/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (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.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Darin Fisher <darin@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsFileTransport_h__
#define nsFileTransport_h__

#include "nsITransport.h"
#include "nsIRequest.h"
#include "nsIRunnable.h"
#include "nsFileSpec.h"
#include "prlock.h"
#include "nsIEventQueueService.h"
#include "nsIPipe.h"
#include "nsILoadGroup.h"
#include "nsCOMPtr.h"
#include "nsIStreamListener.h"
#include "nsIStreamProvider.h"
#include "nsIProgressEventSink.h"
#include "nsIInputStream.h"
#include "nsIOutputStream.h"
#include "nsIStreamIO.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIFile.h"
#include "prlog.h"
#include "nsFileTransportService.h"

//#define TIMING

class nsIInterfaceRequestor;

class nsFileTransportSourceWrapper;
class nsFileTransportSinkWrapper;

class nsFileTransport : public nsITransport, 
                        public nsITransportRequest,
                        public nsIRunnable
{
public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSITRANSPORT
    NS_DECL_NSIREQUEST
    NS_DECL_NSITRANSPORTREQUEST
    NS_DECL_NSIRUNNABLE

    nsFileTransport();
    // Always make the destructor virtual: 
    virtual ~nsFileTransport();

    // Define a Create method to be used with a factory:
    static NS_METHOD
    Create(nsISupports* aOuter, const nsIID& aIID, void* *aResult);
    
    nsresult Init(nsFileTransportService *aService, nsIFile* file,
                  PRInt32 ioFlags,
                  PRInt32 perm);
    nsresult Init(nsFileTransportService *aService, const char* name, 
                  nsIInputStream* fromStream,
                  const char* contentType,
                  PRInt32 contentLength,
                  PRBool closeStreamWhenDone);
    nsresult Init(nsFileTransportService *aService, nsIStreamIO* io);

    void Process(nsIProgressEventSink *);
    void DoClose(void);

    enum XferState {
        CLOSED,
        OPEN_FOR_READ,
        START_READ,
        READING,
        END_READ,
        OPEN_FOR_WRITE,
        START_WRITE,
        WRITING,
        END_WRITE,
        CLOSING
    };

    enum RunState {
        RUNNING,
        SUSPENDED,
        CANCELED
    };

protected:
    nsCOMPtr<nsIProgressEventSink>      mProgressSink;
    nsCOMPtr<nsIInterfaceRequestor>     mNotificationCallbacks;
    nsCOMPtr<nsIStreamIO>               mStreamIO;
    char                               *mContentType;
    PRUint32                            mBufferSegmentSize;
    PRUint32                            mBufferMaxSize;

    nsCOMPtr<nsISupports>               mContext;

    // mXferState is only changed by the file transport thread:
    XferState                           mXferState;

    // mRunState is only changed by the user's thread, but looked at by the
    // file transport thread:
    RunState                            mRunState;
    nsresult                            mCancelStatus;
    PRInt32                             mSuspendCount;
    PRLock                             *mLock;

    // The transport is active if it is currently being processed by a thread.
    PRBool                              mActive;

    // If FALSE, then the caller can reuse the file transport
    PRBool                              mCloseStreamWhenDone;
    // state variables:
    nsresult                            mStatus;
    PRUint32                            mOffset;
    PRInt32                             mTotalAmount;
    PRInt32                             mTransferAmount;

    // reading state variables:
    nsCOMPtr<nsIStreamListener>         mListener;
    nsFileTransportSourceWrapper       *mSourceWrapper;

    // writing state variables:
    nsCOMPtr<nsIStreamProvider>         mProvider;
    nsCOMPtr<nsIOutputStream>           mSink;
    nsFileTransportSinkWrapper         *mSinkWrapper;

    nsCString                           mStreamName;
    nsFileTransportService             *mService;

#ifdef TIMING
    PRIntervalTime mStartTime;
#endif
};

#define NS_FILE_TRANSPORT_DEFAULT_SEGMENT_SIZE   (4096)
#define NS_FILE_TRANSPORT_DEFAULT_BUFFER_SIZE    (4*4096) // 16k max

#endif // nsFileTransport_h__