/*
 * Copyright (c) 2014, 2015 Eike Stepper (Berlin, Germany) 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:
 *    Eike Stepper - initial API and implementation
 */
package org.eclipse.oomph.projectconfig.provider;

import org.eclipse.oomph.base.provider.ModelElementItemProvider;
import org.eclipse.oomph.predicates.AndPredicate;
import org.eclipse.oomph.predicates.NamePredicate;
import org.eclipse.oomph.predicates.NaturePredicate;
import org.eclipse.oomph.predicates.PredicatesFactory;
import org.eclipse.oomph.predicates.RepositoryPredicate;
import org.eclipse.oomph.preferences.PreferenceNode;
import org.eclipse.oomph.preferences.PreferencesFactory;
import org.eclipse.oomph.preferences.Property;
import org.eclipse.oomph.projectconfig.ExclusionPredicate;
import org.eclipse.oomph.projectconfig.InclusionPredicate;
import org.eclipse.oomph.projectconfig.PreferenceFilter;
import org.eclipse.oomph.projectconfig.PreferenceProfile;
import org.eclipse.oomph.projectconfig.Project;
import org.eclipse.oomph.projectconfig.ProjectConfigFactory;
import org.eclipse.oomph.projectconfig.ProjectConfigPackage;
import org.eclipse.oomph.projectconfig.WorkspaceConfiguration;
import org.eclipse.oomph.projectconfig.util.ProjectConfigUtil;

import org.eclipse.emf.common.CommonPlugin;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CompoundCommand;
import org.eclipse.emf.common.command.IdentityCommand;
import org.eclipse.emf.common.command.UnexecutableCommand;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.util.ECollections;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.ResourceLocator;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.edit.EMFEditPlugin;
import org.eclipse.emf.edit.command.AddCommand;
import org.eclipse.emf.edit.command.CommandParameter;
import org.eclipse.emf.edit.command.CreateChildCommand;
import org.eclipse.emf.edit.command.DragAndDropCommand;
import org.eclipse.emf.edit.command.DragAndDropCommand.Detail;
import org.eclipse.emf.edit.command.DragAndDropFeedback;
import org.eclipse.emf.edit.command.RemoveCommand;
import org.eclipse.emf.edit.command.SetCommand;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.provider.ComposeableAdapterFactory;
import org.eclipse.emf.edit.provider.ComposedImage;
import org.eclipse.emf.edit.provider.DelegatingWrapperItemProvider;
import org.eclipse.emf.edit.provider.IEditingDomainItemProvider;
import org.eclipse.emf.edit.provider.IItemLabelProvider;
import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
import org.eclipse.emf.edit.provider.IViewerNotification;
import org.eclipse.emf.edit.provider.IWrapperItemProvider;
import org.eclipse.emf.edit.provider.ItemPropertyDescriptor;
import org.eclipse.emf.edit.provider.ItemProvider;
import org.eclipse.emf.edit.provider.ViewerNotification;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

/**
 * This is the item provider adapter for a {@link org.eclipse.oomph.projectconfig.Project} object.
 * <!-- begin-user-doc -->
 * <!-- end-user-doc -->
 * @generated
 */
public class ProjectItemProvider extends ModelElementItemProvider
{
  private static final IWorkspaceRoot WORKSPACE_ROOT = ResourcesPlugin.getWorkspace().getRoot();

  private static final Class<?> IWORKBENCH_ADAPTER_CLASS;

  private static final Method GET_IMAGE_DESCRIPTOR_METHOD;

  static
  {
    Class<?> workbenchAdapterClass = null;
    Method method = null;

    try
    {
      workbenchAdapterClass = CommonPlugin.loadClass("org.eclipse.ui.ide", "org.eclipse.ui.model.IWorkbenchAdapter");
      method = workbenchAdapterClass.getMethod("getImageDescriptor", Object.class);
    }
    catch (Throwable throwable)
    {
      // Ignore
    }

    IWORKBENCH_ADAPTER_CLASS = workbenchAdapterClass;
    GET_IMAGE_DESCRIPTOR_METHOD = method;
  }

  // private static final Pattern PROJECT_ENCODING_PROPERTY_PATTERN = Pattern.compile("<project>");

  /**
   * This constructs an instance from a factory and a notifier.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public ProjectItemProvider(AdapterFactory adapterFactory)
  {
    super(adapterFactory);
  }

  /**
   * This returns the property descriptors for the adapted class.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public List<IItemPropertyDescriptor> getPropertyDescriptors(Object object)
  {
    if (itemPropertyDescriptors == null)
    {
      super.getPropertyDescriptors(object);

      addPreferenceNodePropertyDescriptor(object);
      addPreferenceProfileReferencesPropertyDescriptor(object);
    }
    return itemPropertyDescriptors;
  }

