/*******************************************************************************
 * 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.dialogs;

import java.util.List;
import java.util.Vector;

import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
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.events.SelectionListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
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.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
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;

public class NamespaceInfoTable extends Composite {

	/**
	 * NamespaceInfoTableLabelProvider
	 */
	protected class NamespaceInfoTableLabelProvider implements ITableLabelProvider, IStructuredContentProvider {

		public void addListener(ILabelProviderListener listener) {
		}

		public void dispose() {
		}

		public Image getColumnImage(Object object, int columnIndex) {
			return null;
		}

		public String getColumnText(Object object, int column) {
			NamespaceInfo info = (NamespaceInfo) object;
			String result = null;
			switch (column) {
				case 0 : {
					result = info.uri;
					break;
				}
				case 1 : {
					result = info.prefix;
					break;
				}
				case 2 : {
					result = info.locationHint;
					break;
				}
			}
			result = result != null ? result : ""; //$NON-NLS-1$
			if (result.equals("")) { //$NON-NLS-1$
				switch (column) {
					case 0 : {
						result = XMLUIMessages._UI_NO_NAMESPACE_NAME; //$NON-NLS-1$
						break;
					}
					case 1 : {
						result = XMLUIMessages._UI_NO_PREFIX; //$NON-NLS-1$
						break;
					}
				}
			}
			return result;
		}

		 String getDefaultPrefix() {
			String defaultPrefix = "p"; //$NON-NLS-1$
			if (namespaceInfoList == null)
				return defaultPrefix;
			Vector v = new Vector();
			for (int i = 0; i < namespaceInfoList.size(); i++) {
				NamespaceInfo nsinfo = (NamespaceInfo) namespaceInfoList.get(i);
				if (nsinfo.prefix != null)
					v.addElement(nsinfo.prefix);
			}
			if (v.contains(defaultPrefix)) {
				String s = defaultPrefix;
				for (int j = 0; v.contains(s); j++) {
					s = defaultPrefix + Integer.toString(j);
				}
				return s;
			} else
				return defaultPrefix;
		}

		public Object[] getElements(Object inputElement) {
			return namespaceInfoList.toArray();
		}

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

		public boolean isDeleted(Object element) {
			return false;
		}

		public boolean isLabelProperty(Object object, Object property) {
			return false;
		}

		public boolean isLabelProperty(Object element, String property) {
			return false;
		}

		public void removeListener(ILabelProviderListener listener) {
		}
	}

	protected static final String LOCATION_HINT = XMLUIMessages._UI_LABEL_LOCATION_HINT; //$NON-NLS-1$
	protected static final String NAMESPACE_URI = XMLUIMessages._UI_LABEL_NAMESPACE_NAME; //$NON-NLS-1$
	protected static final String PREFIX = XMLUIMessages._UI_LABEL_PREFIX; //$NON-NLS-1$
	protected Button deleteButton;
	protected boolean dummyRowsRemoved = false;
	protected Button editButton;
	protected List namespaceInfoList = new Vector();
	protected Button newButton;
	protected NamespaceInfoTableLabelProvider provider;
	protected IPath resourceLocation;
	protected TableViewer tableViewer;
	protected UpdateListener updateListener;
	protected int visibleRows = -1;

	public NamespaceInfoTable(Composite parent) {
		this(parent, -1, -1, -1);
	}

	public NamespaceInfoTable(Composite parent, int visibleRows) {
		this(parent, -1, -1, visibleRows);
	}

	public NamespaceInfoTable(Composite parent, int widthHint, int heightHint) {
		this(parent, widthHint, heightHint, -1);
	}

	public NamespaceInfoTable(Composite parent, int widthHint, int heightHint, int visibleRows) {
		super(parent, SWT.NONE);
		setLayout(createGridLayout());
		setLayoutData(new GridData(GridData.FILL_BOTH));
		Group namespaceInfoGroup = new Group(this, SWT.NONE);
		namespaceInfoGroup.setText(XMLUIMessages._UI_LABEL_XML_SCHEMA_INFORMATION); //$NON-NLS-1$
		namespaceInfoGroup.setLayout(new GridLayout());
		GridData gd = new GridData(GridData.FILL_BOTH);
		if (widthHint != -1) {
			gd.widthHint = widthHint;
		}
		if (heightHint != -1) {
			gd.heightHint = heightHint;
		}
		namespaceInfoGroup.setLayoutData(gd);
		//WorkbenchHelp.setHelp(namespaceInfoGroup, new
		// ControlContextComputer(namespaceInfoGroup,
		// XMLBuilderContextIds.XMLC_NAMESPACE_GROUP));
		String[] titleArray = {NAMESPACE_URI, PREFIX, LOCATION_HINT};
		tableViewer = new TableViewer(namespaceInfoGroup, SWT.FULL_SELECTION);
		provider = new NamespaceInfoTableLabelProvider();
		tableViewer.setContentProvider(provider);
		tableViewer.setLabelProvider(provider);
		tableViewer.setColumnProperties(titleArray);
		Table table = tableViewer.getTable();
		table.setHeaderVisible(true);
		table.setLayoutData(new GridData(GridData.FILL_BOTH));
		int[] widthArray = {50, 20, 30};
		TableLayout layout = new TableLayout();
		for (int i = 0; i < titleArray.length; i++) {
			TableColumn column = new TableColumn(table, i);
			column.setText(titleArray[i]);
			column.setAlignment(SWT.LEFT);
			layout.addColumnData(new ColumnWeightData(widthArray[i], true));
		}
		this.visibleRows = visibleRows;
		for (int i = 0; i < visibleRows; i++) {
			TableItem item = new TableItem(table, SWT.NONE);
			item.setText("#######"); //$NON-NLS-1$
		}
		table.setLayout(layout);
		CellEditor[] cellEditors = new CellEditor[titleArray.length];
		cellEditors[1] = new TextCellEditor(table);
		cellEditors[2] = new TextCellEditor(table);
		tableViewer.setCellEditors(cellEditors);
		MouseAdapter mouseAdapter = new MouseAdapter() {
			public void mouseDoubleClick(MouseEvent e) {
				if (tableViewer.getTable().getItem(new Point(e.x, e.y)) != null) {
					performEdit();
				}
			}
		};
		table.addMouseListener(mouseAdapter);
		createButtons(namespaceInfoGroup);
		ISelectionChangedListener selectionChangedListener = new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				updateButtonEnabledState();
			}
		};
		tableViewer.addSelectionChangedListener(selectionChangedListener);
	}

