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/*

 * Copyright 2010 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.admin.client.ui;

import gr.ebs.gss.admin.client.ui.UsersTable.UserSorter.UserComparator;

import gr.ebs.gss.server.domain.dto.StatsDTO;

import gr.ebs.gss.server.domain.dto.UserDTO;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.Date;

import java.util.HashMap;

import java.util.Iterator;

import java.util.LinkedHashMap;

import java.util.LinkedList;

import java.util.List;

import java.util.Map;

import java.util.Set;

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

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

import com.google.gwt.gen2.table.client.AbstractColumnDefinition;

import com.google.gwt.gen2.table.client.AbstractScrollTable.ScrollPolicy;

import com.google.gwt.gen2.table.client.AbstractScrollTable.SortPolicy;

import com.google.gwt.gen2.table.client.CachedTableModel;

import com.google.gwt.gen2.table.client.CellRenderer;

import com.google.gwt.gen2.table.client.ColumnDefinition;

import com.google.gwt.gen2.table.client.DefaultRowRenderer;

import com.google.gwt.gen2.table.client.DefaultTableDefinition;

import com.google.gwt.gen2.table.client.FixedWidthGridBulkRenderer;

import com.google.gwt.gen2.table.client.MutableTableModel;

import com.google.gwt.gen2.table.client.PagingOptions;

import com.google.gwt.gen2.table.client.PagingScrollTable;

import com.google.gwt.gen2.table.client.ScrollTable;

import com.google.gwt.gen2.table.client.SelectionGrid.SelectionPolicy;

import com.google.gwt.gen2.table.client.TableDefinition;

import com.google.gwt.gen2.table.client.TableDefinition.AbstractCellView;

import com.google.gwt.gen2.table.client.TableModel;

import com.google.gwt.gen2.table.client.TableModelHelper.Request;

import com.google.gwt.gen2.table.client.TableModelHelper.Response;

import com.google.gwt.gen2.table.event.client.RowSelectionEvent;

import com.google.gwt.gen2.table.event.client.RowSelectionHandler;

import com.google.gwt.gen2.table.event.client.TableEvent.Row;

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

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

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

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

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

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.Label;

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

/**

 * @author kman

 *

 */

public class UsersTable extends Composite {

        private CachedTableModel<UserDTO> cachedTableModel = null;

        private DefaultTableDefinition<UserDTO> tableDefinition = null;

        private PagingScrollTable<UserDTO> pagingScrollTable = null;

        private Label countLabel = new Label("There are no users to display.");

        private DataSourceTableModel tableModel = null;

        private VerticalPanel vPanel = new VerticalPanel();

        private FlexTable flexTable = new FlexTable();

        /**

         * Constructor

         */

        public UsersTable() {

                super();

                pagingScrollTable = createScrollTable();

                pagingScrollTable.setHeight("200px");

                pagingScrollTable.setScrollPolicy(ScrollPolicy.DISABLED);

                PagingOptions pagingOptions = new PagingOptions(pagingScrollTable);

                flexTable.setWidget(0, 0, pagingScrollTable);

                flexTable.getFlexCellFormatter().setColSpan(0, 0, 2);

                flexTable.setWidget(1, 0, pagingOptions);

                countLabel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);

                vPanel.add(countLabel);

                vPanel.add(flexTable);

                vPanel.setWidth("100%");

                flexTable.setWidth("100%");

                super.initWidget(vPanel);

                showUsers(new ArrayList<UserDTO>());

                pagingScrollTable.setFooterGenerated(true);

        }

        /**

         *

         * @param newList the list of users to show

         */

        public void showUsers(List<UserDTO> newList) {

                countLabel.setText("There are "+ newList.size() + " users.");

                tableModel.setData(newList);

                tableModel.setRowCount(newList.size());

                cachedTableModel.clearCache();

                cachedTableModel.setRowCount(newList.size());

                pagingScrollTable.gotoPage(0, true);

                if(newList.size()<2)

                        flexTable.setWidget(1, 0, new HTML());

                else{

                        PagingOptions pagingOptions = new PagingOptions(pagingScrollTable);

                        flexTable.setWidget(1, 0, pagingOptions);

                }

        }

        public UserDTO getUserOnRow(int rowIdx){

                String id = pagingScrollTable.getDataTable().getHTML(rowIdx, 0);

                final UserDTO m = tableModel.getUserById(Long.parseLong(id));

                return m;

        }

        public UserDTO getSelectedRowObject(RowSelectionEvent event){

                Set<Row> set = event.getSelectedRows();

                if(set.size() == 1) {

                        int rowIdx = set.iterator().next().getRowIndex();

                        String id = pagingScrollTable.getDataTable().getHTML(rowIdx, 0);

