/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.carbide.remoteconnections.internal.ui;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

import org.eclipse.jface.layout.GridDataFactory;

import org.eclipse.jface.layout.GridLayoutFactory;

import org.eclipse.swt.SWT;

import org.eclipse.swt.custom.CLabel;

import org.eclipse.swt.events.MouseAdapter;

import org.eclipse.swt.events.MouseEvent;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Point;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Menu;

import org.eclipse.swt.widgets.MenuItem;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.swt.widgets.ToolBar;

import org.eclipse.swt.widgets.ToolItem;

import org.eclipse.swt.widgets.ToolTip;

import org.eclipse.ui.IWorkbench;

import org.eclipse.ui.IWorkbenchWindow;

import org.eclipse.ui.PartInitException;

import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.menus.CommandContributionItem;

import org.eclipse.ui.menus.WorkbenchWindowControlContribution;

import com.nokia.carbide.remoteconnections.Messages;

import com.nokia.carbide.remoteconnections.RemoteConnectionsActivator;

import com.nokia.carbide.remoteconnections.interfaces.IConnection;

import com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager;

import com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionListener;

import com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionsManagerListener;

import com.nokia.carbide.remoteconnections.internal.api.IConnection2;

import com.nokia.carbide.remoteconnections.internal.api.IConnection2.IConnectionStatus;

import com.nokia.carbide.remoteconnections.internal.api.IConnection2.IConnectionStatusChangedListener;

import com.nokia.carbide.remoteconnections.internal.registry.Registry;

import com.nokia.carbide.remoteconnections.view.ConnectionsView;

import com.nokia.cpp.internal.api.utils.core.TextUtils;

import com.nokia.cpp.internal.api.utils.ui.WorkbenchUtils;

/**

 * This widget appears in the Eclipse trim and allows the user to select the

 * "default" device connection and also see its status at a glance.

 * <p>

 * Note: the UI for this control should behave similarly to that of the News Reader

 * trim.  Due to the way we're modifying the icon and the state dynamically

 * for this contribution, they can't be implemented the same way, however.

 */

@SuppressWarnings("deprecation")

public class ConnectionStatusSelectorContribution extends WorkbenchWindowControlContribution {

	/**

	 * This is the id on the command in the toolbar contribution associated with this 

	 * widget.  Keep this in sync with the extension point!

	 */

	private static final String OPEN_REMOTE_CONNECTIONS_VIEW_COMMAND_ID = "openRemoteConnectionsView";

	private Composite container;

	private CLabel connectionInfo;

	private ToolItem connectionIcon;

	private IConnectionsManager manager;

	private IConnection defaultConnection;

	private ListenerBlock listenerBlock;

	private ToolTip tooltip;

	private MouseAdapter toolbarListener;

	private ToolBar toolbar;

	/**

	 * Contains all the listeners.  In most cases we just recreate the contribution status item.

	 */

		/* (non-Javadoc)

		 * @see com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionListener#connectionAdded(com.nokia.carbide.remoteconnections.interfaces.IConnection)

		 */

		public void connectionAdded(IConnection connection) {

			updateUI();

			boolean display = (connection instanceof IConnection2 && ((IConnection2) connection).isDynamic());

			if (display)

				launchBubble(MessageFormat.format(

						Messages.getString("ConnectionStatusSelectorContribution.AddedConnectionFormat"),  //$NON-NLS-1$

						connection.getDisplayName()));

		}

		/* (non-Javadoc)

		 * @see com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionListener#connectionRemoved(com.nokia.carbide.remoteconnections.interfaces.IConnection)

		 */

		public void connectionRemoved(IConnection connection) {

			updateUI();

			boolean display = (connection instanceof IConnection2 && ((IConnection2) connection).isDynamic());

			if (display) 

				launchBubble(MessageFormat.format(

						Messages.getString("ConnectionStatusSelectorContribution.RemovedConnectionFormat"),  //$NON-NLS-1$

						connection.getDisplayName()));

		}

		/* (non-Javadoc)

