/*
 * #%L
 * Alfresco Repository
 * %%
 * Copyright (C) 2005 - 2016 Alfresco Software Limited
 * %%
 * This file is part of the Alfresco software. 
 * If the software was purchased under a paid Alfresco license, the terms of 
 * the paid license agreement will prevail.  Otherwise, the software is 
 * provided under the following open source license terms:
 * 
 * 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/>.
 * #L%
 */
package org.alfresco.filesys.repo;

import java.util.regex.Pattern;

import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.filesys.alfresco.AlfrescoContext;
import org.alfresco.filesys.alfresco.AlfrescoDiskDriver;
import org.alfresco.filesys.alfresco.IOControlHandler;
import org.alfresco.filesys.alfresco.PseudoFileOverlay;
import org.alfresco.filesys.config.acl.AccessControlListBean;
import org.alfresco.jlan.server.config.CoreServerConfigSection;
import org.alfresco.jlan.server.core.DeviceContextException;
import org.alfresco.jlan.server.filesys.DiskInterface;
import org.alfresco.jlan.server.filesys.DiskSharedDevice;
import org.alfresco.jlan.server.filesys.FileName;
import org.alfresco.jlan.server.filesys.FileSystem;
import org.alfresco.jlan.server.filesys.cache.FileStateLockManager;
import org.alfresco.jlan.server.filesys.quota.QuotaManagerException;
import org.alfresco.jlan.server.thread.ThreadRequestPool;
import org.alfresco.service.cmr.repository.NodeRef;

/**
 * Content Filesystem Context Class
 * 
 * <p>Contains per filesystem context.
 * 
 * @author GKSpencer
 */
public class ContentContext extends AlfrescoContext
{
    // Store and root path
    
    private String m_storeName;
    private String m_rootPath;
    
    // Root node
    
    private NodeRef m_rootNodeRef;
    
    private String m_relativePath;
    
    private boolean m_offlineFiles;
    
    private boolean m_disableNodeMonitor;
    
    // Disable change notifications for CIFS
    
    private boolean m_disableChangeNotifications;
    
    private AccessControlListBean m_accessControlList;
        
    // File state based lock/oplock manager
    
    private FileStateLockManager m_lockManager;

    // Enable/disable oplocks
    
    private boolean m_oplocksDisabled;
    
    // Node monitor
    
    private NodeMonitor m_nodeMonitor;
    
    private PseudoFileOverlay m_PseudoFileOverlay;

    // Thread pool
    
    private ThreadRequestPool m_threadPool;
    
    // pattern is tested against full path after it has been lower cased.
    private Pattern renameShufflePattern = Pattern.compile("(.*[a-f0-9]{8}+$)|(.*\\.tmp$)|(.*\\.wbk$)|(.*\\.bak$)|(.*\\~$)");
    
    /**
     * Default constructor allowing initialization by container.
     */
    public ContentContext()
    {
//        // Create the I/O control handler
        
//        setIOHandler( createIOHandler( null));
    }
    
    /**
     * Class constructor
     * 
     *@param deviceName
     *            String
     * @param storeName
     *            String
     * @param rootPath
     *            String
     * @param rootNodeRef
     *            NodeRef
     */
    public ContentContext(String deviceName, String storeName, String rootPath, NodeRef rootNodeRef)
    {       
        setDeviceName(deviceName);
        setStoreName(storeName);
        setRootPath(rootPath);
        setRootNodeRef(rootNodeRef);
    }

    public void setStoreName(String name)
    {
        m_storeName = name;
    }

    public void setRootPath(String path)
    {
        m_rootPath = path;
    }

    public void setRelativePath(String path)
    {
        // Make sure the path is in CIFS format
        m_relativePath = path.replace( '/', FileName.DOS_SEPERATOR);;
    }

    public void setOfflineFiles(boolean offlineFiles)
    {
        m_offlineFiles = offlineFiles;
    }        

    public void setDisableNodeMonitor(boolean disableNodeMonitor)
    {
        m_disableNodeMonitor = disableNodeMonitor;
    }        

    /**
     * Disable change notifications
     * 
     * @param disableChangeNotify boolean
     */
    public void setDisableChangeNotifications( boolean disableChangeNotify) {
        m_disableChangeNotifications = disableChangeNotify;
    }
    
    public void setAccessControlList(AccessControlListBean accessControlList)
    {
        m_accessControlList = accessControlList;
    }

    public void setRootNodeRef(NodeRef nodeRef)
    {
        m_rootNodeRef = nodeRef;
        setShareName(nodeRef.toString());
    }


    /**
     * Enable/disable oplock support
     * 
     * @param disableOplocks boolean
     */
    public void setDisableOplocks( boolean disableOplocks) {
    	m_oplocksDisabled = disableOplocks;
    }

    /**
     * Get the regular expression pattern that will be applied to detected potential
     * rename shuffles.
     * 
     * @return                          the regular expression pattern to match against
     */
    public Pattern getRenameShufflePattern()
    {
        return renameShufflePattern;
    }

    /**
     * Set the regular expression that will be applied to filenames during renames
     * to detect whether clients are performing a renaming shuffle - common during
     * file saving on various clients.
     * <p/>
     * <b>ALF-3856</b>
     * 
     * @param renameShufflePattern      a regular expression filename match
     */
    public void setRenameShufflePattern(Pattern renameShufflePattern)
    {
        this.renameShufflePattern = renameShufflePattern;
    }