                        UserDTO m = tableModel.getUserById(Long.parseLong(id));

                        return m;

                }

                return null;

        }

        public UserDTO getUser(Long id){

                return tableModel.getUserById(id);

        }

        public DialogBox createDialogBox(UserDTO m, StatsDTO s) {

                // Create a dialog box and set the caption text

                final DialogBox dialogBox = new DialogBox();

                dialogBox.setHTML("User Details: "+m.getUsername());

                // Create a table to layout the content

                VerticalPanel dialogVPanel = new VerticalPanel();

                dialogBox.setSize("50%", "50%");

                ClickHandler cancelHandler = new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                dialogBox.hide();

                        }

                };

                dialogBox.setWidget(dialogVPanel);

                dialogVPanel.add(new Label("Username: "+m.getUsername()));

                dialogVPanel.add(new Label("Email: "+m.getEmail()));

                dialogVPanel.add(new Label("Name: "+m.getName()));

                if(m.getUserClass()!=null)

                        dialogVPanel.add(new Label("Quota: "+m.getUserClass().getQuotaAsString()));

                dialogVPanel.add(new Label("File Count: "+s.getFileCount()));

                dialogVPanel.add(new Label("File Size: "+s.getFileSizeAsString()));

                dialogVPanel.add(new Label("Quota Left: "+s.getQuotaLeftAsString()));

                Button close = new Button("Close");

                close.addClickHandler(cancelHandler);

                dialogVPanel.add(close);

                // Return the dialog box

                return dialogBox;

        }

        /**

         * Initializes the scroll table

         * @return

         */

        private PagingScrollTable<UserDTO> createScrollTable() {

                // create our own table model

                tableModel = new DataSourceTableModel();

                // add it to cached table model

                cachedTableModel = createCachedTableModel(tableModel);

                // create the table definition

                TableDefinition<UserDTO> tableDef = createTableDefinition();

                // create the paging scroll table

                pagingScrollTable = new PagingScrollTable<UserDTO>(cachedTableModel, tableDef);

                pagingScrollTable.setPageSize(10);

                pagingScrollTable.setEmptyTableWidget(new HTML("There is no data to display"));

                pagingScrollTable.getDataTable().setSelectionPolicy(SelectionPolicy.ONE_ROW);

                FixedWidthGridBulkRenderer<UserDTO> bulkRenderer = new FixedWidthGridBulkRenderer<UserDTO>(pagingScrollTable.getDataTable(), pagingScrollTable);

                pagingScrollTable.setBulkRenderer(bulkRenderer);

                pagingScrollTable.setCellPadding(3);

                pagingScrollTable.setCellSpacing(0);

                pagingScrollTable.setResizePolicy(ScrollTable.ResizePolicy.FILL_WIDTH);

                pagingScrollTable.setSortPolicy(SortPolicy.SINGLE_CELL);

                return pagingScrollTable;

        }

        public void addRowSelectionHandler(RowSelectionHandler handler){

                pagingScrollTable.getDataTable().addRowSelectionHandler(handler);

        }

        /**

         * Create the {@link CachedTableModel}

         * @param aTableModel

         * @return

         */

        private CachedTableModel<UserDTO> createCachedTableModel(DataSourceTableModel aTableModel) {

                CachedTableModel<UserDTO> tm = new CachedTableModel<UserDTO>(aTableModel);

                tm.setPreCachedRowCount(20);

                tm.setPostCachedRowCount(20);

                tm.setRowCount(20);

                return tm;

        }

        private DefaultTableDefinition<UserDTO> createTableDefinition() {

                tableDefinition = new DefaultTableDefinition<UserDTO>();

                final String[] rowColors = new String[] { "#FFFFDD", "EEEEEE" };

                tableDefinition.setRowRenderer(new DefaultRowRenderer<UserDTO>(rowColors));

                // id

                {

                        IdColumnDefinition columnDef = new IdColumnDefinition();

                        columnDef.setColumnSortable(true);

                        columnDef.setColumnTruncatable(false);

                        columnDef.setPreferredColumnWidth(35);

                        columnDef.setHeader(0, new HTML("Id"));

                        columnDef.setHeaderCount(1);

                        columnDef.setHeaderTruncatable(false);

                        tableDefinition.addColumnDefinition(columnDef);

                }

                {

                        UserClassColumnDefinition columnDef = new UserClassColumnDefinition();

                        columnDef.setColumnSortable(true);

                        columnDef.setColumnTruncatable(true);

                        columnDef.setHeader(0, new HTML("User Class"));

                        columnDef.setHeaderCount(1);

                        columnDef.setHeaderTruncatable(false);

                        tableDefinition.addColumnDefinition(columnDef);

