namespace OAuthClient
{
	using System;
	using System.Collections.Generic;
	using System.Configuration;
	using System.Linq;
	using System.Net;
	using System.Web;
	using System.Web.UI;
	using System.Web.UI.WebControls;
	using DotNetOpenAuth.ApplicationBlock;
	using DotNetOpenAuth.Messaging;
	using DotNetOpenAuth.OAuth2;

	public partial class WindowsLive : System.Web.UI.Page
	{
		private static readonly WindowsLiveClient windowsLiveClient = new WindowsLiveClient
		{
			ClientIdentifier = ConfigurationManager.AppSettings["windowsLiveAppID"],
			ClientCredentialApplicator = ClientCredentialApplicator.PostParameter(ConfigurationManager.AppSettings["WindowsLiveAppSecret"]),
		};

		protected void Page_Load(object sender, EventArgs e) {
			this.RegisterAsyncTask(
				new PageAsyncTask(
					async ct => {
						if (string.Equals("localhost", this.Request.Headers["Host"].Split(':')[0], StringComparison.OrdinalIgnoreCase)) {
							this.localhostDoesNotWorkPanel.Visible = true;
							var builder = new UriBuilder(this.publicLink.NavigateUrl);
							builder.Port = this.Request.Url.Port;
							this.publicLink.NavigateUrl = builder.Uri.AbsoluteUri;
							this.publicLink.Text = builder.Uri.AbsoluteUri;
						} else {
							IAuthorizationState authorization = await windowsLiveClient.ProcessUserAuthorizationAsync(new HttpRequestWrapper(Request), ct);
							if (authorization == null) {
								// Kick off authorization request
								var request = await windowsLiveClient.PrepareRequestUserAuthorizationAsync(
									scopes: new[] { WindowsLiveClient.Scopes.Basic }, // this scope isn't even required just to log in
									cancellationToken: ct);
								await request.SendAsync(new HttpContextWrapper(Context), ct);
								this.Context.Response.End();

								// alternatively you can ask for more information
								// windowsLiveClient.RequestUserAuthorization(scope: new[] { WindowsLiveClient.Scopes.SignIn, WindowsLiveClient.Scopes.Emails, WindowsLiveClient.Scopes.Birthday });
							} else {
								IOAuth2Graph oauth2Graph = await windowsLiveClient.GetGraphAsync(authorization, cancellationToken: ct);

								this.nameLabel.Text = HttpUtility.HtmlEncode(oauth2Graph.Name);
							}
						}
					}));
		}
	}
}