using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.IO;
using System.Xml.Linq;

namespace SCJMapper_V2.Devices
{
  /// <summary>
  ///   Maintains an CustomisationUIHeader - something like:
  ///
  /// 	<CustomisationUIHeader device="joystick" label="JoystickTMWarthog" description="@ui_JoystickTMWarthogDesc" image="JoystickTMWarthog" />
  /// 	
  /// or 
  /// 
  ///	<CustomisationUIHeader label="JoystickSaitekX55" description="@ui_JoystickSaitekX55Desc" image="JoystickSaitekX55">
  ///		<Devices>
  ///			<joystick instance="1" />
  ///			<joystick instance="2" />
  ///		</Devices>
  ///	</CustomisationUIHeader>
  /// 	</summary>
  public class UICustHeader : ICloneable
  {
    private static readonly log4net.ILog log = log4net.LogManager.GetLogger( System.Reflection.MethodBase.GetCurrentMethod( ).DeclaringType );

    List<string> m_stringOptions = new List<string>( );

    public const string XmlName = "CustomisationUIHeader";


    public struct DevRec : ICloneable
    {
      public string devType;
      public int instNo;

      public object Clone()
      {
        var dr = (DevRec)this.MemberwiseClone( );

        return dr;
      }

      /// <summary>
      /// Check clone against This
      /// </summary>
      /// <param name="clone"></param>
      /// <returns>True if the clone is identical but not a shallow copy</returns>
      public bool CheckClone( DevRec clone )
      {
        bool ret = true;
        ret &= ( this.devType == clone.devType ); // immutable string - shallow copy is OK
        ret &= ( this.instNo == clone.instNo ); // value type
        return ret;
      }
    }
    List<DevRec> m_devInstances = new List<DevRec>( );

    private string m_label = "";
    private string m_description = "";
    private string m_image = "";


    /// <summary>
    /// Clone this object
    /// </summary>
    /// <returns>A deep Clone of this object</returns>
    public object Clone()
    {
      var uic = (UICustHeader)this.MemberwiseClone( );
      // more objects to deep copy
      uic.m_devInstances = m_devInstances.Select( x => (DevRec)x.Clone( ) ).ToList( );

#if DEBUG
      // check cloned item
      System.Diagnostics.Debug.Assert( CheckClone( uic ) );
#endif
      return uic;
    }

    /// <summary>
    /// Check clone against This
    /// </summary>
    /// <param name="clone"></param>
    /// <returns>True if the clone is identical but not a shallow copy</returns>
    private bool CheckClone( UICustHeader clone )
    {
      bool ret = true;
      ret &= ( this.m_stringOptions == clone.m_stringOptions ); // immutable string list - shallow copy is OK
      ret &= ( this.m_label == clone.m_label ); // immutable string - shallow copy is OK
      ret &= ( this.m_description == clone.m_description ); // immutable string - shallow copy is OK
      ret &= ( this.m_image == clone.m_image ); // immutable string - shallow copy is OK

      ret &= ( this.m_devInstances.Count == clone.m_devInstances.Count );
      if ( ret ) {
        for ( int i = 0; i < this.m_devInstances.Count; i++ ) {
          ret &= ( this.m_devInstances[i].CheckClone( clone.m_devInstances[i] ) );
        }
      }
      return ret;
    }


    public int Count
    {
      get { return ( m_stringOptions.Count + m_devInstances.Count ); }
    }

    public string Label
    {
      get { return m_label; }
      set { m_label = value; }
    }

    public void ClearInstances()
    {
      m_devInstances.Clear( );
    }
    public void AddInstances( DevRec dr )
    {
      m_devInstances.Add( dr );
    }


    private string[] FormatXml( string xml )
    {
      try {
        XDocument doc = XDocument.Parse( xml );
        return doc.ToString( ).Split( new string[] { string.Format( "\n" ) }, StringSplitOptions.RemoveEmptyEntries );
      }
      catch ( Exception ) {
        return new string[] { xml };
      }
    }

