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/*
 * Copyright (c) 2004 - 2012 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.emf.cdo.workspace.internal.efs;

import org.eclipse.emf.cdo.workspace.CDOWorkspace;

import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.filesystem.provider.FileSystem;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.IPath;

import java.io.File;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;

/**
 * @author Eike Stepper
 */
public class CDOWorkspaceFileSystem extends FileSystem implements IResourceChangeListener
{
  public static final String SCHEME = "cdo.workspace";

  public static final String[] NO_CHILD_NAMES = {};

  private static CDOWorkspaceFileSystem instance;

  /**
   * Maps {@link IProject} name to {@link IFileStore}.
   */
  private Map<String, CDOWorkspaceStore> workspaceStores = new HashMap<String, CDOWorkspaceStore>();

  /**
   * <code>true</code> if this {@link CDOWorkspaceFileSystem} is registered as an {@link IResourceChangeListener} with
   * the {@link IWorkspace}, <code>false</code> otherwise.
   */
  private boolean workspaceListenerRegistered;

  /**
   * Called once by the {@link IExtensionRegistry}.
   */
  public CDOWorkspaceFileSystem()
  {
    instance = this;
  }

  public static CDOWorkspaceFileSystem getInstance()
  {
    return instance;
  }

  @Override
  public int attributes()
  {
    return EFS.ATTRIBUTE_OTHER_READ | EFS.ATTRIBUTE_OTHER_WRITE;
  }

  @Override
  public boolean isCaseSensitive()
  {
    return true;
  }

  @Override
  public IFileStore getStore(URI uri)
  {
    String path = uri.getSchemeSpecificPart();
    StringTokenizer tokenizer = new StringTokenizer(path, "/");
    String name = tokenizer.nextToken();

    IFileStore store = getWorkspaceStore(name);

    while (tokenizer.hasMoreTokens())
    {
      name = tokenizer.nextToken();
      store = store.getChild(name);
    }

    return store;
  }

  public void resourceChanged(IResourceChangeEvent event)
  {
    IResourceDelta delta = event.getDelta();
    if (delta != null)
    {
      IResourceDelta[] deltas = delta.getAffectedChildren();
      projectsChanged(deltas);
    }
  }

  private void projectsChanged(IResourceDelta[] deltas)
  {
    for (IResourceDelta delta : deltas)
    {
      int kind = delta.getKind();
      boolean removed = kind == IResourceDelta.REMOVED;
      if (!removed)
      {
        int flags = delta.getFlags();
        if ((flags & IResourceDelta.OPEN) != 0)
        {
          IProject project = (IProject)delta.getResource();
          removed = !project.isOpen();
        }
      }

      if (removed)
      {
        String name = delta.getFullPath().segment(0);

        CDOWorkspaceStore store;
        synchronized (workspaceStores)
        {
          store = workspaceStores.remove(name);

          if (workspaceStores.isEmpty())
          {
            ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
            workspaceListenerRegistered = false;
          }
        }

        if (store != null)
        {
          store.dispose();
        }
      }
    }
  }

  public CDOWorkspaceStore addWorkspaceStore(String name, CDOWorkspace workspace)
  {
    synchronized (workspaceStores)
    {
      CDOWorkspaceStore store = createWorkspaceStore(name);
      store.setWorkspace(workspace);
      addWorkspaceStore(store);
      return store;
    }
  }

  private void addWorkspaceStore(IFileStore store)
  {
    workspaceStores.put(store.getName(), (CDOWorkspaceStore)store);

    if (!workspaceListenerRegistered)
    {
      ResourcesPlugin.getWorkspace().addResourceChangeListener(this);
      workspaceListenerRegistered = true;
    }
  }

  private IFileStore getWorkspaceStore(String name)
  {
    synchronized (workspaceStores)
    {
      IFileStore store = workspaceStores.get(name);
      if (store == null)
      {
        store = createWorkspaceStore(name);
        addWorkspaceStore(store);
      }

      return store;
    }
  }

  private CDOWorkspaceStore createWorkspaceStore(String name)
  {
    IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
    IPath location = root.getLocation().append(name);
    return new CDOWorkspaceStore(name, new File(location.toOSString()));
  }
}