/*******************************************************************************
 * 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.sse.ui.internal.contentproperties.ui;

import java.util.Hashtable;
import java.util.Map;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.swt.SWT;
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.swt.widgets.Shell;
import org.eclipse.ui.dialogs.PropertyPage;
import org.eclipse.wst.sse.core.internal.provisional.IModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.internal.provisional.StructuredModelManager;
import org.eclipse.wst.sse.internal.contentproperties.ContentSettings;
import org.eclipse.wst.sse.internal.contentproperties.ContentSettingsCreator;
import org.eclipse.wst.sse.internal.contentproperties.IContentSettings;
import org.eclipse.wst.sse.ui.internal.SSEUIMessages;
import org.eclipse.wst.sse.ui.internal.SSEUIPlugin;

public abstract class ContentSettingsPropertyPage extends PropertyPage {
	private static final IStatus STATUS_ERROR = new Status(IStatus.ERROR, SSEUIPlugin.ID, IStatus.INFO, "ERROR", null); //$NON-NLS-1$

	// for validateEdit()
	private static final IStatus STATUS_OK = new Status(IStatus.OK, SSEUIPlugin.ID, IStatus.OK, "OK", null); //$NON-NLS-1$

	/**
	 * Method validateEdit.
	 * 
	 * @param file
	 *            org.eclipse.core.resources.IFile
	 * @param context
	 *            org.eclipse.swt.widgets.Shell
	 * @return IStatus
	 */
	private static IStatus validateEdit(IFile file, Shell context) {
		if (file == null || !file.exists())
			return STATUS_ERROR;
		if (!(file.isReadOnly()))
			return STATUS_OK;

		IPath fullIPath = file.getLocation();

		final long beforeModifiedFromJavaIO = fullIPath.toFile().lastModified();
		final long beforeModifiedFromIFile = file.getModificationStamp();

		IStatus status = ResourcesPlugin.getWorkspace().validateEdit(new IFile[]{file}, context);
		if (!status.isOK())
			return status;

		final long afterModifiedFromJavaIO = fullIPath.toFile().lastModified();
		final long afterModifiedFromIFile = file.getModificationStamp();

		if (beforeModifiedFromJavaIO != afterModifiedFromJavaIO) {
			IModelManager manager = StructuredModelManager.getModelManager();
			IStructuredModel model = manager.getExistingModelForRead(file);
			if (model != null) {
				if (!model.isDirty()) {
					try {
						file.refreshLocal(IResource.DEPTH_ONE, null);
					} catch (CoreException e) {
						return STATUS_ERROR;
					} finally {
						model.releaseFromRead();
					}
				} else {
					model.releaseFromRead();
				}
			}
		}

		if ((beforeModifiedFromJavaIO != afterModifiedFromJavaIO) || (beforeModifiedFromIFile != afterModifiedFromIFile)) {
			// the file is replaced. Modification cannot be
			// applied.
			return STATUS_ERROR;
		}
		return STATUS_OK;
	}

	protected ComboListOnPropertyPage[] combo;
	protected Composite composite;

	protected IContentSettings contentSettings;
	protected final String CSS_LABEL = SSEUIMessages.UI_CSS_profile___2; //$NON-NLS-1$
	protected final String DEVICE_LABEL = SSEUIMessages.UI_Target_Device___3; //$NON-NLS-1$

	protected final String DOCUMENT_LABEL = SSEUIMessages.UI_Default_HTML_DOCTYPE_ID___1; //$NON-NLS-1$
	protected int numberOfCombo;
	protected int numCols = 1;
	protected int numRows = 1;
	protected Composite propertyPage;

	public ContentSettingsPropertyPage() {
		super();
	}

	private void cleanUp() {
		// Are There any way to guarantee to call cleanUp() to re-load
		// downloaded .contentsettings file
		// after ContentSettings.releaseCache() in ContentSettingSelfHandler
		// class, which is called by resourceChangeEvent
	}


	protected ComboListOnPropertyPage createComboBoxOf(String title) {

		Label label = new Label(propertyPage, SWT.LEFT);
		label.setText(title);
		if (title != null && title.startsWith(SSEUIMessages.UI_Default_HTML_DOCTYPE_ID___1)) { //$NON-NLS-1$
			GridData data = new GridData();
			data.horizontalIndent = 10;
			label.setLayoutData(data);
		}
		ComboListOnPropertyPage combo = new ComboListOnPropertyPage(propertyPage, SWT.READ_ONLY);
		GridData data = new GridData();
		data.verticalAlignment = GridData.FILL;
		//data.horizontalAlignment= GridData.FILL;
		data.grabExcessHorizontalSpace = true;
		combo.setLayoutData(data);
		return combo;
	}


	protected Composite createComposite(Composite parent, int numColumns, int numRows) {
		Composite composite = new Composite(parent, SWT.NONE);

