package org.owasp.webgoat.lessons;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;
import org.apache.ecs.Element;
import org.apache.ecs.ElementContainer;
import org.apache.ecs.StringElement;
import org.apache.ecs.html.Body;
import org.apache.ecs.html.Form;
import org.apache.ecs.html.Head;
import org.apache.ecs.html.Html;
import org.apache.ecs.html.IMG;
import org.apache.ecs.html.PRE;
import org.apache.ecs.html.Title;
import org.owasp.webgoat.session.ParameterNotFoundException;
import org.owasp.webgoat.session.Screen;
import org.owasp.webgoat.session.WebSession;
import org.owasp.webgoat.session.WebgoatContext;
import org.owasp.webgoat.session.WebgoatProperties;


/***************************************************************************************************
 * 
 * 
 * This file is part of WebGoat, an Open Web Application Security Project utility. For details,
 * please see http://www.owasp.org/
 * 
 * Copyright (c) 2002 - 2007 Bruce Mayhew
 * 
 * This program 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 * 
 * Getting Source ==============
 * 
 * Source for this application is maintained at code.google.com, a repository for free software
 * projects.
 * 
 * For details, please see http://code.google.com/p/webgoat/
 * 
 * @author Bruce Mayhew <a href="http://code.google.com/p/webgoat">WebGoat</a>
 * @created October 28, 2003
 */
public abstract class AbstractLesson extends Screen implements Comparable
{

	/**
	 * Description of the Field
	 */
	public final static String ADMIN_ROLE = "admin";

	public final static String CHALLENGE_ROLE = "challenge";

	/**
	 * Description of the Field
	 */
	public final static String HACKED_ADMIN_ROLE = "hacked_admin";

	/**
	 * Description of the Field
	 */
	public final static String USER_ROLE = "user";

	private static int count = 1;

	private Integer id = null;

	final static IMG nextGrey = new IMG("images/right16.gif").setAlt("Next").setBorder(0).setHspace(0).setVspace(0);

	final static IMG previousGrey = new IMG("images/left14.gif").setAlt("Previous").setBorder(0).setHspace(0)
			.setVspace(0);

	private Integer ranking;

	private Category category;

	private boolean hidden;

	private String sourceFileName;

	private String lessonPlanFileName;

	private String lessonSolutionFileName;

	private WebgoatContext webgoatContext;

	/**
	 * Constructor for the Lesson object
	 */
	public AbstractLesson()
	{
		id = new Integer(++count);
	}

	public String getName()
	{
		String className = getClass().getName();
		return className.substring(className.lastIndexOf('.') + 1);
	}

	public void setRanking(Integer ranking)
	{
		this.ranking = ranking;
	}

	public void setHidden(boolean hidden)
	{
		this.hidden = hidden;
	}

	public void update(WebgoatProperties properties)
	{
		String className = getClass().getName();
		className = className.substring(className.lastIndexOf(".") + 1);
		setRanking(new Integer(properties.getIntProperty("lesson." + className + ".ranking", getDefaultRanking()
				.intValue())));
		String categoryRankingKey = "category." + getDefaultCategory().getName() + ".ranking";
		// System.out.println("Category ranking key: " + categoryRankingKey);
		Category tempCategory = Category.getCategory(getDefaultCategory().getName());
		tempCategory.setRanking(new Integer(properties.getIntProperty(categoryRankingKey, getDefaultCategory()
				.getRanking().intValue())));
		category = tempCategory;
		setHidden(properties.getBooleanProperty("lesson." + className + ".hidden", getDefaultHidden()));
		// System.out.println(className + " in " + tempCategory.getName() + "
		// (Category Ranking: " + tempCategory.getRanking() + " Lesson ranking:
		// " + getRanking() + ", hidden:" + hidden +")");
	}

	public boolean isCompleted(WebSession s)
	{
		return getLessonTracker(s, this).getCompleted();
	}

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

	/**
	 * Description of the Method
	 * 
	 * @param obj
	 *            Description of the Parameter
	 * @return Description of the Return Value
	 */
	public int compareTo(Object obj)
	{
		return this.getRanking().compareTo(((AbstractLesson) obj).getRanking());
	}

	/**
	 * Description of the Method
	 * 
	 * @param obj
	 *            Description of the Parameter
	 * @return Description of the Return Value
	 */
	public boolean equals(Object obj)
	{
		return this.getScreenId() == ((AbstractLesson) obj).getScreenId();
	}

	/**
	 * Gets the category attribute of the Lesson object
	 * 
	 * @return The category value
	 */
	public Category getCategory()
	{
		return category;
	}

	protected abstract Integer getDefaultRanking();

	protected abstract Category getDefaultCategory();

	protected abstract boolean getDefaultHidden();

