/*******************************************************************************
 * Copyright (c) 2003, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    IBM Corporation - Initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.internet.monitor.ui.internal;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.*;
import java.util.zip.GZIPInputStream;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.eclipse.wst.internet.monitor.core.internal.provisional.*;
import org.eclipse.wst.internet.monitor.ui.internal.view.MonitorView;
import org.osgi.framework.BundleContext;
/**
 * The TCP/IP monitor UI plugin.
 */
public class MonitorUIPlugin extends AbstractUIPlugin {
	public static final String PLUGIN_ID = "org.eclipse.wst.internet.monitor.ui";
	
	private static final byte[] BUFFER = new byte[4096];

	private static MonitorUIPlugin singleton;

	protected Map<String, ImageDescriptor> imageDescriptors = new HashMap<String, ImageDescriptor>();

	private static final String lineSeparator = System.getProperty("line.separator");

	private static URL ICON_BASE_URL;
	private static final String URL_CLCL = "clcl16/";
	private static final String URL_ELCL = "elcl16/";
	private static final String URL_DLCL = "dlcl16/";
	private static final String URL_OBJ = "obj16/";

	public static final String IMG_ELCL_SORT_RESPONSE_TIME = "IMG_ELCL_SORT_RESPONSE_TIME";
	public static final String IMG_ELCL_CLEAR = "IMG_ELCL_CLEAR";
	public static final String IMG_ELCL_HTTP_HEADER = "IMG_ELCL_HTTP_HEADER";
	public static final String IMG_CLCL_SORT_RESPONSE_TIME = "IMG_CLCL_SORT_RESPONSE_TIME";
	public static final String IMG_CLCL_CLEAR = "IMG_CLCL_CLEAR";
	public static final String IMG_CLCL_HTTP_HEADER = "IMG_CLCL_HTTP_HEADER";
	public static final String IMG_DLCL_SORT_RESPONSE_TIME = "IMG_DLCL_SORT_RESPONSE_TIME";
	public static final String IMG_DLCL_CLEAR = "IMG_DLCL_CLEAR";
	public static final String IMG_DLCL_HTTP_HEADER = "IMG_DLCL_HTTP_HEADER";

	public static final String IMG_REQUEST_RESPONSE = "requestResponse";
	public static final String IMG_RESEND_REQUEST_RESPONSE = "resendRequestResponse";

	public static final String IMG_HOST = "host";
	public static final String IMG_MONITOR_ON = "monitorOn";
	public static final String IMG_MONITOR_OFF = "monitorOff";

	private static final String SHOW_VIEW_ON_ACTIVITY = "show-view";
	private static final String SHOW_HEADER = "show-header";

	protected List<Request> requests = new ArrayList<Request>();

	protected IMonitorListener monitorListener = new IMonitorListener() {
		public void monitorAdded(IMonitor monitor) {
			monitor.addRequestListener(requestListener);
		}

		public void monitorChanged(IMonitor monitor) {
			// ignore
		}

		public void monitorRemoved(IMonitor monitor) {
			monitor.removeRequestListener(requestListener);
		}
	};

	protected IRequestListener requestListener = new IRequestListener() {
		public void requestAdded(IMonitor monitor, Request request) {
			addRequest(request);
			
			if (MonitorView.view != null)
				MonitorView.view.doRequestAdded(request);
			else if (MonitorUIPlugin.getShowOnActivityPreference())
				MonitorView.open(request);
		}

		public void requestChanged(IMonitor monitor, Request request) {
			if (MonitorView.view != null)
				MonitorView.view.doRequestChanged(request);
		}
	};

	/**
	 * MonitorUIPlugin constructor comment.
	 */
	public MonitorUIPlugin() {
		super();
		singleton = this;
	}

	/**
	 * Creates and pre-loads the image registry.
	 * 
	 * @return ImageRegistry
	 */
	protected ImageRegistry createImageRegistry() {
		ImageRegistry registry = super.createImageRegistry();

		registerImage(registry, IMG_REQUEST_RESPONSE, URL_OBJ + "tcp.gif");
		registerImage(registry, IMG_RESEND_REQUEST_RESPONSE, URL_ELCL + "resendRequest.gif");
		
		registerImage(registry, IMG_HOST, URL_OBJ + "host.gif");
		registerImage(registry, IMG_MONITOR_ON, URL_OBJ + "monitorOn.gif");
		registerImage(registry, IMG_MONITOR_OFF, URL_OBJ + "monitorOff.gif");

		registerImage(registry, IMG_CLCL_CLEAR, URL_CLCL + "clear.gif");
		registerImage(registry, IMG_CLCL_SORT_RESPONSE_TIME, URL_CLCL + "sortResponseTime.gif");
		registerImage(registry, IMG_CLCL_HTTP_HEADER, URL_CLCL + "httpHeader.gif");

		registerImage(registry, IMG_ELCL_CLEAR, URL_ELCL + "clear.gif");
		registerImage(registry, IMG_ELCL_SORT_RESPONSE_TIME, URL_ELCL + "sortResponseTime.gif");
		registerImage(registry, IMG_ELCL_HTTP_HEADER, URL_ELCL + "httpHeader.gif");

		registerImage(registry, IMG_DLCL_CLEAR, URL_DLCL + "clear.gif");
		registerImage(registry, IMG_DLCL_SORT_RESPONSE_TIME, URL_DLCL + "sortResponseTime.gif");
		registerImage(registry, IMG_DLCL_HTTP_HEADER, URL_DLCL + "httpHeader.gif");

		return registry;
	}

	/**
	 * Return the image with the given key from the image registry.
	 * 
	 * @param key the key
	 * @return the image
	 */
	public static Image getImage(String key) {
		return getInstance().getImageRegistry().get(key);
	}

