/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2003-2008, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs;

import java.io.PrintStream;

/**
 * Display FindBugs progress in the terminal window
 * using ASCII codes.  We assume that the terminal
 * window is at least 80 characters wide.
 * 
 * @author David Hovemeyer
 */
public class TextUIProgressCallback implements FindBugsProgress {
	private PrintStream out;
	private int goal;
	private int count;
	private int numPasses;
	private int pass;

	public TextUIProgressCallback(PrintStream out) {
		this.out = out;
	}

	public void reportNumberOfArchives(int numArchives) {
		this.goal = numArchives;
		this.count = 0;
		scanningArchives(0);
	}

	public void finishArchive() {
		scanningArchives(++count);
	}

	public void predictPassCount(int[] classesPerPass) {
		out.println();
		printMessage(classesPerPass.length + " analysis passes to perform");
		this.numPasses = classesPerPass.length;
		this.pass = 0;
	}

	public void startAnalysis(int numClasses) {
		if (pass == 0) {
			out.println();
		}
		this.goal = numClasses;
		this.count = 0;
		analyzingClasses(0);
	}

	public void finishClass() {
		analyzingClasses(++count);
	}

	public void finishPerClassAnalysis() {
		out.println();
		++pass;
		if (pass == numPasses) {
			out.println("Done with analysis");
		}
	}

	private void scanningArchives(int i) {
		String msg = String.format("Scanning archives (%d / %d)", i, goal);
		printMessage(msg);
	}

	private void analyzingClasses(int i) {
		String msg = String.format("Pass %d: Analyzing classes (%d / %d) - %02d%% complete", pass+1, i, goal, (i*100)/goal);
		printMessage(msg);
	}

	private void printMessage(String msg) {
		if (msg.length() > 79) {
			msg = msg.substring(0, 79);
		}
		out.print("\r" + msg);
	}

}
