package net.sourceforge.phpdt.sql.actions;


import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;

import org.apache.crimson.tree.XmlDocument;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.ui.IViewActionDelegate;
import org.eclipse.ui.IViewPart;
import org.w3c.dom.Element;

import net.sourceforge.phpdt.sql.Messages;
import net.sourceforge.phpdt.sql.sql.metadata.MetaDataXMLInterface;
import net.sourceforge.phpdt.sql.sql.metadata.ObjectMetaData;
import net.sourceforge.phpdt.sql.view.BookmarkView;
import net.sourceforge.phpdt.sql.view.SubsetView;
import net.sourceforge.phpdt.sql.view.bookmark.BookmarkNode;
import net.sourceforge.phpdt.sql.view.bookmark.ObjectNode;
import net.sourceforge.phpdt.sql.view.bookmark.SubsetNode;
import net.sourceforge.phpdt.sql.view.bookmark.TableNode;
import net.sourceforge.phpdt.sql.view.bookmark.TreeNode;
import net.sourceforge.phpdt.sql.view.bookmark.ViewNode;

/**
 * @author root
 *
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>Templates.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 */
public class ExportXMLAction extends Action implements IViewActionDelegate {
	IViewPart view;
	/**
	 * @see org.eclipse.ui.IViewActionDelegate#init(IViewPart)
	 */
	public void init(IViewPart view) {
		this.view = view;
	}

	/**
	 * @see org.eclipse.ui.IActionDelegate#run(IAction)
	 */
	public void run(IAction action) {
		run();
	}
		
	public void run() {
		
		FileDialog dialog = new FileDialog(view.getSite().getShell(), SWT.SAVE);
		dialog.setFilterExtensions(new String[]{"*.xml","*.*"}); //$NON-NLS-1$ //$NON-NLS-2$
		dialog.setFilterNames(new String[]{Messages.getString("filedialog.xmlFiles"),Messages.getString("filedialog.xmlFiles")}); //$NON-NLS-1$ //$NON-NLS-2$
		
		String filename = dialog.open();
		if (filename == null) return;
		/*Check for the presence of a "." - either indicates an
		 * extension has been provided or that a filename with a '.'
		 * has been specified - if the latter, it is assumed the user
		 * knows what they're doing - could be dangerous! :-)
		 */
		if (filename.indexOf(".") ==0) filename += ".xml";
		File file = new File(filename);
		System.out.println(Messages.getString("ExportXMLAction.XMLExporting") + file); //$NON-NLS-1$
		FileOutputStream out = null;
		try {
			out = new FileOutputStream(file);
		} catch (FileNotFoundException e1) {
			MessageDialog.openConfirm(view.getSite().getShell(), Messages.getString("ExportXMLAction.CannotOpenFile"), //$NON-NLS-1$
						Messages.getString("ExportXMLAction.CannotOpenFileMessage") + filename+ //$NON-NLS-1$ 
						Messages.getString("ExportXMLAction.CannotOpenFileExplain"));  //$NON-NLS-1$ 
			e1.printStackTrace();
			return;
		}
		XmlDocument doc = new XmlDocument();
		StructuredSelection selection = null;
		if (view instanceof BookmarkView){
			BookmarkView bookmarkView = (BookmarkView) view;
			selection = bookmarkView.getSelection(); 
		} else if (view instanceof SubsetView){
			SubsetView subsetView = (SubsetView) view;
			selection = subsetView.getSelection();
		}

		ExportXMLSelection(doc, selection);
		try {
			doc.write(out);
			out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}

		
	}

	public static void ExportXMLSelection(XmlDocument doc, StructuredSelection selection) {
		Element root = (Element) doc.appendChild(doc.createElement(Messages.getString("ExportXMLAction.Metadata"))); //$NON-NLS-1$
		MetaDataXMLInterface.createElementText(root, Messages.getString("ExportXMLAction.Author"), //$NON-NLS-1$
									Messages.getString("ExportXMLAction.PHPEclipseSQL")); //$NON-NLS-1$
		MetaDataXMLInterface.createElementText(root, Messages.getString("ExportXMLAction.Version"), //$NON-NLS-1$
									Messages.getString("ExportXMLAction.XMLVersionNumber")); //$NON-NLS-1$
		Iterator iter = selection.iterator();
		while (iter.hasNext()) {
			TreeNode current = (TreeNode) iter.next();
			if (current instanceof SubsetNode){
				SubsetNode subset = (SubsetNode) current;
				MetaDataXMLInterface.createElementText(root, Messages.getString("ExportXMLAction.Subset"), //$NON-NLS-1$
												subset.getName()); //$NON-NLS-1$
				Object[] children = subset.getChildren();
				for (int i = 0; i < children.length; i++) {
					TreeNode objectNode = (TreeNode) children[i];
					ExportXMLAction.exportObject(root, objectNode);					
				}
			}
			ExportXMLAction.exportObject(root, current);
		}
		
	}

	/**
	 * @see org.eclipse.ui.IActionDelegate#selectionChanged(IAction, ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
	}

	/**
	 * Exports a TreeNode metadata representation to an XmlDocument, based on a an already-created root Element
	 * @param doc The XmlDocument to receive the metadata representation
	 * @param node The node with the metadata to export
	 * @param root The root element (already present in the XmlDocument) that will hold the metadata
	 */
	public static void exportObject(Element root, TreeNode node) {
		
		XmlDocument doc = (XmlDocument) root.getOwnerDocument();
		String name = node.getName();
		Element table = null;
		if (node instanceof TableNode)
			table = (Element) root.appendChild(doc.createElement(Messages.getString("ExportXMLAction.Table"))); //$NON-NLS-1$
		else if (node instanceof ViewNode)
			table = (Element) root.appendChild(doc.createElement(Messages.getString("ExportXMLAction.View"))); //$NON-NLS-1$
		else if (node instanceof ObjectNode)
			table = (Element) root.appendChild(doc.createElement(Messages.getString("ExportXMLAction.View"))); //$NON-NLS-1$
		else
			return;
		MetaDataXMLInterface.createElementText(table,Messages.getString("ExportXMLAction.TableName"), name); //$NON-NLS-1$
		
		if (node instanceof TableNode || node instanceof ViewNode){
			BookmarkNode bookmark = (BookmarkNode) node.getParent();
			if (bookmark != null){
				MetaDataXMLInterface.createElementText(table,Messages.getString("ExportXMLAction.BookmarkName"), bookmark.getName()); //$NON-NLS-1$
			}
		}
		
		ObjectMetaData objMetaData = node.getMetaData();
		if (objMetaData != null)
			MetaDataXMLInterface.metaDataToXML(objMetaData, doc, table);
	}

}