	/**
	 * Gets the fileMethod attribute of the Lesson class
	 * 
	 * @param reader
	 *            Description of the Parameter
	 * @param methodName
	 *            Description of the Parameter
	 * @param numbers
	 *            Description of the Parameter
	 * @return The fileMethod value
	 */
	public static String getFileMethod(BufferedReader reader, String methodName, boolean numbers)
	{
		int count = 0;
		StringBuffer sb = new StringBuffer();
		boolean echo = false;
		boolean startCount = false;
		int parenCount = 0;

		try
		{
			String line;

			while ((line = reader.readLine()) != null)
			{
				if ((line.indexOf(methodName) != -1)
						&& ((line.indexOf("public") != -1) || (line.indexOf("protected") != -1) || (line
								.indexOf("private") != -1)))
				{
					echo = true;
					startCount = true;
				}

				if (echo && startCount)
				{
					if (numbers)
					{
						sb.append(pad(++count) + "    ");
					}

					sb.append(line + "\n");
				}

				if (echo && (line.indexOf("{") != -1))
				{
					parenCount++;
				}

				if (echo && (line.indexOf("}") != -1))
				{
					parenCount--;

					if (parenCount == 0)
					{
						startCount = false;
						echo = false;
					}
				}
			}

			reader.close();
		} catch (Exception e)
		{
			System.out.println(e);
			e.printStackTrace();
		}

		return (sb.toString());
	}

	/**
	 * Reads text from a file into an ElementContainer. Each line in the file is represented in the
	 * ElementContainer by a StringElement. Each StringElement is appended with a new-line
	 * character.
	 * 
	 * @param reader
	 *            Description of the Parameter
	 * @param numbers
	 *            Description of the Parameter
	 * @return Description of the Return Value
	 */
	public static String readFromFile(BufferedReader reader, boolean numbers)
	{
		return (getFileText(reader, numbers));
	}

	/**
	 * Gets the fileText attribute of the Screen class
	 * 
	 * @param reader
	 *            Description of the Parameter
	 * @param numbers
	 *            Description of the Parameter
	 * @return The fileText value
	 */
	public static String getFileText(BufferedReader reader, boolean numbers)
	{
		int count = 0;
		StringBuffer sb = new StringBuffer();

		try
		{
			String line;

			while ((line = reader.readLine()) != null)
			{
				if (numbers)
				{
					sb.append(pad(++count) + "  ");
				}
				sb.append(line + System.getProperty("line.separator"));
			}

			reader.close();
		} catch (Exception e)
		{
			System.out.println(e);
			e.printStackTrace();
		}

		return (sb.toString());
	}

	/**
	 * Will this screen be included in an enterprise edition.
	 * 
	 * @return The ranking value
	 */
	public boolean isEnterprise()
	{
		return false;
	}

	/**
	 * Gets the hintCount attribute of the Lesson object
	 * 
	 * @param s
	 *            The user's WebSession
	 * 
	 * @return The hintCount value
	 */
	public int getHintCount(WebSession s)
	{
		return getHints(s).size();
	}

	protected abstract List<String> getHints(WebSession s);

	/**
	 * Fill in a minor hint that will help people who basically get it, but are stuck on somthing
	 * silly.
	 * 
	 * @param s
	 *            The users WebSession
	 * 
	 * @return The hint1 value
	 */
	public String getHint(WebSession s, int hintNumber)
	{
		return getHints(s).get(hintNumber);
	}

	/**
	 * Gets the instructions attribute of the AbstractLesson object
	 * 
	 * @return The instructions value
	 */
	public abstract String getInstructions(WebSession s);

	/**
	 * Gets the lessonPlan attribute of the Lesson object
	 * 
	 * @return The lessonPlan value
	 */
	protected String getLessonName()
	{
		int index = this.getClass().getName().indexOf("lessons.");
		return this.getClass().getName().substring(index + "lessons.".length());
	}

	/**
	 * Gets the title attribute of the HelloScreen object
	 * 
	 * @return The title value
	 */
	public abstract String getTitle();

	/**
	 * Gets the content of lessonPlanURL
	 * 
	 * @param s
	 *            The user's WebSession
	 * 
	 * @return The HTML content of the current lesson plan
	 */
	public String getLessonPlan(WebSession s)
	{
		String src = null;

		try
		{
			// System.out.println("Loading lesson plan file: " +
			// getLessonPlanFileName());
			src = readFromFile(new BufferedReader(new FileReader(s.getWebResource(getLessonPlanFileName()))), false);

		} catch (Exception e)
		{
			// s.setMessage( "Could not find lesson plan for " +
			// getLessonName());
			src = ("Could not find lesson plan for: " + getLessonName());