    /// <summary>
    /// Dump the CustomisationUIHeader as partial XML nicely formatted
    /// </summary>
    /// <returns>the action as XML fragment</returns>
    public string toXML()
    {
      /*
       <CustomisationUIHeader label="sdsd" description="" image="">
        <devices>
         <keyboard instance="1"/>
         <mouse instance="1"/>
         <joystick instance="1"/>
         <joystick instance="2"/>
        </devices>
        <categories>
         <category label="@ui_CCSpaceFlight"/>
         <category label="@ui_CGLightControllerDesc"/>
         <category label="@ui_CCFPS"/>
         <category label="@ui_CCEVA"/>
         <category label="@ui_CCVehicle"/>
         <category label="@ui_CGEASpectator"/>
         <category label="@ui_CGUIGeneral"/>
         <category label="@ui_CGInteraction"/>
         <category label="@ui_CCCamera"/>
        </categories>
       </CustomisationUIHeader>
      */


      string r = "";

      r += string.Format( "\t<{0} label=\"{1}\" description=\"{2}\" image=\"{3}\">\n", XmlName, m_label, m_description, m_image );
      if ( m_devInstances.Count > 0 ) {
        r += string.Format( "\t\t<devices>\n" );

        foreach ( DevRec dr in m_devInstances ) {
          r += string.Format( "\t\t\t<{0} instance=\"{1}\"/>\n", dr.devType, dr.instNo.ToString( ) );
        }

        r += string.Format( "\t\t</devices>\n" );
      }
      // CIG adds them to export - so can we ...
      r += string.Format( "\t\t<categories>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CCSpaceFlight\"/>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CCFPS\"/>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CCEVA\"/>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CCVehicle\"/>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CGEASpectator\"/>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CGUIGeneral\"/>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CGInteraction\"/>\n" );
      r += string.Format( "\t\t<category label=\"@ui_CCCamera\"/>\n" );
      r += string.Format( "\t\t</categories>\n" );

      r += string.Format( "\t</CustomisationUIHeader>\n" );

      // and dump the plain contents if needed
      foreach ( string x in m_stringOptions ) {
        if ( !string.IsNullOrWhiteSpace( x ) ) {
          foreach ( string line in FormatXml( x ) ) {
            r += string.Format( "\t{0}", line );
          }
        }
      }
      r += string.Format( "\n" );
      return r;
    }



    /// <summary>
    /// Read an CustomisationUIHeader from XML - do some sanity check
    /// </summary>
    /// <param name="xml">the XML action fragment</param>
    /// <returns>True if an action was decoded</returns>
    private bool Instance_fromXML( XElement devices )
    {
      /*
		        <devices>
			        <keyboard instance="1"/>
			        <mouse instance="1"/>
			        <joystick instance="1"/>
			        <joystick instance="2"/>
		        </devices>
       */
      foreach ( XElement dev in devices.Nodes( ) ) {
        string devType = (string)dev.Name.LocalName;
        int instNo = 0;
        IEnumerable<XAttribute> attr = dev.Attributes( ).Where( _a => _a.Name == "instance" );
        if ( attr.Count( ) > 0 ) {
          if ( !int.TryParse( attr.ElementAt( 0 ).Value.ToString( ), out instNo ) ) {
            instNo = 0;
          }
          else {
            DevRec dr = new DevRec( );
            dr.devType = devType;
            dr.instNo = instNo;
            m_devInstances.Add( dr );
          }
        }
      }
      return true;
    }


    /// <summary>
    /// Read an CustomisationUIHeader from XML - do some sanity check
    /// </summary>
    /// <param name="xml">the XML action fragment</param>
    /// <returns>True if an action was decoded</returns>
    public bool fromXML( XElement cuiHeader )
    {
      /*
        <CustomisationUIHeader label="my_x55_65o" description="@@ui_JoystickSaitekX55Desc" image="JoystickSaitekX55">
            <devices>
              <keyboard instance="1"/>
              <mouse instance="1"/>
              <joystick instance="1"/>
              <joystick instance="2"/>
            </devices>
            <categories>
            <category label="@ui_CCSpaceFlight"/>
            </categories>
          </CustomisationUIHeader>

       */
      m_label = (string)cuiHeader.Attributes( ).First( a => a.Name == "label" ); // mandadory - else Exception
      IEnumerable<XAttribute> attr = cuiHeader.Attributes( ).Where( _a => _a.Name == "description" );
      if ( attr.Count( ) > 0 )
        m_description = attr.ElementAt( 0 ).Value.ToString( );
      else
        m_description = "@ui_JoystickDefaultDesc";

      attr = cuiHeader.Attributes( ).Where( _a => _a.Name == "image" );
      if ( attr.Count( ) > 0 )
        m_image = attr.ElementAt( 0 ).Value.ToString( );
      else
        m_image = "JoystickDefault";

      // try to disassemble the devices items
      IEnumerable<XElement> elements = from x in cuiHeader.Elements( )
                                       where ( x.Name == "devices" )
                                       select x;
      foreach ( XElement devices in elements ) {
        Instance_fromXML( devices );
      }

      return true;
    }

  }
}