package org.argeo.eclipse.ui.jcr.views;

import java.util.Arrays;

import javax.jcr.Node;
import javax.jcr.Property;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.argeo.ArgeoException;
import org.argeo.eclipse.ui.jcr.browser.NodeContentProvider;
import org.argeo.eclipse.ui.jcr.browser.NodeLabelProvider;
import org.argeo.eclipse.ui.jcr.browser.PropertiesContentProvider;
import org.argeo.eclipse.ui.jcr.browser.RepositoryNode;
import org.argeo.eclipse.ui.jcr.browser.WorkspaceNode;
import org.argeo.eclipse.ui.jcr.utils.JcrFileProvider;
import org.argeo.eclipse.ui.jcr.utils.NodeViewerComparer;
import org.argeo.eclipse.ui.specific.FileHandler;
import org.argeo.jcr.RepositoryRegister;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.ui.part.ViewPart;

public class GenericJcrBrowser extends ViewPart {
	private final static Log log = LogFactory.getLog(GenericJcrBrowser.class);

	private TreeViewer nodesViewer;
	private TableViewer propertiesViewer;

	private RepositoryRegister repositoryRegister;

	@Override
	public void createPartControl(Composite parent) {

		// Instantiate the generic object that fits for
		// both RCP & RAP, must be final to be accessed in the double click
		// listener.
		// Not that in RAP, it registers a service handler that provide the
		// access to the files.

		final JcrFileProvider jfp = new JcrFileProvider();
		final FileHandler fh = new FileHandler(jfp);

		parent.setLayout(new FillLayout());

		SashForm sashForm = new SashForm(parent, SWT.VERTICAL);
		sashForm.setSashWidth(4);
		sashForm.setLayout(new FillLayout());

		Composite top = new Composite(sashForm, SWT.NONE);
		GridLayout gl = new GridLayout(1, false);
		top.setLayout(gl);

		// nodes viewer
		nodesViewer = new TreeViewer(top, SWT.MULTI | SWT.H_SCROLL
				| SWT.V_SCROLL);
		nodesViewer.getTree().setLayoutData(
				new GridData(SWT.FILL, SWT.FILL, true, true));
		nodesViewer.setContentProvider(new NodeContentProvider());
		nodesViewer.setLabelProvider(new NodeLabelProvider());
		nodesViewer
				.addSelectionChangedListener(new ISelectionChangedListener() {
					public void selectionChanged(SelectionChangedEvent event) {
						if (!event.getSelection().isEmpty()) {
							IStructuredSelection sel = (IStructuredSelection) event
									.getSelection();
							propertiesViewer.setInput(sel.getFirstElement());
						} else {
							propertiesViewer.setInput(getViewSite());
						}
					}
				});

		nodesViewer.addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				if (event.getSelection() == null
						|| event.getSelection().isEmpty())
					return;
				Object obj = ((IStructuredSelection) event.getSelection())
						.getFirstElement();
				if (obj instanceof RepositoryNode) {
					RepositoryNode rpNode = (RepositoryNode) obj;
					rpNode.login();
					// For the file provider to be able to browse the various
					// repository.
					// TODO : enhanced that.
					jfp.setRepositoryNode(rpNode);
					nodesViewer.refresh(obj);

				} else if (obj instanceof WorkspaceNode) {
					((WorkspaceNode) obj).login();
					nodesViewer.refresh(obj);
				} else if (obj instanceof Node) {
					Node node = (Node) obj;
					
					// double clic on a file node triggers its opening
					try {
						if (node.isNodeType("nt:file")) {
							String name = node.getName();
							String id = node.getIdentifier();
							fh.openFile(name, id);
						}
					} catch (RepositoryException re) {
						throw new ArgeoException(
								"Repository error while getting Node file info",
								re);
					}
				}
			}
		});

		// context menu
		MenuManager menuManager = new MenuManager();
		Menu menu = menuManager.createContextMenu(nodesViewer.getTree());
		nodesViewer.getTree().setMenu(menu);
		getSite().registerContextMenu(menuManager, nodesViewer);
		getSite().setSelectionProvider(nodesViewer);

		nodesViewer.setInput(repositoryRegister);

		Composite bottom = new Composite(sashForm, SWT.NONE);
		bottom.setLayout(new GridLayout(1, false));

		// properties viewer
		propertiesViewer = new TableViewer(bottom);
		propertiesViewer.getTable().setLayoutData(
				new GridData(SWT.FILL, SWT.FILL, true, true));
		propertiesViewer.getTable().setHeaderVisible(true);
		propertiesViewer.setContentProvider(new PropertiesContentProvider());
		TableViewerColumn col = new TableViewerColumn(propertiesViewer,
				SWT.NONE);
		col.getColumn().setText("Name");
		col.getColumn().setWidth(200);
		col.setLabelProvider(new ColumnLabelProvider() {
			public String getText(Object element) {
				try {
					return ((Property) element).getName();
				} catch (RepositoryException e) {
					throw new ArgeoException(
							"Unexpected exception in label provider", e);
				}
			}
		});
		col = new TableViewerColumn(propertiesViewer, SWT.NONE);
		col.getColumn().setText("Value");
		col.getColumn().setWidth(400);
		col.setLabelProvider(new ColumnLabelProvider() {
			public String getText(Object element) {
				try {
					Property property = (Property) element;
					if (property.getType() == PropertyType.BINARY)
						return "<binary>";
					else if (property.isMultiple())
						return Arrays.asList(property.getValues()).toString();
					else
						return property.getValue().getString();
				} catch (RepositoryException e) {
					throw new ArgeoException(
							"Unexpected exception in label provider", e);
				}
			}
		});
		col = new TableViewerColumn(propertiesViewer, SWT.NONE);
		col.getColumn().setText("Type");
		col.getColumn().setWidth(200);
		col.setLabelProvider(new ColumnLabelProvider() {
			public String getText(Object element) {
				try {
					return PropertyType.nameFromValue(((Property) element)
							.getType());
				} catch (RepositoryException e) {
					throw new ArgeoException(
							"Unexpected exception in label provider", e);
				}
			}
		});
		propertiesViewer.setInput(getViewSite());

		sashForm.setWeights(getWeights());

		nodesViewer.setComparer(new NodeViewerComparer());

	}

	@Override
	public void setFocus() {
		nodesViewer.getTree().setFocus();
	}

	/**
	 * To be overidden to adapt size of form and result frames.
	 * 
	 * @return
	 */
	protected int[] getWeights() {
		return new int[] { 70, 30 };
	}

	/*
	 * NOTIFICATION
	 */
	public void refresh(Object obj) {
		nodesViewer.refresh(obj);
	}

	public void nodeAdded(Node parentNode, Node newNode) {
		nodesViewer.refresh(parentNode);
		nodesViewer.expandToLevel(newNode, 0);
	}

	public void nodeRemoved(Node parentNode) {

		IStructuredSelection newSel = new StructuredSelection(parentNode);
		nodesViewer.setSelection(newSel, true);
		// Force refresh
		IStructuredSelection tmpSel = (IStructuredSelection) nodesViewer
				.getSelection();
		nodesViewer.refresh(tmpSel.getFirstElement());
	}

	// IoC
	public void setRepositoryRegister(RepositoryRegister repositoryRegister) {
		this.repositoryRegister = repositoryRegister;
	}

}