	/**
	 * Return the image with the given key from the image registry.
	 * 
	 * @param key the key
	 * @return an image descriptor
	 */
	public static ImageDescriptor getImageDescriptor(String key) {
		try {
			getInstance().getImageRegistry();
			return getInstance().imageDescriptors.get(key);
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * Returns the singleton instance of this plugin.
	 * 
	 * @return the plugin
	 */
	public static MonitorUIPlugin getInstance() {
		return singleton;
	}

	/**
	 * Register an image with the registry.
	 * 
	 * @param key the key
	 * @param partialURL
	 */
	private void registerImage(ImageRegistry registry, String key, String partialURL) {
		if (ICON_BASE_URL == null) {
			String pathSuffix = "icons/";
			ICON_BASE_URL = singleton.getBundle().getEntry(pathSuffix);
		}

		try {
			ImageDescriptor id = ImageDescriptor.createFromURL(new URL(ICON_BASE_URL, partialURL));
			registry.put(key, id);
			imageDescriptors.put(key, id);
		} catch (Exception e) {
			Trace.trace(Trace.SEVERE, "Error registering image", e);
		}
	}

	/**
	 * @see AbstractUIPlugin#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);

		getPreferenceStore().setDefault(MonitorUIPlugin.SHOW_VIEW_ON_ACTIVITY, true);
		
		MonitorCore.addMonitorListener(monitorListener);
		
		IMonitor[] monitors = MonitorCore.getMonitors();
		if (monitors != null) {
			for (IMonitor monitor : monitors)
				monitor.addRequestListener(requestListener);
		}
	}

	/**
	 * @see AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {
		super.stop(context);
		
		IMonitor[] monitors = MonitorCore.getMonitors();
		if (monitors != null) {
			for (IMonitor monitor : monitors)
				monitor.removeRequestListener(requestListener);
		}
		
		MonitorCore.removeMonitorListener(monitorListener);
	}

	public static boolean getDefaultShowOnActivityPreference() {
		return getInstance().getPreferenceStore().getDefaultBoolean(SHOW_VIEW_ON_ACTIVITY);
	}

	public static boolean getShowOnActivityPreference() {
		return getInstance().getPreferenceStore().getBoolean(SHOW_VIEW_ON_ACTIVITY);
	}

	public static void setShowOnActivityPreference(boolean b) {
		getInstance().getPreferenceStore().setValue(SHOW_VIEW_ON_ACTIVITY, b);
		getInstance().savePluginPreferences();
	}

	public static boolean getShowHeaderPreference() {
		return getInstance().getPreferenceStore().getBoolean(SHOW_HEADER);
	}

	public static void setShowHeaderPreference(boolean b) {
		getInstance().getPreferenceStore().setValue(SHOW_HEADER, b);
		getInstance().savePluginPreferences();
	}

	/**
	 * Convenience method to unzip the given bytes using gzip. The returned byte
	 * array is either the unzipped results, or the original byte array if unzipping
	 * was not successful. The byte array must not be null.
	 * 
	 * @param b a byte array
	 * @return the unzipped array, or the original array if unsuccessful
	 */
	public static synchronized byte[] unzip(byte[] b) {
		if (b == null)
			throw new IllegalArgumentException();
		
		try {
			GZIPInputStream gin = new GZIPInputStream(new ByteArrayInputStream(b));
			byte[] t = new byte[0];
			while (gin.available() > 0) {
				int n = gin.read(BUFFER);
				if (n > 0) {
					byte[] temp = new byte[t.length + n];
					System.arraycopy(t, 0, temp, 0, t.length);
					System.arraycopy(BUFFER, 0, temp, t.length, n);
					t = temp;
				}
			}
			return t;
		} catch (Exception e) {
			Trace.trace(Trace.FINEST, "Could not unzip byte array");
			return b;
		}
	}

	/**
	 * Convenience method to parse the given bytes into String form. The bytes
	 * are parsed into a line delimited string. The byte array must not be null.
	 * 
	 * @param b a byte array
	 * @return the string after the conversion
	 */
	public static String parse(byte[] b) {
		if (b == null)
			throw new IllegalArgumentException();
		
		ByteArrayInputStream bin = new ByteArrayInputStream(b);
		BufferedReader br = new BufferedReader(new InputStreamReader(bin));
		StringBuffer sb = new StringBuffer();
		try {
			String s = br.readLine();
			
			while (s != null) {
				sb.append(s);
				s = br.readLine();
				if (s != null)
					sb.append(lineSeparator);
			}
		} catch (Exception e) {
			Trace.trace(Trace.SEVERE, "Error parsing input", e);
		}
		
		return sb.toString();
	}

	public void addRequest(Request request) {
		if (!requests.contains(request))
			requests.add(request);
	}

	/**
	 * Returns a list of the current requests.
	 *
	 * @return an array of requests
	 */
	public Request[] getRequests() {
		Request[] r = new Request[requests.size()];
		requests.toArray(r);
		return r;
	}
	
	public void clearRequests() {
		requests = new ArrayList<Request>();
	}
}