package org.owasp.webgoat.session;

import java.io.PrintWriter;
import java.util.Properties;

import org.apache.ecs.Element;
import org.apache.ecs.HtmlColor;
import org.apache.ecs.StringElement;
import org.apache.ecs.html.A;
import org.apache.ecs.html.B;
import org.apache.ecs.html.Font;
import org.apache.ecs.html.IMG;
import org.apache.ecs.html.TD;
import org.owasp.webgoat.lessons.AbstractLesson;


/**
 *  Copyright (c) 2002 Free Software Foundation developed under the custody of the Open Web
 *  Application Security Project (http://www.owasp.org) This software package org.owasp.webgoat.is published by OWASP
 *  under the GPL. You should read and accept the LICENSE before you use, modify and/or redistribute
 *  this software.
 *
 * @author     Jeff Williams <a href="http://www.aspectsecurity.com">Aspect Security</a>
 * @created    October 28, 2003
 */
public abstract class Screen
{
	/**
	 *  Description of the Field
	 */
	public static int MAIN_SIZE = 375;


	//private Head head;
	private Element content;
	private LessonTracker lessonTracker;
	final static IMG logo = new IMG( "images/aspectlogo-horizontal-small.jpg" ).setAlt( "Aspect Security" ).setBorder( 0 ).setHspace( 0 ).setVspace( 0 );


	/**
	 *  Constructor for the Screen object
	 */

	public Screen() { }


	// FIXME: Each lesson should have a role assigned to it.  Each user/student
	//        should also have a role(s) assigned.  The user would only be allowed
	// 		  to see lessons that correspond to their role.  Eventually these roles
	//		  will be stored in the internal database.  The user will be able to hack
	// 		  into the database and change their role.  This will allow the user to
	//		  see the admin screens, once they figure out how to turn the admin switch on.
	public abstract String getRole();

	/**
	 *  Description of the Method
	 *
	 * @param  s  Description of the Parameter
	 * @return    Description of the Return Value
	 */

	protected abstract Element createContent( WebSession s );



	/**
	 *  Gets the credits attribute of the Screen object
	 *
	 * @return    The credits value
	 */
	public abstract Element getCredits();


	/**
	 *  Creates a new lessonTracker object.
	 *
	 * @param  props  The properties file that was used to persist the user data.
	 * @return        Description of the Return Value
	 */

	public LessonTracker createLessonTracker( Properties props )
	{

		// If the lesson had any specialized properties in the user persisted properties,
		// now would be the time to pull them out.

		lessonTracker = createLessonTracker();
		return lessonTracker;
	}


	/**
	 *  This allows the screens to provide a custom LessonTracker object if needed.
	 *
	 * @return    Description of the Return Value
	 */
	public LessonTracker createLessonTracker()
	{
		lessonTracker = new LessonTracker();
		return lessonTracker;
	}



	/**
	 *  Gets the lessonTracker attribute of the AbstractLesson object
	 *
	 * @param  userName  Description of the Parameter
	 * @return           The lessonTracker value
	 */

	public LessonTracker getLessonTracker( WebSession s )
	{
		UserTracker userTracker = UserTracker.instance();
		return userTracker.getLessonTracker( s, this );
	}

	public LessonTracker getLessonTracker( WebSession s, String userNameOverride )
	{
		UserTracker userTracker = UserTracker.instance();
		return userTracker.getLessonTracker( s, userNameOverride, this );
	}

	
	public LessonTracker getLessonTracker( WebSession s, AbstractLesson lesson )
	{
		UserTracker userTracker = UserTracker.instance();
		return userTracker.getLessonTracker( s, lesson );
	}

	/**
	 *  Fill in a descriptive title for this lesson
	 *
	 * @return    The title value
	 */
	public abstract String getTitle();


	protected void setContent(Element content)
	{
		this.content = content;
	}

	/**
	 *  Description of the Method
	 *
	 * @return    Description of the Return Value
	 */

	protected Element makeLogo()
	{

		return new A("http://www.aspectsecurity.com/webgoat.html", logo);
	}

	public String getSponsor()
	{
		return "Aspect Security";
	}

	public String getSponsorLogoResource()
	{
		return "images/aspectlogo-horizontal-small.jpg";
	}


	/**
	 *  Description of the Method
	 *
	 * @param  text  Description of the Parameter
	 * @return       Description of the Return Value
	 */

	protected TD makeMenuCategory_DELETE_ME( String text )
	{
		return ( new TD().setWidth( "100%" ).addElement( new Font().setColor( HtmlColor.WHITE ).addElement( new B().addElement( text ) ) ) );
	}



	/**
	 *  Description of the Method
	 *
	 * @param  s  Description of the Parameter
	 * @return    Description of the Return Value
	 */

	protected Element makeMessages( WebSession s )
	{

		if ( s == null )
		{

			return ( new StringElement( "" ) );
		}

		Font f = new Font().setColor( HtmlColor.RED );

		String message = s.getMessage();

		f.addElement( message );

		return ( f );
	}



	/**
	 *  Returns the content length of the the html.
	 *
	 */

	public int getContentLength()
	{
		return content.toString().length();
	}
	
	
	/**
	 *  Description of the Method
	 *
	 * @param  out  Description of the Parameter
	 */

	public void output( PrintWriter out )
	{

		// format output -- then send to printwriter

		// otherwise we're doing way too much SSL encryption work

		out.print( content.toString() );

	}

	public String getContent()
	{
		return (content == null) ? "" : content.toString();
	}


	/**
	 *  Description of the Method
	 *
	 * @param  x  Description of the Parameter
	 * @return    Description of the Return Value
	 */

	protected static String pad( int x )
	{

		StringBuffer sb = new StringBuffer();

		if ( x < 10 )
		{

			sb.append( " " );

		}

		if ( x < 100 )
		{

			sb.append( " " );

		}

		sb.append( x );

		return ( sb.toString() );
	}


	/**
	 *  Description of the Method
	 *
	 * @param  token  Description of the Parameter
	 * @return        Description of the Return Value
	 */
	protected static String convertMetachars( String token )
	{

		int mci = 0;

		/*
         *  meta char array
         * 
         * FIXME: Removed the conversion of whitespace " " to "&nbsp" in order for the 
         * html to be automatically wrapped in client browser. It is better to add line 
         * length checking and only do "&nbsp" conversion in lines that won't exceed 
         * screen size, say less than 80 characters.     
         */
		String[] metaChar = {"&", "<", ">", "\"", "\t", System.getProperty("line.separator")};

		String[] htmlCode = {"&amp;", "&lt;", "&gt;", "&quot;", "    ", "<br>"};

		String replacedString = token;
		for ( ; mci < metaChar.length; mci += 1 )
		{
			replacedString = replacedString.replaceAll( metaChar[mci], htmlCode[mci] );
		}
		return ( replacedString );
	}

	/**
	 *  Description of the Method
	 *
	 * @param  token  Description of the Parameter
	 * @return        Description of the Return Value
	 */
	protected static String convertMetacharsJavaCode( String token )
	{
		return( convertMetachars(token).replaceAll(" ", "&nbsp;") );
	}
	

	/**
	 *  Description of the Method
	 *
	 * @param  s  Description of the Parameter
	 * @return    Description of the Return Value
	 */

	//protected abstract Element wrapForm( WebSession s );

}