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/*

 * Copyright 2007, 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.MessagePanel.Images;

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

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

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

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

import java.util.ArrayList;

import java.util.List;

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

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

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

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

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

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

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

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

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

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

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

/**

 * The 'delete file' dialog box.

 */

public class DeleteFileDialog extends DialogBox {

        /**

         * The widget's constructor.

         *

         * @param images the supplied images

         */

        public DeleteFileDialog(Images images) {

                // Set the dialog's caption.

                setText("Confirmation");

                setAnimationEnabled(true);

                Object selection = GSS.get().getCurrentSelection();

                // Create a VerticalPanel to contain the label and the buttons.

                VerticalPanel outer = new VerticalPanel();

                HorizontalPanel buttons = new HorizontalPanel();

                HTML text;

                if (selection instanceof FileResource)

                        text = new HTML("<table><tr><td>" + images.warn().getHTML() + "</td><td>" + "Are you sure you want to <b>permanently</b> delete file '" + ((FileResource) selection).getName() + "'?</td></tr></table>");

                else

                        text = new HTML("<table><tr><td>" + images.warn().getHTML() + "</td><td>" + "Are you sure you want to <b>permanently</b> delete the selected files?</td></tr></table>");

                text.setStyleName("gss-warnMessage");

                outer.add(text);

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

                // when the button is clicked and deletes the file.

                Button ok = new Button("Delete", new ClickListener() {

                        public void onClick(Widget sender) {

                                deleteFile();

                                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 ClickListener() {

                        public void onClick(Widget sender) {

                                hide();

                        }

                });

                buttons.add(cancel);

                buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER);

                buttons.setSpacing(8);

                buttons.setStyleName("gss-warnMessage");

                outer.setStyleName("gss-warnMessage");

                outer.add(buttons);

                outer.setCellHorizontalAlignment(text, HasHorizontalAlignment.ALIGN_CENTER);

                outer.setCellHorizontalAlignment(buttons, HasHorizontalAlignment.ALIGN_CENTER);

                setWidget(outer);

        }

        /**

         * Generate an RPC request to delete a file.

         *

         * @param userId the ID of the current user

         */

        private void deleteFile() {

                Object selection = GSS.get().getCurrentSelection();

                if (selection == null) {

                        GSS.get().displayError("No file was selected");

                        return;

                }

                if (selection instanceof FileResource) {

                        FileResource file = (FileResource) selection;

                        DeleteCommand df = new DeleteCommand(file.getUri()){

                                @Override

                                public void onComplete() {

                                        GSS.get().getFileList().updateFileCache(true, true /*clear selection*/);

                                        GSS.get().getStatusPanel().updateStats();

                                }

                                @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("File not found");

                                                else

                                                        GSS.get().displayError("Unable to delete file: "+((RestException)t).getHttpStatusText());

                                        }

                                        else

                                                GSS.get().displayError("System error unable to delete file: "+t.getMessage());

                                }

                        };

                        DeferredCommand.addCommand(df);

                }

                else if(selection instanceof List){

                        List<FileResource> files = (List<FileResource>) selection;

                        List<String> fileIds = new ArrayList<String>();

                        for(FileResource f : files)

                                fileIds.add(f.getUri());

                        MultipleDeleteCommand ed = new MultipleDeleteCommand(fileIds.toArray(new String[0])){

                                @Override

                                public void onComplete() {

                                        GSS.get().showFileList(true);

                                }

                                @Override

                                public void onError(Throwable t) {

                                        GWT.log("", t);

                                        GSS.get().showFileList(true);

                                }

                                @Override

                                public void onError(String path, 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("File not found");

                                                else

                                                        GSS.get().displayError("Unable to delete file:"+((RestException)t).getHttpStatusText());

                                        }

                                        else

                                                GSS.get().displayError("System error unable to delete file:"+t.getMessage());

                                }

                        };

                        DeferredCommand.addCommand(ed);

                }

        }

        @Override

        public boolean onKeyDownPreview(final char key, final int modifiers) {

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

                // enter or escape is pressed.

                switch (key) {

                        case KeyboardListener.KEY_ENTER:

                                hide();

                                deleteFile();

                                break;

                        case KeyboardListener.KEY_ESCAPE:

                                hide();

                                break;

                }

                return true;

        }

}