    @Override
    public void initialize(AlfrescoDiskDriver filesysDriver)
    {
        super.initialize(filesysDriver);

        if (m_storeName == null || m_storeName.length() == 0)
        {
            throw new AlfrescoRuntimeException("Device missing storeName");
        }
        
        if (m_rootPath == null || m_rootPath.length() == 0)
        {
            throw new AlfrescoRuntimeException("Device missing rootPath");
        }
        
        // Enable file state caching
        
        getStateCache().setCaseSensitive( false);

        // Create the file state based lock manager
        
        m_lockManager = new FileStateLockManager( getStateCache());        
    }
    
    /**
     * Return the filesystem type, either FileSystem.TypeFAT or FileSystem.TypeNTFS.
     * 
     * @return String
     */
    public String getFilesystemType()
    {
        return FileSystem.TypeNTFS;
    }
    
    /**
     * Return the store name
     * 
     * @return String
     */
    public final String getStoreName()
    {
        return m_storeName;
    }
    
    /**
     * Return the root path
     * 
     * @return String
     */
    public final String getRootPath()
    {
        return m_rootPath;
    }
    
    /**
     * Return the relative path
     * 
     * @return String
     */
    public String getRelativePath()
    {
        return m_relativePath;
    }

    
    /**
     * Determines whether locked files should be marked as offline.
     * 
     * @return <code>true</code> if locked files should be marked as offline
     */
    public boolean getOfflineFiles()
    {
        return m_offlineFiles;
    }

    /**
     * Determines whether a node monitor is required.
     * 
     * @return <code>true</code> if a node monitor is required
     */
    public boolean getDisableNodeMonitor()
    {
        return m_disableNodeMonitor;
    }

    /**
     * Determine if oplocks support should be disabled
     * 
     * @return boolean
     */
    public boolean getDisableOplocks() {
    	return m_oplocksDisabled;
    }
    
    /**
     * Return the lock manager
     * 
     * @return FileStateLockManager
     */
    public FileStateLockManager getLockManager() {
        return m_lockManager;
    }

    /**
     * Determine if change notifications are disabled
     * 
     * @return boolean
     */
    public boolean getDisableChangeNotifications() {
        return m_disableChangeNotifications;
    }
    
    /**
     * Gets the access control list.
     * 
     * @return the access control list
     */
    public AccessControlListBean getAccessControlList()
    {
        return m_accessControlList;
    }

    /**
     * Return the root node
     * 
     * @return NodeRef
     */
    public final NodeRef getRootNode()
    {
        return m_rootNodeRef;
    }

    /**
     * Return the thread pool
     * 
     * @return ThreadRequestPool
     */
    public final ThreadRequestPool getThreadPool() {
        return m_threadPool;
    }
    
    /**
     * Close the filesystem context
     */
    public void CloseContext() {

        // Stop the node monitor, if enabled
        
        if ( m_nodeMonitor != null)
            m_nodeMonitor.shutdownRequest();
        
        //  Stop the quota manager, if enabled
        
        if ( hasQuotaManager()) {
            try {
                getQuotaManager().stopManager(null, this);
            }
            catch ( QuotaManagerException ex) {
            }
        }
        
        //  Call the base class
        
        super.CloseContext();
    }
    
//    /**
//     * Create the I/O control handler for this filesystem type
//     * 
//     * @param filesysDriver DiskInterface
//     * @return IOControlHandler
//     */
//    protected IOControlHandler createIOHandler( DiskInterface filesysDriver)
//    {
//        return new ContentIOControlHandler();
//    }
    
    /**
     * Set the node monitor
     * 
     * @param nodeMonitor node monitor
     */
    protected void setNodeMonitor( NodeMonitor nodeMonitor) {
        m_nodeMonitor = nodeMonitor;
    }

    /**
     * Start the filesystem
     * 
     * @param share DiskSharedDevice
     * @exception DeviceContextException
     */
    public void startFilesystem(DiskSharedDevice share)
        throws DeviceContextException {
        

        // Call the base class
        
        super.startFilesystem(share);

        if ( getStateCache() != null)
        	getStateCache().setCaseSensitive( false);
        
        // Find the thread pool via the configuration
        
        CoreServerConfigSection coreConfig = (CoreServerConfigSection) share.getConfiguration().getConfigSection( CoreServerConfigSection.SectionName);
        if ( coreConfig != null)
            m_threadPool = coreConfig.getThreadPool();
        
        // Start the lock manager, use the thread pool if available
        
        if ( getLockManager() != null) {
                    
            // Start the lock manager
            
            m_lockManager.startLockManager( "OplockExpire_" + share.getName(), m_threadPool);
        }

        // Start the node monitor, if enabled
        
        if ( m_nodeMonitor != null)
            m_nodeMonitor.startMonitor();
    }

    public void setPseudoFileOverlay(PseudoFileOverlay pseudoFileOverlay)
    {
        this.m_PseudoFileOverlay = pseudoFileOverlay;
    }

    public PseudoFileOverlay getPseudoFileOverlay()
    {
        return m_PseudoFileOverlay;
    }
}