/*******************************************************************************
 * Copyright (c) 2001, 2004 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.xml.ui.internal.nsedit;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wst.xml.core.internal.contentmodel.util.NamespaceInfo;
import org.eclipse.wst.xml.ui.internal.XMLUIMessages;
import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;
import org.eclipse.wst.xml.ui.internal.dialogs.EditNamespaceInfoDialog;
import org.eclipse.wst.xml.ui.internal.dialogs.NamespaceInfoErrorHelper;

public class CommonEditNamespacesDialog {
	protected Composite commonComposite;
	protected Button deleteButton;
	protected Button editButton;

	protected Label errorMessageLabel;
	protected int heightHint = 250;
	protected List namespaceInfoList = new ArrayList();

	protected Button newButton;
	protected IPath resourceLocation;

	private boolean showLocationText = false;
	protected String tableLabel = ""; //$NON-NLS-1$
	protected CommonNamespaceInfoTable tableViewer;

	protected Composite topComposite;
	protected boolean useGroup;
	protected int widthHint = 500;

	public CommonEditNamespacesDialog(Composite parent, IPath resourceLocation, String stringTableLabel) {
		this(parent, resourceLocation, stringTableLabel, false, false);
	}

	public CommonEditNamespacesDialog(Composite parent, IPath resourceLocation, String stringTableLabel, boolean useGroup, boolean showLocText) {
		this.resourceLocation = resourceLocation;
		tableLabel = stringTableLabel;
		this.useGroup = useGroup;
		showLocationText = showLocText;

		GridData gd = new GridData(GridData.FILL_BOTH);
		if (widthHint != -1) {
			gd.widthHint = widthHint;
		}
		if (heightHint != -1) {
			gd.heightHint = heightHint;
		}

		// Set GridData and GridLayout for the parent Composite
		parent.setLayoutData(gd);
		parent.setLayout(new GridLayout());

		// Create the top Composite
		topComposite = new Composite(parent, SWT.NONE);
		GridData topData = new GridData(GridData.FILL_HORIZONTAL);
		topData.heightHint = 0;
		topComposite.setLayoutData(topData);
		topComposite.setLayout(new GridLayout());

		// Create the 'common'/middle Composite
		if (useGroup) {
			commonComposite = new Group(parent, SWT.NONE);
		}
		else {
			commonComposite = new Composite(parent, SWT.NONE);
		}
		commonComposite.setLayoutData(new GridData(GridData.FILL_BOTH));
		commonComposite.setLayout(new GridLayout(3, false));

		// Add the error Message Label
		errorMessageLabel = new Label(parent, SWT.NONE);
		errorMessageLabel.setLayoutData(createHorizontalFill());
		Color color = new Color(errorMessageLabel.getDisplay(), 200, 0, 0);
		errorMessageLabel.setForeground(color);

		createControlArea();
	}


	protected void createButtons(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		composite.setLayoutData(new GridData(GridData.FILL_VERTICAL));
		GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 1;
		gridLayout.marginHeight = 0;
		gridLayout.marginWidth = 0;
		composite.setLayout(gridLayout);

		SelectionListener selectionListener = new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				if (e.widget == newButton) {
					performNew();
				}
				else if (e.widget == editButton) {
					performEdit();
				}
				else if (e.widget == deleteButton) {
					performDelete();
				}
			}
		};

		// create a composite to hold the three buttons
		Composite buttonComposite = new Composite(composite, SWT.NONE);
		buttonComposite.setLayoutData(createHorizontalFill());
		GridLayout buttonGridLayout = new GridLayout();
		// buttonGridLayout.numColumns = 3;
		// buttonGridLayout.makeColumnsEqualWidth = true;
		buttonComposite.setLayout(buttonGridLayout);

		// add the New button
		//
		newButton = new Button(buttonComposite, SWT.NONE);
		// newButton.setText(" " +
		// XMLCommonUIPlugin.getInstance().getString("_UI_BUTTON_NEW") + " ");
		newButton.setText("   " + XMLUIMessages.CommonEditNamespacesDialog_0 + "   "); //$NON-NLS-1$ //$NON-NLS-2$ 
		newButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); // ViewUtility.createHorizontalFill());
		newButton.addSelectionListener(selectionListener);

		// add the Edit button
		//
		// gd = new GridData();
		// gd.horizontalAlignment = gd.FILL;
		// gd.grabExcessHorizontalSpace = true;

		editButton = new Button(buttonComposite, SWT.NONE);
		editButton.setText(XMLUIMessages._UI_BUTTON_EDIT);
		editButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); // ViewUtility.createHorizontalFill());
		editButton.addSelectionListener(selectionListener);