		}
		return src;
	}

	/**
	 * Gets the ranking attribute of the Lesson object
	 * 
	 * @return The ranking value
	 */
	public Integer getRanking()
	{
		if (ranking != null)
		{
			return ranking;
		}
		else
		{
			return getDefaultRanking();
		}
	}

	/**
	 * Gets the hidden value of the Lesson Object
	 * 
	 * @return The hidden value
	 */
	public boolean getHidden()
	{
		return this.hidden;
	}

	/**
	 * Gets the role attribute of the AbstractLesson object
	 * 
	 * @return The role value
	 */
	public String getRole()
	{
		// 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.
		return USER_ROLE;
	}

	/**
	 * Gets the uniqueID attribute of the AbstractLesson object
	 * 
	 * @return The uniqueID value
	 */
	public int getScreenId()
	{
		return id.intValue();
	}

	public String getHtml_DELETE_ME(WebSession s)
	{
		String html = null;

		// FIXME: This doesn't work for the labs since they do not implement
		// createContent().
		String rawHtml = createContent(s).toString();
		// System.out.println("Getting raw html content: " +
		// rawHtml.substring(0, Math.min(rawHtml.length(), 100)));
		html = convertMetachars(AbstractLesson.readFromFile(new BufferedReader(new StringReader(rawHtml)), true));
		// System.out.println("Getting encoded html content: " +
		// html.substring(0, Math.min(html.length(), 100)));

		return html;
	}

	public String getSource(WebSession s)
	{
		String source = null;
		String src = null;

		try
		{
			// System.out.println("Loading source file: " +
			// getSourceFileName());
			src = convertMetacharsJavaCode(readFromFile(new BufferedReader(new FileReader(s
					.getWebResource(getSourceFileName()))), true));

			// TODO: For styled line numbers and better memory efficiency,
			// use a custom FilterReader
			// that performs the convertMetacharsJavaCode() transform plus
			// optionally adds a styled
			// line number. Wouldn't color syntax be great too?
		} catch (IOException e)
		{
			s.setMessage("Could not find source file");
			src = ("Could not find source file");
		}

		Html html = new Html();

		Head head = new Head();
		head.addElement(new Title(getSourceFileName()));

		Body body = new Body();
		body.addElement(new StringElement(src));

		html.addElement(head);
		html.addElement(body);

		source = html.toString();

		return source;
	}

	public String getSolution(WebSession s)
	{
		String src = null;

		try
		{
			System.out.println("Solution: " + getLessonSolutionFileName());
			src = readFromFile(new BufferedReader(new FileReader(s.getWebResource(getLessonSolutionFileName()))), false);
		} catch (IOException e)
		{
			s.setMessage("Could not find the solution file");
			src = ("Could not find the solution file");
		}

		Html html = new Html();

		Head head = new Head();
		head.addElement(new Title(getLessonSolutionFileName()));

		Body body = new Body();
		body.addElement(new StringElement(src));

		html.addElement(head);
		html.addElement(body);

		return src;
	}

	/**
	 * Get the link that can be used to request this screen.
	 * 
	 * @return
	 */
	public String getLink()
	{
		StringBuffer link = new StringBuffer();

		link.append("attack?");
		link.append(WebSession.SCREEN);
		link.append("=");
		link.append(getScreenId());
		link.append("&");
		link.append(WebSession.MENU);
		link.append("=");
		link.append(getCategory().getRanking());
		return link.toString();
	}

	/**
	 * Get the link to the jsp page used to render this screen.
	 * 
	 * @return
	 */
	public String getPage(WebSession s)
	{
		return null;
	}

	/**
	 * Get the link to the jsp template page used to render this screen.
	 * 
	 * @return
	 */
	public String getTemplatePage(WebSession s)
	{
		return null;
	}

	public abstract String getCurrentAction(WebSession s);

	public abstract void setCurrentAction(WebSession s, String lessonScreen);

	/**
	 * Override this method to implement accesss control in a lesson.
	 * 
	 * @param s
	 * @param functionId
	 * @return
	 */
	public boolean isAuthorized(WebSession s, int employeeId, String functionId)
	{
		return false;
	}

	/**
	 * Override this method to implement accesss control in a lesson.
	 * 
	 * @param s
	 * @param functionId
	 * @return
	 */
	public boolean isAuthorized(WebSession s, String role, String functionId)
	{
		boolean authorized = false;
		try
		{
			String query = "SELECT * FROM auth WHERE role = '" + role + "' and functionid = '" + functionId + "'";
			try
			{
				Statement answer_statement = WebSession.getConnection(s)
						.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
				ResultSet answer_results = answer_statement.executeQuery(query);
				authorized = answer_results.first();
			} catch (SQLException sqle)
			{
				s.setMessage("Error authorizing");
				sqle.printStackTrace();
			}
		} catch (Exception e)
		{
			s.setMessage("Error authorizing");
			e.printStackTrace();
		}
		return authorized;
	}

	public int getUserId(WebSession s) throws ParameterNotFoundException
	{
		return -1;
	}

	public String getUserName(WebSession s) throws ParameterNotFoundException
	{
		return null;
	}

