Generate HTML Reports for Appium (C#) Tests

using NUnit.Framework;
using OpenQA.Selenium.Appium;
using OpenQA.Selenium.Appium.Android;
using System;
using AventStack.ExtentReports;
using AventStack.ExtentReports.Reporter;

namespace MyAppiumTests
{
   [TestFixture]
   public class ApiDemos
   {
       private AndroidDriver<AndroidElement>? driver;
       private ExtentTest? _test;
       private static ExtentReports? _extent;

       [OneTimeSetUp]
       public void OneTimeSetup()
       {
           // Directly create ExtentReports instance here:
           var sparkReporter = new ExtentSparkReporter("ExtentReport.html");

           sparkReporter.Config.DocumentTitle = "ApiDemos Report";
           sparkReporter.Config.ReportName = "My Test Execution";

           _extent = new ExtentReports();
           _extent.AttachReporter(sparkReporter);
       }

       [SetUp]
       public void Setup()
       {
           // Create a test entry in Extent for this individual test
           _test = _extent?.CreateTest(TestContext.CurrentContext.Test.Name);

           // Now do your Kobiton/Appium driver setup:
           var kobitonServerUrl = new Uri("https://api.kobiton.com/wd/hub");
           var capabilities = new AppiumOptions();

           // Kobiton Credentials
           capabilities.AddAdditionalCapability("kobiton:username", "johndoe9652");
           capabilities.AddAdditionalCapability("kobiton:accessKey", "19*****eb-392a-4836-a623-7c****93");

           // Basic Device Info
           capabilities.AddAdditionalCapability("platformName", "Android");
           capabilities.AddAdditionalCapability("deviceName", "Pixel 9 Pro");
           capabilities.AddAdditionalCapability("platformVersion", "14");
           capabilities.AddAdditionalCapability("kobiton:groupId", "12906");
           capabilities.AddAdditionalCapability("appium:app","kobiton-store:v708");
           capabilities.AddAdditionalCapability("appPackage", "io.appium.android.apis");
           capabilities.AddAdditionalCapability("appActivity", "io.appium.android.apis.ApiDemos");
           capabilities.AddAdditionalCapability("automationName", "uiautomator2");

           try
           {
               driver = new AndroidDriver<AndroidElement>(kobitonServerUrl, capabilities, TimeSpan.FromSeconds(120));
               driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(10);

               // Log in Extent
               _test?.Info("Driver initialized successfully.");
           }
           catch (Exception ex)
           {
               _test?.Fail($"Driver initialization failed: {ex.Message}");
               throw;
           }
       }

       [Test]
       public void TestViewNavigation()
       {
           try
           {
               _test?.Info("Tapping 'Views'...");
               var viewsOption = driver.FindElementByAccessibilityId("Views");
               viewsOption.Click();

               _test?.Info("Tapping 'Controls'...");
               var controlsOption = driver.FindElementByAccessibilityId("Controls");
               controlsOption.Click();

               _test?.Info("Tapping '1. Light Theme'...");
               var lightThemeOption = driver.FindElementByAccessibilityId("1. Light Theme");
               lightThemeOption.Click();

               _test?.Info("Entering text in the EditText field...");
               var editTextField = driver.FindElementById("io.appium.android.apis:id/edit");
               editTextField.SendKeys("Hello from Appium!");

               //  screenshot
               TakeScreenshot("AfterEnteringText");

               // Mark test as passed in Extent
               _test?.Pass("Successfully navigated & interacted with ApiDemos!");
           }
           catch (Exception e)
           {
               _test?.Fail($"Test failed: {e.Message}");
               TakeScreenshot("OnError");
               throw;
           }
       }

       [TearDown]
       public void Teardown()
       {
           driver?.Quit();
           driver?.Dispose();
       }

       [OneTimeTearDown]
       public void OneTimeTeardown()
       {
           // Flush Extent to write everything to HTML
           _extent?.Flush();
       }

       private void TakeScreenshot(string stepName)
       {
           try
           {
               var screenshot = driver?.GetScreenshot();
               var fileName = $"{stepName}_{DateTime.Now:yyyyMMdd_HHmmss}.png";
               screenshot?.SaveAsFile(fileName, OpenQA.Selenium.ScreenshotImageFormat.Png);


               // Attach screenshot to the report
               _test?.AddScreenCaptureFromPath(fileName, stepName);
           }
           catch (Exception ex)
           {
               _test?.Warning($"Could not capture screenshot: {ex.Message}");
           }
       }
   }
}