		 * @see com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionListener#defaultConnectionSet(com.nokia.carbide.remoteconnections.interfaces.IConnection)

		 */

		public void defaultConnectionSet(IConnection connection) {

			updateUI();

		}

		/* (non-Javadoc)

		 * @see com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionsManagerListener#connectionStoreChanged()

		 */

		public void connectionStoreChanged() {

			updateUI();

		}

		/* (non-Javadoc)

		 * @see com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionsManagerListener#displayChanged()

		 */

		public void displayChanged() {

			updateUI();

		}

		/* (non-Javadoc)

		 * @see com.nokia.carbide.remoteconnections.internal.api.IConnection2.IConnectionStatusChangedListener#statusChanged(com.nokia.carbide.remoteconnections.internal.api.IConnection2.IConnectionStatus)

		 */

		public void statusChanged(IConnectionStatus status) {

			updateConnectionStatus(status);

		}

	}

	public ConnectionStatusSelectorContribution() {

		manager = RemoteConnectionsActivator.getConnectionsManager();

		listenerBlock = new ListenerBlock();

	}

	/*

	 * (non-Javadoc)

	 * @see org.eclipse.jface.action.ControlContribution#createControl(org.eclipse.swt.widgets.Composite)

	 */

	@Override

	protected Control createControl(Composite parent) {

		// This UI is recreated whenever the default connection changes.

		// This is gross.  The normal parent of this is a toolbar,

		// but we cannot add arbitrary stuff to the toolbar besides

		// this control.  (If you try, it will usually show up

		// out of order!)

		//

		// But we want to have a toolbar button for the connection icon

		// for which we can change the tooltip and image, and attach 

		// a mouse listener responds to left and right clicking.

		//

		// In order to do this, we need to poke around in the widget tree

		// to find the expected Eclipse-generated toolitem.  Unfortunately,

		// controlling all this ourselves is even uglier (I tried).

		if (parent instanceof ToolBar) {

			toolbar = (ToolBar) parent;

			ToolItem[] items = toolbar.getItems();

			for (ToolItem item : items) {

				Object data = item.getData();

				if (data instanceof CommandContributionItem &&

						((CommandContributionItem) data).getId().contains(OPEN_REMOTE_CONNECTIONS_VIEW_COMMAND_ID)) {

					connectionIcon = item;

					break;

				}

			}

		} else {

			toolbar = null;

		}

		container = new Composite(parent, SWT.NONE);

		GridLayoutFactory.fillDefaults().margins(2, 0).applyTo(container);

		// Create a label for the trim, outside the toolbar.

		connectionInfo = new CLabel(container, SWT.NONE);

		GridDataFactory.fillDefaults().grab(false, true).applyTo(connectionInfo);

		String text = Messages.getString("ConnectionStatusSelectorContribution_NoDefaultConnectionMessage"); //$NON-NLS-1$

		defaultConnection = manager.getDefaultConnection();

		if (defaultConnection != null)

			text = defaultConnection.getDisplayName();

		connectionInfo.setText(text);

		attachListeners();

		updateConnectionStatus(getConnectionStatus(defaultConnection));

		// Yuck, toolbars and items have a wonky UI.  We need to do these events on the parent,

		// since the ToolItem itself is just an area inside the parent.  (#getControl() is only for separators ?!)

		// On icon: left click = open view, right click = menu

		if (toolbar != null) {

			if (toolbarListener != null)

				toolbar.removeMouseListener(toolbarListener);

			toolbarListener = new MouseAdapter() {

				/* (non-Javadoc)

				 * @see org.eclipse.swt.events.MouseAdapter#mouseDown(org.eclipse.swt.events.MouseEvent)

				 */

				@Override

				public void mouseDown(MouseEvent event) {

					ToolItem item = toolbar.getItem(new Point(event.x, event.y));

					if (item == connectionIcon) {

						if (event.button == 1) {

							openConnectionsView();

						} else if (event.button == 3) {

							Point screenLoc = toolbar.toDisplay(event.x, event.y);

							handleConnectionMenu(screenLoc);

