/*
  ==============================================================================

   This file is part of the juce_core module of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission to use, copy, modify, and/or distribute this software for any purpose with
   or without fee is hereby granted, provided that the above copyright notice and this
   permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
   TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
   NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
   DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
   IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ------------------------------------------------------------------------------

   NOTE! This permissive ISC license applies ONLY to files within the juce_core module!
   All other JUCE modules are covered by a dual GPL/commercial license, so if you are
   using any other modules, be sure to check that you also comply with their license.

   For more details, visit www.juce.com

  ==============================================================================
*/

void Logger::outputDebugString (const String& text)
{
    std::cerr << text << std::endl;
}

//==============================================================================
SystemStats::OperatingSystemType SystemStats::getOperatingSystemType()
{
    return Linux;
}

String SystemStats::getOperatingSystemName()
{
    return "Linux";
}

bool SystemStats::isOperatingSystem64Bit()
{
   #if JUCE_64BIT
    return true;
   #else
    //xxx not sure how to find this out?..
    return false;
   #endif
}

//==============================================================================
namespace LinuxStatsHelpers
{
    String getConfigFileValue (const char* file, const char* const key)
    {
        StringArray lines;
        File (file).readLines (lines);

        for (int i = lines.size(); --i >= 0;) // (NB - it's important that this runs in reverse order)
            if (lines[i].upToFirstOccurrenceOf (":", false, false).trim().equalsIgnoreCase (key))
                return lines[i].fromFirstOccurrenceOf (":", false, false).trim();

        return String();
    }

    String getCpuInfo (const char* key)
    {
        return getConfigFileValue ("/proc/cpuinfo", key);
    }
}

String SystemStats::getDeviceDescription()
{
    return LinuxStatsHelpers::getCpuInfo ("Hardware");
}

String SystemStats::getCpuVendor()
{
    String v (LinuxStatsHelpers::getCpuInfo ("vendor_id"));

    if (v.isEmpty())
        v = LinuxStatsHelpers::getCpuInfo ("model name");

    return v;
}

int SystemStats::getCpuSpeedInMegaherz()
{
    return roundToInt (LinuxStatsHelpers::getCpuInfo ("cpu MHz").getFloatValue());
}

int SystemStats::getMemorySizeInMegabytes()
{
    struct sysinfo sysi;

    if (sysinfo (&sysi) == 0)
        return (int) (sysi.totalram * sysi.mem_unit / (1024 * 1024));

    return 0;
}

int SystemStats::getPageSize()
{
    return (int) sysconf (_SC_PAGESIZE);
}

//==============================================================================
String SystemStats::getLogonName()
{
    if (const char* user = getenv ("USER"))
        return CharPointer_UTF8 (user);

    if (struct passwd* const pw = getpwuid (getuid()))
        return CharPointer_UTF8 (pw->pw_name);

    return String();
}

String SystemStats::getFullUserName()
{
    return getLogonName();
}

String SystemStats::getComputerName()
{
    char name [256] = { 0 };
    if (gethostname (name, sizeof (name) - 1) == 0)
        return name;

    return String();
}

static String getLocaleValue (nl_item key)
{
    const char* oldLocale = ::setlocale (LC_ALL, "");
    String result (String::fromUTF8 (nl_langinfo (key)));
    ::setlocale (LC_ALL, oldLocale);
    return result;
}

String SystemStats::getUserLanguage()    { return getLocaleValue (_NL_IDENTIFICATION_LANGUAGE); }
String SystemStats::getUserRegion()      { return getLocaleValue (_NL_IDENTIFICATION_TERRITORY); }
String SystemStats::getDisplayLanguage() { return getUserLanguage() + "-" + getUserRegion(); }

//==============================================================================
void CPUInformation::initialise() noexcept
{
    const String flags (LinuxStatsHelpers::getCpuInfo ("flags"));
    hasMMX   = flags.contains ("mmx");
    hasSSE   = flags.contains ("sse");
    hasSSE2  = flags.contains ("sse2");
    hasSSE3  = flags.contains ("sse3");
    has3DNow = flags.contains ("3dnow");
    hasSSSE3 = flags.contains ("ssse3");
    hasAVX   = flags.contains ("avx");

    numCpus = LinuxStatsHelpers::getCpuInfo ("processor").getIntValue() + 1;
}

//==============================================================================
uint32 juce_millisecondsSinceStartup() noexcept
{
    timespec t;
    clock_gettime (CLOCK_MONOTONIC, &t);

    return (uint32) (t.tv_sec * 1000 + t.tv_nsec / 1000000);
}

int64 Time::getHighResolutionTicks() noexcept
{
    timespec t;
    clock_gettime (CLOCK_MONOTONIC, &t);

    return (t.tv_sec * (int64) 1000000) + (t.tv_nsec / 1000);
}

int64 Time::getHighResolutionTicksPerSecond() noexcept
{
    return 1000000;  // (microseconds)
}

double Time::getMillisecondCounterHiRes() noexcept
{
    return getHighResolutionTicks() * 0.001;
}

bool Time::setSystemTimeToThisTime() const
{
    timeval t;
    t.tv_sec = millisSinceEpoch / 1000;
    t.tv_usec = (millisSinceEpoch - t.tv_sec * 1000) * 1000;

    return settimeofday (&t, 0) == 0;
}

JUCE_API bool JUCE_CALLTYPE juce_isRunningUnderDebugger()
{
   #if JUCE_BSD
    return false;
   #else
    return LinuxStatsHelpers::getConfigFileValue ("/proc/self/status", "TracerPid")
             .getIntValue() > 0;
   #endif
}
