using System;
using System.Diagnostics;
using System.Collections.Specialized;
using System.Xml;

namespace toolbag
{
    public class Configuration
    {
        public const string CONSOLE = "Console";
        public const string SERVICE = "Service";
        public const string WEBSITE = "Website";

        public const string PROJECT_TYPE = "ProjectType";
        public const string PROJECT_NAME = "ProjectName";

        public const string LOG_CONSOLE = "LogConsole";
        public const string LOG_FILE = "LogFile";
        public const string LOG_EVENT = "LogEvent";

        private NameValueCollection settings = new NameValueCollection();

        private static Configuration instance = null;

        private string filename = "config.xml";

        private bool autosave = false;
        public bool Autosave
        {
            get
            {
                return autosave;
            }
            set
            {
                autosave = value;
            }
        }

        private Configuration()
        {
            settings[PROJECT_TYPE] = CONSOLE;
            settings[PROJECT_NAME] = "Project";

            ReadSettings();
        }

        public Configuration(string filename)
        {
            this.filename = filename;
            ReadSettings();
        }

        private void ReadSettings()
        {
            try
            {
                XmlTextReader reader = new XmlTextReader(filename);
                while (reader.Read())
                {
                    if (reader.NodeType == XmlNodeType.Element)
                    {
                        string key = reader.GetAttribute("key");
                        if (key != null)
                        {
                            string value = reader.GetAttribute("value");
                            settings[key] = value;
                        }
                    }
                }
                reader.Close();
            }
            catch (Exception ex)
            {
                Debug.Write(ex.Message);
            }
        }

        private void WriteSettings()
        {
            try
            {
                XmlDocument document = new XmlDocument();
                XmlNode declaration = (XmlNode)document.CreateXmlDeclaration("1.0", null, null);
                document.AppendChild(declaration);
                XmlNode settingsNode = document.CreateElement("settings");
                document.AppendChild(settingsNode);
                foreach (string key in settings.Keys)
                {
                    XmlNode settingNode = document.CreateElement("setting");
                    XmlAttribute keyAttribute = document.CreateAttribute("key");
                    keyAttribute.Value = key;
                    settingNode.Attributes.Append(keyAttribute);
                    XmlAttribute valueAttribute = document.CreateAttribute("value");
                    valueAttribute.Value = settings[key];
                    settingNode.Attributes.Append(valueAttribute);
                    settingsNode.AppendChild(settingNode);
                }
                document.Save(filename);
            }
            catch (Exception ex)
            {
                Debug.Write(ex.Message);
            }
        }

        public void Save()
        {
            WriteSettings();
        }

        public string this[string key]
        {
            get
            {
                return settings[key];
            }

            set
            {
                settings[key] = value;
                if (autosave) Save();
            }
        }

        public static Configuration GetInstance()
        {
            if (instance == null)
            {
                instance = new Configuration();
            }
            return instance;
        }

        public int GetInt32(string key)
        {
            return Int32.Parse(settings[key]);
        }
    }
}