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/*  Copyright 1999 Vince Via [email protected]
    Licensed 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 "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
package com.viaoa.sync.file;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.logging.Logger;
import com.viaoa.sync.OASync;
import com.viaoa.util.OAString;

/**
 * Send/receive files from ServerFile using multiplexer socket.
 * Used by OASyncClient
 * @author vvia
 */
public class ClientFile {
    
    private static Logger LOG = Logger.getLogger(ClientFile.class.getName());
 
    /**
     * Download file from server and save to file.
     */
    public boolean download(String fname, File fileSaveAs) throws Exception {
        LOG.fine("download fname="+fname+", save as file="+fileSaveAs);
        if (OAString.isEmpty(fname) || fileSaveAs == null) return false;
        final Socket socket = OASync.getSyncClient().getRemoteMultiplexerClient().getMultiplexerClient().createSocket(ServerFile.FileDownload);
        
        DataInputStream dis = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
        DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));

        dos.writeUTF(fname);
        dos.flush();
        
        if (fileSaveAs.exists()) fileSaveAs.delete();
        fileSaveAs.createNewFile();
        
        int x = dis.readInt();
        final boolean bValid = (x == 2);
        LOG.fine("download fname="+fname+", save as file="+fileSaveAs+", return value="+2+", valid="+bValid);

        if (bValid) {
            OutputStream osFile = new FileOutputStream(fileSaveAs);
            
            final byte[] bs = new byte[8196];
            int total = 0;
            for ( ; ; ) {
                final int xAmt = dis.readInt();
                if (xAmt <= 0) break;

                int tot = 0;
                for ( ;tot < xAmt; ) {
                    x = Math.min(bs.length, xAmt-tot);
                    x = dis.read(bs, 0, x);
                    osFile.write(bs, 0, x);
                    tot += x;
                }
                total += xAmt;
                status(total);
            }
            osFile.close();
            LOG.fine("download finished, fname="+fname+", save as file="+fileSaveAs+", size="+total);
        }
        dos.writeInt(0); // done
        dos.flush();
        
        dos.close();
        dis.close();
        socket.close();
        return bValid;
    }
    
    
    public boolean upload(String fname, File fileOpen) throws IOException {
        LOG.fine("upload to fname="+fname+", from file="+fileOpen);
        if (OAString.isEmpty(fname) || fileOpen == null) return false;
        Socket socket = OASync.getSyncClient().getRemoteMultiplexerClient().getMultiplexerClient().createSocket(ServerFile.FileUpload);

        DataInputStream dis = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
        DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
        
        dos.writeUTF(fname);
        dos.flush();

        final boolean bValid = (dis.readInt() == 1);
        LOG.fine("upload to fname="+fname+", from file="+fileOpen+", valid="+bValid);
        
        if (bValid) {
            final BufferedInputStream bisFile = new BufferedInputStream(new FileInputStream(fileOpen));
            final byte[] bs = new byte[8196];
            
            int total = 0;
            for (int i=0;;i++) {
                int x = bisFile.read(bs, 0, bs.length);
                dos.writeInt(Math.max(x, 0));
                if (x <= 0) break;
                dos.write(bs, 0, x);
                total += x;
                status(total);
            }
            bisFile.close();
            LOG.fine("upload finished, to fname="+fname+", from file="+fileOpen+", size="+total);
            dos.flush();
        }
        // wait for server to finsih reading
        dis.readInt();
        
        dos.close();
        dis.close();
        socket.close();
        return bValid;
    }
    
    protected void status(int x) {
    }
}