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package org.jruby.runtime.profile;

import java.io.PrintStream;
import java.util.Arrays;
import java.util.Comparator;

import org.jruby.util.collections.IntHashMap;
import org.jruby.util.collections.IntHashMap.Entry;

public class FlatProfilePrinter extends ProfilePrinter {
    
    private static final int SERIAL_OFFSET = 0;
    private static final int SELFTIME_OFFSET = 1;
    private static final int COUNT_OFFSET = 2;
    private static final int AGGREGATETIME_OFFSET = 3;
    
    public FlatProfilePrinter(ProfileData profileData) {
        super(profileData);
    }
    
    FlatProfilePrinter(ProfileData profileData, Invocation topInvocation) {
        super(profileData, topInvocation);
    }

    public void printHeader(PrintStream out) {
        out.printf("\n%s profile results:\n", getThreadName());
    }
    
    public void printProfile(PrintStream out, boolean first) {
        final Invocation topInvocation = getTopInvocation();
        out.printf("Total time: %s\n\n", nanoString(topInvocation.getDuration()));

        final IntHashMap<MethodData> methods = methodData(topInvocation);
        final long[][] tuples = new long[methods.size()][];
        
        int j = 0;
        for (Entry<MethodData> entry : methods.entrySet()) {
            final MethodData method = entry.getValue();
            tuples[j++] = new long[]{ entry.getKey(), method.selfTime(), method.totalCalls(), method.totalTime() };
        }

        Arrays.sort(tuples, new Comparator<long[]>() {
            public int compare(long[] o1, long[] o2) {
                long o1Val = o1[AGGREGATETIME_OFFSET];
                long o2Val = o2[AGGREGATETIME_OFFSET];
                return o2Val > o1Val ? 1 : (o2Val < o1Val ? -1 : 0);
            }
        });

        out.println("     total        self    children       calls  method");
        out.println("----------------------------------------------------------------");
        int lines = 0;
        for (long[] tuple : tuples) {
            if (tuple[AGGREGATETIME_OFFSET] == 0) {
                break; // if we start hitting zeros, bail out
            }
            int index = (int) tuple[SERIAL_OFFSET];
            if (index != 0) {
                lines++;
                String name = methodName(index);
                pad(out, 10, nanoString(tuple[AGGREGATETIME_OFFSET]));
                out.print("  ");
                pad(out, 10, nanoString(tuple[SELFTIME_OFFSET]));
                out.print("  ");
                pad(out, 10, nanoString(tuple[AGGREGATETIME_OFFSET] - tuple[SELFTIME_OFFSET]));
                out.print("  ");
                pad(out, 10, Long.toString(tuple[COUNT_OFFSET]));
                out.print("  ");
                out.println(name);
            }
            if (lines == 50) {
                break;
            }
        }
    }
}
