//  boost timer_test.cpp  --------------------------------------------------------------//

//  Copyright Beman Dawes 2006, 2011

//  Distributed under the Boost Software License, Version 1.0.
//  See  http://www.boost.org/LICENSE_1_0.txt

//  See http://www.boost.org/libs/timer for documentation.

#include <boost/timer/timer.hpp>
#include <boost/detail/lightweight_main.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <cstdlib> // for atol()
#include <iostream>
#include <string>
#include <ctime>

using std::string;
using std::cout;
using std::endl;
using boost::timer::default_places;
using boost::timer::nanosecond_type;
using boost::timer::cpu_times;
using boost::timer::format;
using boost::timer::cpu_timer;
using boost::timer::auto_cpu_timer;

namespace
{
  void unit_test()
  {
    cout << "unit test..." << endl;

    string default_format(" %ws wall, %us user + %ss system = %ts CPU (%p%)\n");

    // each constructor
    auto_cpu_timer t1;
    BOOST_TEST(!t1.is_stopped());
    //  the following, and similar below, are giving false failures on MinGW/gcc
    //  so comment them out for now
    //BOOST_TEST(&t1.ostream() == &cout);
    BOOST_TEST_EQ(t1.places(), default_places);
    BOOST_TEST_EQ(t1.format_string(), default_format);
    t1.stop();
    BOOST_TEST(t1.is_stopped());
    auto_cpu_timer t1a(t1);
    BOOST_TEST(t1a.is_stopped());
    BOOST_TEST_EQ(t1a.elapsed().wall, t1.elapsed().wall);
    BOOST_TEST_EQ(t1a.elapsed().user, t1.elapsed().user);
    BOOST_TEST_EQ(t1a.elapsed().system, t1.elapsed().system);
    //BOOST_TEST(&t1a.ostream() == &cout);
    BOOST_TEST_EQ(t1a.places(), default_places);
    BOOST_TEST_EQ(t1a.format_string(), default_format);
 
    auto_cpu_timer t1b;
    BOOST_TEST(!t1b.is_stopped());
    t1b = t1;
    BOOST_TEST(t1b.is_stopped());
    BOOST_TEST_EQ(t1b.elapsed().wall, t1.elapsed().wall);
    BOOST_TEST_EQ(t1b.elapsed().user, t1.elapsed().user);
    BOOST_TEST_EQ(t1b.elapsed().system, t1.elapsed().system);
    //BOOST_TEST(&t1b.ostream() == &cout);
    BOOST_TEST_EQ(t1b.places(), default_places);
    BOOST_TEST_EQ(t1b.format_string(), default_format);

    auto_cpu_timer t2(1);
    BOOST_TEST(!t2.is_stopped());
    //BOOST_TEST(&t2.ostream() == &cout);
    BOOST_TEST_EQ(t2.places(), 1);
    BOOST_TEST_EQ(t2.format_string(), default_format);

    auto_cpu_timer t3("foo");
    BOOST_TEST(!t3.is_stopped());
    //BOOST_TEST(&t3.ostream() == &cout);
    BOOST_TEST_EQ(t3.places(), default_places);
    BOOST_TEST_EQ(t3.format_string(), string("foo"));

    auto_cpu_timer t4(1, "foo");
    BOOST_TEST(!t4.is_stopped());
    //BOOST_TEST(&t4.ostream() == &cout);
    BOOST_TEST_EQ(t4.places(), 1);
    BOOST_TEST_EQ(t4.format_string(), string("foo"));

    auto_cpu_timer t5(std::cerr);
    BOOST_TEST(!t5.is_stopped());
    BOOST_TEST(&t5.ostream() == &std::cerr);
    BOOST_TEST_EQ(t5.places(), default_places);
    BOOST_TEST_EQ(t5.format_string(), default_format);

    auto_cpu_timer t6(std::cerr, 1);
    BOOST_TEST(!t6.is_stopped());
    BOOST_TEST(&t6.ostream() == &std::cerr);
    BOOST_TEST_EQ(t6.places(), 1);
    BOOST_TEST_EQ(t6.format_string(), default_format);

    auto_cpu_timer t7(std::cerr, "foo");
    BOOST_TEST(!t7.is_stopped());
    BOOST_TEST(&t7.ostream() == &std::cerr);
    BOOST_TEST_EQ(t7.places(), default_places);
    BOOST_TEST_EQ(t7.format_string(), string("foo"));

