/*

* Copyright (c) 2008 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 com.nokia.carbide.remoteconnections.Messages;

import com.nokia.carbide.remoteconnections.RemoteConnectionsActivator;

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

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

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

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

import com.nokia.carbide.remoteconnections.settings.ui.SettingsWizard;

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

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

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Status;

import org.eclipse.jface.dialogs.Dialog;

import org.eclipse.jface.dialogs.IDialogConstants;

import org.eclipse.jface.resource.JFaceResources;

import org.eclipse.jface.viewers.*;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.DisposeEvent;

import org.eclipse.swt.events.DisposeListener;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.graphics.*;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.*;

import java.text.MessageFormat;

import java.util.*;

import java.util.List;

/**

 * Implementation of IClientServiceSiteUI2

 */

@SuppressWarnings("deprecation")

public class ClientServiceSiteUI2 implements IClientServiceSiteUI2, IConnectionListener, IConnectionsManagerListener {

	private IService service;

	private ComboViewer viewer;

	private FontMetrics fm;

	private Set<IConnectionType> compatibleConnectionTypes;

	private Button editButton;

	private Button newButton;

	private String connection;

	private ListenerList<IListener> listenerList;

	private static final String UID = ".uid"; //$NON-NLS-1$

	private Map<String, String> connectionNames;

	public ClientServiceSiteUI2(IService service) {

		Check.checkArg(service);

		this.service = service;

	}

	public void createComposite(Composite parent) {

		initializeDialogUnits(parent);

		Group group = new Group(parent, SWT.NONE);

		group.setText(Messages.getString("ClientServiceSiteUI2.UseConnectionGroupLabel")); //$NON-NLS-1$

		group.setLayout(new GridLayout());

		group.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));

		group.setData(UID, "useConnectionGroup"); //$NON-NLS-1$

		viewer = new ComboViewer(group, SWT.READ_ONLY);

		viewer.setLabelProvider(new LabelProvider() {

			@Override

			public String getText(Object element) {

				Check.checkContract(element instanceof String);

				String id = (String) element;

				return connectionNames.get(id);

			}

		});

		viewer.setContentProvider(new ArrayContentProvider());

		GridData gd = new GridData(SWT.FILL, SWT.CENTER, true, false);

		viewer.getCombo().setLayoutData(gd);

		viewer.getControl().setData(UID, "viewer"); //$NON-NLS-1$

		viewer.addSelectionChangedListener(new ISelectionChangedListener() {

			public void selectionChanged(SelectionChangedEvent event) {

				IStructuredSelection selection = (IStructuredSelection) event.getSelection();

				String connection = (String) selection.getFirstElement();

				if (connection != null && !connection.equals(ClientServiceSiteUI2.this.connection)) {

					ClientServiceSiteUI2.this.connection = connection;

					fireConnectionSelected();

				}

			}

		});

		final Composite composite = new Composite(group, SWT.NONE);

		GridLayout layout = new GridLayout();

		layout.numColumns = 2;

		layout.makeColumnsEqualWidth = true;

		layout.marginWidth = Dialog.convertHorizontalDLUsToPixels(fm, IDialogConstants.HORIZONTAL_MARGIN);

		layout.marginHeight = Dialog.convertVerticalDLUsToPixels(fm, IDialogConstants.VERTICAL_MARGIN);

		layout.horizontalSpacing = Dialog.convertHorizontalDLUsToPixels(fm, IDialogConstants.HORIZONTAL_SPACING);

		layout.verticalSpacing = Dialog.convertVerticalDLUsToPixels(fm, IDialogConstants.VERTICAL_SPACING);

		composite.setLayout(layout);

		gd = new GridData(GridData.HORIZONTAL_ALIGN_END | GridData.VERTICAL_ALIGN_CENTER);

		composite.setLayoutData(gd);

		composite.setFont(parent.getFont());

		newButton = new Button(composite, SWT.PUSH);

		newButton.setText(Messages.getString("ClientServiceSiteUI2.NewButtonLabel")); //$NON-NLS-1$

		newButton.setFont(JFaceResources.getDialogFont());

		gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL);

		int widthHint = Dialog.convertHorizontalDLUsToPixels(fm, IDialogConstants.BUTTON_WIDTH);

