/*******************************************************************************
 * Copyright (c) 2003, 2005 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.internal.wizard.page;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.ui.PlatformUI;
import org.eclipse.wst.server.core.*;
import org.eclipse.wst.server.ui.ServerUICore;
import org.eclipse.wst.server.ui.internal.*;
import org.eclipse.wst.server.ui.internal.view.servers.ModuleServer;
import org.eclipse.wst.server.ui.wizard.IWizardHandle;
/**
 * A wizard page used to add and remove modules.
 */
public class ModifyModulesComposite extends Composite {
	protected IWizardHandle wizard;

	protected IServerAttributes server;

	protected Map childModuleMap = new HashMap();
	protected Map parentModuleMap = new HashMap();

	// original modules on the server
	protected List originalModules = new ArrayList();

	// modules available to be added to the server
	protected List modules = new ArrayList();

	// current modules on the server
	protected List deployed = new ArrayList();

	protected TreeViewer availableTreeViewer;
	protected TreeViewer deployedTreeViewer;

	protected Button add, addAll;
	protected Button remove, removeAll;

	protected TaskModel taskModel;

	// a module that must be kept on the server
	protected IModule requiredModule;

	// the parent modules of the above modules. at least one of these modules
	// must be kept on the server
	protected IModule[] requiredModules;

	protected Map errorMap;

	abstract class TreeContentProvider implements ITreeContentProvider {
		public void dispose() {
			// do nothing
		}

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
			// do nothing
		}
		
		public Object[] getChildren(Object parentElement) {
			ModuleServer ms = (ModuleServer) parentElement;
			IModule[] parent = ms.module;
			IModule[] children = (IModule[]) childModuleMap.get(new ChildModuleMapKey(parent));
			
			List list = new ArrayList();
			if (children != null) {
				int size = children.length;
				for (int i = 0; i < size; i++) {
					IModule child = children[i];
					
					parentModuleMap.put(child, parent);
					
					int size2 = parent.length;
					IModule[] module2 = new IModule[size2 + 1];
					System.arraycopy(parent, 0, module2, 0, size2);
					module2[size2] = child;
					list.add(new ModuleServer(null, module2));
				}
			}
			return list.toArray();
		}

		public Object getParent(Object element) {
			ModuleServer ms = (ModuleServer) element;
			IModule[] child = ms.module;
			IModule[] modules2 = (IModule[]) parentModuleMap.get(child);
			if (modules2 == null)
				return null;
			return new ModuleServer(null, modules2);
		}

		public boolean hasChildren(Object element) {
			ModuleServer ms = (ModuleServer) element;
			IModule[] parent = ms.module;
			IModule[] children = (IModule[]) childModuleMap.get(new ChildModuleMapKey(parent));
			return (children != null && children.length > 0);
		}
	}

	class AvailableContentProvider extends TreeContentProvider {
		public Object[] getElements(Object inputElement) {
			List list = new ArrayList();
			Iterator iterator = modules.iterator();
			while (iterator.hasNext()) {
				IModule module = (IModule) iterator.next();
				list.add(new ModuleServer(null, new IModule[] { module }));
			}
			return list.toArray();
		}
	}

	class DeployedContentProvider extends TreeContentProvider {
		public Object[] getElements(Object inputElement) {
			List list = new ArrayList();
			Iterator iterator = deployed.iterator();
			while (iterator.hasNext()) {
				IModule module = (IModule) iterator.next();
				list.add(new ModuleServer(null, new IModule[] { module }));
			}
			return list.toArray();
		}
	}

	/**
	 * The key element for the child module map
	 * ChildMapModuleKey
	 */
	protected class ChildModuleMapKey {
		protected IModule[] moduleTree;
		
		protected ChildModuleMapKey(IModule curModule) {
			if (curModule != null) {
				moduleTree = new IModule[] { curModule };
			}
		}
		
		protected ChildModuleMapKey(IModule[] curModuleTree) {
			moduleTree = curModuleTree;
		}
		
		public boolean equals(Object obj) {
			if (obj == this) // same object
				return true;
			
			if (!(obj instanceof ChildModuleMapKey))
				return false;
				
