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

namespace SCJMapper_V2
{
  /// <summary>
  /// should read the default profile - may be replacing the MappingVars once
  /// </summary>
  class DProfileReader
  {
    public Boolean ValidContent { get; set; }

    private Stack<String> m_nodeNameStack = null; // element name stack - keeping track where we are

    // state for the parser
    enum EState
    {
      idle = 0,
      inActionMap,
    }
    private EState m_state = EState.idle;

    // an action map and its actions
    class Action
    {
      public String name { get; set; }    // the action name
      public String input { get; set; }  // the input method K,J,X,P
      private String m_defBinding = "";
      public String defBinding { get { return m_defBinding;} set { m_defBinding = value.Trim();} }  // need to clean this one, found spaces...
      public String keyName
      { get { return input + name; } } // prep for TreView usage - create a key from input+name
    }
    class ActionMap : List<Action>  // carries the action list
    {
      public String name { get; set; } // the map name
    };
    Dictionary<String, ActionMap> m_aMap = null; // key would be the actionmap name
    ActionMap m_currentMap = null;

    // actionmap names to gather (do we need them to be cofigurable ??)
    private String[] c_exMaps = { "spaceship_general", "spaceship_view", "spaceship_movement", "spaceship_targeting", "spaceship_weapons", "spaceship_missiles", 
                                "spaceship_defensive", "spaceship_auto_weapons", "spaceship_radar" , "spaceship_hud" , "IFCS_controls" , "" , "" , "" };


    public DProfileReader( )
    {
      ValidContent = false; // default
    }


    /// <summary>
    /// Returns the collected actionmaps as CSV (same format as MappingVars)
    /// i.e. one line per actionmap where the first element is the actionmap and following are actions;defaultBinding lead by the input Key in uppercase (JKXP)
    /// </summary>
    public String CSVMap
    {
      get
      {
        String buf = "";
        foreach ( ActionMap am in m_aMap.Values ) {
          buf += am.name + ";";
          foreach ( Action a in am ) {
            buf += a.keyName + ";" + a.defBinding + ";"; // add default binding to the CSV
          }
          buf += String.Format( "\n" );
        }
        return buf;
      }
    }


    /// <summary>
    /// Assumes to be in an action element
    /// retrieves the attributes and collects the various control=binding pairs
    /// </summary>
    /// <param name="xr">An XML reader @ StartElement</param>
    private void CollectActions( XmlReader xr, Dictionary<string, string> attr )
    {
      // we collect actions for each input ie for K,J,X and P
      if ( attr.ContainsKey( "joystick" ) ) {
        Action ac = new Action( );
        ac.name = attr["name"];
        ac.input = "J";
        ac.defBinding = attr["joystick"];
        if ( !String.IsNullOrEmpty( ac.defBinding ) ) m_currentMap.Add( ac );  // finally add it to the current map if it was bound
      }
      if ( attr.ContainsKey( "keyboard" ) ) {
        Action ac = new Action( );
        ac.name = attr["name"];
        ac.input = "K";
        ac.defBinding = attr["keyboard"];
        if ( !String.IsNullOrEmpty( ac.defBinding ) ) m_currentMap.Add( ac );  // finally add it to the current map if it was bound
      }
      if ( attr.ContainsKey( "xboxpad" ) ) {
        Action ac = new Action( );
        ac.name = attr["name"];
        ac.input = "X";
        ac.defBinding = attr["xboxpad"];
        if ( !String.IsNullOrEmpty( ac.defBinding ) ) m_currentMap.Add( ac );  // finally add it to the current map if it was bound
      }
      if ( attr.ContainsKey( "ps3pad" ) ) {
        Action ac = new Action( );
        ac.name = attr["name"];
        ac.input = "P";
        ac.defBinding = attr["ps3pad"];
        if ( !String.IsNullOrEmpty( ac.defBinding ) ) m_currentMap.Add( ac );  // finally add it to the current map if it was bound
      }
    }


    /// <summary>
    /// Read one 'empty' XML element
    /// 
    /// <name [attr="" ..] />
    /// 
    /// </summary>
    /// <param name="xr">An XML reader @ StartElement</param>
    /// <returns>True if reading can continue</returns>
    private Boolean ReadEmptyElement( XmlReader xr )
    {
      Dictionary<String, String> attr = new Dictionary<string, string>( );
      String eName = xr.Name;
      switch ( xr.NodeType ) {
        case XmlNodeType.Element:
          //Console.Write( "<{0}", xr.Name );
          while ( xr.MoveToNextAttribute( ) ) {
            attr.Add( xr.Name, xr.Value );  // save the attributes
            //Console.Write( " {0}='{1}'", xr.Name, xr.Value );
          }
          if ( m_state == EState.inActionMap ) {
            // processing a valid action map - collect actions
            if ( eName.ToLower( ) == "action" ) {
              // this is an action.. - collect it
              CollectActions( xr, attr );
            }
          }// if inmap
          //Console.Write( ">\n" );

          break;
        case XmlNodeType.Text:
          //Console.Write( xr.Value );
          break;
        case XmlNodeType.EndElement:
          //Console.Write( "</{0}>\n", xr.Name );
          break;
      }

