/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.usage;

import java.io.Serializable;
import java.util.Map;

import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.model.ContentModel;
import org.alfresco.repo.node.NodeServicePolicies;
import org.alfresco.repo.policy.JavaBehaviour;
import org.alfresco.repo.policy.PolicyComponent;
import org.alfresco.repo.security.authentication.AuthenticationUtil;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.security.AuthorityService;
import org.alfresco.service.cmr.usage.ContentUsageService;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;

/**
 * Implements policies/behaviour for protecting system/admin-maintained person properties
 *
 */
public class UsageQuotaProtector implements NodeServicePolicies.OnUpdatePropertiesPolicy
{
    private AuthorityService authorityService;
    private PolicyComponent policyComponent;
    private ContentUsageService contentUsageService;
    
    public void setAuthorityService(AuthorityService authorityService)
    {
        this.authorityService = authorityService;
    }
    
    public void setContentUsageService(ContentUsageService contentUsageService)
    {
        this.contentUsageService = contentUsageService;
    }
        
    public void setPolicyComponent(PolicyComponent policyComponent)
    {
        this.policyComponent = policyComponent;
    }
    
    /**
     * The initialise method     
     */
    public void init()
    {    
        if (contentUsageService.getEnabled())
        {
            // Register interest in the onUpdateProperties policy
            policyComponent.bindClassBehaviour(
                    QName.createQName(NamespaceService.ALFRESCO_URI, "onUpdateProperties"), 
                    ContentModel.TYPE_PERSON, 
                    new JavaBehaviour(this, "onUpdateProperties"));
        }
    }    
    
    /**
     * Called after a node's properties have been changed.
     * 
     * @param nodeRef reference to the updated node
     * @param before the node's properties before the change
     * @param after the node's properties after the change 
     */
    public void onUpdateProperties(
            NodeRef nodeRef,
            Map<QName, Serializable> before,
            Map<QName, Serializable> after)
    {    
        Long sizeCurrentBefore = (Long)before.get(ContentModel.PROP_SIZE_CURRENT);
        Long sizeCurrentAfter = (Long)after.get(ContentModel.PROP_SIZE_CURRENT); 
            
        Long sizeQuotaBefore = (Long)before.get(ContentModel.PROP_SIZE_QUOTA);
        Long sizeQuotaAfter = (Long)after.get(ContentModel.PROP_SIZE_QUOTA); 
        
        // Check for change in sizeCurrent
        if ((sizeCurrentBefore != sizeCurrentAfter) && (sizeCurrentBefore != null) &&
            (! (authorityService.hasAdminAuthority() || AuthenticationUtil.isRunAsUserTheSystemUser())))
        {
            throw new AlfrescoRuntimeException("Update failed: protected property 'sizeCurrent'");
        }
        
        // Check for change in sizeQuota
        if ((sizeQuotaBefore != sizeQuotaAfter) && (sizeQuotaBefore != null) &&
            (! (authorityService.hasAdminAuthority() || AuthenticationUtil.isRunAsUserTheSystemUser())))
        {
            throw new AlfrescoRuntimeException("Update failed: protected property 'sizeQuota'");
        }
    }
}