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/*
 * Copyright 2000-2014 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.codeInsight.documentation;

import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.popup.JBPopup;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.wm.ToolWindow;
import com.intellij.openapi.wm.ToolWindowId;
import com.intellij.openapi.wm.ToolWindowManager;
import com.intellij.psi.PsiElement;
import com.intellij.ui.content.Content;
import com.intellij.ui.popup.AbstractPopup;
import com.intellij.util.Producer;
import org.jetbrains.annotations.NotNull;

import javax.swing.*;

/**
 * @author gregsh
 */
public class QuickDocUtil {

  public static void updateQuickDocAsync(@NotNull final PsiElement element, @NotNull final Producer<String> docProducer) {
    final Project project = element.getProject();
    ApplicationManager.getApplication().executeOnPooledThread(new Runnable() {
      @Override
      public void run() {
        final String documentation = docProducer.produce();
        if (StringUtil.isEmpty(documentation)) return;
        // modal dialogs with fragment editors fix: can't guess proper modality state here
        //noinspection SSBasedInspection
        SwingUtilities.invokeLater(new Runnable() {
          @Override
          public void run() {
            DocumentationManager documentationManager = DocumentationManager.getInstance(project);
            DocumentationComponent component;
            JBPopup hint = documentationManager.getDocInfoHint();
            if (hint != null) {
              component = (DocumentationComponent)((AbstractPopup)hint).getComponent();
            }
            else if (documentationManager.hasActiveDockedDocWindow()) {
              ToolWindow toolWindow = ToolWindowManager.getInstance(project).getToolWindow(ToolWindowId.DOCUMENTATION);
              Content selectedContent = toolWindow == null ? null : toolWindow.getContentManager().getSelectedContent();
              component = selectedContent == null ? null : (DocumentationComponent)selectedContent.getComponent();
            }
            else {
              component = null;
            }
            if (component != null) {
              component.replaceText(documentation, element);
            }
          }
        });
      }
    });
  }
}