/*
 *   Licensed to the Apache Software Foundation (ASF) under one
 *   or more contributor license agreements.  See the NOTICE file
 *   distributed with this work for additional information
 *   regarding copyright ownership.  The ASF licenses this file
 *   to you under the Apache License, Version 2.0 (the
 *   "License"); you may not use this file except in compliance
 *   with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing,
 *   software distributed under the License is distributed on an
 *   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *   KIND, either express or implied.  See the License for the
 *   specific language governing permissions and limitations
 *   under the License.
 *
 */

package org.apache.directory.fortress.web.panel;


import com.inmethod.grid.IGridColumn;
import com.inmethod.grid.column.PropertyColumn;
import com.inmethod.grid.treegrid.TreeGrid;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.attributes.AjaxCallListener;
import org.apache.wicket.ajax.attributes.AjaxRequestAttributes;
import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
import org.apache.wicket.event.IEvent;
import org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow;
import org.apache.wicket.markup.html.form.FormComponentPanel;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.PropertyModel;
import org.apache.directory.fortress.web.common.GlobalIds;
import org.apache.directory.fortress.web.control.SecUtils;
import org.apache.directory.fortress.web.model.PermListModel;
import org.apache.directory.fortress.web.event.SaveModelEvent;
import org.apache.directory.fortress.web.control.SecureIndicatingAjaxButton;
import org.apache.directory.fortress.web.control.SecureIndicatingAjaxLink;
import org.apache.directory.fortress.web.event.SelectModelEvent;
import org.apache.directory.fortress.core.model.FortEntity;
import org.apache.directory.fortress.core.model.PermObj;
import org.apache.directory.fortress.core.model.Permission;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.Model;

import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;


/**
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 * @version $Rev$
 */
public class PermListPanel extends FormComponentPanel
{
    /** Default serialVersionUID */
    private static final long serialVersionUID = 1L;
    private static final Logger LOG = LoggerFactory.getLogger( PermListPanel.class.getName() );
    private Form<?> listForm;
    private DefaultTreeModel treeModel;
    private DefaultMutableTreeNode node;
    private TreeGrid<DefaultTreeModel, DefaultMutableTreeNode, String> grid;
    private DefaultMutableTreeNode rootNode;
    private String permOperation;
    private String permObject;
    private TextField permObjectFld;
    private boolean isAdmin;


    public PermListPanel( String id, final boolean isAdmin )
    {
        super( id );

        this.isAdmin = isAdmin;
        PermListModel permListModel = new PermListModel( new Permission( "", "" ),
            isAdmin, SecUtils.getSession( this ) );
        setDefaultModel( permListModel );
        List<IGridColumn<DefaultTreeModel, DefaultMutableTreeNode, String>> columns =
            new ArrayList<>();
        PropertyColumn objName = new PropertyColumn( new Model( "Object Name" ), "userObject.ObjName" );
        objName.setInitialSize( 350 );
        columns.add( objName );
        columns.add( new PropertyColumn( new Model( "Object Id" ), "userObject.ObjId" ) );
        columns.add( new PropertyColumn( new Model( "Operation Name" ), "userObject.OpName" ) );

        PropertyColumn description = new PropertyColumn( new Model( "Description" ),
            "userObject.Description" );
        description.setInitialSize( 300 );
        columns.add( description );

        String roleAssignLabel;
        if ( isAdmin )
        {
            roleAssignLabel = "Admin Role Assignments";
        }
        else
        {
            roleAssignLabel = "RBAC Role Assignments";
        }
        PropertyColumn roles = new PropertyColumn( new Model( roleAssignLabel ), "userObject.Roles" );
        roles.setInitialSize( 500 );
        columns.add( roles );

        List<Permission> perms = ( List<Permission> ) getDefaultModel().getObject();
        treeModel = createTreeModel( perms );

        grid = new TreeGrid<DefaultTreeModel, DefaultMutableTreeNode, String>( "permtreegrid", treeModel, columns )
        {
            /** Default serialVersionUID */
            private static final long serialVersionUID = 1L;


            @Override
            public void selectItem( IModel itemModel, boolean selected )
            {
                node = ( DefaultMutableTreeNode ) itemModel.getObject();

                if ( !node.isRoot() )
                {
                    Permission perm = ( Permission ) node.getUserObject();
                    LOG.debug( "TreeGrid.addGrid.selectItem selected perm objNm: " + perm.getObjName() + " opNm: "
                        + perm.getOpName() );

                    if ( super.isItemSelected( itemModel ) )
                    {
                        LOG.debug( "TreeGrid.addGrid.selectItem item is selected" );
                        super.selectItem( itemModel, false );
                    }
                    else
                    {
                        super.selectItem( itemModel, true );
                        SelectModelEvent.send( getPage(), this, perm );
                    }
                }
            }
        };