  /**
   * This adds a property descriptor for the Preference Node feature.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected void addPreferenceNodePropertyDescriptor(Object object)
  {
    itemPropertyDescriptors.add(createItemPropertyDescriptor(((ComposeableAdapterFactory)adapterFactory).getRootAdapterFactory(), getResourceLocator(),
        getString("_UI_Project_preferenceNode_feature"),
        getString("_UI_PropertyDescriptor_description", "_UI_Project_preferenceNode_feature", "_UI_Project_type"),
        ProjectConfigPackage.Literals.PROJECT__PREFERENCE_NODE, true, false, true, null, null, null));
  }

  /**
   * This adds a property descriptor for the Preference Profile References feature.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated NOT
   */
  protected void addPreferenceProfileReferencesPropertyDescriptor(Object object)
  {
    itemPropertyDescriptors.add(new ItemPropertyDescriptor(((ComposeableAdapterFactory)adapterFactory).getRootAdapterFactory(), getResourceLocator(),
        getString("_UI_Project_preferenceProfileReferences_feature"),
        getString("_UI_PropertyDescriptor_description", "_UI_Project_preferenceProfileReferences_feature", "_UI_Project_type"),
        ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILE_REFERENCES, true, false, true, null, null, null)
    {
      IItemLabelProvider labelProvider = new IItemLabelProvider()
      {
        public String getText(Object object)
        {
          String result = itemDelegator.getText(object);
          if (object instanceof PreferenceProfile)
          {
            PreferenceProfile preferenceProfile = (PreferenceProfile)object;
            Project project = preferenceProfile.getProject();
            if (project != null)
            {
              PreferenceNode preferenceNode = project.getPreferenceNode();
              if (preferenceNode != null)
              {
                String name = preferenceNode.getName();
                if (name != null)
                {
                  result += " - " + name;
                }
              }
            }
          }
          return result;
        }

        public Object getImage(Object object)
        {
          return itemDelegator.getImage(object);
        }
      };

      @Override
      public IItemLabelProvider getLabelProvider(Object object)
      {
        return labelProvider;
      }

    });
  }

  /**
   * This specifies how to implement {@link #getChildren} and is used to deduce an appropriate feature for an
   * {@link org.eclipse.emf.edit.command.AddCommand}, {@link org.eclipse.emf.edit.command.RemoveCommand} or
   * {@link org.eclipse.emf.edit.command.MoveCommand} in {@link #createCommand}.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public Collection<? extends EStructuralFeature> getChildrenFeatures(Object object)
  {
    if (childrenFeatures == null)
    {
      super.getChildrenFeatures(object);
      childrenFeatures.add(ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILES);
    }
    return childrenFeatures;
  }

  /**
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  protected EStructuralFeature getChildFeature(Object object, Object child)
  {
    // Check the type of the specified child object and return the proper feature to use for
    // adding (see {@link AddCommand}) it as a child.

    return super.getChildFeature(object, child);
  }

  /**
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public boolean hasChildren(Object object)
  {
    return hasChildren(object, false);
  }

  /**
   * This returns Project.gif.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated NOT
   */
  @Override
  public Object getImage(Object object)
  {
    Project project = (Project)object;
    PreferenceNode preferenceNode = project.getPreferenceNode();
    if (preferenceNode != null)
    {
      String name = preferenceNode.getName();
      if (name != null)
      {
        IProject iProject = WORKSPACE_ROOT.getProject(name);
        try
        {
          Object adapter = iProject.getAdapter(IWORKBENCH_ADAPTER_CLASS);
          if (adapter != null)
          {
            return GET_IMAGE_DESCRIPTOR_METHOD.invoke(adapter, iProject);
          }
        }
        catch (Throwable throwable)
        {
          // Ignore
        }
      }
    }

    return overlayImage(object, getResourceLocator().getImage("full/obj16/Project"));
  }

  /**
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  protected boolean shouldComposeCreationImage()
  {
    return true;
  }

  /**
   * This returns the label text for the adapted class.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated NOT
   */
  @Override
  public String getText(Object object)
  {
    Project project = (Project)object;
    PreferenceNode preferenceNode = project.getPreferenceNode();
    String label = "<invalid>";
    if (preferenceNode != null)
    {
      String name = preferenceNode.getName();
      if (name != null)
      {
        label = name;
      }
    }
    return label;
  }

  /**
   * This handles model notifications by calling {@link #updateChildren} to update any cached
   * children and by creating a viewer notification, which it passes to {@link #fireNotifyChanged}.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public void notifyChanged(Notification notification)
  {
    updateChildren(notification);

    switch (notification.getFeatureID(Project.class))
    {
      case ProjectConfigPackage.PROJECT__PREFERENCE_PROFILES:
        fireNotifyChanged(new ViewerNotification(notification, notification.getNotifier(), true, false));
        return;
    }
    super.notifyChanged(notification);
  }

