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package org.netbeans.lib.profiler.heap;

import javax.swing.BoundedRangeModel;
import javax.swing.DefaultBoundedRangeModel;
import javax.swing.SwingUtilities;


/**
 * @author Tomas Hurka
 */
public final class HeapProgress {

    public static final int PROGRESS_MAX = 1000;
    private static ThreadLocal progressThreadLocal = new ThreadLocal();

    private HeapProgress() {

    }

    public static BoundedRangeModel getProgress() {
        BoundedRangeModel model = (BoundedRangeModel) progressThreadLocal.get();

        if (model == null) {
            model = new DefaultBoundedRangeModel(0,0,0,PROGRESS_MAX);
            progressThreadLocal.set(model);
        }
        return model;
    }

    static void progress(long counter, long startOffset, long value, long endOffset) {
        // keep this method short so that it can be inlined
        if (counter % 100000 == 0) {
            progress(value, endOffset, startOffset);
        }
    }

    static void progress(long value, long endValue) {
        progress(value,0,value,endValue);
    }

    private static void progress(final long value, final long endOffset, final long startOffset) {
        BoundedRangeModel model = (BoundedRangeModel) progressThreadLocal.get();
        if (model != null) {
            long val = PROGRESS_MAX*(value - startOffset)/(endOffset - startOffset);
            setValue(model, (int)val);
        }
    }

    static void progressFinish() {
        BoundedRangeModel model = (BoundedRangeModel) progressThreadLocal.get();
        if (model != null) {
            setValue(model, PROGRESS_MAX);
            progressThreadLocal.remove();
        }
    }

    private static void setValue(final BoundedRangeModel model, final int val) {
        if (SwingUtilities.isEventDispatchThread()) {
            model.setValue(val);
        } else {
            SwingUtilities.invokeLater(new Runnable() {
                public void run() { model.setValue(val); }
            });
        }
    }
}