		Point minSize = newButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);

		gd.widthHint = Math.max(widthHint, minSize.x);

		newButton.setLayoutData(gd);

		newButton.setData(UID, "newButton"); //$NON-NLS-1$

		newButton.addSelectionListener(new SelectionAdapter() {

			@Override

			public void widgetSelected(SelectionEvent e) {

				SettingsWizard wizard = new SettingsWizard(null, service);

				wizard.open(composite.getShell());

				IConnection connection = wizard.getConnectionToEdit();

				// note: refresh ASAP so the selection will be valid; but endure a listener event

				// which will redo this

				refreshUI();

				setViewerInput(connection);

			}

		});

		editButton = new Button(composite, SWT.PUSH);

		editButton.setText(Messages.getString("ClientServiceSiteUI2.EditButtonLabel")); //$NON-NLS-1$

		editButton.setFont(JFaceResources.getDialogFont());

		gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL);

		widthHint = Dialog.convertHorizontalDLUsToPixels(fm, IDialogConstants.BUTTON_WIDTH);

		minSize = editButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);

		gd.widthHint = Math.max(widthHint, minSize.x);

		editButton.setLayoutData(gd);

		editButton.setData(UID, "editButton"); //$NON-NLS-1$

		editButton.addSelectionListener(new SelectionAdapter() {

			@Override

			public void widgetSelected(SelectionEvent e) {

				IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();

				Object value = selection.getFirstElement();

				if (value instanceof String) {

					IConnection editConnection = getActualConnection((String) value);

					SettingsWizard wizard = new SettingsWizard(editConnection, service);

					wizard.open(composite.getShell());

					// leave the viewer the same, callback will refresh anything needed

				}

			}

		});

		// attach listeners

		RemoteConnectionsActivator.getConnectionsManager().addConnectionListener(this);

		RemoteConnectionsActivator.getConnectionsManager().addConnectionStoreChangedListener(this);

		// remove listeners on dispose

		group.addDisposeListener(new DisposeListener() {

			public void widgetDisposed(DisposeEvent e) {

				RemoteConnectionsActivator.getConnectionsManager().removeConnectionListener(ClientServiceSiteUI2.this);

				RemoteConnectionsActivator.getConnectionsManager().removeConnectionStoreChangedListener(ClientServiceSiteUI2.this);

			}

		});

		setViewerInput(null);

	}

	/**

	 * Get the actual connection for an identifier.

	 * This is not {@link IConnectionsManager#ensureConnection(String, IService)} because we don't

	 * want to actually validate the connection now.

	 * @param id

	 * @return {@link IConnection} or <code>null</code>

	 */

	protected IConnection getActualConnection(String id) {

		if (id == null) {

			return null;

		}

		if (id.equals(Registry.CURRENT_CONNECTION_ID)) {

			return RemoteConnectionsActivator.getConnectionsManager().getCurrentConnection();

		}

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

			if (connection.getIdentifier().equals(id)) {

				return connection;

			}

		}

		return null;

	}

	/**

	 * Set the selected input.  

