package org.apache.maven.cli;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * 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
 * "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.
 */

import java.io.PrintStream;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.maven.repository.ArtifactTransferEvent;
import org.apache.maven.repository.ArtifactTransferResource;

/**
 * Console download progress meter.
 * 
 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
 */
class ConsoleMavenTransferListener
    extends AbstractMavenTransferListener
{

    private Map<ArtifactTransferResource, Long> downloads =
        Collections.synchronizedMap( new LinkedHashMap<ArtifactTransferResource, Long>() );

    private int lastLength;

    public ConsoleMavenTransferListener( PrintStream out )
    {
        super( out );
    }

    @Override
    protected void doProgress( ArtifactTransferEvent transferEvent )
    {
        ArtifactTransferResource resource = transferEvent.getResource();
        downloads.put( resource, Long.valueOf( transferEvent.getTransferredBytes() ) );

        StringBuilder buffer = new StringBuilder( 64 );

        for ( Map.Entry<ArtifactTransferResource, Long> entry : downloads.entrySet() )
        {
            long total = entry.getKey().getContentLength();
            long complete = entry.getValue().longValue();

            buffer.append( getStatus( complete, total ) ).append( "  " );
        }

        int pad = lastLength - buffer.length();
        lastLength = buffer.length();
        pad( buffer, pad );
        buffer.append( '\r' );

        out.print( buffer );
    }

    private String getStatus( long complete, long total )
    {
        if ( total >= 1024 )
        {
            return toKB( complete ) + "/" + toKB( total ) + " KB ";
        }
        else if ( total >= 0 )
        {
            return complete + "/" + total + " B ";
        }
        else if ( complete >= 1024 )
        {
            return toKB( complete ) + " KB ";
        }
        else
        {
            return complete + " B ";
        }
    }

    private void pad( StringBuilder buffer, int spaces )
    {
        String block = "                                        ";
        while ( spaces > 0 )
        {
            int n = Math.min( spaces, block.length() );
            buffer.append( block, 0, n );
            spaces -= n;
        }
    }

    @Override
    public void transferCompleted( ArtifactTransferEvent transferEvent )
    {
        downloads.remove( transferEvent.getResource() );

        StringBuilder buffer = new StringBuilder( 64 );
        pad( buffer, lastLength );
        buffer.append( '\r' );
        out.print( buffer );

        super.transferCompleted( transferEvent );
    }

}

@@ -877,27 +877,19 @@
 va.util.
-Collections
+Map
 ;%0Aimport
@@ -903,40 +903,33 @@
 til.
-LinkedHashMap;%0Aimport java.util.
+concurrent.ConcurrentHash
 Map;
@@ -1303,56 +1303,23 @@
 ds =
-%0A        Collections.synchronizedMap( new Linked
+ new Concurrent
 Hash
@@ -1355,18 +1355,16 @@
  Long%3E()
- )
 ;%0A%0A    p

reimplement parallel artifacts download Prevent possible ConcurrentModificationException