/*******************************************************************************
 * Copyright (c) 2003, 2011 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
 *******************************************************************************/
package org.eclipse.wst.server.ui.editor;

import org.eclipse.core.commands.operations.IUndoableOperation;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.forms.IManagedForm;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.wst.server.core.IServerWorkingCopy;
import org.eclipse.wst.server.ui.internal.editor.ServerEditorPartInput;
import org.eclipse.wst.server.ui.internal.editor.ServerResourceCommandManager;
/**
 * An abstract server editor section.
 * 
 * @since 1.0
 */
public abstract class ServerEditorSection {
	private String errorMessage = null;

	private ServerResourceCommandManager commandManager;

	private Composite parentComp;
	private ServerEditorPart editor;

	/**
	 * The server currently being edited.
	 */
	protected IServerWorkingCopy server;

	/**
	 * <code>true</code> if the server is read-only, and <code>false</code>
	 * otherwise.
	 */
	protected boolean readOnly;

	/**
	 * Initialize the section.
	 * 
	 * @param site the editor site
	 * @param input the editor input
	 */
	public void init(IEditorSite site, IEditorInput input) {
		if (input instanceof IServerEditorPartInput) {
			IServerEditorPartInput sepi = (IServerEditorPartInput) input;
			server = sepi.getServer();
			commandManager = ((ServerEditorPartInput) sepi).getServerCommandManager();
			readOnly = sepi.isServerReadOnly();
		}
	}

	/**
	 * Executes the given operation and adds it to the operation history
	 * with the correct context.
	 * 
	 * @param operation an operation ready to be executed
	 */
	public void execute(IUndoableOperation operation) {
		commandManager.execute(operation);
	}

	/**
	 * Create the section.
	 * 
	 * @param parent the parent composite
	 */
	public void createSection(Composite parent) {
		this.parentComp = parent;
	}

	/**
	 * Return the shell of the section.
	 * 
	 * @return the shell
	 */
	public Shell getShell() {
		return parentComp.getShell();
	}

	/**
	 * Return the error message for this section.
	 * 
	 * @return the error message
	 * @see #getManagedForm() Use forms UI based for errors via {@link org.eclipse.ui.forms.IMessageManager}
	 *    on the message form instead of this method
	 */
	public String getErrorMessage() {
		return errorMessage;
	}

	/**
	 * Returns error or status messages that will be displayed when the
	 * server resource is saved. If there are any error messages, the
	 * user will be unable to save the editor.
	 * 
	 * @return a status object with code <code>IStatus.OK</code> if this
	 *   server can be saved, otherwise a status object indicating why
	 *   it can't be
	 * @see #getManagedForm() Use forms UI based for errors via {@link org.eclipse.ui.forms.IMessageManager}
	 *    on the message form instead of this method
	 */
	public IStatus[] getSaveStatus() {
		return new IStatus[] { Status.OK_STATUS };
	}

	/**
	 * Set the editor part that this section belongs to.
	 * 
	 * @param editor the editor
	 */
	public void setServerEditorPart(ServerEditorPart editor) {
		this.editor = editor;
	}

	/**
	 * Set an error message for this section.
	 * 
	 * @param error an error message
	 * @see #getManagedForm() Use forms UI based for errors via {@link org.eclipse.ui.forms.IMessageManager}
	 *    on the message form instead of this method
	 */
	public void setErrorMessage(String error) {
		if (error == null && errorMessage == null)
			return;
		
		if (error != null && error.equals(errorMessage))
			return;
		
		errorMessage = error;
		if (editor != null)
			editor.updateErrorMessage();
	}

	/**
	 * Get a form toolkit to create widgets. It will be disposed automatically
	 * when the editor is closed.
	 * 
	 * @param display the display
	 * @return a FormToolkit
	 */
	protected FormToolkit getFormToolkit(Display display) {
		return editor.getFormToolkit(display);
	}

	/**
	 * Returns the managed form that the editor is using, or <code>null</code> if no
	 * managed form has been set.
	 * 
	 * @return the managed form that the editor is using, or <code>null</code> if no
	 *    managed form has been set
	 * @since 1.1
	 */
	protected IManagedForm getManagedForm() {
		return editor.getManagedForm();
	}

	/**
	 * Allow a section an opportunity to respond to a doSave request on the editor.
	 * @param monitor the progress monitor for the save operation.
	 */
	public void doSave(IProgressMonitor monitor) {
		monitor.worked(100);
	}

	/**
	 * Allow a section an opportunity to respond to a doSaveAs request on the editor.
	 */
	public void doSaveAs() {
		// do nothing
	}
	
	/**
	 * Disposes of the section.
	 */
	public void dispose() {
		// ignore
	}
}