	 * @param connection existing connection or <code>null</code> for the current   

	 */

	private void setViewerInput(IConnection connection) {

		List<IConnection> compatible = getCompatibleConnections();

		connectionNames = new LinkedHashMap<String, String>();

		// update the current

		IConnection currentConnection = RemoteConnectionsActivator.getConnectionsManager().getCurrentConnection();

		connectionNames.put(Registry.CURRENT_CONNECTION_ID, createCurrentConnectionName(currentConnection));

		for (IConnection conn : compatible) {

			connectionNames.put(conn.getIdentifier(), conn.getDisplayName());

		}

		viewer.setInput(connectionNames.keySet());

		if (connectionNames.isEmpty())

			viewer.getCombo().setEnabled(false);

		else {

			viewer.getCombo().setEnabled(true);

			if (connection == null) {

				String lastConnectionId = Registry.instance().getLastConnectionId();

				if (lastConnectionId != null) {

				} else {

					viewer.getCombo().select(0);

					viewer.setSelection(viewer.getSelection());

				}

			}

			else

				selectConnection(connection.getIdentifier());

		}

		editButton.setEnabled(!viewer.getSelection().isEmpty());

		// fire listener in case we selected anew or the current connection changed

		fireConnectionSelected();

	}

	private void refreshUI() {

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

			public void run() {

				if (viewer != null && viewer.getContentProvider() != null) {

					// try to preserve the currently selected item, if it's a concrete

					// connection; if it's current, allow for the new current to be chosen.

					IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();

					Object value = selection.getFirstElement();

					String current = null;

					if (value instanceof String) {

						current = (String) value;

					}

					if (Registry.CURRENT_CONNECTION_ID.equals(current)) {

						current = null;

					}

					setViewerInput(getActualConnection(current));

				}

			}

		});

	}

	/**

	 * @param currentConnection

	 * @return

	 */

	private String createCurrentConnectionName(IConnection currentConnection) {

		return MessageFormat.format(Messages.getString("ClientServiceSiteUI2.CurrentConnectionFormat"), //$NON-NLS-1$

				currentConnection != null ? currentConnection.getDisplayName() : 

					Messages.getString("ClientServiceSiteUI2.CurrentConnection_NoneDetected")); //$NON-NLS-1$

	}

	private void initializeDialogUnits(Composite parent) {

		GC gc = new GC(parent);

		gc.setFont(JFaceResources.getDialogFont());

		fm = gc.getFontMetrics();

		gc.dispose();

	}

	private List<IConnection> getCompatibleConnections() {

		getCompatibleConnectionTypes();

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

		for (IConnection connection : Registry.instance().getConnections()) {

			if (isCompatibleConnection(connection))

				compatibleConnections.add(connection);

		}

		return compatibleConnections;

	}

	private boolean isCompatibleConnection(IConnection connection) {

		return compatibleConnectionTypes.contains(connection.getConnectionType());

	}

	private void getCompatibleConnectionTypes() {

		compatibleConnectionTypes = new HashSet<IConnectionType>();

		Collection<String> compatibleTypeIds =

			Registry.instance().getCompatibleConnectionTypeIds(service);

		for (String typeId : compatibleTypeIds) {

			compatibleConnectionTypes.add(

					Registry.instance().getConnectionType(typeId));

		}

	}

	public void selectConnection(String connection) {

		viewer.setSelection(new StructuredSelection(connection));

	}

	public String getSelectedConnection() {

		Registry.instance().setLastConnectionId(connection);

		return connection;

	}

	public IStatus getSelectionStatus() {

		String requiredConnectionTypes = getAllowedConnectionTypesString();

		// no selection yet...?

		if (connection == null) {

			return new Status(IStatus.ERROR, RemoteConnectionsActivator.PLUGIN_ID,

					MessageFormat.format(

							Messages.getString("ClientServiceSiteUI2.NoConnectionError"), //$NON-NLS-1$

							service.getDisplayName(),

							requiredConnectionTypes));

		}

		// check whether the current is compatible with the service and connection type

		if (Registry.CURRENT_CONNECTION_ID.equals(connection)) {

			IConnection actual = getActualConnection(connection);

			if (actual == null) {

				return new Status(IStatus.ERROR, RemoteConnectionsActivator.PLUGIN_ID,

						MessageFormat.format(

							Messages.getString("ClientServiceSiteUI2.NoCurrentConnection"), //$NON-NLS-1$

							service.getDisplayName(),

							requiredConnectionTypes));

