/**
 * OLAT - Online Learning and Training<br>
 * http://www.olat.org
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); <br>
 * you may not use this file except in compliance with the License.<br>
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing,<br>
 * software distributed under the License is distributed on an "AS IS" BASIS,
 * <br>
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
 * See the License for the specific language governing permissions and <br>
 * limitations under the License.
 * <p>
 * Copyright (c) 1999-2006 at Multimedia- & E-Learning Services (MELS),<br>
 * University of Zurich, Switzerland.
 * <p>
 */

package org.olat.core.commons.editor.htmleditor;

import org.olat.core.commons.controllers.linkchooser.CustomLinkTreeModel;
import org.olat.core.gui.UserRequest;
import org.olat.core.gui.control.WindowControl;
import org.olat.core.logging.activity.IUserActivityLogger;
import org.olat.core.util.vfs.VFSContainer;

/**
 * Description: The WYSIWYGFactory provides a full-fledged WYSIWYG HTML editor
 * with support for media and link browsing based on a VFS item or a String.
 * <p>
 * The editor will keep any header information such as references to CSS or JS
 * files, but those will not be active while editing the file.
 * <p>
 * Keep in mind that this editor might be destructive when editing files that
 * have been created with an external, more powerful editor.
 * 
 * @author Felix Jost, Florian Gnägi Initial Date: Dez 10, 2005<br>
 */
public class WysiwygFactory {

	/**
 	 * Factory method to create a file based HTML editor instance that uses
	 * locking to prevent two people editing the same file.
	 * 
	 * @param ureq
	 * @param wControl
	 * @param rootDir
	 *            the basedir (below that folder all images can be chosen)
	 * @param filePath
	 *            the file e.g. "index.html"
	 * @param editorCheckEnabled
	 *            true: check if file has been created with another tool and
	 *            warn user about potential data loss; false: ignore other
	 *            authoring tools
	 * @param userActivityLogger
	 *            the userActivity Logger if used
	 * @return
	 */
	public static HTMLEditorController createWysiwygController(
			UserRequest ureq, WindowControl wControl, VFSContainer rootDir,
			String filePath, boolean editorCheckEnabled) {
		return new HTMLEditorController(ureq, wControl, rootDir, filePath,
				null, editorCheckEnabled);
	}

	/**
	 * Factory method to create a file based HTML editor instance that uses
	 * locking to prevent two people editing the same file. In this factory
	 * method, an custom link tree model can be used to give users the
	 * possiblity to link to some of your component. The generated links must be
	 * dispatchable by the framework or absolut external links.
	 * 
	 * @param ureq
	 * @param wControl
	 * @param baseContainer
	 *            the baseContainer (below that folder all images can be chosen)
	 * @param relFilePath
	 *            the file e.g. "index.html"
	 * @param userActivityLogger
	 *            the userActivity Logger if used
	 * @param customLinkTreeModel
	 *            Model for internal-link tree e.g. course-node tree with link
	 *            information
	 * @param editorCheckEnabled
	 *            true: check if file has been created with another tool and
	 *            warn user about potential data loss; false: ignore other
	 *            authoring tools
	 * @return Controller with internal-link selector
	 */
	public static HTMLEditorController createWysiwygControllerWithInternalLink(
			UserRequest ureq, WindowControl wControl, VFSContainer baseContainer,
			String relFilePath, boolean editorCheckEnabled,
			CustomLinkTreeModel customLinkTreeModel) {
		return new HTMLEditorController(ureq, wControl, baseContainer, relFilePath,
				customLinkTreeModel, editorCheckEnabled);
	}

	/**
	 * Factory method to create a string based HTML editor instance. The string
	 * must not contain a HTML HEAD, just the body. If you want to use the HTML
	 * editor in your form create a flexi form and use the FormUIFactory to
	 * create a RichTextElement instead.
	 * <p>
	 * This controller is a full-screen editor with a save and cancel button
	 * 
	 * @param ureq
	 * @param wControl
	 * @param rootDir
	 *            the basedir (below that folder all images can be chosen)
	 * @param htmlContent
	 *            the HTMLContent to edit
	 * @param userActivityLogger
	 *            the userActivity Logger if used
	 * @param customLinkTreeModel
	 *            Model for internal-link tree e.g. course-node tree with link
	 *            information
	 * @return Controller with internal-link selector
	 */
	public static HTMLEditorControllerWithoutFile createWysiwygControllerWithoutFile(
			UserRequest ureq, WindowControl wControl, VFSContainer rootDir,
			String htmlContent, 
			CustomLinkTreeModel customLinkTreeModel) {
		return new HTMLEditorControllerWithoutFile(ureq, wControl, rootDir,
				htmlContent, customLinkTreeModel);
	}
	
	/**
	 * Factory method to create a well formed XHTML frame and inserts the content
	 * into the body.
	 * @param bodyMarkup
	 * 						the XHTML content of the body part
	 * @param title
	 * 						title of this page
	 * @return XHTML page
	 */
	public static String createXHtmlFileContent(String bodyMarkup, String title) {
		StringBuffer fileContent = new StringBuffer();
		fileContent.append(HTMLEditorController.DOCTYPE).append(HTMLEditorController.OPEN_HTML).append(HTMLEditorController.OPEN_HEAD);
		fileContent.append(HTMLEditorController.GENERATOR_META).append(HTMLEditorController.UTF8CHARSET);
		fileContent.append(HTMLEditorController.OPEN_TITLE).append(title).append(HTMLEditorController.CLOSE_TITLE);
		fileContent.append(HTMLEditorController.CLOSE_HEAD_OPEN_BODY);
		fileContent.append(bodyMarkup);
		fileContent.append(HTMLEditorController.CLOSE_BODY_HTML);
		return fileContent.toString();
	}
}