Synnefo

/*

 * Copyright 2008, 2009 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * GSS is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.client;

import gr.ebs.gss.client.rest.GetCommand;

import gr.ebs.gss.client.rest.PostCommand;

import gr.ebs.gss.client.rest.RestException;

import gr.ebs.gss.client.rest.resource.GroupResource;

import gr.ebs.gss.client.rest.resource.UserResource;

import gr.ebs.gss.client.rest.resource.UserSearchResource;

import com.google.gwt.core.client.GWT;

import com.google.gwt.dom.client.NativeEvent;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.event.dom.client.FocusEvent;

import com.google.gwt.event.dom.client.FocusHandler;

import com.google.gwt.event.dom.client.KeyCodes;

import com.google.gwt.event.dom.client.KeyUpEvent;

import com.google.gwt.event.dom.client.KeyUpHandler;

import com.google.gwt.http.client.URL;

import com.google.gwt.user.client.DeferredCommand;

import com.google.gwt.user.client.Event.NativePreviewEvent;

import com.google.gwt.user.client.ui.Button;

import com.google.gwt.user.client.ui.DialogBox;

import com.google.gwt.user.client.ui.FlexTable;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;

import com.google.gwt.user.client.ui.HorizontalPanel;

import com.google.gwt.user.client.ui.Label;

import com.google.gwt.user.client.ui.MultiWordSuggestOracle;

import com.google.gwt.user.client.ui.SuggestBox;

import com.google.gwt.user.client.ui.VerticalPanel;

/**

 * @author kman

 */

public class UserAddDialog extends DialogBox {

        private MultiWordSuggestOracle oracle = new MultiWordSuggestOracle();

        private SuggestBox suggestBox = new SuggestBox(oracle);

        String selectedUser=null;

        FlexTable userTable = new FlexTable();

        /**

         * The widget's constructor.

         */

        public UserAddDialog() {

                setAnimationEnabled(true);

                setText("Add User");

                VerticalPanel panel = new VerticalPanel();

                setWidget(panel);

                panel.addStyleName("gwt-TabPanelBottom");

                userTable.addStyleName("gss-permList");

                userTable.setWidget(0, 0, new Label("Username:"));

                userTable.getFlexCellFormatter().setStyleName(0, 0, "props-toplabels");

                suggestBox.getTextBox().addFocusHandler(new FocusHandler() {

                        @Override

                        public void onFocus(FocusEvent event) {

                                if (selectedUser != null && selectedUser.endsWith("@"))

                                        updateSuggestions();

                        }

                });

                suggestBox.addKeyUpHandler(new KeyUpHandler() {

                        @Override

                        public void onKeyUp(KeyUpEvent event) {

                                // Ignore the arrow keys.

                                int keyCode=event.getNativeKeyCode();

                                if(keyCode == KeyCodes.KEY_UP ||

                                                keyCode == KeyCodes.KEY_DOWN ||

                                                keyCode == KeyCodes.KEY_LEFT ||

                                                keyCode == KeyCodes.KEY_RIGHT)

                                        return;

                                String text = suggestBox.getText().trim();

                                // Avoid useless queries for keystrokes that do not modify the

                                // text.

                                if (text.equals(selectedUser))

                                        return;

                                selectedUser = text;

                                // Go to the server only if the user typed the @ character.

                                if (selectedUser.endsWith("@"))

                                        updateSuggestions();

                        }

                });

        userTable.setWidget(0, 1, suggestBox);

        panel.add(userTable);

                HorizontalPanel buttons = new HorizontalPanel();

                Button ok = new Button("OK", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                addUser();

                                hide();

                        }

                });

                buttons.add(ok);

                buttons.setCellHorizontalAlignment(ok, HasHorizontalAlignment.ALIGN_CENTER);

                // Create the 'Cancel' button, along with a listener that hides the

                // dialog when the button is clicked.