	protected void createButtons(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		composite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 2;
		gridLayout.marginHeight = 0;
		gridLayout.marginWidth = 0;
		composite.setLayout(gridLayout);
		Button hiddenButton = new Button(composite, SWT.NONE);
		hiddenButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		hiddenButton.setVisible(false);
		hiddenButton.setEnabled(false);
		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(new GridData(GridData.FILL_HORIZONTAL));
		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(XMLUIMessages._UI_BUTTON_NEW); //$NON-NLS-1$
		newButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		newButton.addSelectionListener(selectionListener);
		// add the Edit button
		//
		editButton = new Button(buttonComposite, SWT.NONE);
		editButton.setText(XMLUIMessages._UI_BUTTON_EDIT); //$NON-NLS-1$
		editButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		editButton.addSelectionListener(selectionListener);
		// add the Delete button
		//
		deleteButton = new Button(buttonComposite, SWT.NONE);
		deleteButton.setText(XMLUIMessages._UI_BUTTON_DELETE); //$NON-NLS-1$
		deleteButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		deleteButton.addSelectionListener(selectionListener);
	}

	public GridLayout createGridLayout() {
		GridLayout gridLayout = new GridLayout();
		gridLayout.marginWidth = 0;
		gridLayout.horizontalSpacing = 0;
		return gridLayout;
	}

	public List getNamespaceInfoList() {
		return namespaceInfoList;
	}

	protected NamespaceInfo getTargetNamespaceInfo() {
		return (namespaceInfoList != null && namespaceInfoList.size() > 0) ? (NamespaceInfo) namespaceInfoList.get(0) : null;
	}

	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() {
		Runnable delayedUpdate = new Runnable() {
			public void run() {
				update();
			}
		};
		getDisplay().asyncExec(delayedUpdate);
		if (updateListener != null) {
			updateListener.updateOccured(this, namespaceInfoList);
		}
	}

	public void performDelete() {
		ISelection selection = tableViewer.getSelection();
		Object selectedObject = (selection instanceof IStructuredSelection) ? ((IStructuredSelection) selection).getFirstElement() : null;
		if (selectedObject != null) {
			namespaceInfoList.remove(selectedObject);
			performDelayedUpdate();
		}
	}

	public void performEdit() {
		ISelection selection = tableViewer.getSelection();
		Object selectedObject = (selection instanceof IStructuredSelection) ? ((IStructuredSelection) selection).getFirstElement() : null;
		if (selectedObject instanceof NamespaceInfo) {
			EditNamespaceInfoDialog dialog = invokeDialog(XMLUIMessages._UI_LABEL_NEW_NAMESPACE_INFORMATION, (NamespaceInfo) selectedObject); //$NON-NLS-1$
			performDelayedUpdate();
		}
	}

	public void performNew() {
		NamespaceInfo info = new NamespaceInfo();
		EditNamespaceInfoDialog dialog = invokeDialog(XMLUIMessages._UI_LABEL_NEW_NAMESPACE_INFORMATION, info); //$NON-NLS-1$
		if (dialog.getReturnCode() == Window.OK) {
			namespaceInfoList.add(info);
			performDelayedUpdate();
		}
	}

	public void setNamespaceInfoList(List namespaceInfoList) {
		this.namespaceInfoList = namespaceInfoList;
		update();
	}

	public void setResourceLocation(IPath resourceLocation) {
		this.resourceLocation = resourceLocation;
	}

	public void setUpdateListener(UpdateListener updateListener) {
		this.updateListener = updateListener;
	}

	public void update() {
		updateHelper(namespaceInfoList);
	}

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

	public void updateHelper(List namespaceInfoList) {
		if (visibleRows != -1 && !dummyRowsRemoved) {
			dummyRowsRemoved = true;
			tableViewer.getTable().removeAll();
		}
		ISelection selection = tableViewer.getSelection();
		tableViewer.setInput(namespaceInfoList);
		if (selection.isEmpty()) {
			if (namespaceInfoList.size() > 0) {
				tableViewer.setSelection(new StructuredSelection(namespaceInfoList.get(0)));
			}
		} else {
			tableViewer.setSelection(selection);
		}
	}
}