/*******************************************************************************
 * Copyright (c) 2001, 2008 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 org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
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.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;
import org.eclipse.wst.common.uriresolver.internal.provisional.URIResolver;
import org.eclipse.wst.common.uriresolver.internal.provisional.URIResolverPlugin;
import org.eclipse.wst.common.uriresolver.internal.util.URIHelper;
import org.eclipse.wst.xml.core.internal.contentmodel.CMDocument;
import org.eclipse.wst.xml.core.internal.contentmodel.ContentModelManager;
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.util.XMLCommonUIContextIds;

public class EditNamespaceInfoDialog extends Dialog {

	public static EditNamespaceInfoDialog invokeDialog(Shell shell, String title, NamespaceInfo info, IPath resourceLocation) {
		EditNamespaceInfoDialog dialog = new EditNamespaceInfoDialog(shell, info);
		dialog.create();
		dialog.getShell().setText(title);
		dialog.setBlockOnOpen(true);
		dialog.setResourceLocation(resourceLocation);
		dialog.open();
		return dialog;
	}

	protected Button browseButton;
	protected String errorMessage;

	protected Label errorMessageLabel;
	protected NamespaceInfo fInfo;
	protected Text locationHintField;

	protected Button okButton;
	protected Text prefixField;
	protected IPath resourceLocation;
	protected Text uriField;

	public EditNamespaceInfoDialog(Shell parentShell, NamespaceInfo info) {
		super(parentShell);
		setShellStyle(getShellStyle() | SWT.RESIZE);
		this.fInfo = info;
	}

	protected void buttonPressed(int buttonId) {
		if (buttonId == IDialogConstants.OK_ID) {
			fInfo.uri = uriField.getText();
			fInfo.prefix = prefixField.getText();
			fInfo.locationHint = locationHintField.getText();
		}
		super.buttonPressed(buttonId);
	}

	protected void computeErrorMessage() {
		errorMessage = null;
	}

	protected void createButtonsForButtonBar(Composite parent) {
		okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
		okButton.setEnabled(false);
		createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
		updateWidgets();
	}

	protected Control createDialogArea(Composite parent) {
		Composite dialogsubArea = (Composite) super.createDialogArea(parent);
		PlatformUI.getWorkbench().getHelpSystem().setHelp(dialogsubArea, XMLCommonUIContextIds.XCUI_NAMESPACE_DIALOG);

		Composite composite = new Composite(dialogsubArea, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.numColumns = 3;
		layout.marginWidth = 0;
		composite.setLayout(layout);

		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.widthHint = 350;
		composite.setLayoutData(gd);

		ModifyListener modifyListener = new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				updateWidgets();
			}
		};


		// row 1
		//
		Label uriLabel = new Label(composite, SWT.NONE);
		uriLabel.setText(XMLUIMessages._UI_LABEL_NAMESPACE_NAME_COLON);

		uriField = new Text(composite, SWT.SINGLE | SWT.BORDER);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.grabExcessHorizontalSpace = true;
		uriField.setLayoutData(gd);
		uriField.setText(getDisplayValue(fInfo.uri));
		uriField.addModifyListener(modifyListener);
		uriField.setEnabled(fInfo.getProperty("uri-readOnly") == null); //$NON-NLS-1$

		// never read
		Label placeHolder1 = new Label(composite, SWT.NONE);
		placeHolder1.setText(""); //$NON-NLS-1$

		// row 2
		//
		Label prefixLabel = new Label(composite, SWT.NONE);
		prefixLabel.setText(XMLUIMessages._UI_LABEL_PREFIX_COLON);

		prefixField = new Text(composite, SWT.SINGLE | SWT.BORDER);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.grabExcessHorizontalSpace = true;
		prefixField.setLayoutData(gd);
		prefixField.setText(getDisplayValue(fInfo.prefix));
		prefixField.addModifyListener(modifyListener);
		prefixField.setEnabled(fInfo.getProperty("prefix-readOnly") == null); //$NON-NLS-1$

		// never read
		Label placeHolder2 = new Label(composite, SWT.NONE);
		placeHolder2.setText(""); //$NON-NLS-1$

