/*
 * Copyright (C) 2005-2007 Alfresco Software Limited.
 *
 * This program 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 2
 * of the License, or (at your option) any later version.

 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */
package org.alfresco.repo.domain.hibernate;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.alfresco.repo.domain.DbAccessControlList;
import org.alfresco.repo.domain.hibernate.AbstractPermissionsDaoComponentImpl.CreationReport;
import org.alfresco.repo.security.permissions.ACLType;
import org.alfresco.repo.security.permissions.AccessControlEntry;
import org.alfresco.repo.security.permissions.AccessControlList;
import org.alfresco.repo.security.permissions.SimpleAccessControlListProperties;
import org.alfresco.repo.security.permissions.impl.AclChange;
import org.alfresco.service.cmr.repository.InvalidNodeRefException;
import org.alfresco.service.cmr.repository.NodeRef;

public class PermissionsDaoComponentImpl extends AbstractPermissionsDaoComponentImpl
{

    @Override
    protected CreationReport createAccessControlList(NodeRef nodeRef, boolean inherit, DbAccessControlList existing)
    {
        if (existing == null)
        {
            SimpleAccessControlListProperties properties = new SimpleAccessControlListProperties();
            properties.setAclType(ACLType.DEFINING);
            // Accept default versioning
            Long id = aclDaoComponent.createAccessControlList(properties);
            List<AclChange> changes = new ArrayList<AclChange>();
            DbAccessControlList acl = aclDaoComponent.getDbAccessControlList(id);
            changes.add(new AclDaoComponentImpl.AclChangeImpl(null, id, null, acl.getAclType()));
            changes.addAll(getACLDAO(nodeRef).setInheritanceForChildren(nodeRef, aclDaoComponent.getInheritedAccessControlList(id)));
            getACLDAO(nodeRef).setAccessControlList(nodeRef, acl);
            return new CreationReport(acl, changes);
        }
        SimpleAccessControlListProperties properties;
        Long id;
        List<AclChange> changes;
        DbAccessControlList acl;
        switch (existing.getAclType())
        {
        case OLD:
            throw new IllegalStateException("Can not mix old and new style permissions");
        case DEFINING:
            return new CreationReport(existing, Collections.<AclChange> emptyList());
        case FIXED:
        case GLOBAL:
        case SHARED:
            // create new defining, wire up and report changes to acl required.
            properties = new SimpleAccessControlListProperties();
            properties.setAclType(ACLType.DEFINING);
            properties.setInherits(existing.getInherits());
            // Accept default versioning
            id = aclDaoComponent.createAccessControlList(properties);
            changes = new ArrayList<AclChange>();
            acl = aclDaoComponent.getDbAccessControlList(id);
            changes.add(new AclDaoComponentImpl.AclChangeImpl(existing.getId(), id, existing.getAclType(), acl.getAclType()));
            changes.addAll(aclDaoComponent.mergeInheritedAccessControlList(existing.getId(), id));
            // set this to inherit to children
            changes.addAll(getACLDAO(nodeRef).setInheritanceForChildren(nodeRef, aclDaoComponent.getInheritedAccessControlList(id)));

            getACLDAO(nodeRef).setAccessControlList(nodeRef, acl);
            return new CreationReport(acl, changes);
        case LAYERED:
            // Need to get the indirected node ACL
            Long indirectAclId = getACLDAO(nodeRef).getIndirectAcl(nodeRef);
            Long inheritedAclId = getACLDAO(nodeRef).getInheritedAcl(nodeRef);

            // create new defining, wire up and report changes to acl required.
            properties = new SimpleAccessControlListProperties();
            properties.setAclType(ACLType.DEFINING);
            if (indirectAclId != null)
            {
                properties.setInherits(aclDaoComponent.getAccessControlListProperties(indirectAclId).getInherits());
            }
            // Accept default versioning
            id = aclDaoComponent.createAccessControlList(properties);
            changes = new ArrayList<AclChange>();
            acl = aclDaoComponent.getDbAccessControlList(id);
            changes.add(new AclDaoComponentImpl.AclChangeImpl(existing.getId(), id, existing.getAclType(), acl.getAclType()));
            if (indirectAclId != null)
            {
                AccessControlList indirectAcl = aclDaoComponent.getAccessControlList(indirectAclId);
                for (AccessControlEntry entry : indirectAcl.getEntries())
                {
                    if (entry.getPosition() == 0)
                    {
                        aclDaoComponent.setAccessControlEntry(id, entry);
                    }
                }
            }
            if (inheritedAclId != null)
            {
                changes.addAll(aclDaoComponent.mergeInheritedAccessControlList(inheritedAclId, id));
            }
            // set this to inherit to children
            changes.addAll(getACLDAO(nodeRef).setInheritanceForChildren(nodeRef, aclDaoComponent.getInheritedAccessControlList(id)));

            getACLDAO(nodeRef).setAccessControlList(nodeRef, acl);
            return new CreationReport(acl, changes);
        default:
            throw new IllegalStateException("Unknown type " + existing.getAclType());
        }
    }

    public void deletePermissions(NodeRef nodeRef)
    {
        DbAccessControlList acl = null;
        try
        {
            acl = getAccessControlList(nodeRef);
        }
        catch (InvalidNodeRefException e)
        {
            return;
        }
        if (acl != null)
        {
            if (acl.getInheritsFrom() != null)
            {
                Long deleted = acl.getId();
                Long inheritsFrom = acl.getInheritsFrom();
                getACLDAO(nodeRef).setAccessControlList(nodeRef, aclDaoComponent.getDbAccessControlList(inheritsFrom));
                aclDaoComponent.deleteAccessControlList(acl.getId());
                List<AclChange> changes = new ArrayList<AclChange>();
                changes.addAll(getACLDAO(nodeRef).setInheritanceForChildren(nodeRef, inheritsFrom));
                getACLDAO(nodeRef).updateChangedAcls(nodeRef, changes);
            }
            else
            {
                // TODO: could just cear out existing
                Long deleted = acl.getId();
                SimpleAccessControlListProperties properties = new SimpleAccessControlListProperties();
                properties.setAclType(ACLType.DEFINING);
                properties.setInherits(Boolean.FALSE);
                // Accept default versioning
                Long id = aclDaoComponent.createAccessControlList(properties);
                getACLDAO(nodeRef).setAccessControlList(nodeRef, aclDaoComponent.getDbAccessControlList(id));
                aclDaoComponent.deleteAccessControlList(acl.getId());
                List<AclChange> changes = new ArrayList<AclChange>();
                changes.addAll(getACLDAO(nodeRef).setInheritanceForChildren(nodeRef, id));
                getACLDAO(nodeRef).updateChangedAcls(nodeRef, changes);
            }
        }
    }

}