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

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. 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.

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

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

namespace juce
{

String SystemStats::getJUCEVersion()
{
    // Some basic tests, to keep an eye on things and make sure these types work ok
    // on all platforms. Let me know if any of these assertions fail on your system!
    static_assert (sizeof (pointer_sized_int) == sizeof (void*), "Basic sanity test failed: please report!");
    static_assert (sizeof (int8) == 1,                           "Basic sanity test failed: please report!");
    static_assert (sizeof (uint8) == 1,                          "Basic sanity test failed: please report!");
    static_assert (sizeof (int16) == 2,                          "Basic sanity test failed: please report!");
    static_assert (sizeof (uint16) == 2,                         "Basic sanity test failed: please report!");
    static_assert (sizeof (int32) == 4,                          "Basic sanity test failed: please report!");
    static_assert (sizeof (uint32) == 4,                         "Basic sanity test failed: please report!");
    static_assert (sizeof (int64) == 8,                          "Basic sanity test failed: please report!");
    static_assert (sizeof (uint64) == 8,                         "Basic sanity test failed: please report!");

    return "JUCE v" JUCE_STRINGIFY(JUCE_MAJOR_VERSION)
                "." JUCE_STRINGIFY(JUCE_MINOR_VERSION)
                "." JUCE_STRINGIFY(JUCE_BUILDNUMBER);
}

#if JUCE_ANDROID && ! defined (JUCE_DISABLE_JUCE_VERSION_PRINTING)
 #define JUCE_DISABLE_JUCE_VERSION_PRINTING 1
#endif

#if JUCE_DEBUG && ! JUCE_DISABLE_JUCE_VERSION_PRINTING
 struct JuceVersionPrinter
 {
     JuceVersionPrinter()
     {
         DBG (SystemStats::getJUCEVersion());
     }
 };

 static JuceVersionPrinter juceVersionPrinter;
#endif

StringArray SystemStats::getDeviceIdentifiers()
{
    StringArray ids;

   #if JUCE_WINDOWS
    File f (File::getSpecialLocation (File::windowsSystemDirectory));
   #else
    File f ("~");
   #endif
    if (auto num = f.getFileIdentifier())
    {
        ids.add (String::toHexString ((int64) num));
    }
    else
    {
        Array<MACAddress> addresses;
        MACAddress::findAllAddresses (addresses);
        for (auto& address : addresses)
            ids.add (address.toString());
    }

    jassert (ids.size() > 0); // Failed to create any IDs!
    return ids;
}

//==============================================================================
struct CPUInformation
{
    CPUInformation() noexcept    { initialise(); }

    void initialise() noexcept;

    int numLogicalCPUs = 0, numPhysicalCPUs = 0;

    bool hasMMX = false, hasSSE = false, hasSSE2 = false, hasSSE3 = false,
         has3DNow = false, hasSSSE3 = false, hasSSE41 = false,
         hasSSE42 = false, hasAVX = false, hasAVX2 = false, hasNeon = false;
};

static const CPUInformation& getCPUInformation() noexcept
{
    static CPUInformation info;
    return info;
}

int SystemStats::getNumCpus() noexcept          { return getCPUInformation().numLogicalCPUs; }
int SystemStats::getNumPhysicalCpus() noexcept  { return getCPUInformation().numPhysicalCPUs; }
bool SystemStats::hasMMX() noexcept             { return getCPUInformation().hasMMX; }
bool SystemStats::has3DNow() noexcept           { return getCPUInformation().has3DNow; }
bool SystemStats::hasSSE() noexcept             { return getCPUInformation().hasSSE; }
bool SystemStats::hasSSE2() noexcept            { return getCPUInformation().hasSSE2; }
bool SystemStats::hasSSE3() noexcept            { return getCPUInformation().hasSSE3; }
bool SystemStats::hasSSSE3() noexcept           { return getCPUInformation().hasSSSE3; }
bool SystemStats::hasSSE41() noexcept           { return getCPUInformation().hasSSE41; }
bool SystemStats::hasSSE42() noexcept           { return getCPUInformation().hasSSE42; }
bool SystemStats::hasAVX() noexcept             { return getCPUInformation().hasAVX; }
bool SystemStats::hasAVX2() noexcept            { return getCPUInformation().hasAVX2; }
bool SystemStats::hasNeon() noexcept            { return getCPUInformation().hasNeon; }