		// row 3
		//
		Label locationHintLabel = new Label(composite, SWT.NONE);
		locationHintLabel.setText(XMLUIMessages._UI_LABEL_LOCATION_HINT_COLON);

		locationHintField = new Text(composite, SWT.SINGLE | SWT.BORDER);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.grabExcessHorizontalSpace = true;
		locationHintField.setLayoutData(gd);
		locationHintField.setText(getDisplayValue(fInfo.locationHint));
		locationHintField.addModifyListener(modifyListener);
		locationHintField.setEnabled(fInfo.getProperty("locationHint-readOnly") == null); //$NON-NLS-1$

		SelectionListener selectionListener = new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				performBrowse();
			}
		};

		browseButton = new Button(composite, SWT.NONE);
		browseButton.setText(XMLUIMessages._UI_LABEL_BROWSE);
		browseButton.addSelectionListener(selectionListener);
		browseButton.setEnabled(locationHintField.getEnabled());

		// error message
		errorMessageLabel = new Label(dialogsubArea, SWT.NONE);
		errorMessageLabel.setText(XMLUIMessages.error_message_goes_here);
		errorMessageLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		Color color = new Color(errorMessageLabel.getDisplay(), 200, 0, 0);
		errorMessageLabel.setForeground(color);

		return dialogsubArea;
	}

	protected String getDisplayValue(String string) {
		return string != null ? string : ""; //$NON-NLS-1$
	}

	protected void performBrowse() {
		String[] extensions = {".xsd"}; //$NON-NLS-1$
		SelectFileOrXMLCatalogIdDialog dialog = new SelectFileOrXMLCatalogIdDialog(getShell(), extensions);
		dialog.create();
		dialog.getShell().setText(XMLUIMessages._UI_LABEL_SELECT_FILE);
		dialog.setBlockOnOpen(true);
		dialog.open();

		if (dialog.getReturnCode() == Window.OK) {
			String grammarURI = null;
			IFile file = dialog.getFile();
			String id = dialog.getId();
			if (file != null) {
				String uri = null;
				if (resourceLocation != null) {
					IResource resource = ResourcesPlugin.getWorkspace().getRoot().findMember(resourceLocation);
					if (resource != null) {
						IPath location = resource.getLocation();
						if (location != null) {
							uri = URIHelper.getRelativeURI(file.getLocation(), location);
						}
					}
					else {
					  uri = URIHelper.getRelativeURI(file.getLocation(), resourceLocation);
					}
					grammarURI = file.getLocation().toOSString();
				}
				else {
					uri = file.getLocation().toOSString();
					grammarURI = uri;
				}
				locationHintField.setText(uri);
			}
			else if (id != null) {
				locationHintField.setText(id);
				URIResolver resolver = URIResolverPlugin.createResolver();
				grammarURI = resolver.resolve(null, id, id);
			}


			CMDocument document = ContentModelManager.getInstance().createCMDocument(URIHelper.getURIForFilePath(grammarURI), "xsd"); //$NON-NLS-1$
			if(document != null) {
				List namespaceInfoList = (List) document.getProperty("http://org.eclipse.wst/cm/properties/namespaceInfo"); //$NON-NLS-1$
				if(namespaceInfoList != null) {
					NamespaceInfo info = (NamespaceInfo) namespaceInfoList.get(0);
					if(info != null) {
						if ((uriField.getText().trim().length() == 0) && (info.uri != null)) {
							uriField.setText(info.uri);
						}
						if ((prefixField.getText().trim().length() == 0) && (info.prefix != null)) {
							prefixField.setText(info.prefix);
						}
					}
				}
			}
		}
	}

	public void setResourceLocation(IPath path) {
		resourceLocation = path;
	}

	protected void updateErrorMessageLabel() {
		errorMessageLabel.setText(errorMessage != null ? errorMessage : ""); //$NON-NLS-1$
	}

	protected void updateOKButtonState() {
		if (okButton != null) {
			if ((uriField.getText().trim().length() == 0) && (prefixField.getText().trim().length() == 0) && (locationHintField.getText().trim().length() == 0)) {
				okButton.setEnabled(false);
			}
			else {
				okButton.setEnabled(errorMessage == null);
			}
		}
	}

	protected void updateWidgets() {
		computeErrorMessage();
		updateErrorMessageLabel();
		updateOKButtonState();
	}
}