      return true;
    }

    /// <summary>
    /// Reads an action sub element
    /// </summary>
    /// <param name="xr">An XML reader @ StartElement</param>
    private void ReadActionSub( XmlReader xr, String actionName )
    {
      //<action name="v_brake" onPress="1" onHold="1" onRelease="1" keyboard="space" xboxpad="xi_shoulderl+xi_shoulderr">
      //	<joystick input="js2_button7" />        
      //	<joystick input="js2_button8" />
      //</action>
      //or
      //<action name="v_hud_confirm" onPress="1" onRelease="1" xboxpad="xi_triggerL_btn+xi_a" joystick="js1_button19">
      //	<keyboard>
      //		<inputdata input="enter"/>
      //	</keyboard>
      //</action>
      Boolean done = false;
      do {
        xr.Read( ); // get next element
        Dictionary<String, String> attr = new Dictionary<string, string>( );
        String eName = xr.Name;
        while ( xr.MoveToNextAttribute( ) ) {
          attr.Add( xr.Name, xr.Value );  // save the attributes
          //Console.Write( " {0}='{1}'", xr.Name, xr.Value );
        }
        xr.MoveToElement( ); // backup
        Action ac = new Action( );
        ac.name = actionName;
        // the element name is a control
        if ( xr.NodeType == XmlNodeType.EndElement ) {
          done = ( xr.Name == "action" );
        }
        else if ( xr.IsEmptyElement ) {
          // an attribute only element
          ac.input = ActionCls.DevID( eName );
          ac.defBinding = attr["input"];
          if ( !String.IsNullOrEmpty( ac.defBinding ) ) m_currentMap.Add( ac );  // finally add it to the current map if it was bound
        }
        else {
          // one with subelements again
          xr.Read( );
          ac.input = ActionCls.DevID( eName );
          ac.defBinding = xr["input"];
          if ( !String.IsNullOrEmpty( ac.defBinding ) ) m_currentMap.Add( ac );  // finally add it to the current map if it was bound
        }
      } while ( !done );
      m_nodeNameStack.Pop( ); // action is finished
    }

    /// <summary>
    /// Read one XML element 
    /// 
    /// <name attr="">
    ///   [ Xelement ]
    /// </name>
    /// 
    /// </summary>
    /// <param name="xr">An XML reader @ StartElement</param>
    /// <returns>True if reading can continue</returns>
    private Boolean ReadElement( XmlReader xr )
    {
      Dictionary<String, String> attr = new Dictionary<string, string>( );
      String eName = xr.Name;
      switch ( xr.NodeType ) {
        case XmlNodeType.Element:
          //Console.Write( "<{0}", xr.Name );
          while ( xr.MoveToNextAttribute( ) ) {
            attr.Add( xr.Name, xr.Value );  // save the attributes
            //Console.Write( " {0}='{1}'", xr.Name, xr.Value );
          }
          // now here we could have an actionmap start
          if ( m_state == EState.idle ) {
            if ( m_nodeNameStack.Peek( ).ToLower( ) == "actionmap" ) {
              // check for a valid one
              String mapName = attr["name"];
              String item = Array.Find( c_exMaps, delegate( String sstr ) {
                return sstr == mapName;
              } );
              if ( !String.IsNullOrEmpty( item ) ) {
                // finally.... it is a valid actionmap
                m_currentMap = new ActionMap( );
                m_currentMap.name = mapName;
                m_aMap.Add( mapName, m_currentMap ); // add to our inventory
                m_state = EState.inActionMap; // now we are in and processing the map
              }
            }
          }
          else if ( m_state == EState.inActionMap ) {
            // processing a valid action map - collect actions
            if ( eName.ToLower( ) == "action" ) {
              // this is an action.. - collect it
              CollectActions( xr, attr );
              ReadActionSub( xr, attr["name"] ); // a non empty action element may have a sub element
            }
          }
          //Console.Write( ">\n" );
          break;
        case XmlNodeType.Text:
          //Console.Write( xr.Value );
          break;
        case XmlNodeType.EndElement:
          //Console.Write( "</{0}>\n", xr.Name );
          break;
      }
      return true;
    }


    /// <summary>
    /// Read the xml part
    /// </summary>
    /// <param name="xr"></param>
    /// <returns></returns>
    private Boolean ReadXML( XmlReader xr )
    {
      Boolean retVal = true;

      try {
        do {
          if ( xr.IsStartElement( ) ) {
            m_nodeNameStack.Push( xr.Name );
            if ( xr.IsEmptyElement ) {
              retVal = retVal && ReadEmptyElement( xr );
              m_nodeNameStack.Pop( ); // empty ones end inline
            }
            else {
              retVal = retVal && ReadElement( xr );
            }
          }
          else if ( xr.NodeType == XmlNodeType.EndElement ) {
            //Console.Write( "</{0}>\n", xr.Name );
            String exitElement = m_nodeNameStack.Pop( );
            if ( m_state == EState.inActionMap )
              if ( exitElement.ToLower( ) == "actionmap" ) m_state = EState.idle; // finished 
          }

        } while ( xr.Read( ) );

        if ( m_nodeNameStack.Count == 0 )
          return retVal && true;
        else
          return false;

      }
      catch {
        // get any exceptions from reading
        return false;
      }
    }

    /// <summary>
    /// Read the defaultProfile.xml - do some sanity check
    /// </summary>
    /// <param name="xml">the XML action defaultProfile Content</param>
    /// <returns>True if an action was decoded</returns>
    public Boolean fromXML( String xml )
    {
      XmlReaderSettings settings = new XmlReaderSettings( );
      settings.ConformanceLevel = ConformanceLevel.Fragment;
      settings.IgnoreWhitespace = true;
      settings.IgnoreComments = true;
      XmlReader reader = XmlReader.Create( new StringReader( xml ), settings );

      m_nodeNameStack = new Stack<String>( );
      m_aMap = new Dictionary<String, ActionMap>( );

      reader.Read( );
      ValidContent = ReadXML( reader );

      return ValidContent;
    }




  }
}