                }

                {

                        ActiveColumnDefinition columnDef = new ActiveColumnDefinition();

                        columnDef.setColumnSortable(true);

                        columnDef.setColumnTruncatable(true);

                        columnDef.setHeader(0, new HTML("Active"));

                        columnDef.setHeaderCount(1);

                        columnDef.setHeaderTruncatable(false);

                        columnDef.setCellRenderer(new CellRenderer<UserDTO, Boolean>() {

                                @Override

                                public void renderRowValue(UserDTO rowValue, ColumnDefinition<UserDTO, Boolean> aColumnDef, AbstractCellView<UserDTO> view) {

                                        CheckBox check = new CheckBox();

                                        check.setValue(aColumnDef.getCellValue(rowValue));

                                        check.setEnabled(false);

                                        view.setWidget(check);

                                }

                        });

                        tableDefinition.addColumnDefinition(columnDef);

                }

                // username

                {

                        UsernameColumnDefinition columnDef = new UsernameColumnDefinition();

                        columnDef.setColumnSortable(true);

                        columnDef.setColumnTruncatable(true);

                        columnDef.setHeader(0, new HTML("Username"));

                        columnDef.setHeaderCount(1);

                        columnDef.setHeaderTruncatable(false);

                        tableDefinition.addColumnDefinition(columnDef);

                }

                {

                        EmailColumnDefinition columnDef = new EmailColumnDefinition();

                        columnDef.setColumnSortable(true);

                        columnDef.setColumnTruncatable(true);

                        columnDef.setHeader(0, new HTML("Email"));

                        columnDef.setHeaderCount(1);

                        columnDef.setHeaderTruncatable(false);

                        tableDefinition.addColumnDefinition(columnDef);

                }

                {

                        FullNameColumnDefinition columnDef = new FullNameColumnDefinition();

                        columnDef.setColumnSortable(true);

                        columnDef.setColumnTruncatable(true);

                        columnDef.setHeader(0, new HTML("Name"));

                        columnDef.setHeaderCount(1);

                        columnDef.setHeaderTruncatable(false);

                        tableDefinition.addColumnDefinition(columnDef);

                }

                {

                        LastLoginColumnDefinition columnDef = new LastLoginColumnDefinition();

                        columnDef.setColumnSortable(true);

                        columnDef.setColumnTruncatable(true);

                        columnDef.setHeader(0, new HTML("Last Login"));

                        columnDef.setHeaderCount(1);

                        columnDef.setHeaderTruncatable(false);

                        tableDefinition.addColumnDefinition(columnDef);

                }

                return tableDefinition;

        }

        private class DataSourceTableModel extends MutableTableModel<UserDTO> {

                private Map<Long, UserDTO> map;

                private UserSorter sorter = new UserSorter();

                public void setData(List<UserDTO> list) {

                        // toss the list, index by id in a map.

                        map = new HashMap<Long, UserDTO>(list.size());

                        for(UserDTO m : list)

                                map.put(m.getId(), m);

                }

                public UserDTO getUserById(long id) {

                        return map.get(id);

                }

                @Override

                protected boolean onRowInserted(int beforeRow) {

                        return true;

                }

                @Override

                protected boolean onRowRemoved(int row) {

                        return true;

                }

                @Override

                protected boolean onSetRowValue(int row, UserDTO rowValue) {

                        return true;

                }

                @Override

                public void requestRows(

                                final Request request,

                                TableModel.Callback<UserDTO> callback) {

                        callback.onRowsReady(request, new Response<UserDTO>(){

                                @Override

                                public Iterator<UserDTO> getRowValues() {

                                        final int col = request.getColumnSortList().getPrimaryColumn();

                                        final boolean ascending = request.getColumnSortList().isPrimaryAscending();

                                        if(col < 0)

                                                map = sorter.sort(map, new UserComparator(ascending,0));

                                        else

                                                map = sorter.sort(map, new UserComparator(ascending,col));

                                        return map.values().iterator();

                                }});

                }

        }

        private final class IdColumnDefinition extends AbstractColumnDefinition<UserDTO, Long> {

                @Override

                public Long getCellValue(UserDTO rowValue) {

                        return rowValue.getId();

                }

                @Override

                public void setCellValue(UserDTO rowValue, Long cellValue) { }

        }

        private final class UsernameColumnDefinition extends

                        AbstractColumnDefinition<UserDTO, String> {

                @Override

                public String getCellValue(final UserDTO rowValue) {

                        return rowValue.getUsername();

                }

                @Override

                public void setCellValue(final UserDTO rowValue, final String cellValue) {}

        }

        private final class FullNameColumnDefinition extends

                        AbstractColumnDefinition<UserDTO, String> {

                @Override

                public String getCellValue(final UserDTO rowValue) {

                        return rowValue.getName();