  /**
   * This handles model notifications by calling {@link #updateChildren} to update any cached
   * children and by creating a viewer notification, which it passes to {@link #fireNotifyChanged}.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated NOT
   */
  public void notifyChangedFoo(Notification notification)
  {
    updateChildren(notification);

    switch (notification.getFeatureID(Project.class))
    {
      case ProjectConfigPackage.PROJECT__PREFERENCE_PROFILE_REFERENCES:
      case ProjectConfigPackage.PROJECT__PREFERENCE_PROFILES:
        fireNotifyChanged(new ViewerNotification(notification, notification.getNotifier(), true, true));
        return;
    }
    super.notifyChanged(notification);
  }

  private class References extends ItemProvider implements IEditingDomainItemProvider
  {
    Project project;

    public References(AdapterFactory adapterFactory, String text, Object image, Project project)
    {
      super(adapterFactory, text, image, project);
      this.project = project;
    }

    Map<PreferenceProfile, IWrapperItemProvider> wrappers = new HashMap<PreferenceProfile, IWrapperItemProvider>();

    public void update()
    {
      /*
       * for (Object child : getChildren()) { ((IDisposable)child).dispose(); }
       */
      List<Object> children = new ArrayList<Object>();
      EList<PreferenceProfile> referentProjects = project.getPreferenceProfileReferences();
      for (int i = 0, size = referentProjects.size(); i < size; ++i)
      {
        PreferenceProfile project = referentProjects.get(i);
        IWrapperItemProvider wrapper = wrap(i, project);
        children.add(wrapper);
      }
      ECollections.setEList(getChildren(), children);
    }

    private IWrapperItemProvider wrap(int i, PreferenceProfile preferenceProfile)
    {
      IWrapperItemProvider wrapper = wrappers.get(preferenceProfile);
      if (wrapper == null)
      {
        wrapper = new DelegatingWrapperItemProvider(preferenceProfile, project, ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILE_REFERENCES, i,
            adapterFactory)
        {
          @Override
          public Object getParent(Object object)
          {
            return References.this;
          }

          @Override
          public String getText(Object object)
          {
            String result = super.getText(object);
            PreferenceProfile preferenceProfile = (PreferenceProfile)value;
            Project project = preferenceProfile.getProject();
            if (project != null)
            {
              PreferenceNode preferenceNode = project.getPreferenceNode();
              if (preferenceNode != null)
              {
                String name = preferenceNode.getName();
                if (name != null)
                {
                  result += " - " + name;
                }
              }
            }
            return result;
          }

          @Override
          public Object getImage(Object object)
          {
            Object image = super.getImage(object);
            List<Object> images = new ArrayList<Object>(2);
            images.add(image);
            images.add(EMFEditPlugin.INSTANCE.getImage("full/ovr16/ControlledObject"));
            return image = new ComposedImage(images);
          }

          @Override
          public boolean hasChildren(Object object)
          {
            return false;
          }

          @Override
          public Collection<?> getChildren(Object object)
          {
            return Collections.emptyList();
          }

          @Override
          public void notifyChanged(Notification notification)
          {
            if (notification instanceof IViewerNotification && ((IViewerNotification)notification).isLabelUpdate())
            {
              super.notifyChanged(notification);
            }
          }
        };
        wrappers.put(preferenceProfile, wrapper);
      }
      else
      {
        wrapper.setIndex(i);
      }
      return wrapper;
    }

    @Override
    public Command createCommand(Object object, EditingDomain editingDomain, Class<? extends Command> commandClass, CommandParameter commandParameter)
    {
      final Collection<?> originalCollection = commandParameter.getCollection();
      commandParameter = unwrapCommandValues(commandParameter, commandClass);
      Collection<?> collection = commandParameter.getCollection();
      if (commandClass == RemoveCommand.class)
      {
        if (project.getPreferenceProfileReferences().containsAll(collection))
        {
          return new RemoveCommand(editingDomain, project, ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILE_REFERENCES, collection)
          {
            @Override
            public void doExecute()
            {
              super.doExecute();
              update();
              affectedObjects = Collections.singleton(References.this);
            }

            @Override
            public void doUndo()
            {
              super.doUndo();
              update();
              affectedObjects = Collections.singleton(References.this);
            }

            @Override
            public void doRedo()
            {
              super.doRedo();
              update();
              affectedObjects = Collections.singleton(References.this);
            }
          };
        }
      }
      else if (commandClass == AddCommand.class && collection != null)
      {
        final Collection<Object> wrappers = new ArrayList<Object>();
        for (Object value : collection)
        {
          if (value instanceof PreferenceProfile)
          {
            wrappers.add(wrap(-1, (PreferenceProfile)value));
          }
          else
          {
            return UnexecutableCommand.INSTANCE;
          }
        }
        return new AddCommand(editingDomain, project, ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILE_REFERENCES, collection)
        {
          @Override
          public void doExecute()
          {
            super.doExecute();
            update();
            affectedObjects = wrappers;
          }

