/*******************************************************************************
 * 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.xml.ui.internal.views.contentoutline;

import org.eclipse.jface.action.IContributionItem;
import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.util.TransferDragSourceListener;
import org.eclipse.jface.util.TransferDropTargetListener;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.wst.common.ui.internal.dnd.ObjectTransfer;
import org.eclipse.wst.common.ui.internal.dnd.ViewerDragAdapter;
import org.eclipse.wst.common.ui.internal.dnd.ViewerDropAdapter;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.internal.util.StringUtils;
import org.eclipse.wst.sse.ui.internal.IReleasable;
import org.eclipse.wst.sse.ui.internal.contentoutline.PropertyChangeUpdateAction;
import org.eclipse.wst.sse.ui.internal.contentoutline.PropertyChangeUpdateActionContributionItem;
import org.eclipse.wst.sse.ui.internal.editor.EditorPluginImageHelper;
import org.eclipse.wst.sse.ui.internal.editor.EditorPluginImages;
import org.eclipse.wst.sse.ui.internal.provisional.views.contentoutline.StructuredContentOutlineConfiguration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMAttributeDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMDataType;
import org.eclipse.wst.xml.core.internal.contentmodel.CMElementDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.modelquery.ModelQuery;
import org.eclipse.wst.xml.core.internal.modelquery.ModelQueryUtil;
import org.eclipse.wst.xml.ui.internal.XMLUIMessages;
import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;
import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeContentProvider;
import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeLabelProvider;
import org.eclipse.wst.xml.ui.internal.contentoutline.XMLNodeActionManager;
import org.eclipse.wst.xml.ui.internal.dnd.XMLDragAndDropManager;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * Configuration for XML, expects that the viewer's input will be the DOM
 * Model
 */
public class XMLContentOutlineConfiguration extends StructuredContentOutlineConfiguration {
	private class ActionManagerMenuListener implements IMenuListener, IReleasable {
		private XMLNodeActionManager fActionManager;
		private TreeViewer fTreeViewer;

		public ActionManagerMenuListener(TreeViewer viewer) {
			fTreeViewer = viewer;
		}

		public void menuAboutToShow(IMenuManager manager) {
			if (fActionManager == null) {
				fActionManager = createNodeActionManager(fTreeViewer);
			}
			fActionManager.fillContextMenu(manager, fTreeViewer.getSelection());
		}

		public void release() {
			fTreeViewer = null;
			if (fActionManager != null) {
				fActionManager.setModel(null);
			}
		}
	}

	/**
	 * Toggle action for whether or not to display element's first attribute
	 */
	private class ToggleShowAttributeAction extends PropertyChangeUpdateAction {
		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
		private TreeViewer fTreeViewer;

		public ToggleShowAttributeAction(IPreferenceStore store, String preference, TreeViewer treeViewer) {
			super(XMLUIMessages.XMLContentOutlineConfiguration_0, store, preference, true);
			setToolTipText(getText());
			// images needed
			// setDisabledImageDescriptor(SYNCED_D);
			// (nsd) temporarily re-use Properties view image
			setImageDescriptor(EditorPluginImageHelper.getInstance().getImageDescriptor(EditorPluginImages.IMG_OBJ_PROP_PS));
			fTreeViewer = treeViewer;
			update();
		}

		public void update() {
			super.update();
			updateShowAttributes(isChecked(), fTreeViewer);
		}
	}

	private IContentProvider fContentProvider = null;

	protected ActionManagerMenuListener fContextMenuFiller = null;

	private ILabelProvider fLabelProvider = null;

	private TransferDragSourceListener[] fTransferDragSourceListeners;

	private TransferDropTargetListener[] fTransferDropTargetListeners;
	/*
	 * Preference key for Show Attributes
	 */
	private final String OUTLINE_SHOW_ATTRIBUTE_PREF = "outline-show-attribute-editor"; //$NON-NLS-1$

	private boolean fShowAttributes = false;

	public XMLContentOutlineConfiguration() {
		super();
	}

	protected IContributionItem[] createMenuContributions(TreeViewer viewer) {
		IContributionItem[] items;
		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
		IContributionItem showAttributeItem = new PropertyChangeUpdateActionContributionItem(new ToggleShowAttributeAction(getPreferenceStore(), OUTLINE_SHOW_ATTRIBUTE_PREF, viewer));
		items = super.createMenuContributions(viewer);
		if (items == null) {
			items = new IContributionItem[]{showAttributeItem};
		}
		else {
			IContributionItem[] combinedItems = new IContributionItem[items.length + 1];
			System.arraycopy(items, 0, combinedItems, 0, items.length);
			combinedItems[items.length] = showAttributeItem;
			items = combinedItems;
		}
		return items;
	}

	protected XMLNodeActionManager createNodeActionManager(TreeViewer treeViewer) {
		return new XMLNodeActionManager((IStructuredModel) treeViewer.getInput(), treeViewer);
	}

	public IContentProvider getContentProvider(TreeViewer viewer) {
		if (fContentProvider == null) {
			fContentProvider = new JFaceNodeContentProvider();
		}
		return fContentProvider;
	}

	private Object getFilteredNode(Object object) {
		if (object instanceof Node) {
			Node node = (Node) object;

