package mains;

import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.WebClientOptions;
import com.gargoylesoftware.htmlunit.javascript.SilentJavaScriptErrorListener;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxDriverLogLevel;
import org.openqa.selenium.firefox.FirefoxOptions;
import org.openqa.selenium.htmlunit.HtmlUnitDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;

public class MutationTest {

    private WebDriver ffDriver;
    private WebDriver huDriver;

    private static final String TRIGGER_OBSERVER = "document.text=\"Text1\";\n" +
            "const targetNode = document.getElementById('code-tab');\n" +
            "const config = { attributes: true, childList: true, subtree: true };\n" +
            "window.count = 0;\n" +
            "document.count = 0;\n" +
            "const callback = function(mutationsList, observer) {\n" +
            "    console.log('derp');\n" +
            "    window.count++;\n" +
            "    document.count++;\n" +
            "};\n" +
            "const observer = new MutationObserver(callback);\n" +
            "observer.observe(targetNode, config);";

    @BeforeEach
    void initDrivers() {
        System.setProperty("webdriver.gecko.driver", "c:\\...\\geckodriver.exe");
        FirefoxOptions options = new FirefoxOptions();
        options.setLogLevel(FirefoxDriverLogLevel.FATAL);
        ffDriver = new FirefoxDriver(options);
        huDriver = new HtmlUnitDriver(BrowserVersion.FIREFOX, true) {
            @Override
            protected WebClient modifyWebClient(WebClient client) {
                final WebClient webClient = super.modifyWebClient(client);
                WebClientOptions options = webClient.getOptions();
                options.setCssEnabled(true);
                options.setThrowExceptionOnScriptError(false);
                webClient.setJavaScriptErrorListener(new SilentJavaScriptErrorListener());
                return webClient;
            }
        };
    }

    @AfterEach
    void closeDrivers(){
        ffDriver.close();
        huDriver.close();
    }

    @Test
    void givenJavascriptPage_whenModifyingElement_triggerMutationObserver(){
        Assertions.assertEquals(mutate(ffDriver),mutate(huDriver));
    }

    private Long mutate(WebDriver driver) {
        driver.get("https://github.com/HtmlUnit/htmlunit");
        JavascriptExecutor js = (JavascriptExecutor) driver;
        js.executeScript(TRIGGER_OBSERVER);
        WebDriverWait wait = new WebDriverWait(driver,10);
        By codeTab = By.cssSelector("#code-tab");
        wait.until(ExpectedConditions.elementToBeClickable(codeTab));
        driver.findElement(codeTab).click();
        return (Long) js.executeScript("return document.count") + (Long) js.executeScript("return window.count");
    }

}