/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @author Vladimir Kondratyev
 */
package com.intellij.ide.actions;

import com.intellij.CommonBundle;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.Messages;
import com.intellij.openapi.vfs.VfsUtilCore;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.io.ReadOnlyAttributeUtil;

import java.io.IOException;
import java.util.ArrayList;

public class ToggleReadOnlyAttributeAction extends AnAction implements DumbAware {
  static VirtualFile[] getFiles(DataContext dataContext) {
    ArrayList<VirtualFile> filesList = ContainerUtil.newArrayList();
    VirtualFile[] files = CommonDataKeys.VIRTUAL_FILE_ARRAY.getData(dataContext);
    for (int i = 0; files != null && i < files.length; i++) {
      VirtualFile file = files[i];
      if (file.isInLocalFileSystem()) {
        filesList.add(file);
      }
    }
    return VfsUtilCore.toVirtualFileArray(filesList);
  }

  public void update(AnActionEvent e) {
    VirtualFile[] files = getFiles(e.getDataContext());
    e.getPresentation().setEnabledAndVisible(files.length > 0);
    if (files.length > 0) {
      boolean allReadOnly = true;
      boolean allWritable = true;
      for (VirtualFile file : files) {
        if (file.isWritable()) {
          allReadOnly = false;
        }
        else {
          allWritable = false;
        }
      }
      if (allReadOnly) {
        e.getPresentation().setText(files.length > 1 ? "Make Files Writable" : "Make File Writable");
      }
      else if (allWritable) {
        e.getPresentation().setText(files.length > 1 ? "Make Files Read-only" : "Make File Read-only");
      }
      else {
        e.getPresentation().setText("Toggle Read-only Attribute");
      }
    }
  }

  public void actionPerformed(final AnActionEvent e) {
    ApplicationManager.getApplication().runWriteAction(
      new Runnable() {
        public void run() {
          // Save all documents. We won't be able to save changes to the files that became read-only afterwards.
          FileDocumentManager.getInstance().saveAllDocuments();

          try {
            VirtualFile[] files = getFiles(e.getDataContext());
            for (VirtualFile file : files) {
              ReadOnlyAttributeUtil.setReadOnlyAttribute(file, file.isWritable());
            }
          }
          catch (IOException exc) {
            Project project = CommonDataKeys.PROJECT.getData(e.getDataContext());
            Messages.showMessageDialog(
              project,
              exc.getMessage(),
              CommonBundle.getErrorTitle(), Messages.getErrorIcon()
            );
          }
        }
      }
    );
  }
}