			// replace attribute node in selection with its parent
			if (node.getNodeType() == Node.ATTRIBUTE_NODE)
				node = ((Attr) node).getOwnerElement();
			// replace TextNode in selection with its parent
			else if (node.getNodeType() == Node.TEXT_NODE)
				node = node.getParentNode();
			return node;
		}
		return object;
	}

	private Object[] getFilteredNodes(Object[] filteredNodes) {
		for (int i = 0; i < filteredNodes.length; i++) {
			filteredNodes[i] = getFilteredNode(filteredNodes[i]);
		}
		return filteredNodes;
	}

	/**
	 * @see org.eclipse.wst.sse.ui.internal.provisional.views.contentoutline.ContentOutlineConfiguration#getLabelProvider(org.eclipse.jface.viewers.TreeViewer)
	 */
	public ILabelProvider getLabelProvider(TreeViewer viewer) {
		if (fLabelProvider == null) {
			fLabelProvider = new JFaceNodeLabelProvider() {
				public String getText(Object o) {
					StringBuffer text = new StringBuffer(super.getText(o));
					if (o instanceof Node) {
						Node node = (Node) o;
						if (node.getNodeType() == Node.ELEMENT_NODE && fShowAttributes) {
							// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
							if (node.hasAttributes()) {
								Element element = (Element) node;
								NamedNodeMap attributes = element.getAttributes();
								Node idTypedAttribute = null;
								Node requiredAttribute = null;
								boolean hasId = false;
								boolean hasName = false;
								Node shownAttribute = null;

								// try to get content model element
								// declaration
								CMElementDeclaration elementDecl = null;
								ModelQuery mq = ModelQueryUtil.getModelQuery(element.getOwnerDocument());
								if (mq != null) {
									elementDecl = mq.getCMElementDeclaration(element);
								}
								// find an attribute of type (or just named)
								// ID
								if (elementDecl != null) {
									int i = 0;
									while (i < attributes.getLength() && idTypedAttribute == null) {
										Node attr = attributes.item(i);
										String attrName = attr.getNodeName();
										CMAttributeDeclaration attrDecl = (CMAttributeDeclaration) elementDecl.getAttributes().getNamedItem(attrName);
										if (attrDecl != null) {
											if ((attrDecl.getAttrType() != null) && (CMDataType.ID.equals(attrDecl.getAttrType().getDataTypeName()))) {
												idTypedAttribute = attr;
											}
											else if (attrDecl.getUsage() == CMAttributeDeclaration.REQUIRED && requiredAttribute == null) {
												// as a backup, keep tabs on
												// any required
												// attributes
												requiredAttribute = attr;
											}
											else {
												hasId = hasId || attrName.equals("id"); //$NON-NLS-1$
												hasName = hasName || attrName.equals("name"); //$NON-NLS-1$
											}
										}
										++i;
									}
								}

								/*
								 * If no suitable attribute was found, try
								 * using a required attribute, if none, then
								 * prefer "id" or "name", otherwise just use
								 * first attribute
								 */
								if (idTypedAttribute != null) {
									shownAttribute = idTypedAttribute;
								}
								else if (requiredAttribute != null) {
									shownAttribute = requiredAttribute;
								}
								else if (hasId) {
									shownAttribute = attributes.getNamedItem("id"); //$NON-NLS-1$
								}
								else if (hasName) {
									shownAttribute = attributes.getNamedItem("name"); //$NON-NLS-1$
								}
								if (shownAttribute == null) {
									shownAttribute = attributes.item(0);
								}

								// display the attribute
								String attributeName = shownAttribute.getNodeName();
								if (attributeName != null && attributeName.length() > 0) {
									text.append(" " + attributeName); //$NON-NLS-1$
									String attributeValue = shownAttribute.getNodeValue();
									if (attributeValue != null && attributeValue.length() > 0) {
										text.append("=" + StringUtils.strip(attributeValue)); //$NON-NLS-1$
									}
								}
							}
						}
					}
					return text.toString();
				}
			};
		}
		return fLabelProvider;
	}

