/**
    * This file Copyright (c) 2013 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.module.groovy.field;
  
  import groovy.lang.Binding;
  
  import info.magnolia.context.Context;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.module.groovy.console.MgnlGroovyConsole;
  import info.magnolia.module.groovy.console.MgnlGroovyConsoleContext;
  
  import java.io.ByteArrayInputStream;
  import java.io.StringWriter;
  import java.io.Writer;
  
  import com.vaadin.data.Item;
  import com.vaadin.data.Property;
  import com.vaadin.ui.Alignment;
  import com.vaadin.ui.Button;
  import com.vaadin.ui.Button.ClickEvent;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.CustomField;
  import com.vaadin.ui.NativeButton;
  import com.vaadin.ui.TextArea;
  import com.vaadin.ui.VerticalLayout;
  
  /**
   * ConsoleOutputField.
   */
  public class ConsoleOutputField extends CustomField<String> {
  
      private final VerticalLayout rootLayout = new VerticalLayout();
      private final TextArea outputArea = new TextArea();
      private final Button runButton = new NativeButton();
  
      private Item item;
      private SimpleTranslator simpleTranslator;
  
      public ConsoleOutputField(Item item, SimpleTranslator simpleTranslator) {
          this.item = item;
          this.simpleTranslator = simpleTranslator;
      }
  
      @Override
      protected Component initContent() {
          setImmediate(true);
          rootLayout.setSizeFull();
          rootLayout.setSpacing(true);
  
          runButton.addStyleName("magnoliabutton");
          runButton.setCaption(simpleTranslator.translate("groovy.script.consoleOutput.run"));
          runButton.addClickListener(createButtonClickListener());
  
          rootLayout.addComponent(runButton);
          rootLayout.setExpandRatio(runButton, 0);
          rootLayout.setComponentAlignment(runButton, Alignment.MIDDLE_LEFT);
  
          outputArea.setImmediate(true);
          outputArea.addStyleName("console-output");
          outputArea.setWidth(100, Unit.PERCENTAGE);
          outputArea.setNullRepresentation("");
          outputArea.setNullSettingAllowed(true);
  
          rootLayout.addComponent(outputArea);
  
          return rootLayout;
      }
 
     @Override
     public String getValue() {
         return outputArea.getValue();
     }
 
     @Override
     public Class<String> getType() {
         return String.class;
     }
 
     @SuppressWarnings("unchecked")
     private void runScript() {
 
         Context originalCtx = MgnlContext.getInstance();
         try {
             outputArea.setValue(simpleTranslator.translate("groovy.script.consoleOutput.run.wait"));
             runButton.setEnabled(false);
 
             MgnlGroovyConsoleContext groovyCtx = new MgnlGroovyConsoleContext(originalCtx);
             MgnlContext.setInstance(groovyCtx);
             MgnlGroovyConsole console = new MgnlGroovyConsole(new Binding());
             Property<String> scriptText = item.getItemProperty("text");
 
             Writer writer = new StringWriter();
 
             Object result = console.evaluate(new ByteArrayInputStream(scriptText.getValue().getBytes()), console.generateScriptName(), writer);
 
             StringBuilder sb = new StringBuilder().append(writer.toString()).append("\n").append(result);
 
             outputArea.setValue(sb.toString());
         } catch (Exception e) {
             outputArea.setValue(e.toString());
         } finally {
             MgnlContext.setInstance(originalCtx);
             runButton.setEnabled(true);
         }
     };
 
     private Button.ClickListener createButtonClickListener() {
         return new Button.ClickListener() {
             @Override
             public void buttonClick(ClickEvent event) {
                 runScript();
             }
         };
     }
 }