          @Override
          public void doUndo()
          {
            super.doUndo();
            update();
            affectedObjects = Collections.singleton(References.this);
          }

          @Override
          public void doRedo()
          {
            super.doRedo();
            update();
            affectedObjects = wrappers;
          }
        };
      }
      else if (commandClass == DragAndDropCommand.class)
      {
        DragAndDropCommand.Detail detail = (DragAndDropCommand.Detail)commandParameter.getFeature();
        return new DragAndDropCommand(editingDomain, this, detail.location, detail.operations, detail.operation, commandParameter.getCollection())
        {
          @Override
          protected boolean prepareDropLinkOn()
          {
            dragCommand = IdentityCommand.INSTANCE;
            dropCommand = AddCommand.create(domain, References.this, ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILE_REFERENCES, originalCollection);
            return dropCommand.canExecute();
          }
        };
      }
      return super.createCommand(object, editingDomain, commandClass, commandParameter);
    }
  }

  /*
   * @Override public Command createCommand(Object object, EditingDomain domain, Class<? extends Command> commandClass, CommandParameter commandParameter) {
   * Collection<?> collection = commandParameter.getCollection(); if (collection != null) { for (Object value : collection) { if (value instanceof
   * PreferenceProfile) { return referents.createCommand(referents, domain, commandClass, commandParameter); } } } return super.createCommand(object, domain,
   * commandClass, commandParameter); }
   */

  private References references;

  @Override
  public Collection<?> getChildren(Object object)
  {
    Collection<Object> result = new ArrayList<Object>(super.getChildren(object));
    Project project = (Project)object;
    if (references == null)
    {
      references = new References(adapterFactory, "References", getResourceLocator().getImage("full/obj16/OutgoingLinks"), project);
    }
    references.update();
    result.add(references);
    return result;
  }

  @Override
  protected Command createPrimaryDragAndDropCommand(EditingDomain domain, Object owner, float location, int operations, int operation, Collection<?> collection)
  {
    if (operation == DragAndDropFeedback.DROP_LINK)
    {
      return references.createCommand(references, domain, DragAndDropCommand.class,
          new CommandParameter(references, new Detail(location, operations, operation), collection));
    }
    return super.createPrimaryDragAndDropCommand(domain, owner, location, operations, operation, collection);
  }

  private static final Set<String> IGNORE_NAME_COMPONENTS = new HashSet<String>(Arrays.asList(new String[] { "org", "eclipse", "com" }));

  private static final Map<String, String> ACRYONYMS = new HashMap<String, String>();

  static
  {
    ACRYONYMS.put("jdt", "JDT");
    ACRYONYMS.put("pde", "PDE");
    ACRYONYMS.put("ui", "UI");
    ACRYONYMS.put("api", "API");
    ACRYONYMS.put("ltk", "LTK");
    ACRYONYMS.put("gmf", "GMF");
  }

  private String[] getRootComponents(PreferenceNode preferenceNode, StringBuilder qualifiedPreferenceNodeName)
  {
    String[] rootNameComponents = null;
    for (String preferenceNodeName : preferenceNode.getRelativePath().segments())
    {
      String[] nameComponents = URI.decode(preferenceNodeName).split("\\.");

      int start = 0;
      if (rootNameComponents == null)
      {
        rootNameComponents = nameComponents;

        while (start < nameComponents.length)
        {
          if (!IGNORE_NAME_COMPONENTS.contains(nameComponents[start]))
          {
            break;
          }
          ++start;
        }
      }

      for (int j = start; j < nameComponents.length; ++j)
      {
        if (qualifiedPreferenceNodeName.length() > 0)
        {
          qualifiedPreferenceNodeName.append(' ');
        }

        String nameComponent = nameComponents[j];
        String acronym = ACRYONYMS.get(nameComponent);
        if (acronym != null)
        {
          qualifiedPreferenceNodeName.append(acronym);
        }
        else
        {
          int length = nameComponent.length();
          if (length >= 1)
          {
            qualifiedPreferenceNodeName.append(Character.toUpperCase(nameComponent.charAt(0)));
            qualifiedPreferenceNodeName.append(nameComponent, 1, length);
          }
        }
      }
    }
    return rootNameComponents;
  }