                Button cancel = new Button("Cancel", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                hide();

                        }

                });

                buttons.add(cancel);

                buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER);

                buttons.setSpacing(8);

                buttons.addStyleName("gwt-TabPanelBottom");

                panel.add(buttons);

                panel.setCellHorizontalAlignment(buttons, HasHorizontalAlignment.ALIGN_CENTER);

                panel.addStyleName("gss-DialogBox");

        }

        @Override

        public void center() {

                super.center();

                suggestBox.setFocus(true);

        }

        @Override

        protected void onPreviewNativeEvent(NativePreviewEvent preview) {

                super.onPreviewNativeEvent(preview);

                NativeEvent evt = preview.getNativeEvent();

                if (evt.getType().equals("keydown"))

                        // Use the popup's key preview hooks to close the dialog when either

                        // enter or escape is pressed.

                        switch (evt.getKeyCode()) {

                                case KeyCodes.KEY_ENTER:

                                        addUser();

                                        hide();

                                        break;

                                case KeyCodes.KEY_ESCAPE:

                                        hide();

                                        break;

                        }

        }

        /**

         * Generate a request to add a user to a group.

         *

         * @param groupName the name of the group to create

         */

        private void addUser() {

                GroupResource group = (GroupResource) GSS.get().getCurrentSelection();

                selectedUser = suggestBox.getText();

                if ( group == null ) {

                        GSS.get().displayError("Empty group name!");

                        return;

                }

                if ( selectedUser == null ) {

                        GSS.get().displayError("No User Selected!");

                        return;

                }

                PostCommand cg = new PostCommand(group.getUri()+"?name="+selectedUser, "", 201){

                        @Override

                        public void onComplete() {

                                GSS.get().getGroups().updateGroups();

                                GSS.get().showUserList();

                        }

                        @Override

                        public void onError(Throwable t) {

                                GWT.log("", t);

                                if(t instanceof RestException){

                                        int statusCode = ((RestException)t).getHttpStatusCode();

                                        if(statusCode == 405)

                                                GSS.get().displayError("You don't have the necessary permissions");

                                        else if(statusCode == 404)

                                                GSS.get().displayError("User does not exist");

                                        else if(statusCode == 409)

                                                GSS.get().displayError("A user with the same name already exists");

                                        else if(statusCode == 413)

                                                GSS.get().displayError("Your quota has been exceeded");

                                        else

                                                GSS.get().displayError("Unable to add user: "+((RestException)t).getHttpStatusText());

                                }

                                else

                                        GSS.get().displayError("System error adding user: "+t.getMessage());

                        }

                };

                DeferredCommand.addCommand(cg);

        }

        /**

         * Update the list of suggestions.

         */

        protected void updateSuggestions() {

                final GSS app = GSS.get();

                String query = selectedUser.substring(0, selectedUser.length()-1);

                GWT.log("Searching for " + query, null);

                GetCommand<UserSearchResource> eg = new GetCommand<UserSearchResource>(UserSearchResource.class,

                                        app.getApiPath() + "users/" + URL.encodeComponent(query), false) {

                        @Override

                        public void onComplete() {

                                DisplayHelper.hideSuggestions(suggestBox);

                                oracle.clear();

                                UserSearchResource s = getResult();

                                for (UserResource user : s.getUsers()) {

                                        GWT.log("Found " + user.getUsername(), null);

                                        oracle.add(user.getUsername());

                                }

                                DisplayHelper.showSuggestions(suggestBox, selectedUser);

                        }

                        @Override

                        public void onError(Throwable t) {

                                if(t instanceof RestException)

                                        app.displayError("Unable to perform search: "+((RestException)t).getHttpStatusText());

                                else

                                        app.displayError("System error while searching for users: "+t.getMessage());

                                GWT.log("", t);

                                DisplayHelper.log(t.getMessage());

                        }

                };

                DeferredCommand.addCommand(eg);

        }

}