/*

* 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.cdt.internal.debug.launch.wizard;

import java.util.ArrayList;

import java.util.List;

import org.eclipse.core.runtime.IConfigurationElement;

import org.eclipse.core.runtime.IExtension;

import org.eclipse.core.runtime.IExtensionPoint;

import org.eclipse.core.runtime.IExtensionRegistry;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Platform;

import org.eclipse.jface.dialogs.Dialog;

import org.eclipse.jface.viewers.DoubleClickEvent;

import org.eclipse.jface.viewers.IDoubleClickListener;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredContentProvider;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.SelectionChangedEvent;

import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.jface.viewers.TableViewer;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.jface.wizard.WizardPage;

import org.eclipse.swt.SWT;

import org.eclipse.swt.custom.SashForm;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Label;

import org.eclipse.ui.PlatformUI;

import com.nokia.cdt.internal.debug.launch.LaunchPlugin;

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

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

class LaunchCategorySelectionPage extends WizardPage implements ISelectionChangedListener, IStructuredContentProvider {

	private LaunchCreationWizard wizard;

	private FormBrowser descriptionBrowser;

	private TableViewer categorySelectionTableViewer = null;

	private class LaunchCategory {

		private String id;

		private String name;

		private String description;

		LaunchCategory(String id, String name, String description) {

			this.id = id;

			this.name = name;

			this.description = description;

		}

		public String getId() {

			return id;

		}

		public String getName() {

			return name;

		}

		public String getDescription() {

			return description;

		}

		@Override

		public boolean equals(Object obj) {

			if (obj instanceof LaunchCategory) {

				LaunchCategory category = (LaunchCategory)obj;

				// just compare the id and name to check for uniqueness

				return category.getId().equals(id) && category.getName().equals(name);

			}

			return false;

		}

		@Override

		public String toString() {

			return name;

		}

	}

	private List<LaunchCategory> categories = new ArrayList<LaunchCategory>();

	public LaunchCategorySelectionPage(LaunchCreationWizard wizard) throws Exception {

		super(Messages.getString("LaunchCategorySelectionPage.title")); //$NON-NLS-1$

		setTitle(Messages.getString("LaunchCategorySelectionPage.title")); //$NON-NLS-1$

		setDescription(Messages.getString("LaunchCategorySelectionPage.description")); //$NON-NLS-1$

		this.wizard = wizard;

		descriptionBrowser = new FormBrowser();

		descriptionBrowser.setText(""); //$NON-NLS-1$

		// add the built in categories

		if (wizard.getWizardsForCategory(AbstractLaunchWizard.PHONE_CATEGORY_ID).size() > 0) {

			categories.add(new LaunchCategory(AbstractLaunchWizard.PHONE_CATEGORY_ID,

					Messages.getString("LaunchCategorySelectionPage.phone"), //$NON-NLS-1$));

					Messages.getString("LaunchCategorySelectionPage.phoneDesc"))); //$NON-NLS-1$));

		}

		if (wizard.getWizardsForCategory(AbstractLaunchWizard.BOARD_CATEGORY_ID).size() > 0) {

			categories.add(new LaunchCategory(AbstractLaunchWizard.BOARD_CATEGORY_ID,

					Messages.getString("LaunchCategorySelectionPage.board"), //$NON-NLS-1$));

					Messages.getString("LaunchCategorySelectionPage.boardDesc"))); //$NON-NLS-1$));

		}

		loadCategoryExtensions();

	}

	public void createDescriptionIn(Composite composite) {

		descriptionBrowser.createControl(composite);

		Control c = descriptionBrowser.getControl();

		GridData gd = new GridData(GridData.FILL_BOTH);

		gd.widthHint = 200;

		c.setLayoutData(gd);

	}

	public void setDescriptionText(String text) {

		descriptionBrowser.setText(text);

	}

	public void moveToNextPage() {

		getContainer().showPage(getNextPage());

	}

	public void createControl(Composite parent) {

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

		GridLayout layout = new GridLayout();

		layout.verticalSpacing = 10;

		container.setLayout(layout);

		container.setLayoutData(new GridData(GridData.FILL_BOTH));

		Label label = new Label(container, SWT.NONE);

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

		GridData gd = new GridData();

		label.setLayoutData(gd);

		SashForm sashForm = new SashForm(container, SWT.VERTICAL);

		gd = new GridData(GridData.FILL_BOTH);

		gd.widthHint = 300;

		gd.heightHint = 300;

		gd.minimumHeight = 230;

		sashForm.setLayoutData(gd);

		categorySelectionTableViewer = new TableViewer(sashForm, SWT.BORDER);

		categorySelectionTableViewer.setContentProvider(this);

		categorySelectionTableViewer.addDoubleClickListener(new IDoubleClickListener() {

			public void doubleClick(DoubleClickEvent event) {

				selectionChanged(new SelectionChangedEvent(categorySelectionTableViewer, categorySelectionTableViewer.getSelection()));

				moveToNextPage();

			}

		});

		categorySelectionTableViewer.setInput(categories);

		categorySelectionTableViewer.addSelectionChangedListener(this);

		createDescriptionIn(sashForm);

		sashForm.setWeights(new int[] {75, 25});

		Dialog.applyDialogFont(container);

		setControl(container);

		// select the first element by default

		categorySelectionTableViewer.setSelection(new StructuredSelection(categorySelectionTableViewer.getElementAt(0)), true);

		PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), LaunchWizardHelpIds.CATEGORY_SELECTION_PAGE);

	}

	public void selectionChanged(SelectionChangedEvent event) {

		String description = null;

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

		if (!selection.isEmpty()) {

			LaunchCategory selectedCategory = (LaunchCategory)selection.getFirstElement();

			description = selectedCategory.getDescription();

		}

		setDescriptionText(description);

	}

	public void setVisible(boolean visible) {

		super.setVisible(visible);

		if (visible && categorySelectionTableViewer != null) {

			categorySelectionTableViewer.getTable().setFocus();

		}

	}

	public Object[] getElements(Object inputElement) {

		return categories.toArray();

	}

	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {

	}

	public String getSelectedCategoryId() {

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

		LaunchCategory selectedCategory = (LaunchCategory)selection.getFirstElement();

		return selectedCategory.getId();

	}

	private void loadCategoryExtensions() {

		// load any category extensions

		IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();

		IExtensionPoint extensionPoint = extensionRegistry.getExtensionPoint(LaunchPlugin.PLUGIN_ID + ".launchCategoryExtension"); //$NON-NLS-1$

		IExtension[] extensions = extensionPoint.getExtensions();

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

			IExtension extension = extensions[i];

			IConfigurationElement[] elements = extension.getConfigurationElements();

			Check.checkContract(elements.length == 1);

			IConfigurationElement element = elements[0];

			boolean failed = false;

			try {

				String id = element.getAttribute("id"); //$NON-NLS-1$

				String name = element.getAttribute("name"); //$NON-NLS-1$

				String description = element.getAttribute("description"); //$NON-NLS-1$

				if (id == null || name == null || description == null) {

					failed = true;

				} else {

					if (wizard.getWizardsForCategory(id).size() > 0) {

						LaunchCategory category = new LaunchCategory(id, name, description);

						if (!categories.contains(category)) {

							categories.add(category);

						} else {

							failed = true;

						}

					}

				}

			} 

			catch (Exception e) {

				failed = true;

			}

			if (failed) {

				LaunchPlugin.log(Logging.newStatus(LaunchPlugin.getDefault(), 

						IStatus.ERROR,

						"Unable to load launchCategoryExtension extension from " + extension.getContributor().getName()));

			}

		}

	}

}