  @Override
  protected void collectNewChildDescriptors(Collection<Object> newChildDescriptors, Object object)
  {
    Project project = (Project)object;
    Map<PreferenceNode, Set<Property>> unmanagedPreferenceNodes = ProjectConfigUtil.getUnmanagedPreferenceNodes(project);

    for (Map.Entry<PreferenceNode, Set<Property>> entry : unmanagedPreferenceNodes.entrySet())
    {
      PreferenceNode preferenceNode = entry.getKey();
      Set<Property> properties = entry.getValue();

      StringBuilder qualifiedPreferenceNodeName = new StringBuilder();
      String[] rootNameComponents = getRootComponents(preferenceNode, qualifiedPreferenceNodeName);

      PreferenceProfile preferenceProfile = ProjectConfigFactory.eINSTANCE.createPreferenceProfile();
      if (qualifiedPreferenceNodeName.length() > 0)
      {
        preferenceProfile.setName(qualifiedPreferenceNodeName.toString());
      }

      PreferenceFilter preferenceFilter = ProjectConfigFactory.eINSTANCE.createPreferenceFilter();
      preferenceFilter.setPreferenceNode(preferenceNode);
      preferenceProfile.getPreferenceFilters().add(preferenceFilter);

      EList<Property> realProperties = preferenceNode.getProperties();
      int realSize = realProperties.size();
      int targetSize = properties.size();
      if (realSize != targetSize)
      {
        if (realSize - targetSize > realSize / 2)
        {
          preferenceFilter.setInclusions(Pattern.compile(getPattern(properties)));
        }
        else
        {
          Set<Property> inverse = new HashSet<Property>(realProperties);
          inverse.removeAll(properties);
          preferenceFilter.setExclusions(Pattern.compile(getPattern(inverse)));
        }
      }

      AndPredicate andPredicate = createAndPredicate(project, rootNameComponents);
      preferenceProfile.getPredicates().add(andPredicate);

      newChildDescriptors.add(createChildParameter(ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILES, preferenceProfile));
    }

    Map<PreferenceNode, Map<Property, Property>> inconsistentPreferenceNodes = ProjectConfigUtil.getInconsistentPreferenceNodes(project);

    for (Map.Entry<PreferenceNode, Map<Property, Property>> entry : inconsistentPreferenceNodes.entrySet())
    {
      PreferenceNode preferenceNode = entry.getKey();

      StringBuilder qualifiedPreferenceNodeName = new StringBuilder();
      String[] rootNameComponents = getRootComponents(preferenceNode, qualifiedPreferenceNodeName);

      PreferenceProfile preferenceProfile = ProjectConfigFactory.eINSTANCE.createPreferenceProfile();
      if (qualifiedPreferenceNodeName.length() > 0)
      {
        preferenceProfile.setName(qualifiedPreferenceNodeName.toString());
      }

      PreferenceFilter preferenceFilter = ProjectConfigFactory.eINSTANCE.createPreferenceFilter();
      preferenceFilter.setPreferenceNode(preferenceNode);
      preferenceProfile.getPreferenceFilters().add(preferenceFilter);
      preferenceFilter.setInclusions(Pattern.compile(getPattern(entry.getValue().keySet())));

      AndPredicate andPredicate = createAndPredicate(project, rootNameComponents);

      NamePredicate namePredicate = PredicatesFactory.eINSTANCE.createNamePredicate();
      namePredicate.setPattern(project.getPreferenceNode().getName().replace(".", "\\."));
      andPredicate.getOperands().add(namePredicate);

      preferenceProfile.getPredicates().add(andPredicate);

      newChildDescriptors.add(createChildParameter(ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILES, preferenceProfile));
    }

    collectNewChildDescriptorsGen(newChildDescriptors, object);
  }

  private AndPredicate createAndPredicate(Project project, String[] rootNameComponents)
  {
    AndPredicate andPredicate = PredicatesFactory.eINSTANCE.createAndPredicate();

    RepositoryPredicate repositoryPredicate = PredicatesFactory.eINSTANCE.createRepositoryPredicate();
    IProject iProject = ProjectConfigUtil.getProject(project);
    repositoryPredicate.setProject(iProject);
    andPredicate.getOperands().add(repositoryPredicate);

    try
    {
      String[] natureIds = iProject.getDescription().getNatureIds();
      int bestMatchLength = 0;
      String bestNatureId = null;
      for (String natureId : natureIds)
      {
        String[] natureComponents = natureId.split("\\.");
        int index = 0;
        while (index < natureComponents.length && index < rootNameComponents.length)
        {
          if (!rootNameComponents[index].equals(natureComponents[index]))
          {
            break;
          }
          ++index;
        }

        if (bestMatchLength < index)
        {
          bestMatchLength = index;
          bestNatureId = natureId;
        }
      }