						}

					}

				}

			};

			toolbar.addMouseListener(toolbarListener);

			// On label: left or right click = menu

			connectionInfo.addMouseListener(new MouseAdapter() {

				public void mouseDown(MouseEvent event) {

					if (event.button == 1 || event.button == 3) {

						Point screenLoc = toolbar.toDisplay(event.x, event.y);

						handleConnectionMenu(screenLoc);

					}

				}

			});

		}

		RemoteConnectionsActivator.setHelp(container, "ConnectionStatusSelector"); //$NON-NLS-1$

		return container;

	}

	private void handleConnectionMenu(Point screenLoc) {

		Shell shell = connectionInfo.getParent().getShell();

		final Display display = shell.getDisplay();

		final Menu menu = new Menu(shell, SWT.POP_UP);

		populateConnectionMenu(menu);

		menu.setLocation(screenLoc.x, screenLoc.y);

		menu.setVisible(true);

		while (!menu.isDisposed() && menu.isVisible()) {

			if (!display.readAndDispatch())

				display.sleep();

		}

		menu.dispose();

	}

	/**

	 * @return

	 */

	protected void populateConnectionMenu(Menu menu) {

		// Display the connections with dynamic ones first, 

		// then static ones, separated by a separator

		List<IConnection> dynamicConnections = new ArrayList<IConnection>();

		List<IConnection> staticConnections = new ArrayList<IConnection>();

		for (IConnection connection : RemoteConnectionsActivator.getConnectionsManager().getConnections()) {

			if (connection instanceof IConnection2 && ((IConnection2)connection).isDynamic()) 

				dynamicConnections.add(connection);

			else

				staticConnections.add(connection);

		}

		Comparator<IConnection> connectionComparator = new Comparator<IConnection>() {

			public int compare(IConnection o1, IConnection o2) {

				return o1.getDisplayName().compareToIgnoreCase(o2.getDisplayName());

			}

		};

		Collections.sort(dynamicConnections, connectionComparator);

		Collections.sort(staticConnections, connectionComparator);

		MenuItem label = new MenuItem(menu, SWT.NONE);

		label.setEnabled(false);

		int number = 1;

		if (dynamicConnections.size() + staticConnections.size() == 0) {

			label.setText(Messages.getString("ConnectionStatusSelectorContribution.NoConnectionsDefinedOrDetected")); //$NON-NLS-1$

		} else {

			label.setText(Messages.getString("ConnectionStatusSelectorContribution_SelectTheDefaultConnectionMessage")); //$NON-NLS-1$

			for (IConnection connection : dynamicConnections) {

				createConnectionMenuItem(menu, connection, defaultConnection, number++);

			}

			for (IConnection connection : staticConnections) {

				createConnectionMenuItem(menu, connection, defaultConnection, number++);

			}

		}

		new MenuItem(menu, SWT.SEPARATOR);

		MenuItem openView = new MenuItem(menu, SWT.PUSH);

		openView.setText(Messages.getString("ConnectionStatusSelectorContribution.OpenRemoteConnectionsView")); //$NON-NLS-1$

		openView.addSelectionListener(new SelectionAdapter() {

			@Override

			public void widgetSelected(SelectionEvent e) {

				openConnectionsView();

			}

		});

	}

	/**

	 * @param menu

	 * @param connection

	 * @param defaultConnection 

	 */

	private MenuItem createConnectionMenuItem(Menu menu, 

			final IConnection connection, 

			IConnection defaultConnection,

			int number) {

		MenuItem item = new MenuItem(menu, SWT.CHECK);

		boolean isDefault = false;

		isDefault = connection.equals(defaultConnection);

		item.setSelection(isDefault);

		item.setText(MessageFormat.format("&{0} - {1}", number, connection.getDisplayName())); //$NON-NLS-1$

		item.addSelectionListener(new SelectionAdapter() {

			@Override

			public void widgetSelected(SelectionEvent e) {

				manager.setDefaultConnection(connection);

			}

		});		

		return item;

