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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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
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package com.sun.star.script.framework.io;

import com.sun.star.frame.XModel;

import com.sun.star.container.XNameAccess;

import com.sun.star.uno.XInterface;
import com.sun.star.uno.UnoRuntime;

import com.sun.star.lang.XComponent;

import com.sun.star.uno.AnyConverter;

import com.sun.star.io.XStream;
import com.sun.star.io.XInputStream;
import com.sun.star.io.XOutputStream;

import com.sun.star.embed.XStorage;
import com.sun.star.embed.XTransactedObject;

import com.sun.star.document.XDocumentSubStorageSupplier;

import com.sun.star.beans.XPropertySet;

import com.sun.star.lang.XEventListener;
import com.sun.star.lang.EventObject;

import com.sun.star.script.framework.log.LogUtils;
import com.sun.star.script.framework.provider.PathUtils;

import java.util.*;
import java.io.*;


public class XStorageHelper implements XEventListener
{
    XStorage[] xStorages;
    XStream xStream; 
    XInputStream xIs = null;
    XOutputStream xOs = null;
    static Map modelMap = new HashMap();
    XModel xModel = null;
    private static XStorageHelper listener = new XStorageHelper();

    private XStorageHelper() {}
    public XStorageHelper(  String path, int mode, boolean create ) throws IOException
    {
        String modelUrl = null;
        int indexOfScriptsDir = path.lastIndexOf( "Scripts" );
        if ( indexOfScriptsDir > -1 )
        {
            modelUrl = path.substring( 0, indexOfScriptsDir - 1 );
            path = path.substring( indexOfScriptsDir, path.length());
        }
            
        LogUtils.DEBUG("XStorageHelper ctor, path: " + path);
        this.xModel =  getModelForURL( modelUrl );
            
        try 
        {
            StringTokenizer tokens = new StringTokenizer(path, "/");

            if (tokens.countTokens() == 0) 
            {
               throw new IOException("Invalid path");
            }
            XDocumentSubStorageSupplier xDocumentSubStorageSupplier =
                (XDocumentSubStorageSupplier) UnoRuntime.queryInterface(
                    XDocumentSubStorageSupplier.class, xModel); 
            xStorages =  new XStorage[tokens.countTokens()  ];
            LogUtils.DEBUG("XStorageHelper ctor, path chunks length: " + xStorages.length );

            for ( int i = 0; i < xStorages.length; i++ )
            {
                LogUtils.DEBUG("XStorageHelper, processing index " + i );
                String name = tokens.nextToken();
                LogUtils.DEBUG("XStorageHelper, getting: " + name);
                XStorage storage = null;
                if ( i == 0 )
                {
                    storage  = xDocumentSubStorageSupplier.getDocumentSubStorage( name, mode );
                    if ( storage == null )
                    {
                        LogUtils.DEBUG("** boo hoo Storage is null " );
                    }
                    XPropertySet xProps = (XPropertySet)UnoRuntime.queryInterface(XPropertySet.class,storage );
                    if ( xProps != null )
                    {
                        String mediaType = AnyConverter.toString( xProps.getPropertyValue( "MediaType" ) );
                        LogUtils.DEBUG("***** media type is " + mediaType );
                        if ( !mediaType.equals("scripts") )
                        { 
                            xProps.setPropertyValue("MediaType","scripts");
                        }
                    }
                }
                else
                {
                    XNameAccess xNameAccess = (XNameAccess)
                    UnoRuntime.queryInterface(XNameAccess.class, xStorages[i-1]);
                    if (xNameAccess == null )
                    {
                        disposeObject();
                        throw new IOException("No name access " + name);
                    }
                    else if ( !xNameAccess.hasByName(name) || !xStorages[i-1].isStorageElement(name) )
                    {
                        if ( !create )
                        {
                            disposeObject();
                            throw new IOException("No subdir: " + name);
                        } 
                        else
                        {
                            // attempt to create new storage
                            LogUtils.DEBUG("Attempt to create new storage for " + name );
                        }
                    }

                    storage = xStorages[i-1].openStorageElement(
                        name, mode );
                }
                if ( storage == null )
                {
                    disposeObject();
                    throw new IOException("storage not found: " + name);
                }
                xStorages[ i ] = storage;
                   
            }
        }
        catch ( com.sun.star.io.IOException ioe) 
        {
            disposeObject();
        }
        catch (com.sun.star.uno.Exception e) 
        {
            disposeObject();
            throw new IOException(e.getMessage());
        }
    }

    public synchronized static void addNewModel( XModel model )
    {
        // TODO needs to cater for model for untitled document
        modelMap.put( PathUtils.getOidForModel( model ), model );
        XComponent xComp = (XComponent)
             UnoRuntime.queryInterface(XComponent.class, model);

        if ( xComp != null )
        {
            try
            {
                xComp.addEventListener( listener );
            }
            catch ( Exception e )
            {
                // What TODO here ?
                LogUtils.DEBUG( LogUtils.getTrace( e ) );
            }
        }
    }

    public void disposing( EventObject Source )
    {
        XModel model = (XModel)
            UnoRuntime.queryInterface(XModel.class,Source.Source );

        if ( model != null )
        {
            LogUtils.DEBUG(" Disposing doc " + model.getURL() );
            Object result = modelMap.remove( model );
            result = null;
        }
    } 
    public XStorage getStorage() 
    {
        return xStorages[ xStorages.length - 1 ];
    }
    public XModel getModel()
    {
        return xModel;
    }
    public void disposeObject()
    {
        disposeObject( false );
    }
    public void disposeObject( boolean shouldCommit )
    {
        LogUtils.DEBUG("In disposeObject");

        for ( int i = xStorages.length -1 ; i > -1; i-- )
        {
            LogUtils.DEBUG("In disposeObject disposing storage " + i );
            try
            {
                XStorage xStorage = xStorages[i];
                if ( shouldCommit )
                {
                    commit(xStorage); 
                }
                disposeObject(xStorage);
                LogUtils.DEBUG("In disposeObject disposed storage " + i );
            }
            catch( Exception ignore )
            {
                LogUtils.DEBUG("Exception disposing storage " + i );
            }
             
        }
            
    }
    static public void disposeObject( XInterface xInterface )
    {
        if (xInterface == null) {
            return;
        }

        XComponent xComponent = (XComponent)
        UnoRuntime.queryInterface(XComponent.class, xInterface);

        if (xComponent == null) {
            return;
        }
        xComponent.dispose();
    }
    static public void commit( XInterface xInterface )
    {
        XTransactedObject xTrans = (XTransactedObject)
        UnoRuntime.queryInterface(XTransactedObject.class, xInterface);
        if ( xTrans != null )
        {
            try
            {
                xTrans.commit();
            }
            catch ( Exception e )
            {
                LogUtils.DEBUG("Something went bellyup exception: " + e );
            }
        } 
    }

    public XModel getModelForURL( String url )
    {
       //TODO does not cater for untitled documents
       return (XModel)modelMap.get( url );
    }

} 

