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/*

 * 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.FilePropertiesDialog.Images;

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

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

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

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

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

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

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

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

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.Date;

import java.util.List;

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

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

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

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

import com.google.gwt.i18n.client.DateTimeFormat;

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

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

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

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

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

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

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

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

/**

 * @author kman

 */

public class VersionsList extends Composite {

        int selectedRow = -1;

        int permissionCount = -1;

        List<FileResource> versions = null;

        final Images images;

        final VerticalPanel permPanel = new VerticalPanel();

        final FlexTable permTable = new FlexTable();

        FileResource toRemove = null;

        FilePropertiesDialog container;

        public VersionsList(FilePropertiesDialog aContainer, final Images theImages, List<FileResource> theVersions) {

                images = theImages;

                container = aContainer;

                versions = theVersions;

                Collections.sort(theVersions, new Comparator<FileResource>(){

                        @Override

                        public int compare(FileResource o1, FileResource o2) {

                                return o1.getVersion().compareTo(o2.getVersion());

                        }

                });

                permTable.setText(0, 0, "Version");

                permTable.setText(0, 1, "Created");

                permTable.setText(0, 2, "Modified");

                permTable.setText(0, 3, "Size");

                permTable.setText(0, 4, "");

                permTable.setText(0, 5, "");

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

                permTable.getFlexCellFormatter().setStyleName(0, 1, "props-toplabels");

                permTable.getFlexCellFormatter().setStyleName(0, 2, "props-toplabels");

                permTable.getFlexCellFormatter().setStyleName(0, 3, "props-toplabels");

                permTable.getFlexCellFormatter().setColSpan(0, 1, 2);

                permTable.getFlexCellFormatter().setHorizontalAlignment(0, 0, HasHorizontalAlignment.ALIGN_CENTER);

                permTable.getFlexCellFormatter().setHorizontalAlignment(0, 1, HasHorizontalAlignment.ALIGN_CENTER);

                permTable.getFlexCellFormatter().setHorizontalAlignment(0, 2, HasHorizontalAlignment.ALIGN_CENTER);

                permTable.getFlexCellFormatter().setHorizontalAlignment(0, 3, HasHorizontalAlignment.ALIGN_CENTER);

                permPanel.add(permTable);

                permPanel.addStyleName("gss-TabPanelBottom");

                permTable.addStyleName("gss-permList");

                initWidget(permPanel);

                updateTable();

        }

        public void updateTable() {

                copyListAndContinue(versions);                

        }

        public void showVersionsTable(){

                int i = 1;

                if (toRemove != null) {

                        versions.remove(toRemove);

                        toRemove = null;

                }

                for (final FileResource dto : versions) {

                        HTML restoreVersion = new HTML("<a href='#' class='hidden-link info'><span>"+AbstractImagePrototype.create(images.restore()).getHTML()+"</span><div>Restore this Version</div></a>");

                        restoreVersion.addClickHandler(new ClickHandler() {

                                @Override

                                public void onClick(ClickEvent event) {

                                        restoreVersion(dto);

                                }

                        });

                        permTable.setHTML(i, 0, "<span>" + dto.getVersion() + "</span>");

                        permTable.setHTML(i, 1, "<span>" + formatDate(dto.getCreationDate()) + " by " + GSS.get().findUserFullName(dto.getCreatedBy()) + "</span>");

                        permTable.setHTML(i, 2, "<span>" + formatDate(dto.getModificationDate()) + " by " + GSS.get().findUserFullName(dto.getModifiedBy()) + "</span>");

                        permTable.setHTML(i, 3, "<span>" + dto.getFileSizeAsString() + "</span>");

                        HTML downloadHtml = new HTML("<a class='hidden-link info' href='#'><span>"+AbstractImagePrototype.create(images.download()).getHTML()+"</span><div>View this Version</div></a>");

                        downloadHtml.addClickHandler(new ClickHandler() {

                                @Override

                                public void onClick(ClickEvent event) {

                                        GSS app = GSS.get();

                                        String dateString = RestCommand.getDate();

                                        String resource = dto.getUri().substring(app.getApiPath().length()-1, dto.getUri().length());

                                        String sig = app.getCurrentUserResource().getUsername()+" "+RestCommand.calculateSig("GET", dateString, resource, RestCommand.base64decode(app.getToken()));

                                        String fileUrl = dto.getUri() + "?version=" + dto.getVersion() + "&Authorization=" + URL.encodeComponent(sig) + "&Date="+URL.encodeComponent(dateString);

                                        Window.open(fileUrl, "_BLANK", "");

                                }

                        });

                        permTable.setWidget(i, 4, downloadHtml);

                        permTable.setWidget(i, 5, restoreVersion);

