final private static String NAN_VALUE = "NaN";

  private static boolean firstTimeFlag = true;

  @BeforeTest
  public static void init() {
        /*Preconditions*/
    if (firstTimeFlag) {
      System.setProperty("webdriver.chrome.driver", "C:\\webdriver\\chromedriver.exe");
      driver = new ChromeDriver();
      driver.get(URL);
      driver.manage().timeouts().implicitlyWait(3, TimeUnit.SECONDS);
      driver.findElement(By.id(POPUP_CLOSE_BUTTON)).click();
      firstTimeFlag = false;
    }
  }

  @Test
  public static void testShowMessage() {
    String actualYourMessageResult;
    String enteredMessage = ENTERED_VALUE;

    driver.findElement(By.xpath(ENTER_MESSAGE_FIELD)).sendKeys(enteredMessage);
    driver.findElement(By.cssSelector(SHOW_MESSAGE_BUTTON)).click();
    actualYourMessageResult = driver.findElement(By.xpath(YOUR_MESSAGE_TEXT_LABEL)).getText();

    Assert.assertEquals(actualYourMessageResult, enteredMessage);
  }

  @Test
  public static void testGetTotal() {

    int actualDisplayedValue;

    int expectedSumValue = Integer.valueOf(NUM_VALUE_A) + Integer.valueOf(NUM_VALUE_B);

    driver.findElement(By.id(ENTER_A_FIELD)).sendKeys(NUM_VALUE_A);
    driver.findElement(By.id(ENTER_B_FIELD)).sendKeys(NUM_VALUE_B);

    driver.findElement(By.xpath(GET_TOTAL_BUTTON)).click();
    actualDisplayedValue = Integer.valueOf(driver.findElement(By.id("displayvalue")).getText());

    Assert.assertEquals(actualDisplayedValue, expectedSumValue);

            /*Postconditions*/
    driver.findElement(By.id(ENTER_A_FIELD)).clear();
    driver.findElement(By.id(ENTER_B_FIELD)).clear();
  }

  @Test
  public static void testGetTotalNegative() {

    String expectedSumValue = NAN_VALUE;
    String actualDisplayedValue;

    driver.findElement(By.id(ENTER_A_FIELD)).sendKeys(STR_VALUE_A);
    driver.findElement(By.id(ENTER_B_FIELD)).sendKeys(STR_VALUE_B);

    driver.findElement(By.xpath(GET_TOTAL_BUTTON)).click();
    actualDisplayedValue = driver.findElement(By.id("displayvalue")).getText();

    Assert.assertEquals(actualDisplayedValue, expectedSumValue);
  }
}