			IModule[] curCompareModule = ((ChildModuleMapKey) obj).moduleTree;
			if (curCompareModule == moduleTree) {
				// the module tree is the same
				return true;
			} else if (moduleTree == null || curCompareModule == null || moduleTree.length != curCompareModule.length){
				return false;
			} else {
				// compare each module
				for (int i = 0; i < curCompareModule.length; i++) {
					if (!curCompareModule[i].equals(moduleTree[i]))
						return false;
				}
				return true;
			}
		}

		public int hashCode() {
			// force the same hash code on all the instances to makes sure the
			// equals(Object) method is being used for comparing the objects
			return 12345;
		}
	}

	/**
	 * Create a new ModifyModulesComposite.
	 * 
	 * @param parent a parent composite
	 * @param wizard a wizard
	 * @param module the module that is being added
	 */
	public ModifyModulesComposite(Composite parent, IWizardHandle wizard, IModule module) {
		super(parent, SWT.NONE);
		this.wizard = wizard;
		requiredModule = module;
		
		wizard.setTitle(Messages.wizModuleTitle);
		wizard.setDescription(Messages.wizModuleDescription);
		wizard.setImageDescriptor(ImageResource.getImageDescriptor(ImageResource.IMG_WIZBAN_SELECT_SERVER));
		
		createControl();
	}

	public void setServer(IServerAttributes server) {
		if (server == this.server)
			return;

		this.server = server;
		originalModules = new ArrayList();
		deployed = new ArrayList();
		modules = new ArrayList();
		
		childModuleMap = new HashMap();
		
		if (server == null)
			return;

		// get currently deployed modules
		IModule[] currentModules = server.getModules();
		if (currentModules != null) {
			int size = currentModules.length;
			for (int i = 0; i < size; i++) {
				originalModules.add(currentModules[i]);
				deployed.add(currentModules[i]);
			}
		}
		
		// add new module
		requiredModules = null;
		errorMap = new HashMap();
		if (requiredModule != null) {
			try {
				IModule[] parents = server.getRootModules(requiredModule, null);
				if (parents != null && parents.length > 0)
					requiredModules = parents;
				else
					requiredModules = new IModule[] { requiredModule };
			} catch (CoreException ce) {
				// ignore
				//errorMap.put(newModule, ce.getStatus());
			} catch (Exception e) {
				Trace.trace(Trace.WARNING, "Could not find root module", e);
			}
		}
		if (requiredModules != null && !deployed.contains(requiredModules[0]))
			deployed.add(requiredModules[0]);

		// get remaining modules
		IModule[] modules2 = ServerUtil.getModules(server.getServerType().getRuntimeType().getModuleTypes());
		if (modules2 != null) {
			int size = modules2.length;
			for (int i = 0; i < size; i++) {
				IModule module = modules2[i];
				if (!deployed.contains(module)) {
					try {
						IModule[] parents = server.getRootModules(module, null);
						if (parents != null) {
							int size2 = parents.length;
							for (int j = 0; j < size2; j++) {
								if (parents[j].equals(module)) {
									IStatus status = server.canModifyModules(new IModule[] { module }, null, null);
									if (status != null && !status.isOK())
										errorMap.put(module, status);
									modules.add(module);
								}
							}
						}
					} catch (CoreException ce) {
						errorMap.put(module, ce.getStatus());
						modules.add(module);
					}
				}
			}
		}

		// build child map
		Iterator iterator = deployed.iterator();
		while (iterator.hasNext()) {
			IModule module = (IModule) iterator.next();
			try {
				IModule[] children = server.getChildModules(new IModule[] { module }, null);
				if (children != null && children.length > 0)
					childModuleMap.put(new ChildModuleMapKey(module), children);
			} catch (Exception e) {
				// ignore
			}
		}
		
		iterator = modules.iterator();
		while (iterator.hasNext()) {
			IModule module = (IModule) iterator.next();
			try {
				IModule[] children = server.getChildModules(new IModule[] { module }, null);
				if (children != null && children.length > 0)
					childModuleMap.put(new ChildModuleMapKey(module), children);
			} catch (Exception e) {
				// ignore
			}
		}
		