		//GridLayout
		GridLayout layout = new GridLayout();
		layout.numColumns = numColumns;
		composite.setLayout(layout);

		//GridData
		GridData data = new GridData();
		data.verticalAlignment = GridData.FILL;
		data.horizontalAlignment = GridData.FILL;
		data.grabExcessHorizontalSpace = true;
		//		data.horizontalSpan=numColumns;
		//		data.verticalSpan=numRows;

		composite.setLayoutData(data);
		return composite;
	}


	protected Control createContents(Composite parent) {

		contentSettings = ContentSettingsCreator.create();

		propertyPage = createComposite(parent, numCols, numRows);

		createSettingsPageGUI();

		return propertyPage;


	}

	protected abstract void createSettingsPageGUI();

	//protected abstract void applySelectedPropertyValue(String str,int
	// index);
	protected abstract void deleteNoneProperty(int index);


	protected boolean isInitValueChanged(String before, String after) {
		if (before == null && after == null)
			return false;
		if (before != null && before.equals(after))
			return false;
		return true;
	}


	protected void performDefaults() {
		super.performDefaults();
		// selected(applied) item is restored.
		for (int i = 0; i < numberOfCombo; i++) {
			//String appliedValue = combo[i].getApplyValue();
			//setSelectionItem(combo[i],appliedValue);
			combo[i].select(0); // select none.

		}

	}

	public boolean performOk() {
		Map properties = new Hashtable();
		if (validateState() == false) {
			cleanUp();
			return true;
		}
		for (int i = 0; i < numberOfCombo; i++) {
			// get selected item in Combo box.
			String str = combo[i].getSelectedValue();
			if (str == null)
				continue;
			// if no change, skip setProperty
			if (!isInitValueChanged(combo[i].getApplyValue(), str))
				continue;
			// if NONE is selected, delete attr instance (and write
			// .contentsettings.)
			if (str != null && str.length() == 0)
				deleteNoneProperty(i);
			else
				putSelectedPropertyInto(properties, str, i);
			//applySelectedPropertyValue(str,i);

			// set apply value in ComboListOnPropertyPage.
			combo[i].setApplyValue(str);
		}
		if (properties != null && !properties.isEmpty())
			contentSettings.setProperties((IResource) super.getElement(), properties);
		if (properties != null)
			properties.clear();
		properties = null;
		if (!contentSettings.existsProperties((IResource) super.getElement()))
			contentSettings.deleteAllProperties((IResource) super.getElement());
		return true;
	}

	protected abstract void putSelectedPropertyInto(Map properties, String str, int i);


	protected void setSelectionItem(ComboListOnPropertyPage combo, String value) {
		if (combo.getItemCount() <= 0)
			return;
		combo.setApplyValue(value);
		String item = combo.getKey(value);
		if (item != null)
			combo.select(combo.indexOf(item));
		else
			combo.select(0);

	}

	/*
	 * Validate Edit. Similar function will be in HTMLCommand.java
	 * ContentSettingsPropertyPage.java CSSActionManager.java
	 * DesignRedoAction.java DesignUndoAction.java
	 * HTMLConversionProcessor.java
	 */
	private boolean validateState() {

		// get IFile of .contentsettings
		final String name = ContentSettings.getContentSettingsName();
		final IResource resource = (IResource) super.getElement();
		final IProject project = resource.getProject();
		IFile file = project.getFile(name);

		if (file != null && !file.exists())
			return true; //Is this really OK?
		//If false should be returned,
		//This statemant can be removed,
		//since ModelManagerUtil.validateEdit()
		//returns error to this case.

		Shell shell = getControl().getShell();
		IStatus status = validateEdit(file, shell);
		return status.isOK() ? true : false;
	}

}