/*
 * 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.debugger.actions;

import com.intellij.debugger.engine.DebugProcessImpl;
import com.intellij.debugger.engine.JavaValue;
import com.intellij.debugger.engine.events.DebuggerContextCommandImpl;
import com.intellij.debugger.impl.DebuggerContextImpl;
import com.intellij.debugger.settings.NodeRendererSettings;
import com.intellij.debugger.ui.impl.watch.NodeDescriptorImpl;
import com.intellij.debugger.ui.impl.watch.ValueDescriptorImpl;
import com.intellij.debugger.ui.tree.render.NodeRenderer;
import com.intellij.openapi.actionSystem.*;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.DumbAware;
import com.intellij.xdebugger.frame.XValue;
import com.intellij.xdebugger.impl.ui.tree.actions.XDebuggerTreeActionBase;
import com.intellij.xdebugger.impl.ui.tree.nodes.XValueNodeImpl;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.List;

/**
 * User: lex
 * Date: Sep 26, 2003
 * Time: 11:05:57 PM
 */
public class ViewAsGroup extends ActionGroup implements DumbAware {
  private static final Logger LOG = Logger.getInstance("#com.intellij.debugger.actions.ViewAsGroup");

  private AnAction[] myChildren = AnAction.EMPTY_ARRAY;

  public ViewAsGroup() {
    super(null, true);
  }

  private static class RendererAction extends ToggleAction {
    private final NodeRenderer myNodeRenderer;

    public RendererAction(NodeRenderer nodeRenderer) {
      super(nodeRenderer.getName());
      myNodeRenderer = nodeRenderer;
    }

    public boolean isSelected(AnActionEvent e) {
      XValueNodeImpl node = XDebuggerTreeActionBase.getSelectedNode(e.getDataContext());
      if (node == null) {
        return false;
      }
      XValue container = node.getValueContainer();
      if (container instanceof JavaValue) {
        if (((JavaValue)container).getDescriptor().getLastRenderer() != myNodeRenderer) {
          return false;
        }
      }
      return true;
    }

    public void setSelected(final AnActionEvent e, final boolean state) {
      final DebuggerContextImpl debuggerContext = DebuggerAction.getDebuggerContext(e.getDataContext());
      final XValueNodeImpl node = XDebuggerTreeActionBase.getSelectedNode(e.getDataContext());

      LOG.assertTrue(debuggerContext != null && node != null);

      debuggerContext.getDebugProcess().getManagerThread().schedule(new DebuggerContextCommandImpl(debuggerContext) {
          public void threadAction() {
            XValue container = node.getValueContainer();
            if (container instanceof JavaValue) {
              final ValueDescriptorImpl valueDescriptor = ((JavaValue)container).getDescriptor();
              if (state) {
                valueDescriptor.setRenderer(myNodeRenderer);
                DebuggerAction.refreshViews(node);
                //valueDescriptor.updateRepresentation(debuggerContext.createEvaluationContext(), DescriptorLabelListener.DUMMY_LISTENER);
                //container.computePresentation(node, XValuePlace.TREE);
              }
            }
          }
        }
      );
    }
  }

  @NotNull
  public AnAction[] getChildren(@Nullable final AnActionEvent e) {
    return myChildren;
  }

  private static AnAction [] calcChildren(NodeDescriptorImpl[] descriptors) {
    List<AnAction> renderers = new ArrayList<AnAction>();

    List<NodeRenderer> allRenderers = NodeRendererSettings.getInstance().getAllRenderers();

    boolean anyValueDescriptor = false;

    for (NodeRenderer nodeRenderer : allRenderers) {
      boolean allApp = true;

      for (NodeDescriptorImpl descriptor : descriptors) {
        if (descriptor instanceof ValueDescriptorImpl) {
          anyValueDescriptor = true;
          ValueDescriptorImpl valueDescriptor = (ValueDescriptorImpl)descriptor;
          if (!valueDescriptor.isValueValid() || !nodeRenderer.isApplicable(valueDescriptor.getType())) {
            allApp = false;
            break;
          }
        }
      }

      if (!anyValueDescriptor) {
        return AnAction.EMPTY_ARRAY;
      }

      if (allApp) {
        renderers.add(new RendererAction(nodeRenderer));
      }
    }

    List<AnAction> children = new ArrayList<AnAction>();
    AnAction[] viewAsActions = ((DefaultActionGroup) ActionManager.getInstance().getAction(DebuggerActions.REPRESENTATION_LIST)).getChildren(null);
    for (AnAction viewAsAction : viewAsActions) {
      if (viewAsAction instanceof AutoRendererAction) {
        if (renderers.size() > 1) {
          viewAsAction.getTemplatePresentation().setVisible(true);
          children.add(viewAsAction);
        }
      }
      else {
        children.add(viewAsAction);
      }
    }

    if (!children.isEmpty()) {
      children.add(Separator.getInstance());
    }
    children.addAll(renderers);

    return children.toArray(new AnAction[children.size()]);
  }

  public void update(final AnActionEvent event) {
    if(!DebuggerAction.isFirstStart(event)) {
      return;
    }

    final DebuggerContextImpl debuggerContext = DebuggerAction.getDebuggerContext(event.getDataContext());
    XValueNodeImpl node = XDebuggerTreeActionBase.getSelectedNode(event.getDataContext());
    if (node == null) {
      return;
    }
    final XValue container = node.getValueContainer();
    if (!(container instanceof JavaValue)) {
      event.getPresentation().setEnabled(false);
      return;
    }

    final DebugProcessImpl process = debuggerContext.getDebugProcess();
    if (process == null) {
      event.getPresentation().setEnabled(false);
      return;
    }
    
    process.getManagerThread().schedule(new DebuggerContextCommandImpl(debuggerContext) {
      public void threadAction() {
        myChildren = calcChildren(new NodeDescriptorImpl[]{((JavaValue)container).getDescriptor()});
        DebuggerAction.enableAction(event, myChildren.length > 0);
      }
    });
  }
}