/**
    * This file Copyright (c) 2012-2013 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.messages.app;
  
  import info.magnolia.ui.api.message.MessageType;
  
  import java.io.Serializable;
  
  import com.vaadin.data.Property.ValueChangeEvent;
  import com.vaadin.data.Property.ValueChangeListener;
  import com.vaadin.data.fieldgroup.FieldGroup;
  import com.vaadin.data.fieldgroup.FieldGroup.CommitException;
  import com.vaadin.data.util.BeanItem;
  import com.vaadin.shared.ui.label.ContentMode;
  import com.vaadin.ui.Button;
  import com.vaadin.ui.Button.ClickEvent;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.CssLayout;
  import com.vaadin.ui.Field;
  import com.vaadin.ui.FormLayout;
  import com.vaadin.ui.HorizontalLayout;
  import com.vaadin.ui.Label;
  import com.vaadin.ui.NativeButton;
  import com.vaadin.ui.OptionGroup;
  import com.vaadin.ui.TextArea;
  import com.vaadin.ui.TextField;
  
  /**
   * View implementation for the Messages app.
   */
  public class MessagesViewImpl implements MessagesView {
  
      private static final String MESSAGE_SCOPE_GLOBAL = "Global";
      private static final String MESSAGE_SCOPE_LOCAL = "Local";
      private static final String MESSAGE_SCOPE_USER = "User";
      private static final String MESSAGE_SCOPE_GROUP = "Group";
  
      private Listener listener;
  
      private final Component component;
      private Field<String> userOrGroupIdField;
  
      public MessagesViewImpl() {
  
          // create form and data item
          final Message message = new Message(); // message POJO
          BeanItem<Message> messageItem = new BeanItem<Message>(message);
  
          final FieldGroup form = new FieldGroup();
          form.setItemDataSource(messageItem);
  
          Field<String> subjectField = createSubjectTextField();
          Field<String> messageBodyField = createMessageBodyTextField();
          Field<?> typeField = createTypeSelectionField();
          Field<?> scopeField = createScopeSelectionField();
          userOrGroupIdField = createUserOrGroupIdTextField();
  
          // disable user/group field if not necessary
          scopeField.addValueChangeListener(new ValueChangeListener() {
  
              @Override
              public void valueChange(ValueChangeEvent event) {
                  updateUserOrGroupField((String) event.getProperty().getValue());
              }
          });
  
          form.bind(subjectField, "title");
          form.bind(messageBodyField, "content");
         form.bind(typeField, "type");
         form.bind(scopeField, "scope");
         form.bind(userOrGroupIdField, "user");
         // FieldGroup overrides fields' own enabled property with its own.
         updateUserOrGroupField(message.getScope());
 
         FormLayout layout = new FormLayout();
         layout.addComponent(subjectField);
         layout.addComponent(messageBodyField);
         layout.addComponent(typeField);
         layout.addComponent(scopeField);
         layout.addComponent(userOrGroupIdField);
 
         layout.setSpacing(true);
         layout.setMargin(false);
         layout.setWidth("100%");
 
         // send button
         NativeButton sendButton = new NativeButton("Send message", new Button.ClickListener() {
 
             @Override
             public void buttonClick(Button.ClickEvent event) {
                 try {
                     form.commit();
                     String subject = message.getTitle();
                     String content = message.getContent();
                     MessageType type = message.getType();
                     String scope = message.getScope();
 
                     if (MESSAGE_SCOPE_LOCAL.equals(scope)) {
                         listener.handleLocalMessage(type, subject, content);
                     } else if (MESSAGE_SCOPE_GLOBAL.equals(scope)) {
                         listener.handleGlobalMessage(type, subject, content);
                     } else if (MESSAGE_SCOPE_GROUP.equals(scope)) {
                         // message is bound to FieldGroup - hence the group name is to be retrieved from the user field of the message
                         final String groupName = message.getUser();
                         listener.handleGroupMessage(groupName, type, subject, content);
                     } else {
                         // User...
                         final String userName = message.getUser();
                         listener.handleUserMessage(userName, type, subject, content);
                     }
                 } catch (CommitException e) {
 
                 }
             }
         });
         sendButton.addStyleName("btn-dialog");
         sendButton.addStyleName("btn-dialog-commit");
 
         // reset button
         NativeButton resetButton = new NativeButton("Reset", new Button.ClickListener() {
 
             @Override
             public void buttonClick(ClickEvent event) {
                 message.reset();
                 form.discard();
             }
         });
         resetButton.addStyleName("btn-dialog");
         resetButton.addStyleName("btn-dialog-cancel");
 