			}

			// is the service supported?

			boolean found = false;

			for (IConnectedService aService : Registry.instance().getConnectedServices(actual)) {

				if (service.getIdentifier().equals(aService.getService().getIdentifier())) {

					found = true;

					break;

				}

			}

			if (!found) {

				return new Status(IStatus.WARNING, RemoteConnectionsActivator.PLUGIN_ID,

						MessageFormat.format(

								Messages.getString("ClientServiceSiteUI2.IncompatibleCurrentConnectionService") //$NON-NLS-1$

								+ "\n"  //$NON-NLS-1$

								+ Messages.getString("ClientServiceSiteUI2.IncompatibleCurrentConnectionFixupAdvice"), //$NON-NLS-1$

								actual.getDisplayName(),

								service.getDisplayName()));

			}

			// is the hardware type supported by the service?

			if (!isCompatibleConnection(actual)) {

				return new Status(IStatus.WARNING, RemoteConnectionsActivator.PLUGIN_ID,

						MessageFormat.format(

								Messages.getString("ClientServiceSiteUI2.IncompatibleCurrentConnectionType") //$NON-NLS-1$

								+ "\n"  //$NON-NLS-1$

								+ Messages.getString("ClientServiceSiteUI2.IncompatibleCurrentConnectionFixupAdvice"), //$NON-NLS-1$

								actual.getDisplayName(),

								requiredConnectionTypes));

			}

		}

		// otherwise, it's okay!

		return Status.OK_STATUS;

	}

	private String getAllowedConnectionTypesString() {

		StringBuilder requiredConnectionTypes = new StringBuilder();

		IConnectionType[] connectionTypes = 

			(IConnectionType[]) compatibleConnectionTypes.toArray(new IConnectionType[compatibleConnectionTypes.size()]);

		for (int i = 0; i < connectionTypes.length; i++) {

			IConnectionType type = connectionTypes[i];

			if (requiredConnectionTypes.length() > 0)

				requiredConnectionTypes.append(", "); //$NON-NLS-1$

			if (i == connectionTypes.length - 1)

				requiredConnectionTypes.append(Messages.getString("ClientServiceSiteUI2.Or")); //$NON-NLS-1$

			requiredConnectionTypes.append(type.getDisplayName());

		}

		return requiredConnectionTypes.toString();

	}

	/* (non-Javadoc)

	 * @see com.nokia.carbide.remoteconnections.interfaces.IClientServiceSiteUI2#getConnectionDisplayName(java.lang.String)

	 */

	public String getConnectionDisplayName(String connection) {

		String display = connectionNames.get(connection);

		if (display == null)

			display = MessageFormat.format(Messages.getString("ClientServiceSiteUI2.DeletedConnectionDisplayName"), connection); //$NON-NLS-1$

		return display;

	}

	public void addListener(IListener listener) {

		if (listenerList == null)

			listenerList = new ListenerList<IListener>();

		listenerList.add(listener);

	}

	public void removeListener(IListener listener) {

		if (listenerList != null)

			listenerList.remove(listener);

	}

	private void fireConnectionSelected() {

		if (listenerList != null) {

			for (IListener listener : listenerList) {

				listener.connectionSelected();

			}

		}

	}

	/* (non-Javadoc)

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

	 */

	public void connectionAdded(IConnection connection) {

		refreshUI();

	}

	/* (non-Javadoc)

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

	 */

	public void connectionRemoved(IConnection connection) {

		refreshUI();		

	}

	/* (non-Javadoc)

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

	 */

	public void currentConnectionSet(IConnection connection) {

		refreshUI();		

	}

	/* (non-Javadoc)

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

	 */

	public void connectionStoreChanged() {

		refreshUI();		

	}

	/* (non-Javadoc)

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

	 */

	public void displayChanged() {

		refreshUI();		

	}

}