      if (bestMatchLength >= 3)
      {
        NaturePredicate naturePredicate = PredicatesFactory.eINSTANCE.createNaturePredicate();
        naturePredicate.setNature(bestNatureId);
        andPredicate.getOperands().add(naturePredicate);
      }
    }
    catch (CoreException ex)
    {
      // Ignore
    }
    return andPredicate;
  }

  private String getPattern(Collection<Property> properties)
  {
    StringBuilder pattern = new StringBuilder();
    for (Property property : properties)
    {
      String name = property.getName();
      name = name.replace(".", "\\.");
      if (pattern.length() != 0)
      {
        pattern.append('|');
      }
      pattern.append(name);
    }

    return pattern.toString();
  }

  private String getNamePattern(Collection<String> properties)
  {
    StringBuilder pattern = new StringBuilder();
    for (String name : properties)
    {
      name = name.replace(".", "\\.");
      if (pattern.length() != 0)
      {
        pattern.append('|');
      }
      pattern.append(name);
    }

    return pattern.toString();
  }

  /**
   * This adds {@link org.eclipse.emf.edit.command.CommandParameter}s describing the children
   * that can be created under this object.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected void collectNewChildDescriptorsGen(Collection<Object> newChildDescriptors, Object object)
  {
    super.collectNewChildDescriptors(newChildDescriptors, object);

    newChildDescriptors
        .add(createChildParameter(ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILES, ProjectConfigFactory.eINSTANCE.createPreferenceProfile()));
  }

  @Override
  public String getCreateChildText(Object owner, Object feature, Object child, Collection<?> selection)
  {
    String text = super.getCreateChildText(owner, feature, child, selection);
    if (child instanceof PreferenceProfile)
    {
      PreferenceProfile preferenceProfile = (PreferenceProfile)child;
      EList<PreferenceFilter> preferenceFilters = preferenceProfile.getPreferenceFilters();
      if (!preferenceFilters.isEmpty())
      {
        PreferenceFilter preferenceFilter = preferenceFilters.get(0);
        PreferenceNode preferenceNode = preferenceFilter.getPreferenceNode();
        if (preferenceNode != null)
        {
          text += " for " + PreferencesFactory.eINSTANCE.convertURI(preferenceNode.getRelativePath());
        }
      }
    }
    return text;
  }

  @Override
  protected Command createCreateChildCommand(EditingDomain domain, EObject owner, EStructuralFeature feature, Object value, int index, Collection<?> collection)
  {
    return new CreateChildCommand(domain, owner, feature, value, index, collection, this)
    {
      private CompoundCommand command;

      @Override
      public void execute()
      {
        super.execute();

        if (child instanceof PreferenceProfile)
        {
          PreferenceProfile preferenceProfile = (PreferenceProfile)child;
          Project project = preferenceProfile.getProject();
          WorkspaceConfiguration workspaceConfiguration = project.getConfiguration();
          for (PreferenceFilter preferenceFilter : preferenceProfile.getPreferenceFilters())
          {
            Map<PreferenceFilter, Set<Property>> incomingCollisions = new LinkedHashMap<PreferenceFilter, Set<Property>>();
            Map<PreferenceFilter, Set<Property>> outgoingCollisions = new LinkedHashMap<PreferenceFilter, Set<Property>>();
            URI preferenceFilterNodeRelativePath = preferenceFilter.getPreferenceNode().getRelativePath();
            for (Property property : preferenceFilter.getProperties())
            {
              URI relativePath = property.getRelativePath();
              for (PreferenceProfile preferenceProfileReference : project.getPreferenceProfileReferences())
              {
                Property managingProperty = preferenceProfileReference.getProperty(relativePath);
                if (managingProperty != null)
                {
                  for (PreferenceFilter preferenceFilterReference : preferenceProfileReference.getPreferenceFilters())
                  {
                    if (preferenceFilterReference.getPreferenceNode().getRelativePath().equals(preferenceFilterNodeRelativePath))
                    {
                      Set<Property> properties = incomingCollisions.get(preferenceFilterReference);
                      if (properties == null)
                      {
                        properties = new LinkedHashSet<Property>();
                        incomingCollisions.put(preferenceFilterReference, properties);
                      }
                      properties.add(property);
                    }
                  }
                }
              }

