// Config.cs
// 
// Copyright (C) 2008,2009 Bartek Jasicki
//
// This file is part of Grubng.
//
// Grubng 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 3 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/>.
//

/**@file Config.cs
 * Provide functions for config files.*/

using System;
using System.Xml;

namespace grubupload
{
	
	/**Provide functions for config files.*/
	internal static class Config
	{
		
		/**Function create grub.xml file and write default configuration.*/
		public static void CreateConfig()
		{
			XmlTextWriter xmlw = new XmlTextWriter("grub.xml", null);
			xmlw.Formatting = Formatting.Indented;
			xmlw.WriteStartDocument(false);
			xmlw.WriteStartElement("configuration");
			xmlw.WriteElementString("workdir", "/home/thindil/tmp");
			xmlw.WriteElementString("tempdir", "/home/thindil/tmp");
			xmlw.WriteElementString("address", "*");
			xmlw.WriteElementString("port", "8080");
			xmlw.WriteElementString("hashpass", "HASHPASS");
			xmlw.WriteElementString("enablelog", "Y");
			xmlw.WriteElementString("logpath", "/home/thindil/tmp/grubupload.log");
			xmlw.WriteElementString("enableapi", "Y");
			xmlw.WriteElementString("enabledb", "Y");
			xmlw.WriteElementString("dbpath", "/home/thindil/tmp/grupupload.db");
			xmlw.WriteElementString("minfreespace", "1024");
			xmlw.WriteElementString("checkevery", "30");
			xmlw.WriteElementString("enableupload", "N");
			xmlw.WriteElementString("hadooppath", "/path/to/hadoop");
			xmlw.WriteElementString("uploadpath", "/path/to/upload");
			xmlw.WriteElementString("hadoopfreespace", "10240");
			xmlw.WriteEndElement();
			xmlw.Flush();
			xmlw.Close();			
		}
		
		/**Function read data from grub.xml file.
		 * @param node XML node which been read*/
		public static string ReadConfig(string node)
		{
			XmlDocument doc = new XmlDocument();
			try
			{
				doc.Load("grub.xml");
			}
			catch (XmlException)
			{
				return "Invalid XML";
			}
			string answer = null;
			try
			{
				XmlNode noder = doc.SelectSingleNode(node);
				answer = noder.InnerText;
				doc = null;
			}
			catch (System.NullReferenceException)
			{
				answer = String.Empty;
			}
			return answer;
		}
		
		/**Function insert new data to grub.xml file.
		 * @param data Value which been inserted to file
		 * @param name Name of XML Element which been inserted to file*/
		private static void InsertConfig(string data, string name)
		{
			XmlDocument doc = new XmlDocument();
			doc.Load("grub.xml");
			XmlNode nodew = doc.SelectSingleNode("/configuration");
			XmlNode childNode = doc.CreateNode(XmlNodeType.Element, name, String.Empty);
			childNode.InnerText = data;
			childNode = nodew.AppendChild(childNode);
			doc.Save("grub.xml");
			doc = null;
		}
		
		/**Function update config file.*/
		public static void UpdateConfig()
		{
			XmlDocument doc = new XmlDocument();
			doc.Load("grub.xml");
			string[] nodes = new string[16] {"workdir", "tempdir", "address", "port",
				"hashpass", "enablelog", "logpath", "enableapi", "enabledb", "dbpath",
				"minfreespace", "checkevery", "enableupload", "hadooppath", "uploadpath",
				"hadoopfreespace"};
			string[] values = new string[16] {"/home/thindil/tmp", "/home/thindil/tmp",
			"*", "8080", "HASHPASS", "Y", "/home/thindil/tmp/grubupload.log", "Y", "Y",
			"/home/thindil/tmp/grupupload.db", "1024", "30", "N", "/path/to/hadoop",
			"/path/to/upload", "10240"};
			XmlNode noder;
			foreach (string node in nodes)
			{
				noder = doc.SelectSingleNode("/configuration/" + node);
				if (noder == null)
				{
					int index = Array.IndexOf(nodes, node);
					Config.InsertConfig(values[index], node);
				}
			}
			doc = null;
		}
	}
}