// Copyright © 2017 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 CefSharp.Handler;

namespace CefSharp.Example.RequestEventHandler
{
 /// <summary>
 /// Example class that demos exposing some of the methods of <see cref="RequestHandler"/> as events.
 /// Inheriting from <see cref="RequestHandler"/> requres you only override the methods you are interested in.
 /// You can of course inherit from the interface <see cref="IRequestHandler"/> and implement all the methods
 /// yourself if that's required.
 /// Simply check out the interface method the event was named by (e.g <see cref="OnCertificateErrorEvent" /> corresponds to
 /// <see cref="IRequestHandler.OnCertificateError" />)
 /// inspired by:
 /// https://github.com/cefsharp/CefSharp/blob/fa41529853b2527eb0468a507ab6c5bd0768eb59/CefSharp.Example/RequestHandler.cs
 /// </summary>
 public class RequestEventHandler : RequestHandler
 {
 public event EventHandler<OnBeforeBrowseEventArgs> OnBeforeBrowseEvent;
 public event EventHandler<OnOpenUrlFromTabEventArgs> OnOpenUrlFromTabEvent;
 public event EventHandler<OnCertificateErrorEventArgs> OnCertificateErrorEvent;
 public event EventHandler<OnPluginCrashedEventArgs> OnPluginCrashedEvent;
 public event EventHandler<GetAuthCredentialsEventArgs> GetAuthCredentialsEvent;
 public event EventHandler<OnRenderProcessTerminatedEventArgs> OnRenderProcessTerminatedEvent;
 public event EventHandler<OnQuotaRequestEventArgs> OnQuotaRequestEvent;

 protected override bool OnBeforeBrowse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool userGesture, bool isRedirect)
 {
 var args = new OnBeforeBrowseEventArgs(chromiumWebBrowser, browser, frame, request, userGesture, isRedirect);

 OnBeforeBrowseEvent?.Invoke(this, args);

 return args.CancelNavigation;
 }

 protected override bool OnOpenUrlFromTab(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, string targetUrl, WindowOpenDisposition targetDisposition, bool userGesture)
 {
 var args = new OnOpenUrlFromTabEventArgs(chromiumWebBrowser, browser, frame, targetUrl, targetDisposition, userGesture);

 OnOpenUrlFromTabEvent?.Invoke(this, args);

 return args.CancelNavigation;
 }

 protected override bool OnCertificateError(IWebBrowser chromiumWebBrowser, IBrowser browser, CefErrorCode errorCode, string requestUrl, ISslInfo sslInfo, IRequestCallback callback)
 {
 var args = new OnCertificateErrorEventArgs(chromiumWebBrowser, browser, errorCode, requestUrl, sslInfo, callback);

 OnCertificateErrorEvent?.Invoke(this, args);

 EnsureCallbackDisposal(callback);
 return args.ContinueAsync;
 }

 protected override void OnPluginCrashed(IWebBrowser chromiumWebBrowser, IBrowser browser, string pluginPath)
 {
 var args = new OnPluginCrashedEventArgs(chromiumWebBrowser, browser, pluginPath);

 OnPluginCrashedEvent?.Invoke(this, args);
 }

 protected override bool GetAuthCredentials(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback)
 {
 var args = new GetAuthCredentialsEventArgs(chromiumWebBrowser, browser, originUrl, isProxy, host, port, realm, scheme, callback);

 GetAuthCredentialsEvent?.Invoke(this, args);

 EnsureCallbackDisposal(callback);
 return args.ContinueAsync;
 }

 protected override void OnRenderProcessTerminated(IWebBrowser chromiumWebBrowser, IBrowser browser, CefTerminationStatus status)
 {
 var args = new OnRenderProcessTerminatedEventArgs(chromiumWebBrowser, browser, status);

 OnRenderProcessTerminatedEvent?.Invoke(this, args);
 }

 protected override bool OnQuotaRequest(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, long newSize, IRequestCallback callback)
 {
 var args = new OnQuotaRequestEventArgs(chromiumWebBrowser, browser, originUrl, newSize, callback);
 OnQuotaRequestEvent?.Invoke(this, args);

 EnsureCallbackDisposal(callback);
 return args.ContinueAsync;
 }

 private static void EnsureCallbackDisposal(IRequestCallback callbackToDispose)
 {
 if (callbackToDispose != null && !callbackToDispose.IsDisposed)
 {
 callbackToDispose.Dispose();
 }
 }

 private static void EnsureCallbackDisposal(IAuthCallback callbackToDispose)
 {
 if (callbackToDispose != null && !callbackToDispose.IsDisposed)
 {
 callbackToDispose.Dispose();
 }
 }
 }
}