              Set<Project> collidingProjects = new HashSet<Project>();
              for (Project otherProject : workspaceConfiguration.getProjects())
              {
                if (otherProject != project)
                {
                  if (preferenceProfile.matches(WORKSPACE_ROOT.getProject(otherProject.getPreferenceNode().getName())))
                  {
                    Property managingProperty = otherProject.getProperty(relativePath);
                    if (managingProperty != null)
                    {
                      Project managingProject = workspaceConfiguration.getProject(managingProperty.getScope().getName());
                      if (managingProject != project)
                      {
                        collidingProjects.add(managingProject);
                      }
                    }
                  }
                }
              }

              for (Project collidingProject : collidingProjects)
              {
                for (PreferenceProfile collidingPreferenceProfile : collidingProject.getPreferenceProfiles())
                {
                  for (PreferenceFilter collidingPreferenceFilter : collidingPreferenceProfile.getPreferenceFilters())
                  {
                    if (collidingPreferenceFilter.getPreferenceNode().getRelativePath().equals(preferenceFilterNodeRelativePath))
                    {
                      Set<Property> properties = outgoingCollisions.get(collidingPreferenceFilter);
                      if (properties == null)
                      {
                        properties = new LinkedHashSet<Property>();
                        outgoingCollisions.put(collidingPreferenceFilter, properties);
                      }
                      properties.add(property);
                    }
                  }
                }
              }
            }

            for (Map.Entry<PreferenceFilter, Set<Property>> entry : incomingCollisions.entrySet())
            {
              if (command == null)
              {
                command = new CompoundCommand();
              }

              PreferenceFilter collidingPreferenceFilter = entry.getKey();
              PreferenceProfile collidingPreferenceProfile = collidingPreferenceFilter.getPreferenceProfile();
              Project collidingProject = collidingPreferenceProfile.getProject();
              Pattern pattern = Pattern.compile(getPattern(entry.getValue()));

              PreferenceProfile exceptionalPreferenceProfile = ProjectConfigFactory.eINSTANCE.createPreferenceProfile();
              exceptionalPreferenceProfile.setName(collidingPreferenceProfile.getName() + " Exceptional");

              PreferenceFilter exceptionalPreferenceFilter = ProjectConfigFactory.eINSTANCE.createPreferenceFilter();
              exceptionalPreferenceFilter.setInclusions(pattern);
              exceptionalPreferenceFilter.setPreferenceNode(collidingPreferenceFilter.getPreferenceNode());
              exceptionalPreferenceProfile.getPreferenceFilters().add(exceptionalPreferenceFilter);

              AndPredicate exceptionalAndPredicate = PredicatesFactory.eINSTANCE.createAndPredicate();

              InclusionPredicate exceptionalInclusionPredicate = ProjectConfigFactory.eINSTANCE.createInclusionPredicate();
              exceptionalInclusionPredicate.getIncludedPreferenceProfiles().add(collidingPreferenceProfile);
              exceptionalAndPredicate.getOperands().add(exceptionalInclusionPredicate);

              ExclusionPredicate exceptionalExclusionPredicate = ProjectConfigFactory.eINSTANCE.createExclusionPredicate();
              exceptionalExclusionPredicate.getExcludedPreferenceProfiles().add(preferenceProfile);
              exceptionalAndPredicate.getOperands().add(exceptionalExclusionPredicate);

              exceptionalPreferenceProfile.getPredicates().add(exceptionalAndPredicate);

              command.appendAndExecute(AddCommand.create(domain, collidingProject, ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILES,
                  Collections.singletonList(exceptionalPreferenceProfile)));

              Pattern exclusions = collidingPreferenceFilter.getExclusions();
              if (exclusions == null || exclusions.toString().length() == 0)
              {
                exclusions = pattern;
              }
              else
              {
                exclusions = Pattern.compile(exclusions.toString() + "|" + pattern.toString());
              }
              command.appendAndExecute(
                  SetCommand.create(domain, collidingPreferenceFilter, ProjectConfigPackage.Literals.PREFERENCE_FILTER__EXCLUSIONS, exclusions));
            }

            Set<String> union = new LinkedHashSet<String>();
            Set<PreferenceProfile> excludedPreferenceProfiles = new LinkedHashSet<PreferenceProfile>();
            Map<Set<String>, Set<PreferenceFilter>> exclusionCombinations = new LinkedHashMap<Set<String>, Set<PreferenceFilter>>();
            for (Map.Entry<PreferenceFilter, Set<Property>> entry : outgoingCollisions.entrySet())
            {
              Set<String> properties = new LinkedHashSet<String>();
              for (Property property : entry.getValue())
              {
                String name = property.getName();
                properties.add(name);
                union.add(name);
              }

              Set<PreferenceFilter> filters = exclusionCombinations.get(properties);
              if (filters == null)
              {
                filters = new LinkedHashSet<PreferenceFilter>();
                exclusionCombinations.put(properties, filters);
              }
              PreferenceFilter collidingPreferenceFilter = entry.getKey();
              filters.add(collidingPreferenceFilter);
              excludedPreferenceProfiles.add(collidingPreferenceFilter.getPreferenceProfile());
            }

            if (!union.isEmpty())
            {
              String unionPattern = getNamePattern(union);
              Pattern exclusions = preferenceFilter.getExclusions();
              if (exclusions == null || exclusions.toString().length() == 0)
              {
                exclusions = Pattern.compile(unionPattern);
              }
              else
              {
                exclusions = Pattern.compile(exclusions.toString() + "|" + unionPattern);
              }
              preferenceFilter.setExclusions(exclusions);

              if (command == null)
              {
                command = new CompoundCommand();
              }