		// get children recursively one level
		// put child elements into a different list to avoid concurrent modifications
		iterator = childModuleMap.keySet().iterator();
		List list = new ArrayList();
		while (iterator.hasNext()) {
			list.add(iterator.next());
		}
		
		iterator = list.iterator();
		while (iterator.hasNext()) {
			ChildModuleMapKey key = (ChildModuleMapKey) iterator.next();
			IModule[] children0 = (IModule[]) childModuleMap.get(key);
			if (children0 != null) {
				int size = children0.length;
				for (int i = 0; i < size; i++) {
					int size2 = key.moduleTree.length;
					IModule[] module2 = new IModule[size2 + 1];
					System.arraycopy(key.moduleTree, 0, module2, 0, size2);
					module2[size2] = children0[i];
					
					try {
						IModule[] children = server.getChildModules(module2, null);
						if (children != null && children.length > 0)
							childModuleMap.put(new ChildModuleMapKey(module2), children);
					} catch (Exception e) {
						// ignore
					}
				}
			}
		}
		
		if (availableTreeViewer != null)
			Display.getDefault().syncExec(new Runnable() {
				public void run() {
					try { // update trees if we can
						availableTreeViewer.refresh();
						deployedTreeViewer.refresh();
						setEnablement();
					} catch (Exception e) {
						// ignore
					}
				}
			});
		updateTaskModel();
	}
	
	public void setTaskModel(TaskModel model) {
		this.taskModel = model;
	}

	/**
	 * Creates the UI of the page.
	 */
	protected void createControl() {
		GridLayout layout = new GridLayout();
		layout.horizontalSpacing = SWTUtil.convertHorizontalDLUsToPixels(this, 4);
		layout.verticalSpacing = SWTUtil.convertVerticalDLUsToPixels(this, 4);
		layout.numColumns = 3;
		setLayout(layout);
		setFont(getParent().getFont());
		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, ContextIds.MODIFY_MODULES_COMPOSITE);

		Label label = new Label(this, SWT.NONE);
		GridData data = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING);
		data.horizontalSpan = 3;
		label.setLayoutData(data);
		label.setText(Messages.wizModuleMessage);

		label = new Label(this, SWT.NONE);
		label.setText(Messages.wizModuleAvailableList);
		
		label = new Label(this, SWT.NONE);
		label.setText("");
		
		label = new Label(this, SWT.NONE);
		label.setText(Messages.wizModuleDeployedList);
		
		Tree availableTree = new Tree(this, SWT.BORDER);
		data = new GridData(GridData.FILL_BOTH);
		data.heightHint = 200;
		data.widthHint = 150;
		availableTree.setLayoutData(data);
		
		availableTreeViewer = new TreeViewer(availableTree);
		ILabelProvider labelProvider = ServerUICore.getLabelProvider();
		labelProvider.addListener(new ILabelProviderListener() {
			public void labelProviderChanged(LabelProviderChangedEvent event) {
				Object[] obj = event.getElements();
				if (obj == null)
					availableTreeViewer.refresh(true);
				else {
					int size = obj.length;
					for (int i = 0; i < size; i++)
						availableTreeViewer.refresh(obj[i], true);
				}
			}
		});
		availableTreeViewer.setLabelProvider(labelProvider);
		availableTreeViewer.setContentProvider(new AvailableContentProvider());
		availableTreeViewer.setSorter(new ViewerSorter());
		availableTreeViewer.setInput("root");
		
		availableTreeViewer.addSelectionChangedListener(new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				setEnablement();
			}
		});
		availableTreeViewer.addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				setEnablement();
				if (add.isEnabled())
					add(false);
			}
		});
		