//==============================================================================
String SystemStats::getStackBacktrace()
{
    String result;

   #if JUCE_ANDROID || JUCE_MINGW
    jassertfalse; // sorry, not implemented yet!

   #elif JUCE_WINDOWS
    HANDLE process = GetCurrentProcess();
    SymInitialize (process, nullptr, TRUE);

    void* stack[128];
    int frames = (int) CaptureStackBackTrace (0, numElementsInArray (stack), stack, nullptr);

    HeapBlock<SYMBOL_INFO> symbol;
    symbol.calloc (sizeof (SYMBOL_INFO) + 256, 1);
    symbol->MaxNameLen = 255;
    symbol->SizeOfStruct = sizeof (SYMBOL_INFO);

    for (int i = 0; i < frames; ++i)
    {
        DWORD64 displacement = 0;

        if (SymFromAddr (process, (DWORD64) stack[i], &displacement, symbol))
        {
            result << i << ": ";

            IMAGEHLP_MODULE64 moduleInfo;
            zerostruct (moduleInfo);
            moduleInfo.SizeOfStruct = sizeof (moduleInfo);

            if (::SymGetModuleInfo64 (process, symbol->ModBase, &moduleInfo))
                result << moduleInfo.ModuleName << ": ";

            result << symbol->Name << " + 0x" << String::toHexString ((int64) displacement) << newLine;
        }
    }

   #else
    void* stack[128];
    int frames = backtrace (stack, numElementsInArray (stack));
    char** frameStrings = backtrace_symbols (stack, frames);

    for (int i = 0; i < frames; ++i)
        result << frameStrings[i] << newLine;

    ::free (frameStrings);
   #endif

    return result;
}

//==============================================================================
static SystemStats::CrashHandlerFunction globalCrashHandler = nullptr;

#if JUCE_WINDOWS
static LONG WINAPI handleCrash (LPEXCEPTION_POINTERS ep)
{
    globalCrashHandler (ep);
    return EXCEPTION_EXECUTE_HANDLER;
}
#else
static void handleCrash (int signum)
{
    globalCrashHandler ((void*) (pointer_sized_int) signum);
    kill (getpid(), SIGKILL);
}

int juce_siginterrupt (int sig, int flag);
#endif

void SystemStats::setApplicationCrashHandler (CrashHandlerFunction handler)
{
    jassert (handler != nullptr); // This must be a valid function.
    globalCrashHandler = handler;

   #if JUCE_WINDOWS
    SetUnhandledExceptionFilter (handleCrash);
   #else
    const int signals[] = { SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGABRT, SIGSYS };

    for (int i = 0; i < numElementsInArray (signals); ++i)
    {
        ::signal (signals[i], handleCrash);
        juce_siginterrupt (signals[i], 1);
    }
   #endif
}

bool SystemStats::isRunningInAppExtensionSandbox() noexcept
{
   #if JUCE_MAC || JUCE_IOS
    static bool firstQuery = true;
    static bool isRunningInAppSandbox = false;

    if (firstQuery)
    {
        firstQuery = false;

        File bundle = File::getSpecialLocation (File::invokedExecutableFile).getParentDirectory();

       #if JUCE_MAC
        bundle = bundle.getParentDirectory().getParentDirectory();
       #endif

        if (bundle.isDirectory())
            isRunningInAppSandbox = (bundle.getFileExtension() == ".appex");
    }

    return isRunningInAppSandbox;
   #else
    return false;
   #endif
}

} // namespace juce