        //grid.setContentHeight( 50, SizeUnit.EM );
        grid.setAllowSelectMultiple( false );
        grid.setClickRowToSelect( true );
        grid.setClickRowToDeselect( false );
        grid.setSelectToEdit( false );
        // expand the root node
        grid.getTreeState().expandAll();
        listForm = new Form( "form" );
        listForm.add( grid );
        grid.setOutputMarkupId( true );
        add( listForm );
        permObjectFld = new TextField( "permObject", new PropertyModel<String>( this, "permObject" ) );
        permObjectFld.setOutputMarkupId( true );

        AjaxFormComponentUpdatingBehavior ajaxUpdater = new AjaxFormComponentUpdatingBehavior( GlobalIds.ONBLUR )
        {
            /** Default serialVersionUID */
            private static final long serialVersionUID = 1L;


            @Override
            protected void onUpdate( final AjaxRequestTarget target )
            {
                target.add( permObjectFld );
            }
        };

        permObjectFld.add( ajaxUpdater );
        this.listForm.add( permObjectFld );
        TextField permOperationFld = new TextField( "permOperation", new PropertyModel<String>( this, "permOperation" ) );
        this.listForm.add( permOperationFld );
        addObjectSearchModal();

        this.listForm.add( new SecureIndicatingAjaxButton( GlobalIds.SEARCH, GlobalIds.REVIEW_MGR,
            GlobalIds.FIND_PERMISSIONS )
        {
            /** Default serialVersionUID */
            private static final long serialVersionUID = 1L;


            @Override
            protected void onSubmit( AjaxRequestTarget target )
            {
                LOG.debug( ".search onSubmit" );
                info( "Searching Perms..." );

                if ( !StringUtils.isNotEmpty( permObject ) )
                {
                    permObject = "";
                }

                if ( !StringUtils.isNotEmpty( permOperation ) )
                {
                    permOperation = "";
                }

                Permission srchPerm = new Permission( permObject, permOperation );
                setDefaultModel( new PermListModel( srchPerm, isAdmin, SecUtils.getSession( this ) ) );
                treeModel.reload();
                rootNode.removeAllChildren();
                List<Permission> perms = ( List<Permission> ) getDefaultModelObject();

                if ( CollectionUtils.isNotEmpty( perms ) )
                {
                    for ( Permission perm : perms )
                    {
                        rootNode.add( new DefaultMutableTreeNode( perm ) );
                    }

                    info( "Search returned " + perms.size() + " matching objects" );
                }
                else
                {
                    info( "No matching objects found" );
                }

                target.add( grid );
            }


            @Override
            public void onError( AjaxRequestTarget target )
            {
                LOG.warn( ".search.onError" );
                target.add();
            }


            @Override
            protected void updateAjaxAttributes( AjaxRequestAttributes attributes )
            {
                super.updateAjaxAttributes( attributes );

                AjaxCallListener ajaxCallListener = new AjaxCallListener()
                {
                    /** Default serialVersionUID */
                    private static final long serialVersionUID = 1L;


                    @Override
                    public CharSequence getFailureHandler( Component component )
                    {
                        return GlobalIds.WINDOW_LOCATION_REPLACE_COMMANDER_HOME_HTML;
                    }
                };

                attributes.getAjaxCallListeners().add( ajaxCallListener );
            }
        } );
    }


    private void addObjectSearchModal()
    {
        final ModalWindow objectsModalWindow;
        listForm.add( objectsModalWindow = new ModalWindow( "objectsearchmodal" ) );
        final ObjectSearchModalPanel objectSearchModalPanel = new ObjectSearchModalPanel(
            objectsModalWindow.getContentId(), objectsModalWindow, isAdmin );
        objectsModalWindow.setContent( objectSearchModalPanel );

        objectsModalWindow.setWindowClosedCallback( new ModalWindow.WindowClosedCallback()
        {
            /** Default serialVersionUID */
            private static final long serialVersionUID = 1L;


