/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2016 Thomas Braun, Jens Klingen, Robin Krom, Francis Noel
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/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.Drawing;
using System.Xml;
using Greenshot.IniFile;
using Greenshot.Plugin;
using GreenshotPlugin.Core;
using log4net;

namespace GreenshotFlickrPlugin {
	/// <summary>
	/// Description of FlickrUtils.
	/// </summary>
	public class FlickrUtils {
		private static readonly ILog LOG = LogManager.GetLogger(typeof(FlickrUtils));
		private static readonly FlickrConfiguration config = IniConfig.GetIniSection<FlickrConfiguration>();
		private const string FLICKR_API_BASE_URL = "https://api.flickr.com/services/";
		private const string FLICKR_UPLOAD_URL = FLICKR_API_BASE_URL + "upload/";
		// OAUTH
		private const string FLICKR_OAUTH_BASE_URL = FLICKR_API_BASE_URL + "oauth/";
		private const string FLICKR_ACCESS_TOKEN_URL = FLICKR_OAUTH_BASE_URL + "access_token";
		private const string FLICKR_AUTHORIZE_URL = FLICKR_OAUTH_BASE_URL + "authorize";
		private const string FLICKR_REQUEST_TOKEN_URL = FLICKR_OAUTH_BASE_URL + "request_token";
		private const string FLICKR_FARM_URL = "https://farm{0}.staticflickr.com/{1}/{2}_{3}_o.{4}";
		// REST
		private const string FLICKR_REST_URL = FLICKR_API_BASE_URL + "rest/";
		private const string FLICKR_GET_INFO_URL = FLICKR_REST_URL + "?method=flickr.photos.getInfo";

		/// <summary>
		/// Do the actual upload to Flickr
		/// For more details on the available parameters, see: http://flickrnet.codeplex.com
		/// </summary>
		/// <param name="surfaceToUpload"></param>
		/// <param name="outputSettings"></param>
		/// <param name="title"></param>
		/// <param name="filename"></param>
		/// <returns>url to image</returns>
		public static string UploadToFlickr(ISurface surfaceToUpload, SurfaceOutputSettings outputSettings, string title, string filename) {
			var oAuth = new OAuthSession(FlickrCredentials.ConsumerKey, FlickrCredentials.ConsumerSecret)
			{
				BrowserSize = new Size(520, 800),
				CheckVerifier = false,
				AccessTokenUrl = FLICKR_ACCESS_TOKEN_URL,
				AuthorizeUrl = FLICKR_AUTHORIZE_URL,
				RequestTokenUrl = FLICKR_REQUEST_TOKEN_URL,
				LoginTitle = "Flickr authorization",
				Token = config.FlickrToken,
				TokenSecret = config.FlickrTokenSecret
			};
			if (string.IsNullOrEmpty(oAuth.Token)) {
				if (!oAuth.Authorize()) {
					return null;
				}
				if (!string.IsNullOrEmpty(oAuth.Token)) {
					config.FlickrToken = oAuth.Token;
				}
				if (!string.IsNullOrEmpty(oAuth.TokenSecret)) {
					config.FlickrTokenSecret = oAuth.TokenSecret;
				}
				IniConfig.Save();
			}
			try {
				IDictionary<string, object> signedParameters = new Dictionary<string, object>();
				signedParameters.Add("content_type", "2");	// Screenshot
				signedParameters.Add("tags", "Greenshot");
				signedParameters.Add("is_public", config.IsPublic ? "1" : "0");
				signedParameters.Add("is_friend", config.IsFriend ? "1" : "0");
				signedParameters.Add("is_family", config.IsFamily ? "1" : "0");
				signedParameters.Add("safety_level", $"{(int) config.SafetyLevel}");
				signedParameters.Add("hidden", config.HiddenFromSearch ? "1" : "2");
				IDictionary<string, object> otherParameters = new Dictionary<string, object>();
				otherParameters.Add("photo", new SurfaceContainer(surfaceToUpload, outputSettings, filename));
				string response = oAuth.MakeOAuthRequest(HTTPMethod.POST, FLICKR_UPLOAD_URL, signedParameters, otherParameters, null);
				string photoId = GetPhotoId(response);

				// Get Photo Info
				signedParameters = new Dictionary<string, object> { { "photo_id", photoId } };
				string photoInfo = oAuth.MakeOAuthRequest(HTTPMethod.POST, FLICKR_GET_INFO_URL, signedParameters, null, null);
				return GetUrl(photoInfo);
			} catch (Exception ex) {
				LOG.Error("Upload error: ", ex);
				throw;
			} finally {
				if (!string.IsNullOrEmpty(oAuth.Token)) {
					config.FlickrToken = oAuth.Token;
				}
				if (!string.IsNullOrEmpty(oAuth.TokenSecret)) {
					config.FlickrTokenSecret = oAuth.TokenSecret;
				}
			}
		}

		private static string GetUrl(string response) {
			try {
				XmlDocument doc = new XmlDocument();
				doc.LoadXml(response);
				if (config.UsePageLink) {
					XmlNodeList nodes = doc.GetElementsByTagName("url");
					if (nodes.Count > 0) {
						var xmlNode = nodes.Item(0);
						if (xmlNode != null) {
							return xmlNode.InnerText;
						}
					}
				} else {
					XmlNodeList nodes = doc.GetElementsByTagName("photo");
					if (nodes.Count > 0) {
						var item = nodes.Item(0);
						if (item?.Attributes != null) {
							string farmId = item.Attributes["farm"].Value;
							string serverId = item.Attributes["server"].Value;
							string photoId = item.Attributes["id"].Value;
							string originalsecret = item.Attributes["originalsecret"].Value;
							string originalFormat = item.Attributes["originalformat"].Value;
							return string.Format(FLICKR_FARM_URL, farmId, serverId, photoId, originalsecret, originalFormat);
						}
					}
				}
			} catch (Exception ex) {
				LOG.Error("Error parsing Flickr Response.", ex);
			}
			return null;
		}

		private static string GetPhotoId(string response) {
			try {
				XmlDocument doc = new XmlDocument();
				doc.LoadXml(response);
				XmlNodeList nodes = doc.GetElementsByTagName("photoid");
				if (nodes.Count > 0) {
					var xmlNode = nodes.Item(0);
					if (xmlNode != null) {
						return xmlNode.InnerText;
					}
				}
			} catch (Exception ex) {
				LOG.Error("Error parsing Flickr Response.", ex);
			}
			return null;
		}
	}
}