/*
 * Copyright 2003-2016 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.
 */
package jetbrains.mps.ide.editor;

import com.intellij.openapi.fileEditor.FileEditor;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.project.Project;
import jetbrains.mps.nodeEditor.NodeEditorComponent;
import jetbrains.mps.openapi.editor.Editor;
import jetbrains.mps.openapi.editor.EditorComponent;
import org.jetbrains.mps.openapi.model.SNode;
import jetbrains.mps.nodefs.MPSNodeVirtualFile;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class MPSEditorUtil {
  @Nullable
  public static SNode getCurrentEditedNode(@NotNull Project project, @NotNull MPSNodeVirtualFile file) {
    FileEditor editor = FileEditorManager.getInstance(project).getSelectedEditor(file);
    if (!(editor instanceof MPSFileNodeEditor)) return null;

    Editor nodeEditor = ((MPSFileNodeEditor) editor).getNodeEditor();
    if (nodeEditor == null || !nodeEditor.isTabbed()) return null;

    EditorComponent tabEditor = nodeEditor.getCurrentEditorComponent();
    if (!(tabEditor instanceof NodeEditorComponent)) return null;

    return tabEditor.getEditedNode();
  }
}