		// add the Delete button
		//
		// gd = new GridData();
		// gd.horizontalAlignment = gd.FILL;
		// gd.grabExcessHorizontalSpace = true;

		deleteButton = new Button(buttonComposite, SWT.NONE);
		deleteButton.setText(XMLUIMessages._UI_BUTTON_DELETE);
		deleteButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); // ViewUtility.createHorizontalFill());
		deleteButton.addSelectionListener(selectionListener);
	}

	private void createControlArea() {
		if (useGroup) {
			((Group) commonComposite).setText(tableLabel);
		}
		else {
			Label label = new Label(commonComposite, SWT.NONE);
			label.setText(tableLabel);
			label.setLayoutData(createGridData(false, 3));
		}

		tableViewer = new CommonNamespaceInfoTable(commonComposite, 6, showLocationText);
		tableViewer.getControl().setLayoutData(createGridData(true, 2));
		createButtons(commonComposite);

		tableViewer.setInput(namespaceInfoList);
		updateButtonEnabledState();
		ISelectionChangedListener selectionChangedListener = new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				updateButtonEnabledState();
			}
		};
		tableViewer.addSelectionChangedListener(selectionChangedListener);
	}

	protected GridData createGridData(boolean both, int span) {
		GridData gd = new GridData(both ? GridData.FILL_BOTH : GridData.FILL_HORIZONTAL);
		gd.horizontalSpan = 2;
		return gd;
	}

	private GridData createHorizontalFill() {
		GridData gd = new GridData();
		gd.horizontalAlignment = GridData.FILL;
		gd.grabExcessHorizontalSpace = true;
		return gd;
	}


	public NamespaceInfo getNamespaceInfo(String namespace) {
		NamespaceInfo result = null;
		for (Iterator i = namespaceInfoList.iterator(); i.hasNext();) {
			NamespaceInfo info = (NamespaceInfo) i.next();
			if ((info.uri != null) && info.uri.equals(namespace)) {
				result = info;
				break;
			}
		}
		return result;
	}

	protected Object getSelection(ISelection selection) {
		if (selection == null) {
			return null;
		} // end of if ()

		Object result = null;
		if (selection instanceof IStructuredSelection) {
			IStructuredSelection es = (IStructuredSelection) selection;
			Iterator i = es.iterator();
			if (i.hasNext()) {
				result = i.next();
			}
		}
		return result;
	}

	/*
	 * Use the returned Composite to add content above the 'common contents'.
	 * Note: The GridData for the returned Composite has a heightHint = 0.
	 * This means when using the returned Composite, the GridData must be
	 * reset, else the Composite and it's contents will not appear.
	 */
	protected Composite getTopComposite() {
		return topComposite;
	}

	protected EditNamespaceInfoDialog invokeDialog(String title, NamespaceInfo info) {
		Shell shell = XMLUIPlugin.getInstance().getWorkbench().getActiveWorkbenchWindow().getShell();
		EditNamespaceInfoDialog dialog = new EditNamespaceInfoDialog(shell, info);
		dialog.create();
		dialog.getShell().setText(title);
		dialog.setBlockOnOpen(true);
		dialog.setResourceLocation(resourceLocation);
		dialog.open();
		return dialog;
	}

	protected void performDelayedUpdate() {
		tableViewer.refresh();
		/*
		 * Runnable delayedUpdate = new Runnable() { public void run() {
		 * tableViewer.refresh(); } };
		 * Display.getCurrent().asyncExec(delayedUpdate);
		 */
		// if (updateListener != null)
		// {
		// updateListener.updateOccured(this, namespaceInfoList);
		// }
	}

	public void performDelete() {
		ISelection selection = tableViewer.getSelection();
		if (selection instanceof IStructuredSelection) {
			IStructuredSelection structuredSelection = (IStructuredSelection) selection;
			namespaceInfoList.removeAll(structuredSelection.toList());
			updateErrorMessage(namespaceInfoList);
			performDelayedUpdate();
		}
	}

	public void performEdit() {
		Object selection = getSelection(tableViewer.getSelection());
		if (selection != null) {
			invokeDialog(XMLUIMessages._UI_LABEL_NEW_NAMESPACE_INFORMATION, (NamespaceInfo) selection);
			updateErrorMessage(namespaceInfoList);
			performDelayedUpdate();
		}
	}

	public void performNew() {
		Shell shell = XMLUIPlugin.getInstance().getWorkbench().getActiveWorkbenchWindow().getShell();
		CommonAddNamespacesDialog dialog = new CommonAddNamespacesDialog(shell, XMLUIMessages._UI_ADD_NAMESPACE_DECLARATIONS, resourceLocation, namespaceInfoList);
		dialog.createAndOpen();
		if (dialog.getReturnCode() == Window.OK) {
			namespaceInfoList.addAll(dialog.getNamespaceInfoList());
			updateErrorMessage(namespaceInfoList);
			performDelayedUpdate();
		}
	}

	public void setNamespaceInfoList(List list) {
		namespaceInfoList = list;
		tableViewer.setInput(namespaceInfoList);
	}

	public void updateButtonEnabledState() {
		Object selection = getSelection(tableViewer.getSelection());
		NamespaceInfo info = (NamespaceInfo) selection;
		editButton.setEnabled(info != null);
		deleteButton.setEnabled((info != null) && (info.getProperty("unremovable") == null)); //$NON-NLS-1$
	}

	public void updateErrorMessage(List namespaceInfoList) {
		NamespaceInfoErrorHelper helper = new NamespaceInfoErrorHelper();
		String errorMessage = helper.computeErrorMessage(namespaceInfoList, null);
		errorMessageLabel.setText(errorMessage != null ? errorMessage : ""); //$NON-NLS-1$
	}
}