/* this belongs to the WebRaveler package */
package webraveler.vurl;

import java.util.*;


import webraveler.http.HTTPRequest;
import webraveler.http.HTTPResponse;
import webraveler.ravel.Raveler;
import webraveler.ravel.RavelerException;
import webraveler.ravel.RavelerPlugin;
import webraveler.ravel.RavelerUser;

/**
 * Activates the given set of plugins
 * 
 * @author The Web Raveler Development Squad
 * @version 1.0
 */
public class PluginsActivated implements VURL {

	/**
	 *
	 */
	public PluginsActivated () {
		
	} // PluginSequenceVURL()
	
	/**
	 * Adds the specified plugins to the user's active plugins and updates the status of the plugins.    
	 * Returns a response indicating whether or not the operation was successful
	 */
	public HTTPResponse resolveVURL(String username, String query, HTTPRequest request,Raveler ravel) {
		/* Get the RavelerUser for the given username */
		RavelerUser user = new RavelerUser();
		String message = new String();
		try {
		    	user = ravel.getUser(username);
			/* Parse the query */
			/* First check if all the plugins should be activated */
			String allTest = null;
			if (query != null && !query.equals("")) 
				allTest = query.substring(0,3);
			if (allTest != null && allTest.equals("all")) {
				/* Determine whether to activate or deactivate all plugins */
				int start = query.indexOf("=");
				String deter = query.substring(start+1,query.length());
				if (deter.equals("on")) {
					/* Activate all the available plugins */
					for (Enumeration f = ravel.getPlugins(); f.hasMoreElements() ;) {
						RavelerPlugin plugin = (RavelerPlugin) f.nextElement();
						if (!user.activePlugins.contains(plugin.name) && !user.getStatus(plugin.name).equals("disabled")) {
							/* Add the plugin to the user's active plugins */
							user.addActivePlugin(plugin.name);
							/* Set the status of the plugin to active */
							user.setStatus(plugin.name,"active");	
						}  //if
					} //for
				} //if
				else {
					/* Deactivate all the currently activated plugins */
					if (!user.activePlugins.isEmpty()) {
						for (Enumeration f = user.activePlugins.elements(); f.hasMoreElements() ;) {
							String pluginName = (String) f.nextElement();
							/* Change the status of the plugin to inactive */
							user.setStatus(pluginName,"inactive");
						} //for
						/* Remove all the plugins from the user's active plugins */
						user.activePlugins.clear();
					} //if
				} //else
			} //if
			else {
				/* Activate only the specified plugins */
				int equalsIndex;
				int amperIndex=0;
				String pluginName;
				Vector modifiedPlugins = new Vector();
				Hashtable pref;
				while ((equalsIndex = query.indexOf('=',amperIndex)) != -1) {
					/* Check if we are past the first part, if so increment the
					* amperIndex so that we don't include the & in the pluginName */
					if (amperIndex != 0)
						amperIndex++;
					pluginName = query.substring(amperIndex,equalsIndex);
					/* Add the plugin to the newly active plugins vector */
					modifiedPlugins.add(pluginName);
					/* Change the status of the plugin to active in the preferences for the user */
					try {
					user.setStatus(pluginName,"active");
					} catch (RavelerException re) {
					message = "<p class='message'>"+re.getMessage()+"</p>";} 
					amperIndex = query.indexOf('&',equalsIndex);
					/* Check if we are at the last part, if so, stop */
					if (amperIndex == -1) 
						break;
				} //while
				/* Set the modified vector to the active plugins vector of the given user */
				user.activePlugins = modifiedPlugins;
				/* Set the status of all the other plugins to inactive */
				for (Enumeration f = ravel.getPlugins(); f.hasMoreElements();) {
					RavelerPlugin plugin = (RavelerPlugin) f.nextElement();
					if (!user.activePlugins.contains(plugin.name) && !user.getStatus(plugin.name).equals("disabled")) {
						/* Change the status of the plugin to inactive in the preferences for the user */
						user.setStatus(plugin.name,"inactive");
					} //if 
				} //for
			} //else
			message = "<p class='message'>The specified plugins were activated/deactivated</p>";
		} catch (RavelerException re) {
		    message = "<p class='message'>"+re.getMessage()+"</p>";
		} //catch
		/* Generate the response - include the user configuration page with note about plugins activated being changed */
		UserConfigVURL userConfig = new UserConfigVURL();
		userConfig.printMessage(message);
		HTTPResponse response = userConfig.resolveVURL(username,query,request,ravel);
		return response;
	} //resolveVURL
}