            @Override
            public void onClose( AjaxRequestTarget target )
            {
                PermObj permObj = objectSearchModalPanel.getSelection();

                if ( permObj != null )
                {
                    permObject = permObj.getObjName();
                    target.add( permObjectFld );
                }
            }
        } );

        listForm.add( new SecureIndicatingAjaxLink( "objectAssignLinkLbl", GlobalIds.REVIEW_MGR, "findPermObjs" )
        {
            /** Default serialVersionUID */
            private static final long serialVersionUID = 1L;


            public void onClick( AjaxRequestTarget target )
            {
                String msg = "clicked on object search";
                msg += "objectSelection: " + permObject;
                objectSearchModalPanel.setSearchVal( permObject );
                objectSearchModalPanel.setAdmin( isAdmin );
                LOG.debug( msg );
                target.prependJavaScript( GlobalIds.WICKET_WINDOW_UNLOAD_CONFIRMATION_FALSE );
                objectsModalWindow.show( target );
            }


            @Override
            protected void updateAjaxAttributes( AjaxRequestAttributes attributes )
            {
                super.updateAjaxAttributes( attributes );

                AjaxCallListener ajaxCallListener = new AjaxCallListener()
                {
                    /** Default serialVersionUID */
                    private static final long serialVersionUID = 1L;


                    @Override
                    public CharSequence getFailureHandler( Component component )
                    {
                        return GlobalIds.WINDOW_LOCATION_REPLACE_COMMANDER_HOME_HTML;
                    }
                };

                attributes.getAjaxCallListeners().add( ajaxCallListener );
            }
        } );

        String modalLabel;

        if ( isAdmin )
        {
            modalLabel = "Admin Permission Object Search Modal";
        }
        else
        {
            modalLabel = "RBAC Permission Object Search Modal";
        }

        objectsModalWindow.setTitle( modalLabel );
        objectsModalWindow.setInitialWidth( 700 );
        objectsModalWindow.setInitialHeight( 450 );
        objectsModalWindow.setCookieName( "objects-modal" );
    }


    @Override
    public void onEvent( IEvent event )
    {
        if ( event.getPayload() instanceof SaveModelEvent )
        {
            SaveModelEvent modelEvent = ( SaveModelEvent ) event.getPayload();

            switch ( modelEvent.getOperation() )
            {
                case ADD:
                    add( modelEvent.getEntity() );
                    break;

                case UPDATE:
                    /*
                    grid.markItemDirty(itemThatHasChanged);
                    grid.update();
                     */
                    modelChanged();
                    break;

                case DELETE:
                    prune();
                    break;

                case SEARCH:
                    setDefaultModel( new PermListModel( ( Permission ) modelEvent.getEntity(), isAdmin,
                        SecUtils.getSession( this ) ) );
                    treeModel.reload();
                    rootNode.removeAllChildren();

                    for ( Permission perm : ( List<Permission> ) getDefaultModelObject() )
                    {
                        rootNode.add( new DefaultMutableTreeNode( perm ) );
                    }

                    break;

                default:
                    break;
            }

            AjaxRequestTarget target = ( ( SaveModelEvent ) event.getPayload() ).getAjaxRequestTarget();
            target.add( grid );
            LOG.debug( ".onEvent SaveModelEvent: " + target.toString() );
        }
    }


    private void removeSelectedItems( TreeGrid<DefaultTreeModel, DefaultMutableTreeNode, String> grid )
    {
        Collection<IModel<DefaultMutableTreeNode>> selected = grid.getSelectedItems();

        for ( IModel<DefaultMutableTreeNode> model : selected )
        {
            DefaultMutableTreeNode node = model.getObject();
            treeModel.removeNodeFromParent( node );
            Permission perm = ( Permission ) node.getUserObject();
            LOG.debug( ".removeSelectedItems perm objNm: " + perm.getObjName() + " opNm: " + perm.getOpName() );
            List<Permission> perms = ( ( List<Permission> ) getDefaultModel().getObject() );
            perms.remove( perm );
        }
    }


    private DefaultTreeModel createTreeModel( List<Permission> perms )
    {
        DefaultTreeModel model;
        rootNode = new DefaultMutableTreeNode( null );
        model = new DefaultTreeModel( rootNode );

        if ( perms == null )
        {
            LOG.debug( ".createTreeModel no Perms found" );
        }
        else
        {
            LOG.debug( ".createTreeModel Perms found:" + perms.size() );

            for ( Permission perm : perms )
            {
                rootNode.add( new DefaultMutableTreeNode( perm ) );
            }
        }

        return model;
    }


    public void add( FortEntity entity )
    {
        if ( getDefaultModelObject() != null )
        {
            List<Permission> perms = ( ( List<Permission> ) getDefaultModelObject() );
            perms.add( ( Permission ) entity );
            treeModel.insertNodeInto( new DefaultMutableTreeNode( entity ), rootNode, 0 );
        }
    }


    public void prune()
    {
        removeSelectedItems( grid );
    }
}