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

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

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

namespace juce
{

//==============================================================================
namespace AndroidStatsHelpers
{
    #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
     STATICMETHOD (getProperty, "getProperty", "(Ljava/lang/String;)Ljava/lang/String;")

    DECLARE_JNI_CLASS (SystemClass, "java/lang/System")
    #undef JNI_CLASS_MEMBERS

    #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
     STATICMETHOD (getDefault, "getDefault", "()Ljava/util/Locale;") \
     METHOD (getCountry, "getCountry", "()Ljava/lang/String;") \
     METHOD (getLanguage, "getLanguage", "()Ljava/lang/String;")

    DECLARE_JNI_CLASS (JavaLocale, "java/util/Locale")
    #undef JNI_CLASS_MEMBERS

    static String getSystemProperty (const String& name)
    {
        return juceString (LocalRef<jstring> ((jstring) getEnv()->CallStaticObjectMethod (SystemClass,
                                                                                          SystemClass.getProperty,
                                                                                          javaString (name).get())));
    }

    static String getAndroidID()
    {
        auto* env = getEnv();

        if (LocalRef<jclass> settings { env->FindClass ("android/provider/Settings$Secure") })
        {
            if (auto fId = env->GetStaticFieldID (settings, "ANDROID_ID", "Ljava/lang/String;"))
            {
                auto androidID = (jstring) env->GetStaticObjectField (settings, fId);
                return juceString (LocalRef<jstring> (androidID));
            }
        }

        return "";
    }

    static String getLocaleValue (bool isRegion)
    {
        auto* env = getEnv();
        LocalRef<jobject> locale (env->CallStaticObjectMethod (JavaLocale, JavaLocale.getDefault));

        auto stringResult = isRegion ? env->CallObjectMethod (locale.get(), JavaLocale.getCountry)
                                     : env->CallObjectMethod (locale.get(), JavaLocale.getLanguage);

        return juceString (LocalRef<jstring> ((jstring) stringResult));
    }

    static String getAndroidOsBuildValue (const char* fieldName)
    {
        return juceString (LocalRef<jstring> ((jstring) getEnv()->GetStaticObjectField (
                            AndroidBuild, getEnv()->GetStaticFieldID (AndroidBuild, fieldName, "Ljava/lang/String;"))));
    }
}

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

String SystemStats::getOperatingSystemName()
{
    return "Android " + AndroidStatsHelpers::getSystemProperty ("os.version");
}

String SystemStats::getDeviceDescription()
{
    return AndroidStatsHelpers::getAndroidOsBuildValue ("MODEL")
            + "-" + AndroidStatsHelpers::getAndroidOsBuildValue ("SERIAL");
}

String SystemStats::getDeviceManufacturer()
{
    return AndroidStatsHelpers::getAndroidOsBuildValue ("MANUFACTURER");
}

bool SystemStats::isOperatingSystem64Bit()
{
   #if JUCE_64BIT
    return true;
   #else
    return false;
   #endif
}

String SystemStats::getCpuVendor()
{
    return AndroidStatsHelpers::getSystemProperty ("os.arch");
}

String SystemStats::getCpuModel()
{
    return readPosixConfigFileValue ("/proc/cpuinfo", "Hardware");
}

int SystemStats::getCpuSpeedInMegahertz()
{
    int maxFreqKHz = 0;

    for (int i = 0; i < getNumCpus(); ++i)
    {
        int freqKHz = File ("/sys/devices/system/cpu/cpu" + String (i) + "/cpufreq/cpuinfo_max_freq")
                        .loadFileAsString()
                        .getIntValue();

        maxFreqKHz = jmax (freqKHz, maxFreqKHz);
    }

    return maxFreqKHz / 1000;
}

int SystemStats::getMemorySizeInMegabytes()
{
   #if __ANDROID_API__ >= 9
    struct sysinfo sysi;

    if (sysinfo (&sysi) == 0)
        return static_cast<int> ((sysi.totalram * sysi.mem_unit) / (1024 * 1024));
   #endif

    return 0;
}

int SystemStats::getPageSize()
{
    return static_cast<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 SystemStats::getFullUserName()
{
    return getLogonName();
}

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

    return {};
}


String SystemStats::getUserLanguage()    { return AndroidStatsHelpers::getLocaleValue (false); }
String SystemStats::getUserRegion()      { return AndroidStatsHelpers::getLocaleValue (true); }
String SystemStats::getDisplayLanguage() { return getUserLanguage() + "-" + getUserRegion(); }

String SystemStats::getUniqueDeviceID()
{
    auto id = String ((uint64_t) AndroidStatsHelpers::getAndroidID().hashCode64());

    // Please tell someone at JUCE if this occurs
    jassert (id.isNotEmpty());
    return id;
}

//==============================================================================
void CPUInformation::initialise() noexcept
{
    numPhysicalCPUs = numLogicalCPUs = jmax ((int) 1, (int) android_getCpuCount());

    auto cpuFamily   = android_getCpuFamily();
    auto cpuFeatures = android_getCpuFeatures();

    if (cpuFamily == ANDROID_CPU_FAMILY_X86 || cpuFamily == ANDROID_CPU_FAMILY_X86_64)
    {
        hasMMX = hasSSE = hasSSE2 = (cpuFamily == ANDROID_CPU_FAMILY_X86_64);

        hasSSSE3 = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_SSSE3)  != 0);
        hasSSE41 = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_SSE4_1) != 0);
        hasSSE42 = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_SSE4_2) != 0);
        hasAVX   = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_AVX)    != 0);
        hasAVX2  = ((cpuFeatures & ANDROID_CPU_X86_FEATURE_AVX2)   != 0);

        // Google does not distinguish between MMX, SSE, SSE2, SSE3 and SSSE3. So
        // I assume (and quick Google searches seem to confirm this) that there are
        // only devices out there that either support all of this or none of this.
        if (hasSSSE3)
            hasMMX = hasSSE = hasSSE2 = hasSSE3 = true;
    }
    else if (cpuFamily == ANDROID_CPU_FAMILY_ARM)
    {
        hasNeon = ((cpuFeatures & ANDROID_CPU_ARM_FEATURE_NEON) != 0);
    }
    else if (cpuFamily == ANDROID_CPU_FAMILY_ARM64)
    {
        // all arm 64-bit cpus have neon
        hasNeon = true;
    }
}

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

    return static_cast<uint32> (t.tv_sec) * 1'000U + static_cast<uint32> (t.tv_nsec) / 1'000'000U;
}

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

    return (t.tv_sec * (int64) 1'000'000) + (t.tv_nsec / 1'000);
}

int64 Time::getHighResolutionTicksPerSecond() noexcept
{
    return 1'000'000;  // (microseconds)
}

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

bool Time::setSystemTimeToThisTime() const
{
    jassertfalse;
    return false;
}

} // namespace juce
