/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Rubber Band
    An audio time-stretching and pitch-shifting library.
    Copyright 2007-2008 Chris Cannam.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "Profiler.h"

#include <algorithm>
#include <set>
#include <string>
#include <map>

#include <cstdio>

namespace RubberBand {

#ifndef NO_TIMING

Profiler::ProfileMap
Profiler::m_profiles;

Profiler::WorstCallMap
Profiler::m_worstCalls;

void
Profiler::add(const char *id, float ms)
{
    ProfileMap::iterator pmi = m_profiles.find(id);
    if (pmi != m_profiles.end()) {
        ++pmi->second.first;
        pmi->second.second += ms;
    } else {
        m_profiles[id] = TimePair(1, ms);
    }

    WorstCallMap::iterator wci = m_worstCalls.find(id);
    if (wci != m_worstCalls.end()) {
        if (ms > wci->second) wci->second = ms;
    } else {
        m_worstCalls[id] = ms;
    }
}

void
Profiler::dump()
{
#ifdef PROFILE_CLOCKS
    fprintf(stderr, "Profiling points [CPU time]:\n");
#else
    fprintf(stderr, "Profiling points [Wall time]:\n");
#endif

    fprintf(stderr, "\nBy name:\n");

    typedef std::set<const char *, std::less<std::string> > StringSet;

    StringSet profileNames;
    for (ProfileMap::const_iterator i = m_profiles.begin();
         i != m_profiles.end(); ++i) {
        profileNames.insert(i->first);
    }

    for (StringSet::const_iterator i = profileNames.begin();
         i != profileNames.end(); ++i) {

        ProfileMap::const_iterator j = m_profiles.find(*i);
        if (j == m_profiles.end()) continue;

        const TimePair &pp(j->second);
        fprintf(stderr, "%s(%d):\n", *i, pp.first);
        fprintf(stderr, "\tReal: \t%f ms      \t[%f ms total]\n",
                (pp.second / pp.first),
                (pp.second));

        WorstCallMap::const_iterator k = m_worstCalls.find(*i);
        if (k == m_worstCalls.end()) continue;
        
        fprintf(stderr, "\tWorst:\t%f ms/call\n", k->second);
    }

    typedef std::multimap<float, const char *> TimeRMap;
    typedef std::multimap<int, const char *> IntRMap;
    TimeRMap totmap, avgmap, worstmap;
    IntRMap ncallmap;

    for (ProfileMap::const_iterator i = m_profiles.begin();
         i != m_profiles.end(); ++i) {
        totmap.insert(TimeRMap::value_type(i->second.second, i->first));
        avgmap.insert(TimeRMap::value_type(i->second.second /
                                           i->second.first, i->first));
        ncallmap.insert(IntRMap::value_type(i->second.first, i->first));
    }

    for (WorstCallMap::const_iterator i = m_worstCalls.begin();
         i != m_worstCalls.end(); ++i) {
        worstmap.insert(TimeRMap::value_type(i->second, i->first));
    }

    fprintf(stderr, "\nBy total:\n");
    for (TimeRMap::const_iterator i = totmap.end(); i != totmap.begin(); ) {
        --i;
        fprintf(stderr, "%-40s  %f ms\n", i->second, i->first);
    }

    fprintf(stderr, "\nBy average:\n");
    for (TimeRMap::const_iterator i = avgmap.end(); i != avgmap.begin(); ) {
        --i;
        fprintf(stderr, "%-40s  %f ms\n", i->second, i->first);
    }

    fprintf(stderr, "\nBy worst case:\n");
    for (TimeRMap::const_iterator i = worstmap.end(); i != worstmap.begin(); ) {
        --i;
        fprintf(stderr, "%-40s  %f ms\n", i->second, i->first);
    }

    fprintf(stderr, "\nBy number of calls:\n");
    for (IntRMap::const_iterator i = ncallmap.end(); i != ncallmap.begin(); ) {
        --i;
        fprintf(stderr, "%-40s  %d\n", i->second, i->first);
    }
}

Profiler::Profiler(const char* c) :
    m_c(c),
    m_ended(false)
{
#ifdef PROFILE_CLOCKS
    m_start = clock();
#else
    (void)gettimeofday(&m_start, 0);
#endif
}

Profiler::~Profiler()
{
    if (!m_ended) end();
}

void
Profiler::end()
{
#ifdef PROFILE_CLOCKS
    clock_t end = clock();
    clock_t elapsed = end - m_start;
    float ms = float((double(elapsed) / double(CLOCKS_PER_SEC)) * 1000.0);
#else
    struct timeval tv;
    (void)gettimeofday(&tv, 0);

    tv.tv_sec -= m_start.tv_sec;
    if (tv.tv_usec < m_start.tv_usec) {
        tv.tv_usec += 1000000;
        tv.tv_sec -= 1;
    }
    tv.tv_usec -= m_start.tv_usec;
    float ms = float((double(tv.tv_sec) + (double(tv.tv_usec) / 1000000.0)) * 1000.0);
#endif

    add(m_c, ms);

    m_ended = true;
}
 
#endif

}