/*

* 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.ui;

import com.nokia.carbide.remoteconnections.Messages;

import com.nokia.carbide.remoteconnections.RemoteConnectionsActivator;

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

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.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.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.util.*;

import java.util.List;

/**

 * Implementation of IClientServiceSiteUI

 */

public class ClientServiceSiteUI implements IClientServiceSiteUI {

	private IService service;

	private ComboViewer viewer;

	private FontMetrics fm;

	private Set<IConnectionType> compatibleConnectionTypes;

	private Button editButton;

	private Button newButton;

	private IConnection connection;

	private ListenerList<IListener> listenerList;

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

	public ClientServiceSiteUI(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("ClientServiceSiteUI.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 IConnection);

				return ((IConnection) element).getDisplayName();

			}

		});

		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();

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

				if (!connection.equals(ClientServiceSiteUI.this.connection)) {

					ClientServiceSiteUI.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("ClientServiceSiteUI.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());

				setViewerInput(wizard.getConnectionToEdit());

			}

		});

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

		editButton.setText(Messages.getString("ClientServiceSiteUI.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 IConnection) {

					SettingsWizard wizard = new SettingsWizard((IConnection) value, service);

					wizard.open(composite.getShell());

					setViewerInput(wizard.getConnectionToEdit());

				}

			}

		});

		setViewerInput(null);

	}

	private void setViewerInput(IConnection connection) {

		List<IConnection> input = getCompatibleConnections();

		viewer.setInput(input);

		if (input.isEmpty())

			viewer.getCombo().setEnabled(false);

		else {

			viewer.getCombo().setEnabled(true);

			if (connection == null) {

				viewer.getCombo().select(0);

				viewer.setSelection(viewer.getSelection());

			}

			else

				selectConnection(connection);

		}

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

	}

	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 : RemoteConnectionsActivator.getConnectionsManager().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 =

			RemoteConnectionsActivator.getConnectionTypeProvider().getCompatibleConnectionTypeIds(service);

		for (String typeId : compatibleTypeIds) {

			compatibleConnectionTypes.add(

					RemoteConnectionsActivator.getConnectionTypeProvider().getConnectionType(typeId));

		}

	}

	public void selectConnection(IConnection connection) {

		if (!viewerInputContainsConnection(connection)) {

			addConnectionToViewerInput(connection);

		}

		viewer.setSelection(new StructuredSelection(connection));

	}

	private boolean viewerInputContainsConnection(IConnection connection) {

		Object input = viewer.getInput();

		if (input instanceof List) {

			return ((List) input).contains(connection);

		}

		return false;

	}

	private void addConnectionToViewerInput(IConnection connection) {

		Object input = viewer.getInput();

		if (input instanceof Collection) {

			List<IConnection> newInput = new ArrayList<IConnection>((Collection) input);

			newInput.add(connection);

			viewer.setInput(newInput);

		}

	}

	public IConnection getSelectedConnection() {

		return connection;

	}

	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();

			}

		}

	}

}