              PreferenceProfile exceptionalPreferenceProfile = ProjectConfigFactory.eINSTANCE.createPreferenceProfile();
              exceptionalPreferenceProfile.setName(preferenceProfile.getName() + " Exceptional");

              PreferenceFilter exceptionalPreferenceFilter = ProjectConfigFactory.eINSTANCE.createPreferenceFilter();
              exceptionalPreferenceFilter.setInclusions(Pattern.compile(unionPattern));
              exceptionalPreferenceFilter.setPreferenceNode(preferenceFilter.getPreferenceNode());
              exceptionalPreferenceProfile.getPreferenceFilters().add(exceptionalPreferenceFilter);

              AndPredicate exceptionalAndPredicate = PredicatesFactory.eINSTANCE.createAndPredicate();

              ExclusionPredicate exceptionalExclusionPredicate = ProjectConfigFactory.eINSTANCE.createExclusionPredicate();
              exceptionalExclusionPredicate.getExcludedPreferenceProfiles().addAll(excludedPreferenceProfiles);
              exceptionalAndPredicate.getOperands().add(exceptionalExclusionPredicate);

              InclusionPredicate inclusionPredicate = ProjectConfigFactory.eINSTANCE.createInclusionPredicate();
              inclusionPredicate.getIncludedPreferenceProfiles().add(preferenceProfile);
              exceptionalAndPredicate.getOperands().add(inclusionPredicate);

              exceptionalPreferenceProfile.getPredicates().add(exceptionalAndPredicate);

              command.appendAndExecute(AddCommand.create(domain, project, ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILES,
                  Collections.singletonList(exceptionalPreferenceProfile)));

              int count = 0;
              for (Map.Entry<Set<String>, Set<PreferenceFilter>> entry : exclusionCombinations.entrySet())
              {
                Set<String> properties = new LinkedHashSet<String>(union);
                properties.removeAll(entry.getKey());
                if (!properties.isEmpty())
                {
                  PreferenceProfile partialPreferenceProfile = ProjectConfigFactory.eINSTANCE.createPreferenceProfile();
                  partialPreferenceProfile.setName(preferenceProfile.getName() + " Partial " + ++count);

                  PreferenceFilter partialPreferenceFilter = ProjectConfigFactory.eINSTANCE.createPreferenceFilter();
                  partialPreferenceFilter.setInclusions(Pattern.compile(getNamePattern(properties)));
                  partialPreferenceFilter.setPreferenceNode(preferenceFilter.getPreferenceNode());
                  partialPreferenceProfile.getPreferenceFilters().add(partialPreferenceFilter);

                  Set<String> projectNames = new LinkedHashSet<String>();
                  for (PreferenceFilter excludedPreferenceFilter : entry.getValue())
                  {
                    projectNames.add(excludedPreferenceFilter.getPreferenceProfile().getProject().getPreferenceNode().getName());
                  }

                  for (String projectName : projectNames)
                  {
                    NamePredicate namePredicate = PredicatesFactory.eINSTANCE.createNamePredicate();
                    namePredicate.setPattern(projectName.replace(".", "\\."));
                    partialPreferenceProfile.getPredicates().add(namePredicate);
                  }

                  command.appendAndExecute(AddCommand.create(domain, project, ProjectConfigPackage.Literals.PROJECT__PREFERENCE_PROFILES,
                      Collections.singletonList(partialPreferenceProfile)));
                }
              }
            }
          }
        }

        if (command != null)
        {
          HashSet<Object> combinedAffectedObjects = new HashSet<Object>(affectedObjects);
          combinedAffectedObjects.addAll(command.getAffectedObjects());
          affectedObjects = combinedAffectedObjects;
        }
      }

      @Override
      public void undo()
      {
        if (command != null)
        {
          command.undo();
        }

        super.undo();

        HashSet<Object> combinedAffectedObjects = new HashSet<Object>(affectedObjects);
        combinedAffectedObjects.addAll(command.getAffectedObjects());
        affectedObjects = combinedAffectedObjects;
      }

      @Override
      public void redo()
      {
        super.redo();

        if (command != null)
        {
          command.redo();
        }

        HashSet<Object> combinedAffectedObjects = new HashSet<Object>(affectedObjects);
        combinedAffectedObjects.addAll(command.getAffectedObjects());
        affectedObjects = combinedAffectedObjects;
      }
    };
  }

  /**
   * Return the resource locator for this item provider's resources.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public ResourceLocator getResourceLocator()
  {
    return ProjectConfigEditPlugin.INSTANCE;
  }

}