                }

                @Override

                public void setCellValue(final UserDTO rowValue, final String cellValue) {}

        }

        private final class EmailColumnDefinition extends

                        AbstractColumnDefinition<UserDTO, String> {

                @Override

                public String getCellValue(final UserDTO rowValue) {

                        return rowValue.getEmail();

                }

                @Override

                public void setCellValue(final UserDTO rowValue, final String cellValue) {}

        }

        private final class UserClassColumnDefinition extends

                        AbstractColumnDefinition<UserDTO, String> {

                @Override

                public String getCellValue(final UserDTO rowValue) {

                        if(rowValue.getUserClass() != null)

                                return rowValue.getUserClass().getName();

                        return "";

                }

                @Override

                public void setCellValue(final UserDTO rowValue, final String cellValue) {}

        }

        private final class ActiveColumnDefinition extends

                        AbstractColumnDefinition<UserDTO, Boolean> {

                @Override

                public Boolean getCellValue(final UserDTO rowValue) {

                        if(rowValue.isActive() == null)

                                return true;

                        return rowValue.isActive();

                }

                @Override

                public void setCellValue(final UserDTO rowValue, final Boolean cellValue) {

                        rowValue.setActive(cellValue);

                }

        }

        private final class LastLoginColumnDefinition extends AbstractColumnDefinition<UserDTO, String> {

                @Override

                public String getCellValue(final UserDTO rowValue) {

                        if(rowValue.getLastLoginDate()==null)

                                return  "no data";

                        return DateTimeFormat.getFormat("dd/MM/yyyy hh:mm:ss tt").format(rowValue.getLastLoginDate());

                }

                @Override

                public void setCellValue(final UserDTO rowValue, final String cellValue) {}

        }

        public static class UserSorter {

                public Map<Long, UserDTO> sort(Map<Long, UserDTO> map, Comparator<UserDTO> comparator) {

                        final List<UserDTO> list = new LinkedList<UserDTO>(map.values());

                        Collections.sort(list, comparator);

                        Map<Long, UserDTO> result = new LinkedHashMap<Long, UserDTO>(list.size());

                        for(UserDTO p : list)

                                result.put(p.getId(), p);

                        return result;

                }

                public final static class UserComparator implements Comparator<UserDTO> {

                        private final boolean ascending;

                        private int property;

                        public UserComparator(boolean isAscending, int aProperty) {

                                ascending = isAscending;

                                property = aProperty;

                        }

                        @Override

                        public int compare(UserDTO m1, UserDTO m2) {

                                switch(property){

                                        case 0:

                                                if(ascending)

                                                        return m1.getId().compareTo(m2.getId());

                                                return m2.getId().compareTo(m1.getId());

                                        case 1:

                                                if(ascending)

                                                        return m1.getUserClass().getName().compareTo(m2.getUserClass().getName());

                                                return m2.getUserClass().getName().compareTo(m1.getUserClass().getName());

                                        case 2:

                                                if(ascending)

                                                        return m1.isActive().compareTo(m2.isActive());

                                                return m2.isActive().compareTo(m1.isActive());

                                        case 3:

                                                if(ascending)

                                                        return m1.getUsername().compareTo(m2.getUsername());

                                                return m2.getUsername().compareTo(m1.getUsername());

                                        case 4:

                                                if(ascending)

                                                        return m1.getEmail().compareTo(m2.getEmail());

                                                return m2.getEmail().compareTo(m1.getEmail());

                                        case 5:

                                                if(ascending)

                                                        return m1.getName().compareTo(m2.getName());

                                                return m2.getName().compareTo(m1.getName());

                                        case 6:

                                                return new DateComparator(ascending).compare(m2, m1);

                                        default:

                                }

                                String s1 = m1.getUsername();

                                String s2 = m2.getUsername();

                                if(ascending)

                                        return s1.compareTo(s2);

                                return s2.compareTo(s1);

                        }

                }

                public final static class DateComparator implements Comparator<UserDTO> {

                        private final boolean ascending;

                        public DateComparator(boolean isAscending) {

                                ascending = isAscending;

                        }

                        @Override

                        public int compare(UserDTO m1, UserDTO m2) {

                                final Date d1 = m1.getLastLoginDate();

                                final Date d2 = m2.getLastLoginDate();

                                if(d1==null && d2==null)

                                        return 0;

                                if(d1==null && d2 != null)

                                        return -1;

                                if(d2==null && d1 != null)

                                        return 1;

                                if(ascending)

                                        return d1.compareTo(d2);

                                return d2.compareTo(d1);

                        }

                }

        }

}