/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2015 Thomas Braun, Jens Klingen, Robin Krom, Francis Noel
 * 
 * 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 Greenshot.IniFile;
using GreenshotPlugin.Core;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Runtime.Serialization.Json;
using System.Text;

namespace GreenshotBoxPlugin {

	/// <summary>
	/// Description of ImgurUtils.
	/// </summary>
	public static class BoxUtils {
		private static readonly log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(BoxUtils));
		private static readonly BoxConfiguration Config = IniConfig.GetIniSection<BoxConfiguration>();
		private const string UploadFileUri = "https://upload.box.com/api/2.0/files/content";
		private const string FilesUri = "https://www.box.com/api/2.0/files/{0}";

		/// <summary>
		/// Put string
		/// </summary>
		/// <param name="url"></param>
		/// <param name="content"></param>
		/// <param name="settings">OAuth2Settings</param>
		/// <returns>response</returns>
		public static string HttpPut(string url, string content, OAuth2Settings settings) {
			var webRequest= OAuth2Helper.CreateOAuth2WebRequest(HTTPMethod.PUT, url, settings);

			byte[] data = Encoding.UTF8.GetBytes(content);
			using (var requestStream = webRequest.GetRequestStream()) {
				requestStream.Write(data, 0, data.Length);
			}
			return NetworkHelper.GetResponseAsString(webRequest);
		}

		/// <summary>
		/// Do the actual upload to Box
		/// For more details on the available parameters, see: http://developers.box.net/w/page/12923951/ApiFunction_Upload%20and%20Download
		/// </summary>
		/// <param name="image">Image for box upload</param>
		/// <param name="title">Title of box upload</param>
		/// <param name="filename">Filename of box upload</param>
		/// <returns>url to uploaded image</returns>
		public static string UploadToBox(SurfaceContainer image, string title, string filename) {

			// Fill the OAuth2Settings
			OAuth2Settings settings = new OAuth2Settings();

			settings.AuthUrlPattern = "https://www.box.com/api/oauth2/authorize?client_id={ClientId}&response_type={response_type}&state{State}&redirect_uri={RedirectUrl}";
			settings.TokenUrlPattern = "https://www.box.com/api/oauth2/token";
			settings.CloudServiceName = "Box";
			settings.ClientId = BoxCredentials.ClientId;
			settings.ClientSecret = BoxCredentials.ClientSecret;
			settings.RedirectUrl = "https://www.box.com/home/";
			settings.BrowserSize = new Size(1060, 600);
			settings.AuthorizeMode = OAuth2AuthorizeMode.EmbeddedBrowser;

			// Copy the settings from the config, which is kept in memory and on the disk
			settings.RefreshToken = Config.RefreshToken;
			settings.AccessToken = Config.AccessToken;
			settings.AccessTokenExpires = Config.AccessTokenExpires;

			try {
				var webRequest = OAuth2Helper.CreateOAuth2WebRequest(HTTPMethod.POST, FilesUri, settings);
				IDictionary<string, object> parameters = new Dictionary<string, object>();
				if (Config.AddFilename) {
					parameters.Add("filename", image);
				}
				parameters.Add("parent_id", Config.FolderId);

				NetworkHelper.WriteMultipartFormData(webRequest, parameters);

				var response = NetworkHelper.GetResponseAsString(webRequest);

				LOG.DebugFormat("Box response: {0}", response);

				var upload = JsonSerializer.Deserialize<Upload>(response);
				if (upload == null || upload.Entries == null || upload.Entries.Count == 0) return null;

				if (Config.UseSharedLink) {
					string filesResponse = HttpPut(string.Format(FilesUri, upload.Entries[0].Id), "{\"shared_link\": {\"access\": \"open\"}}", settings);
					var file = JsonSerializer.Deserialize<FileEntry>(filesResponse);
					return file.SharedLink.Url;
				}
				return string.Format("http://www.box.com/files/0/f/0/1/f_{0}", upload.Entries[0].Id);
			} finally {
				// Copy the settings back to the config, so they are stored.
				Config.RefreshToken = settings.RefreshToken;
				Config.AccessToken = settings.AccessToken;
				Config.AccessTokenExpires = settings.AccessTokenExpires;
				Config.IsDirty = true;
			}
		}
	}
	/// <summary>
	/// A simple helper class for the DataContractJsonSerializer
	/// </summary>
	internal static class JsonSerializer {
		/// <summary>
		/// Helper method to serialize object to JSON
		/// </summary>
		/// <param name="jsonObject">JSON object</param>
		/// <returns>string</returns>
		public static string Serialize(object jsonObject) {
			var serializer = new DataContractJsonSerializer(jsonObject.GetType());
			using (MemoryStream stream = new MemoryStream()) {
				serializer.WriteObject(stream, jsonObject);
				return Encoding.UTF8.GetString(stream.ToArray());
			}
		}

		/// <summary>
		/// Helper method to parse JSON to object
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="jsonString"></param>
		/// <returns></returns>
		public static T Deserialize<T>(string jsonString) {
			var deserializer = new DataContractJsonSerializer(typeof(T));
			using (MemoryStream stream = new MemoryStream()) {
				byte[] content = Encoding.UTF8.GetBytes(jsonString);
				stream.Write(content, 0, content.Length);
				stream.Seek(0, SeekOrigin.Begin);
				return (T)deserializer.ReadObject(stream);
			}
		}
	}
}