	/**
	 * Description of the Method
	 * 
	 * @param windowName
	 *            Description of the Parameter
	 * @return Description of the Return Value
	 */
	public static String makeWindowScript(String windowName)
	{
		// FIXME: make this string static
		StringBuffer script = new StringBuffer();
		script.append("<script language=\"JavaScript\">\n");
		script.append("	<!--\n");
		script.append("	  function makeWindow(url) {\n");
		script.append("\n");
		script.append("	      agent = navigator.userAgent;\n");
		script.append("\n");
		script.append("	      params  = \"\";\n");
		script.append("	      params += \"toolbar=0,\";\n");
		script.append("	      params += \"location=0,\";\n");
		script.append("	      params += \"directories=0,\";\n");
		script.append("	      params += \"status=0,\";\n");
		script.append("	      params += \"menubar=0,\";\n");
		script.append("	      params += \"scrollbars=1,\";\n");
		script.append("	      params += \"resizable=1,\";\n");
		script.append("	      params += \"width=500,\";\n");
		script.append("	      params += \"height=350\";\n");
		script.append("\n");
		script.append("		  // close the window to vary the window size\n");
		script.append("	   	  if (typeof(win) == \"object\" && !win.closed){\n");
		script.append("            win.close();\n");
		script.append("	      }\n");
		script.append("\n");
		script.append("	      win = window.open(url, '" + windowName + "' , params);\n");
		script.append("\n");
		script.append(" 		  // bring the window to the front\n");
		script.append("		  win.focus();\n");
		script.append("	  }\n");
		script.append("	//-->\n");
		script.append("	</script>\n");

		return script.toString();
	}

	/**
	 * Simply reads a url into an Element for display. CAUTION: you might want to tinker with any
	 * non-https links (href)
	 * 
	 * @param url
	 *            Description of the Parameter
	 * @return Description of the Return Value
	 */
	public static Element readFromURL(String url)
	{
		ElementContainer ec = new ElementContainer();

		try
		{
			URL u = new URL(url);
			HttpURLConnection huc = (HttpURLConnection) u.openConnection();
			BufferedReader reader = new BufferedReader(new InputStreamReader(huc.getInputStream()));
			String line;

			while ((line = reader.readLine()) != null)
			{
				ec.addElement(new StringElement(line));
			}

			reader.close();
		} catch (Exception e)
		{
			System.out.println(e);
			e.printStackTrace();
		}

		return (ec);
	}

	/**
	 * Description of the Method
	 * 
	 * @param reader
	 *            Description of the Parameter
	 * @param numbers
	 *            Description of the Parameter
	 * @param methodName
	 *            Description of the Parameter
	 * @return Description of the Return Value
	 */
	public static Element readMethodFromFile(BufferedReader reader, String methodName, boolean numbers)
	{
		PRE pre = new PRE().addElement(getFileMethod(reader, methodName, numbers));

		return (pre);
	}

	/**
	 * Description of the Method
	 * 
	 * @param s
	 *            Description of the Parameter
	 */
	public void handleRequest(WebSession s)
	{
		// call createContent first so messages will go somewhere

		Form form = new Form(getFormAction(), Form.POST).setName("form").setEncType("");

		form.addElement(createContent(s));

		setContent(form);
	}

	public String getFormAction()
	{
		return getLink();
	}

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

	public String toString()
	{
		return getTitle();
	}

	public String getLessonPlanFileName()
	{
		return lessonPlanFileName;
	}

	public void setLessonPlanFileName(String lessonPlanFileName)
	{
		this.lessonPlanFileName = lessonPlanFileName;
	}

	public String getLessonSolutionFileName()
	{
		return lessonSolutionFileName;
	}

	public void setLessonSolutionFileName(String lessonSolutionFileName)
	{
		this.lessonSolutionFileName = lessonSolutionFileName;
	}

	public String getSourceFileName()
	{
		return sourceFileName;
	}

	public void setSourceFileName(String sourceFileName)
	{
		// System.out.println("Setting source file of lesson " + this + " to: "
		// + sourceFileName);
		this.sourceFileName = sourceFileName;
	}

	public WebgoatContext getWebgoatContext()
	{
		return webgoatContext;
	}

	public void setWebgoatContext(WebgoatContext webgoatContext)
	{
		this.webgoatContext = webgoatContext;
	}
}