    auto_cpu_timer t8(std::cerr, 1, "foo");
    BOOST_TEST(!t8.is_stopped());
    BOOST_TEST(&t8.ostream() == &std::cerr);
    BOOST_TEST_EQ(t8.places(), 1);
    BOOST_TEST_EQ(t8.format_string(), string("foo"));

    t1.stop();
    t1a.stop();
    t1b.stop();
    t2.stop();
    t3.stop();
    t4.stop();
    t5.stop();
    t6.stop();
    t7.stop();
    t8.stop();

    cout << "  unit test complete" << endl;
  }

  void format_test()
  {
    cout << "format test..." << endl;

    cpu_times times;
    times.wall = 5123456789LL;
    times.user = 2123456789LL;
    times.system = 1234567890LL;

    cout << "  times.wall is   " << times.wall << '\n';
    cout << "  times.user is   " << times.user << '\n';
    cout << "  times.system is " << times.system << '\n';
    cout << "  user+system is  " << times.user + times.system << '\n';
    cout << "  format(times, 9) output: " << format(times, 9);

    BOOST_TEST_EQ(format(times, 9),
      string(" 5.123456789s wall, 2.123456789s user + 1.234567890s system = 3.358024679s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 8),
      string(" 5.12345679s wall, 2.12345679s user + 1.23456789s system = 3.35802468s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 7),
      string(" 5.1234568s wall, 2.1234568s user + 1.2345679s system = 3.3580247s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 6),
      string(" 5.123457s wall, 2.123457s user + 1.234568s system = 3.358025s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 5),
      string(" 5.12346s wall, 2.12346s user + 1.23457s system = 3.35802s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 4),
      string(" 5.1235s wall, 2.1235s user + 1.2346s system = 3.3580s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 3),
      string(" 5.123s wall, 2.123s user + 1.235s system = 3.358s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 2),
      string(" 5.12s wall, 2.12s user + 1.23s system = 3.36s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 1),
      string(" 5.1s wall, 2.1s user + 1.2s system = 3.4s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 0),
      string(" 5s wall, 2s user + 1s system = 3s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, 10),
      string(" 5.123456789s wall, 2.123456789s user + 1.234567890s system = 3.358024679s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times, -1),
      string(" 5.123457s wall, 2.123457s user + 1.234568s system = 3.358025s CPU (65.5%)\n"));
    BOOST_TEST_EQ(format(times),
      string(" 5.123457s wall, 2.123457s user + 1.234568s system = 3.358025s CPU (65.5%)\n"));

    BOOST_TEST_EQ(format(times, 5, " %w, %u, %s, %t, %%p%"),
      string(" 5.12346, 2.12346, 1.23457, 3.35802, %65.5%"));

    BOOST_TEST_EQ(format(times, 5, "boo"), string("boo"));

    cout << "  format test complete" << endl; 
  }

  void std_c_consistency_test()
  {
    cout << "C library consistency test..." << endl;

    // This test is designed to account for C timer resolution and for the possibility
    // that another active process may take up a lot of time.

    cpu_timer t;    // calls start(), so ensures any cpu_timer dll loaded
    std::time(0);   // ensure any system dll's loaded

    std::time_t stop_time, start_time = std::time(0);

    // wait until the time() clock ticks
    while (std::time(0) == start_time) {}
    
    // start both timers
    start_time = std::time(0);
    t.start();

    // wait until the time() clock ticks again
    while (std::time(0) == start_time) {}

    // stop both timers
    stop_time = std::time(0);
    t.stop();

    cout << "     std::time() elapsed is " << (stop_time - start_time) * 1.0L << " seconds\n";
    cout << "  cpu_timer wall elapsed is " << t.elapsed().wall / 1000000000.0L << " seconds\n";
    cout << "  The two clocks whose elapsed time is compared by this test are started\n"
            "  and stopped one right after the other. If the operating system suspends\n"
            "  the process in the interim, the test may fail. Thus no single failure\n"
            "  of this test is meaningful.\n";

    //  These tests allow lots of fuzz to reduce false positives
    BOOST_TEST(t.elapsed().wall / 1000000000.0L > (stop_time - start_time) * 0.75L);
    BOOST_TEST(t.elapsed().wall / 1000000000.0L < (stop_time - start_time) * 1.25L);

    cout << "  C library consistency test complete" << endl; 
  }


}  // unnamed namespace

//--------------------------------------------------------------------------------------//

int cpp_main(int, char *[])
{
  cout << "----------  timer_test  ----------\n";

  unit_test();
  format_test();
  std_c_consistency_test();

  return ::boost::report_errors();
}

