#include "cpu.h"
#include "common/sysctl.h"
#include "util/apple/smc_temps.h"
#include "util/stringUtils.h"

static double detectCpuTemp(const FFstrbuf* cpuName)
{
    double result = 0;

    const char* error = NULL;
    if (ffStrbufStartsWithS(cpuName, "Apple M"))
    {
        switch (strtol(cpuName->chars + strlen("Apple M"), NULL, 10))
        {
            case 1: error = ffDetectSmcTemps(FF_TEMP_CPU_M1X, &result); break;
            case 2: error = ffDetectSmcTemps(FF_TEMP_CPU_M2X, &result); break;
            case 3: error = ffDetectSmcTemps(FF_TEMP_CPU_M3X, &result); break;
            case 4: error = ffDetectSmcTemps(FF_TEMP_CPU_M4X, &result); break;
            default: error = "Unsupported Apple Silicon CPU";
        }
    }
    else // PPC?
        error = ffDetectSmcTemps(FF_TEMP_CPU_X64, &result);

    if(error)
        return FF_CPU_TEMP_UNSET;

    return result;
}

#ifdef __aarch64__
#include "util/apple/cf_helpers.h"

#include <IOKit/IOKitLib.h>

static const char* detectFrequency(FFCPUResult* cpu)
{
    // https://github.com/giampaolo/psutil/pull/2222/files

    FF_IOOBJECT_AUTO_RELEASE io_registry_entry_t entryDevice = IOServiceGetMatchingService(MACH_PORT_NULL, IOServiceNameMatching("pmgr"));
    if (!entryDevice)
        return "IOServiceGetMatchingServices() failed";

    if (!IOObjectConformsTo(entryDevice, "AppleARMIODevice"))
        return "\"pmgr\" should conform to \"AppleARMIODevice\"";

    FF_CFTYPE_AUTO_RELEASE CFDataRef freqProperty = (CFDataRef) IORegistryEntryCreateCFProperty(entryDevice, CFSTR("voltage-states5-sram"), kCFAllocatorDefault, kNilOptions);
    if (!freqProperty || CFGetTypeID(freqProperty) != CFDataGetTypeID())
        return "\"voltage-states5-sram\" in \"pmgr\" is not found";

    // voltage-states5-sram stores supported <frequency / voltage> pairs of pcores from the lowest to the highest
    // voltage-states1-sram stores ecores'
    CFIndex propLength = CFDataGetLength(freqProperty);
    if (propLength == 0 || propLength % (CFIndex) sizeof(uint32_t) * 2 != 0)
        return "Invalid \"voltage-states5-sram\" length";

    uint32_t* pStart = (uint32_t*) CFDataGetBytePtr(freqProperty);
    uint32_t pMax = *pStart;
    for (CFIndex i = 2; i < propLength / (CFIndex) sizeof(uint32_t) && pStart[i] > 0; i += 2 /* skip voltage */)
        pMax = pMax > pStart[i] ? pMax : pStart[i];

    if (pMax > 0)
    {
        if (pMax > 100000000) // Assume that pMax is in Hz, M1~M3
            cpu->frequencyMax = pMax / 1000 / 1000;
        else // Assume that pMax is in kHz, M4 and later (#1394)
            cpu->frequencyMax = pMax / 1000;
    }

    return NULL;
}
#else
static const char* detectFrequency(FFCPUResult* cpu)
{
    cpu->frequencyBase = (uint32_t) (ffSysctlGetInt64("hw.cpufrequency", 0) / 1000 / 1000);
    cpu->frequencyMax = (uint32_t) (ffSysctlGetInt64("hw.cpufrequency_max", 0) / 1000 / 1000);
    if(cpu->frequencyBase == 0)
    {
        unsigned current = 0;
        size_t size = sizeof(current);
        if (sysctl((int[]){ CTL_HW, HW_CPU_FREQ }, 2, &current, &size, NULL, 0) == 0)
            cpu->frequencyBase = (uint32_t) (current / 1000 / 1000);
    }
    return NULL;
}
#endif

static const char* detectCoreCount(FFCPUResult* cpu)
{
    uint32_t nPerfLevels = (uint32_t) ffSysctlGetInt("hw.nperflevels", 0);
    if (nPerfLevels <= 0) return "sysctl(hw.nperflevels) failed";

    char sysctlKey[] = "hw.perflevelN.logicalcpu";
    if (nPerfLevels > ARRAY_SIZE(cpu->coreTypes))
        nPerfLevels = ARRAY_SIZE(cpu->coreTypes);
    for (uint32_t i = 0; i < nPerfLevels; ++i)
    {
        sysctlKey[strlen("hw.perflevel")] = (char) ('0' + i);
        cpu->coreTypes[i] = (FFCPUCore) {
            .freq = nPerfLevels - i,
            .count = (uint32_t) ffSysctlGetInt(sysctlKey, 0),
        };
    }
    return NULL;
}

const char* ffDetectCPUImpl(const FFCPUOptions* options, FFCPUResult* cpu)
{
    if (ffSysctlGetString("machdep.cpu.brand_string", &cpu->name) != NULL)
        return "sysctlbyname(machdep.cpu.brand_string) failed";

    ffSysctlGetString("machdep.cpu.vendor", &cpu->vendor);
    cpu->packages = (uint16_t) ffSysctlGetInt("hw.packages", 1);
    if (cpu->vendor.length == 0 && ffStrbufStartsWithS(&cpu->name, "Apple "))
        ffStrbufAppendS(&cpu->vendor, "Apple");

    cpu->coresPhysical = (uint16_t) ffSysctlGetInt("hw.physicalcpu_max", 1);
    if(cpu->coresPhysical == 1)
        cpu->coresPhysical = (uint16_t) ffSysctlGetInt("hw.physicalcpu", 1);

    cpu->coresLogical = (uint16_t) ffSysctlGetInt("hw.logicalcpu_max", 1);
    if(cpu->coresLogical == 1)
        cpu->coresLogical = (uint16_t) ffSysctlGetInt("hw.ncpu", 1);

    cpu->coresOnline = (uint16_t) ffSysctlGetInt("hw.logicalcpu", 1);
    if(cpu->coresOnline == 1)
        cpu->coresOnline = (uint16_t) ffSysctlGetInt("hw.activecpu", 1);

    detectFrequency(cpu);
    if (options->showPeCoreCount) detectCoreCount(cpu);

    cpu->temperature = options->temp ? detectCpuTemp(&cpu->name) : FF_CPU_TEMP_UNSET;

    return NULL;
}