	/**
	 * @see org.eclipse.wst.sse.ui.internal.provisional.views.contentoutline.ContentOutlineConfiguration#getMenuListener(org.eclipse.jface.viewers.TreeViewer)
	 */
	public IMenuListener getMenuListener(TreeViewer viewer) {
		if (fContextMenuFiller == null) {
			fContextMenuFiller = new ActionManagerMenuListener(viewer);
		}
		return fContextMenuFiller;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.sse.ui.views.contentoutline.StructuredContentOutlineConfiguration#getPreferenceStore()
	 */
	protected IPreferenceStore getPreferenceStore() {
		return XMLUIPlugin.getDefault().getPreferenceStore();
	}

	public ISelection getSelection(TreeViewer viewer, ISelection selection) {
		ISelection filteredSelection = selection;
		if (selection instanceof IStructuredSelection) {
			Object[] filteredNodes = getFilteredNodes(((IStructuredSelection) selection).toArray());
			filteredSelection = new StructuredSelection(filteredNodes);
		}
		return filteredSelection;
	}

	/**
	 * @see org.eclipse.wst.sse.ui.internal.provisional.views.contentoutline.ContentOutlineConfiguration#getTransferDragSourceListeners(org.eclipse.jface.viewers.TreeViewer)
	 */
	public TransferDragSourceListener[] getTransferDragSourceListeners(TreeViewer treeViewer) {
		if (fTransferDragSourceListeners == null) {
			// emulate the XMLDragAndDropManager
			final ViewerDragAdapter dragAdapter = new ViewerDragAdapter(treeViewer);
			fTransferDragSourceListeners = new TransferDragSourceListener[]{new TransferDragSourceListener() {
				public void dragFinished(DragSourceEvent event) {
					dragAdapter.dragFinished(event);
				}

				public void dragSetData(DragSourceEvent event) {
					dragAdapter.dragSetData(event);
				}

				public void dragStart(DragSourceEvent event) {
					dragAdapter.dragStart(event);
				}

				public Transfer getTransfer() {
					return ObjectTransfer.getInstance();
				}
			}};
		}

		return fTransferDragSourceListeners;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getTransferDropTargetListeners(org.eclipse.jface.viewers.TreeViewer)
	 */
	public TransferDropTargetListener[] getTransferDropTargetListeners(TreeViewer treeViewer) {
		if (fTransferDropTargetListeners == null) {
			// emulate the XMLDragAnDropManager
			final ViewerDropAdapter dropAdapter = new ViewerDropAdapter(treeViewer, new XMLDragAndDropManager());
			fTransferDropTargetListeners = new TransferDropTargetListener[]{new TransferDropTargetListener() {
				public void dragEnter(DropTargetEvent event) {
					dropAdapter.dragEnter(event);
				}

				public void dragLeave(DropTargetEvent event) {
					dropAdapter.dragLeave(event);
				}

				public void dragOperationChanged(DropTargetEvent event) {
					dropAdapter.dragOperationChanged(event);
				}

				public void dragOver(DropTargetEvent event) {
					dropAdapter.dragOver(event);
				}

				public void drop(DropTargetEvent event) {
					dropAdapter.drop(event);
				}

				public void dropAccept(DropTargetEvent event) {
					dropAdapter.dropAccept(event);
				}

				public Transfer getTransfer() {
					return ObjectTransfer.getInstance();
				}

				public boolean isEnabled(DropTargetEvent event) {
					return getTransfer().isSupportedType(event.currentDataType);
				}
			}};
		}
		return fTransferDropTargetListeners;
	}

	public void unconfigure(TreeViewer viewer) {
		super.unconfigure(viewer);
		fTransferDragSourceListeners = null;
		fTransferDropTargetListeners = null;
		if (fContextMenuFiller != null) {
			fContextMenuFiller.release();
			fContextMenuFiller = null;
		}
		// TODO: Add DnD support
		// XMLDragAndDropManager.addDragAndDropSupport(fTreeViewer);
	}

	/**
	 * Updates show attributes flag in JFaceNodeAdapter to indicate whether or
	 * not to show attributes in outline view. Also refreshes tree view due to
	 * label updates.
	 * 
	 * @param showAttr
	 * @param viewer
	 */
	void updateShowAttributes(boolean showAttr, TreeViewer viewer) {
		fShowAttributes = showAttr;
		// refresh the outline view
		viewer.refresh();
	}
}