/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2015 Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Web;
using System.Collections.Specialized;
using GreenshotPlugin.Core;
using log4net;

namespace GreenshotPlugin.Controls {
	/// <summary>
	/// The OAuthLoginForm is used to allow the user to authorize Greenshot with an "Oauth" application
	/// </summary>
	public partial class OAuthLoginForm : Form {
		private static readonly ILog LOG = LogManager.GetLogger(typeof(OAuthLoginForm));
		private string _callbackUrl = null;
		private IDictionary<string, string> _callbackParameters = null;
		
		public IDictionary<string, string> CallbackParameters {
			get {
				return _callbackParameters;
			}
		}
		
		public bool IsOk {
			get {
				return DialogResult == DialogResult.OK;
			}
		}
		
		public OAuthLoginForm(string browserTitle, Size size, string authorizationLink, string callbackUrl) {
			_callbackUrl = callbackUrl;
			InitializeComponent();
			ClientSize = size;
			Icon = GreenshotResources.getGreenshotIcon();
			Text = browserTitle;
			_addressTextBox.Text = authorizationLink;

			// The script errors are suppressed by using the ExtendedWebBrowser
			_browser.ScriptErrorsSuppressed = false;
			_browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(Browser_DocumentCompleted);
			_browser.Navigate(new Uri(authorizationLink));
		}

		/// <summary>
		/// Make sure the form is visible
		/// </summary>
		/// <param name="e">EventArgs</param>
		protected override void OnShown(EventArgs e) {
			base.OnShown(e);
			WindowDetails.ToForeground(Handle);
		}

		private void Browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) {
			LOG.DebugFormat("document completed with url: {0}", _browser.Url);
			CheckUrl();
		}

		private void CheckUrl() {
			if (_browser.Url.ToString().StartsWith(_callbackUrl)) {
				string queryParams = _browser.Url.Query;
				if (queryParams.Length > 0) {
					queryParams = NetworkHelper.UrlDecode(queryParams);
					//Store the Token and Token Secret
					_callbackParameters = NetworkHelper.ParseQueryString(queryParams);
				}
				DialogResult = DialogResult.OK;
			}
		}

		private void AddressTextBox_KeyPress(object sender, KeyPressEventArgs e) {
			//Cancel the key press so the user can't enter a new url
			e.Handled = true; 
		}
	}
}