		// slosh buttons
		Composite comp = new Composite(this, SWT.NONE);
		data = new GridData(GridData.FILL_BOTH);
		data.widthHint = 120;
		comp.setLayoutData(data);
		
		layout = new GridLayout();
		layout.marginWidth = 5;
		layout.marginHeight = 25;
		layout.verticalSpacing = 20;
		comp.setLayout(layout);
		
		add = new Button(comp, SWT.PUSH);
		add.setText(Messages.wizModuleAdd);
		add.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		add.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				add(false);
			}
		});
		
		remove = new Button(comp, SWT.PUSH);
		remove.setText(Messages.wizModuleRemove);
		remove.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		remove.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				remove(false);
			}
		});
		
		label = new Label(comp, SWT.NONE);
		label.setText("");
		
		addAll = new Button(comp, SWT.PUSH);
		addAll.setText(Messages.wizModuleAddAll);
		addAll.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		addAll.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				add(true);
			}
		});
		
		removeAll = new Button(comp, SWT.PUSH);
		removeAll.setText(Messages.wizModuleRemoveAll);
		removeAll.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		removeAll.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				remove(true);
			}
		});
		
		Tree deployedTree = new Tree(this, SWT.BORDER);
		data = new GridData(GridData.FILL_BOTH);
		data.widthHint = 150;
		deployedTree.setLayoutData(data);
		
		deployedTreeViewer = new TreeViewer(deployedTree);
		labelProvider = ServerUICore.getLabelProvider();
		labelProvider.addListener(new ILabelProviderListener() {
			public void labelProviderChanged(LabelProviderChangedEvent event) {
				Object[] obj = event.getElements();
				if (obj == null)
					deployedTreeViewer.refresh(true);
				else {
					int size = obj.length;
					for (int i = 0; i < size; i++)
						deployedTreeViewer.refresh(obj[i], true);
				}
			}
		});
		deployedTreeViewer.setLabelProvider(labelProvider);
		deployedTreeViewer.setContentProvider(new DeployedContentProvider());
		deployedTreeViewer.setSorter(new ViewerSorter());
		deployedTreeViewer.setInput("root");
		
		deployedTreeViewer.addSelectionChangedListener(new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				setEnablement();
			}
		});
		deployedTreeViewer.addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				setEnablement();
				if (remove.isEnabled())
					remove(false);
			}
		});
		
		setEnablement();
		availableTree.setFocus();
		
		Dialog.applyDialogFont(this);
	}

	protected IModule getAvailableSelection() {
		IStructuredSelection sel = (IStructuredSelection) availableTreeViewer.getSelection();
		return getModule((ModuleServer) sel.getFirstElement());
	}

	protected IModule getDeployedSelection() {
		IStructuredSelection sel = (IStructuredSelection) deployedTreeViewer.getSelection();
		return getModule((ModuleServer) sel.getFirstElement());
	}

	protected static IModule getModule(ModuleServer ms) {
		if (ms == null)
			return null;
		IModule[] modules2 = ms.module;
		return modules2[modules2.length - 1];
	}

	protected void setEnablement() {
		boolean enabled = false;
		wizard.setMessage(null, IMessageProvider.NONE);
		
		IModule module = getAvailableSelection();		
		if (module != null) {
			try {
				IStatus status = (IStatus) errorMap.get(module);
				if (modules.contains(module)) {
					if (status == null)
						enabled = true;
					else if (status.getSeverity() == IStatus.ERROR)
						wizard.setMessage(status.getMessage(), IMessageProvider.ERROR);
					else if (status.getSeverity() == IStatus.WARNING)
						wizard.setMessage(status.getMessage(), IMessageProvider.WARNING);
					else if (status.getSeverity() == IStatus.INFO)
						wizard.setMessage(status.getMessage(), IMessageProvider.INFORMATION);
				}
			} catch (Exception e) {
				// ignore
			}
		}
		
		add.setEnabled(enabled);
		addAll.setEnabled(modules.size() > 0);
		