	}

	private void attachListeners() {

		manager.addConnectionListener(listenerBlock);

		Registry.instance().addConnectionStoreChangedListener(listenerBlock);

		if (defaultConnection != null) {

			if (defaultConnection instanceof IConnection2) {

				((IConnection2) defaultConnection).addStatusChangedListener(listenerBlock);

			}

		}

	}

	private void removeListeners() {

		if (defaultConnection != null) {

			if (defaultConnection instanceof IConnection2) {

				((IConnection2) defaultConnection).removeStatusChangedListener(listenerBlock);

			}

		}

		manager.removeConnectionListener(listenerBlock);

		Registry.instance().removeConnectionStoreChangedListener(listenerBlock);

	}

	/*

	 * (non-Javadoc)

	 * @see org.eclipse.jface.action.ContributionItem#dispose()

	 */

	public void dispose() {

		removeListeners();

		if (connectionIcon != null)

			connectionIcon.dispose();

		if (toolbarListener != null && !toolbar.isDisposed())

			toolbar.removeMouseListener(toolbarListener);

		if (connectionInfo != null)

			connectionInfo.dispose();

		super.dispose();

	}

	/**

	 * @param ev

	 */

	protected void openConnectionsView() {

		try {

			WorkbenchUtils.getView(ConnectionsView.VIEW_ID);

        } 

        catch (PartInitException e) {

        	RemoteConnectionsActivator.logError(e);

        }

	}

	/**

	 * @param defaultConnection

	 * @param status

	 * @return

	 */

	private String createConnectionStatusTooltip(IConnection defaultConnection,

			IConnectionStatus status) {

		if (defaultConnection == null) {

			return Messages.getString("ConnectionStatusSelectorContribution.NoDynamicOrManualConnectionsTooltip"); //$NON-NLS-1$

		}

		String statusString = null;

		if (status != null) {

		}

		if (TextUtils.isEmpty(statusString)) {

			// fallback string; the status should not be empty

			if (ConnectionUIUtils.isSomeServiceInUse(defaultConnection))

				statusString = Messages.getString("ConnectionStatusSelectorContribution.InUse"); //$NON-NLS-1$

			else

				statusString = Messages.getString("ConnectionStatusSelectorContribution.NotInUse"); //$NON-NLS-1$

		}

		return MessageFormat.format(Messages.getString("ConnectionStatusSelectorContribution.ConnectionStatusFormat"), defaultConnection.getDisplayName(), statusString); //$NON-NLS-1$

	}

	/**

	 * Get the image representing the connection status.

	 * @param connection

	 * @return Image, to be disposed

	 */

	private IConnectionStatus getConnectionStatus(IConnection connection) {

		if (!(connection instanceof IConnection2)) {

			return null;

		} else {

			return ((IConnection2) connection).getStatus();

		}

	}

	/**

	 * @param status

	 */

	private void updateConnectionStatus(final IConnectionStatus status) {

		Display.getDefault().asyncExec(new Runnable() {

			public void run() {

				if (connectionIcon == null || connectionIcon.isDisposed())

					return;

				Image statusImage;

				if (status != null)

					statusImage = ConnectionUIUtils.getConnectionStatusImage(status);

				else

					statusImage = ConnectionUIUtils.getConnectionImage(defaultConnection);

				connectionIcon.setImage(statusImage);

				String tip = createConnectionStatusTooltip(defaultConnection, status);

				connectionInfo.setToolTipText(tip);

				String preamble = Messages.getString("ConnectionStatusSelectorContribution.IconTooltipPrefixMessage"); //$NON-NLS-1$

				connectionIcon.setToolTipText(preamble + tip);		

			}

		});

	}

	/**

	 * 

	 */

	private void updateUI() {

		// perform update in UI thread

		final IWorkbench workbench = PlatformUI.getWorkbench();

		workbench.getDisplay().asyncExec(new Runnable() {

			public void run() {

				IWorkbenchWindow window = workbench.getActiveWorkbenchWindow();

				if (window != null) {

					update();

				}

			}

		});		

	}