/*
 * 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.
 */
package com.intellij.uiDesigner.actions;

import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.Presentation;
import com.intellij.uiDesigner.*;
import com.intellij.uiDesigner.propertyInspector.UIDesignerToolWindowManager;
import com.intellij.uiDesigner.radComponents.RadComponent;
import com.intellij.uiDesigner.radComponents.RadContainer;
import com.intellij.uiDesigner.designSurface.GuiEditor;
import com.intellij.uiDesigner.componentTree.ComponentPtr;
import com.intellij.uiDesigner.componentTree.ComponentTreeBuilder;

import java.util.Stack;

/**
 * For each component selects all non selected siblings (if any). If
 * all component's siblings are already selected then selects component's
 * parent (if any).
 * 
 * @author Anton Katilin
 * @author Vladimir Kondratyev
 */
public final class ExpandSelectionAction extends AnAction{
  public void actionPerformed(final AnActionEvent e) {
    final GuiEditor editor = FormEditingUtil.getEditorFromContext(e.getDataContext());
    assert editor != null;
    final SelectionState selectionState = editor.getSelectionState();
    selectionState.setInsideChange(true);

    ComponentTreeBuilder builder = UIDesignerToolWindowManager.getInstance(editor.getProject()).getComponentTreeBuilder();
    builder.beginUpdateSelection();

    final Stack<ComponentPtr[]> history = selectionState.getSelectionHistory();

    try{
      final ComponentPtr[] ptrs = history.peek();
      for(int i = ptrs.length - 1; i >= 0; i--){
        // Skip invalid components
        final ComponentPtr ptr = ptrs[i];
        ptr.validate();
        if(!ptr.isValid()){
          continue;
        }

        // Extend selection
        final RadComponent component = ptr.getComponent();
        final RadContainer parent = component.getParent();
        if(parent == null){ // skip components without parents
          continue;
        }
        boolean shouldSelectParent = true;
        for(int j = parent.getComponentCount() - 1; j >= 0; j--){
          final RadComponent sibling = parent.getComponent(j);
          if(!sibling.isSelected()){
            shouldSelectParent = false;
            sibling.setSelected(true);
          }
        }
        if(shouldSelectParent){
          parent.setSelected(true);
        }
      }

      // Store new selection
      history.push(SelectionState.getSelection(editor));
    }finally{
      builder.endUpdateSelection();
      selectionState.setInsideChange(false);
    }
  }

  public void update(final AnActionEvent e) {
    final Presentation presentation = e.getPresentation();
    final GuiEditor editor = FormEditingUtil.getEditorFromContext(e.getDataContext());

    if(editor == null){
      presentation.setEnabled(false);
      return;
    }

    final SelectionState selectionState = editor.getSelectionState();
    selectionState.setInsideChange(true);
    final Stack<ComponentPtr[]> history = selectionState.getSelectionHistory();

    presentation.setEnabled(!history.isEmpty());
  }
}
