/*
    * Copyright (C) 2008-2010, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.transport;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.eclipse.jgit.lib.BatchingProgressMonitor;
  import org.eclipse.jgit.lib.Constants;
  
  /** Write progress messages out to the sideband channel. */
  class SideBandProgressMonitor extends BatchingProgressMonitor {
  	private final OutputStream out;
  
  	private boolean write;
  
  	SideBandProgressMonitor(OutputStream os) {
  		out = os;
  		write = true;
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	protected void onUpdate(String taskName, int workCurr) {
  		StringBuilder s = new StringBuilder();
  		format(s, taskName, workCurr);
  		s.append("   \r"); //$NON-NLS-1$
  		send(s);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	protected void onEndTask(String taskName, int workCurr) {
  		StringBuilder s = new StringBuilder();
  		format(s, taskName, workCurr);
  		s.append(", done\n"); //$NON-NLS-1$
  		send(s);
  	}
  
  	private void format(StringBuilder s, String taskName, int workCurr) {
  		s.append(taskName);
  		s.append(": "); //$NON-NLS-1$
  		s.append(workCurr);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	protected void onUpdate(String taskName, int cmp, int totalWork, int pcnt) {
  		StringBuilder s = new StringBuilder();
  		format(s, taskName, cmp, totalWork, pcnt);
  		s.append("   \r"); //$NON-NLS-1$
  		send(s);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	protected void onEndTask(String taskName, int cmp, int totalWork, int pcnt) {
  		StringBuilder s = new StringBuilder();
  		format(s, taskName, cmp, totalWork, pcnt);
  		s.append("\n"); //$NON-NLS-1$
  		send(s);
  	}
  
  	private void format(StringBuilder s, String taskName, int cmp,
  			int totalWork, int pcnt) {
  		s.append(taskName);
  		s.append(": "); //$NON-NLS-1$
  		if (pcnt < 100)
  			s.append(' ');
  		if (pcnt < 10)
  			s.append(' ');
  		s.append(pcnt);
  		s.append("% ("); //$NON-NLS-1$
  		s.append(cmp);
  		s.append("/"); //$NON-NLS-1$
  		s.append(totalWork);
  		s.append(")"); //$NON-NLS-1$
  	}
  
  	private void send(StringBuilder s) {
  		if (write) {
  			try {
  				out.write(Constants.encode(s.toString()));
  				out.flush();
  			} catch (IOException err) {
  				write = false;
  			}
  		}
  	}
  }