                        permTable.getFlexCellFormatter().setStyleName(i, 0, "props-labels");

                        permTable.getFlexCellFormatter().setHorizontalAlignment(i, 0, HasHorizontalAlignment.ALIGN_CENTER);

                        permTable.getFlexCellFormatter().setHorizontalAlignment(i, 1, HasHorizontalAlignment.ALIGN_CENTER);

                        permTable.getFlexCellFormatter().setColSpan(i, 1, 2);

                        permTable.getFlexCellFormatter().setHorizontalAlignment(i, 2, HasHorizontalAlignment.ALIGN_CENTER);

                        permTable.getFlexCellFormatter().setHorizontalAlignment(i, 3, HasHorizontalAlignment.ALIGN_CENTER);

                        i++;

                }

                for (; i < permTable.getRowCount(); i++)

                        permTable.removeRow(i);

        }

        void removeVersion(final FileResource version) {

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

                        @Override

                        public void onComplete() {

                                toRemove = version;

                                updateTable();

                                GSS.get().getTreeView().refreshCurrentNode();

                        }

                        @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("Versions does not exist");

                                        else

                                                GSS.get().displayError("Unable to remove version:"+((RestException)t).getHttpStatusText());

                                }

                                else

                                        GSS.get().displayError("System error removing version:"+t.getMessage());

                        }

                };

                DeferredCommand.addCommand(df);

        }

        void restoreVersion(final FileResource version) {

                FileResource selectedFile = (FileResource) GSS.get().getCurrentSelection();

                PostCommand ep = new PostCommand(selectedFile.getUri()+"?restoreVersion="+version.getVersion(),"",200){

                        @Override

                        public void onComplete() {

                                container.hide();

                GSS.get().getTreeView().refreshCurrentNode();

                        }

                        @Override

                        public void onError(Throwable t) {

                                GWT.log("", t);

                                if(t instanceof RestException)

                                        GSS.get().displayError("Unable to restore version:"+((RestException)t).getHttpStatusText());

                                else

                                        GSS.get().displayError("System error restoring version:"+t.getMessage());

                        }

                };

                DeferredCommand.addCommand(ep);

        }

        private String formatDate(Date date){

                DateTimeFormat format = DateTimeFormat.getFormat("dd/MM/yyyy : HH:mm");

                return format.format(date);

        }

        /**

         * Copies the input List to a new List

         * @param input

         */

        private void copyListAndContinue(List<FileResource> input){

                List<FileResource> copiedInput = new ArrayList<FileResource>();                

                for(FileResource dto : input) {

                        copiedInput.add(dto);

                }

                handleFullNames(copiedInput);

        }

        /**

         * Examines whether or not the user's full name exists in the 

         * userFullNameMap in the GSS.java for every element of the input list.

         * If the user's full name does not exist in the map then a request is being made

         * for the specific username.  

         * 

         * @param input

         */

        private void handleFullNames(List<FileResource> input){                

                if(input.isEmpty()){

                        showVersionsTable();

                        return;

                }

                if(GSS.get().findUserFullName(input.get(0).getOwner()) == null){

                        findFullNameAndUpdate(input);                

                        return;

                }

                if(input.size() >= 1){

                        input.remove(input.get(0));

                        if(input.isEmpty()){

                                showVersionsTable();                        

                        }else{

                                handleFullNames(input);

                        }

                }                                        

        }

        /**

         * Makes a request to search for full name from a given username

         * and continues checking the next element of the List.

         *  

         * @param input

         */

        private void findFullNameAndUpdate(final List<FileResource> input){                                

                final String aUserName = input.get(0).getOwner();

                String path = GSS.get().getApiPath() + "users/" + aUserName; 

                GetCommand<UserSearchResource> gg = new GetCommand<UserSearchResource>(UserSearchResource.class, path, false,null) {

                        @Override

                        public void onComplete() {

                                final UserSearchResource result = getResult();

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

                                        String username = user.getUsername();

                                        String userFullName = user.getName();

                                        GSS.get().putUserToMap(username, userFullName);

                                        if(input.size() >= 1){

                                                input.remove(input.get(0));                                                

                                                if(input.isEmpty()){

                                                        showVersionsTable();

                                                        return;

                                                }

                                                handleFullNames(input);                                                                                

                                        }                                                                        

                                }

                        }

                        @Override

                        public void onError(Throwable t) {                                

                                GSS.get().displayError("Unable to fetch user's full name from the given username " + aUserName);

                                if(input.size() >= 1){

                                        input.remove(input.get(0));

                                        handleFullNames(input);                                        

                                }

                        }

                };

                DeferredCommand.addCommand(gg);

        }

}