namespace OAuthClient {
	using System;
	using System.Configuration;
	using System.Linq;
	using System.Text;
	using System.Web;
	using System.Web.UI;
	using System.Web.UI.WebControls;
	using System.Xml.Linq;
	using DotNetOpenAuth.ApplicationBlock;
	using DotNetOpenAuth.OAuth;

	/// <summary>
	/// A page to demonstrate downloading a Gmail address book using OAuth.
	/// </summary>
	public partial class GoogleAddressBook : System.Web.UI.Page {
		private string AccessToken {
			get { return (string)Session["GoogleAccessToken"]; }
			set { Session["GoogleAccessToken"] = value; }
		}

		private InMemoryTokenManager TokenManager {
			get {
				var tokenManager = (InMemoryTokenManager)Application["GoogleTokenManager"];
				if (tokenManager == null) {
					string consumerKey = ConfigurationManager.AppSettings["googleConsumerKey"];
					string consumerSecret = ConfigurationManager.AppSettings["googleConsumerSecret"];
					if (!string.IsNullOrEmpty(consumerKey)) {
						tokenManager = new InMemoryTokenManager(consumerKey, consumerSecret);
						Application["GoogleTokenManager"] = tokenManager;
					}
				}

				return tokenManager;
			}
		}

		protected void Page_Load(object sender, EventArgs e) {
			if (this.TokenManager != null) {
				this.MultiView1.ActiveViewIndex = 1;

				if (!IsPostBack) {
					var google = new WebConsumer(GoogleConsumer.ServiceDescription, this.TokenManager);

					// Is Google calling back with authorization?
					var accessTokenResponse = google.ProcessUserAuthorization();
					if (accessTokenResponse != null) {
						this.AccessToken = accessTokenResponse.AccessToken;
					} else if (this.AccessToken == null) {
						// If we don't yet have access, immediately request it.
						GoogleConsumer.RequestAuthorization(google, GoogleConsumer.Applications.Contacts);
					}
				}
			}
		}

		protected void getAddressBookButton_Click(object sender, EventArgs e) {
			var google = new WebConsumer(GoogleConsumer.ServiceDescription, this.TokenManager);

			XDocument contactsDocument = GoogleConsumer.GetContacts(google, this.AccessToken, 5, 1);
			var contacts = from entry in contactsDocument.Root.Elements(XName.Get("entry", "http://www.w3.org/2005/Atom"))
						   select new { Name = entry.Element(XName.Get("title", "http://www.w3.org/2005/Atom")).Value, Email = entry.Element(XName.Get("email", "http://schemas.google.com/g/2005")).Attribute("address").Value };
			StringBuilder tableBuilder = new StringBuilder();
			tableBuilder.Append("<table><tr><td>Name</td><td>Email</td></tr>");
			foreach (var contact in contacts) {
				tableBuilder.AppendFormat(
					"<tr><td>{0}</td><td>{1}</td></tr>",
					HttpUtility.HtmlEncode(contact.Name),
					HttpUtility.HtmlEncode(contact.Email));
			}
			tableBuilder.Append("</table>");
			this.resultsPlaceholder.Controls.Add(new Literal { Text = tableBuilder.ToString() });
		}
	}
}