// Copyright © 2010-2014 The CefSharp Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

using System;
using System.Diagnostics;
using System.IO;
using CefSharp.OffScreen;

namespace CefSharp.MinimalExample.OffScreen
{
    public class Program
    {
        private static ChromiumWebBrowser browser;

        public static void Main(string[] args)
        {
            const string testUrl = "https://www.google.com/";

            Console.WriteLine("This example application will load {0}, take a screenshot, and save it to your desktop.", testUrl);
            Console.WriteLine("You may see Chromium debugging output, please wait...");
            Console.WriteLine();

            Cef.Initialize(new CefSettings());

            // Create the offscreen Chromium browser.
            browser = new ChromiumWebBrowser();

            // An event that is fired when the first page is finished loading.
            // This returns to us from another thread.
            browser.FrameLoadEnd += BrowserFrameLoadEnd;

            // Start loading the test URL in Chrome's thread.
            browser.Load(testUrl);

            // We have to wait for something, otherwise the process will exit too soon.
            Console.ReadKey();

            // Clean up Chromium objects.  You need to call this in your application otherwise
            // you will get a crash when closing.
            Cef.Shutdown();
        }

        private static void BrowserFrameLoadEnd(object sender, FrameLoadEndEventArgs e)
        {
            // Check to ensure it is the main frame which has finished loading
            // (rather than an iframe within the main frame).
            if (e.IsMainFrame)
            {
                // Remove the load event handler, because we only want one snapshot of the initial page.
                browser.FrameLoadEnd -= BrowserFrameLoadEnd;

                // Wait for the screenshot to be taken.
                var task = browser.ScreenshotAsync();
                task.Wait();

                // Make a file to save it to (e.g. C:\Users\jan\Desktop\CefSharp screenshot.png)
                var screenshotPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "CefSharp screenshot.png");

                Console.WriteLine();
                Console.WriteLine("Screenshot ready.  Saving to {0}", screenshotPath);

                // Save the Bitmap to the path.
                // The image type is auto-detected via the ".png" extension.
                task.Result.Save(screenshotPath);

                // We no longer need the Bitmap.
                // Dispose it to avoid keeping the memory alive.  Especially important in 32-bit applications.
                task.Result.Dispose();

                Console.WriteLine("Screenshot saved.  Launching your default image viewer...");

                // Tell Windows to launch the saved image.
                Process.Start(screenshotPath);

                Console.WriteLine("Image viewer launched.  Press any key to exit.");
            }
        }
    }
}
