package mytest;

import static org.junit.Assert.*;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeDriverService;
import org.openqa.selenium.chrome.ChromeOptions;
import org.openqa.selenium.support.ui.ExpectedCondition;
import org.openqa.selenium.support.ui.WebDriverWait;

public class CalculatorTest {
	
	//The URL of the calculator to be opened in the browser
	private static String CalculatorUrl = "https://specflowoss.github.io/Calculator-Demo/Calculator.html";
	
	//The path of the WebDriver for Chrome
	private static String driverPath = "D:/Selenium/chromedriver_win32/chromedriver.exe";

	//The Selenium web driver to automate the browser
	private static ChromeDriver chromeDriver;

	//Test objects
	private WebElement firstNumberElement  	= chromeDriver.findElement(By.id("first-number"));
	private WebElement secondNumberElement 	= chromeDriver.findElement(By.id("second-number"));

	private WebElement addButtonElement 	= chromeDriver.findElement(By.id("add-button"));
//	by "Add" caption
//	private WebElement addButtonElement 	= chromeDriver.findElement(By.xpath("//button[@type='submit' and contains(., 'Add')]"));
	
	private WebElement resultElement 		= chromeDriver.findElement(By.id("result"));
	private WebElement resetButtonElement 	= chromeDriver.findElement(By.id("reset-button"));
	

	//The default wait time in seconds for wait.until()
	private int defaultWaitInSeconds = 5;


	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
		//Sets the ChromeDriver path
		System.setProperty("webdriver.chrome.driver", driverPath);
	
		//Creates the Selenium web driver
		ChromeDriverService chromeDriverService = ChromeDriverService.createDefaultService();
		ChromeOptions chromeOptions = new ChromeOptions();
		chromeDriver  = new ChromeDriver(chromeDriverService, chromeOptions);
		
		//Open the calculator page in the browser
		chromeDriver.navigate().to(CalculatorUrl);
	}

	@AfterClass
	public static void tearDownAfterClass() throws Exception {
		
		// Disposes the Selenium web driver (closing the browser) after the test class completed
		chromeDriver.quit();
	}

	@Before
	public void setUp() throws Exception {
		//Click the reset button
		resetButtonElement.click();
		
		//Wait until the result field is empty
		waitUntilEmpty(chromeDriver, resultElement);
	}

	@After
	public void tearDown() throws Exception {
	}

	// Helper method to wait for the given field to be not empty
	private void waitUntilNotEmpty(WebDriver driver, WebElement el) {
		WebDriverWait wait = new WebDriverWait(driver, defaultWaitInSeconds);

		wait.until(new ExpectedCondition<Boolean>() {
			public Boolean apply(WebDriver webDriver) {
				return el.getAttribute("value").length() != 0;
			}
		});
	}

	// Helper method to wait for the given field to be empty
	private void waitUntilEmpty(WebDriver driver, WebElement el) {
		WebDriverWait wait = new WebDriverWait(driver, defaultWaitInSeconds);

		wait.until(new ExpectedCondition<Boolean>() {
			public Boolean apply(WebDriver webDriver) {
				return el.getAttribute("value").length() == 0;
			}
		});
	}

	public void enterFirstNumber(int number) {
		//Clear text box
		firstNumberElement.clear();
		
		//Enter text
		firstNumberElement.sendKeys(Integer.toString(number));
		
		//Check if the text was entered
		assertEquals(Integer.toString(number), firstNumberElement.getAttribute("value"));
	}

	public void enterSecondNumber(int number) {
		//Clear text box
		secondNumberElement.clear();
		
		//Enter text
		secondNumberElement.sendKeys(Integer.toString(number));
		
		//Check if the text was entered
		assertEquals(Integer.toString(number), secondNumberElement.getAttribute("value"));
	}

	public void clickAdd() {
		//Click the add button
		addButtonElement.click();
		
		//wait for the result field not empty 
		waitUntilNotEmpty(chromeDriver, resultElement);
	}

	/**
	 * The general procedure
	 * @param firstNumber first addendum
	 * @param secondNumber second addendum
	 */
	public void sumTestProcedure(int firstNumber, int secondNumber) {
		//Enter the first addendum
		enterFirstNumber(firstNumber);

		//Enter the first addendum
		enterSecondNumber(secondNumber);
		
		//Click the add button
		clickAdd();
		
		//Check for the result
		assertEquals(Integer.toString(firstNumber + secondNumber), resultElement.getAttribute("value"));
	}

	/**
	 * This tests sums two negative numbers
	 */
	@Test
	public void testNegativeNumbers() {
		sumTestProcedure(-1, -1);
	}

	/**
	 * This tests sums two positive numbers
	 */
	@Test
	public void testPositiveNumbers() {
		sumTestProcedure(2, 2);
	}

	/**
	 * This tests sums one negative and one positive numbers
	 */
	@Test
	public void testPositiveNegativeNumbers() {
		sumTestProcedure(-2, 3);
	}
}