         HorizontalLayout buttons = new HorizontalLayout();
         buttons.addStyleName("buttons");
         buttons.setSpacing(true);
         buttons.addComponent(sendButton);
         buttons.addComponent(resetButton);
         layout.addComponent(buttons);
 
         // intro text
         Label intro = new Label("This app enables to send different types of messages to some or all users on a Magnolia instance.<br />" +
                 "Please note that this app is for testing purposes only and will be removed in the final release.", ContentMode.HTML);
         intro.addStyleName("intro");
 
         CssLayout container = new CssLayout();
         container.setSizeFull();
         container.addStyleName("small-app-panel");
         container.addComponent(layout);
 
         CssLayout root = new CssLayout();
         root.setSizeFull();
         root.setWidth("900px");
         root.setStyleName("small-app");
         root.addComponent(intro);
         root.addComponent(container);
 
         component = root;
     }
 
     private Field<String> createUserOrGroupIdTextField() {
         final TextField userOrGroupField = new TextField("User or group");
         userOrGroupField.setWidth("360px");
         return userOrGroupField;
     }
 
     private void updateUserOrGroupField(String scope) {
         if (MESSAGE_SCOPE_GLOBAL.equals(scope)
                 || MESSAGE_SCOPE_LOCAL.equals(scope)) {
             userOrGroupIdField.setEnabled(false);
         } else {
             userOrGroupIdField.setEnabled(true);
         }
     }
 
     @Override
     public void setListener(Listener listener) {
         this.listener = listener;
     }
 
     @Override
     public Component asVaadinComponent() {
         return component;
     }
 
     private Field<String> createMessageBodyTextField() {
         final TextArea messageField = new TextArea("Message");
         messageField.setSizeFull();
         return messageField;
     }
 
     private OptionGroup createTypeSelectionField() {
         final OptionGroup types = new OptionGroup("Type of message");
         types.setNullSelectionAllowed(false);
         types.addItem(MessageType.INFO);
         types.setItemCaption(MessageType.INFO, "Informational");
         types.addItem(MessageType.WARNING);
         types.setItemCaption(MessageType.WARNING, "Warning");
         types.addItem(MessageType.ERROR);
         types.setItemCaption(MessageType.ERROR, "Error");
         types.setValue(MessageType.INFO);
         types.addStyleName("horizontal");
         return types;
     }
 
     private OptionGroup createScopeSelectionField() {
         final OptionGroup scopes = new OptionGroup("Scope");
         scopes.setImmediate(true);
         scopes.setNullSelectionAllowed(false);
         scopes.addItem(MESSAGE_SCOPE_GLOBAL);
         scopes.setItemCaption(MESSAGE_SCOPE_GLOBAL, "Send to all users");
         scopes.addItem(MESSAGE_SCOPE_LOCAL);
         scopes.setItemCaption(MESSAGE_SCOPE_LOCAL, "Send to yourself only");
         scopes.addItem(MESSAGE_SCOPE_USER);
         scopes.setItemCaption(MESSAGE_SCOPE_USER, "Send to user");
         scopes.addItem(MESSAGE_SCOPE_GROUP);
         scopes.setItemCaption(MESSAGE_SCOPE_GROUP, "Send to group");
         // initial selection
         scopes.addStyleName("vertical");
         return scopes;
     }
 
     private Field<String> createSubjectTextField() {
         final TextField subjectField = new TextField("Message title");
         subjectField.addStyleName("required");
         subjectField.setSizeFull();
         subjectField.setRequired(true);
         // force plain input
         subjectField.setColumns(0);
         return subjectField;
     }
 
     /**
      * The Message POJO.
      */
     public class Message implements Serializable {
 
         private String title;
 
         private String content;
 
         private MessageType type;
 
         private String scope;
 
         private String user;
 
         public Message() {
             reset();
         }
 
         public void reset() {
             title = "";
             content = "";
             type = MessageType.INFO;
             scope = MESSAGE_SCOPE_LOCAL;
             user = "";
         }
 
         public String getTitle() {
             return title;
         }
 
         public void setTitle(String title) {
             this.title = title;
         }
 
         public String getContent() {
             return content;
         }
 
         public void setContent(String content) {
             this.content = content;
         }
 
         public MessageType getType() {
             return type;
         }
 
         public void setType(MessageType type) {
             this.type = type;
         }
 
         public String getScope() {
             return scope;
         }
 
         public void setScope(String scope) {
             this.scope = scope;
         }
 
         public String getUser() {
             return user;
         }
 
         public void setUser(String user) {
             this.user = user;
         }
 
     }
 }