		enabled = false;
		module = getDeployedSelection();
		if (module != null && deployed.contains(module)) {
			try {
				int count = 0;
				boolean found = false;
				if (requiredModules != null) {
					// count how many of newModule are deployed
					int size = requiredModules.length;
					for (int i = 0; i < size; i++) {
						if (deployed.contains(requiredModules[i]))
							count++;
						if (module.equals(requiredModules[i]))
							found = true;
					}
					if (count > 1 || !found)
						enabled = true;
				} else {
					enabled = true;
				}
			} catch (Exception e) {
				// ignore
			}
		}
		remove.setEnabled(enabled);
		if (requiredModules == null)
			removeAll.setEnabled(deployed.size() > 0);
		else
			removeAll.setEnabled(deployed.size() > 1);
	}

	protected void add(boolean all) {
		if (all) {
			IModule[] modules2 = new IModule[modules.size()];
			modules.toArray(modules2);
			moveAll(modules2, true);
		} else
			moveAll(new IModule[] { getAvailableSelection() }, true);
		updateTaskModel();
	}

	protected void remove(boolean all) {
		if (all) {
			// pick one of the required modules to keep
			IModule keep = null;
			if (requiredModules != null) {
				int size2 = requiredModules.length;
				for (int i = 0; i < size2; i++) {
					if (keep == null && deployed.contains(requiredModules[i]))
						keep = requiredModules[i];
				}
			}
			
			List list = new ArrayList();
			list.addAll(deployed);
			list.remove(keep);
			
			IModule[] modules2 = new IModule[list.size()];
			list.toArray(modules2);
			
			moveAll(modules2, false);
		} else
			moveAll(new IModule[] { getDeployedSelection() }, false);
		updateTaskModel();
	}

	protected void moveAll(IModule[] mods, boolean add2) {
		int size = mods.length;
		List list = new ArrayList();
		for (int i = 0; i < size; i++) {
			IStatus status = (IStatus) errorMap.get(mods[i]);
			
			if (status == null && !list.contains(mods[i]))
				list.add(mods[i]);
		}
		
		Iterator iterator = list.iterator();
		while (iterator.hasNext()) {
			IModule module = (IModule) iterator.next();
			if (add2) {
				modules.remove(module);
				deployed.add(module);
			} else {
				modules.add(module);
				deployed.remove(module);
			}
		}
		
		availableTreeViewer.refresh();
		deployedTreeViewer.refresh();

		setEnablement();
	}

	protected void updateTaskModel() {
		if (taskModel == null)
			return;

		taskModel.putObject(TaskModel.TASK_MODULES, getModuleMap());
		wizard.update();
	}

	public List getModulesToRemove() {
		List list = new ArrayList();
		Iterator iterator = originalModules.iterator();
		while (iterator.hasNext()) {
			IModule module = (IModule) iterator.next();
			if (!deployed.contains(module))
				list.add(module);
		}
		return list;
	}

	public List getModulesToAdd() {
		List list = new ArrayList();
		Iterator iterator = deployed.iterator();
		while (iterator.hasNext()) {
			IModule module = (IModule) iterator.next();
			if (!originalModules.contains(module))
				list.add(module);
		}
		return list;
	}
	
	private void addChildMap(List map, IModule[] parents, IModule[] children) {
		if (children == null)
			return;
		
		int size = children.length;
		for (int i = 0; i < size; i++) {
			IModule module = children[i];
			
			int size2 = parents.length;
			IModule[] modules2 = new IModule[size2 + 1];
			System.arraycopy(parents, 0, modules2, 0, size2);
			modules2[size2] = module;
			map.add(modules2);
			
			IModule[] children2 = (IModule[]) childModuleMap.get(new ChildModuleMapKey(module));
			if (children2 != null)
				addChildMap(map, modules2, children2);
		}
	}

	public List getModuleMap() {
		final List map = new ArrayList();
	
		Iterator iterator = deployed.iterator();
		while (iterator.hasNext()) {
			IModule module = (IModule) iterator.next();
			IModule[] moduleTree = new IModule[] { module };
			map.add(moduleTree);
			IModule[] children = (IModule[]) childModuleMap.get(new ChildModuleMapKey(module));
			if (children != null)
				addChildMap(map, moduleTree, children);
		}
		
		return map;
	}
}