/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.geoserver.security.web.user;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.wicket.markup.html.form.ChoiceRenderer;
import org.apache.wicket.markup.html.form.SubmitLink;
import org.apache.wicket.model.IModel;
import org.geoserver.security.GeoServerSecurityManager;
import org.geoserver.security.impl.GeoServerUser;
import org.geoserver.security.impl.GeoServerUserGroup;
import org.geoserver.security.web.PaletteFormComponent;
import org.geoserver.security.web.group.NewGroupPage;
import org.geoserver.web.GeoServerApplication;

/**
 * A form component that can be used to edit user to group assignments
 */
public class UserGroupPaletteFormComponent extends PaletteFormComponent<GeoServerUserGroup> {

    private static final long serialVersionUID = 1L;

    GeoServerUser user;

    public UserGroupPaletteFormComponent(String id, String ugServiceName, GeoServerUser user) {
        this(id, new SelectedGroupsModel(ugServiceName, user), ugServiceName, user);
    }

    public UserGroupPaletteFormComponent(String id, IModel<List<GeoServerUserGroup>> model, 
        final String ugServiceName, GeoServerUser user) {
        super(id, model, (IModel) new GroupsModel(ugServiceName), 
            new ChoiceRenderer<GeoServerUserGroup>("groupname", "groupname"));

        add(new SubmitLink("addGroup") {
            @Override
            public void onSubmit() {
                setResponsePage(new NewGroupPage(ugServiceName).setReturnPage(this.getPage()));
            }
        });
    }

    public List<GeoServerUserGroup> getSelectedGroups() {
        return new ArrayList(palette.getModelCollection());
    }

    public void diff(Collection<GeoServerUserGroup> orig, Collection<GeoServerUserGroup> add, 
        Collection<GeoServerUserGroup> remove) {
        
        remove.addAll(orig);
        for (GeoServerUserGroup group : getSelectedGroups()) {
            if (!orig.contains(group)) {
                add.add(group);
            }
            else {
                remove.remove(group);
            }
        }
    }

    static class SelectedGroupsModel implements IModel<List<GeoServerUserGroup>> {
        List<GeoServerUserGroup> groups;

        public SelectedGroupsModel(String ugServiceName, GeoServerUser user) {
            try {
                GeoServerSecurityManager secMgr = GeoServerApplication.get().getSecurityManager();
                setObject(new ArrayList(secMgr.loadUserGroupService(ugServiceName).getGroupsForUser(user)));
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

        @Override
        public List<GeoServerUserGroup> getObject() {
            return groups;
        }

        @Override
        public void setObject(List<GeoServerUserGroup> object) {
            this.groups = object;
        }

        @Override
        public void detach() {
        }

    }
    
    @Override
    protected String getSelectedHeaderPropertyKey() {
        return "UserGroupPaletteFormComponent.selectedHeader";
    }
    
    @Override
    protected String getAvaliableHeaderPropertyKey() {
        return "UserGroupPaletteFormComponent.availableHeader";
    }
}